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Gas Generation Mechanism in Li-Metal Batteries

Energy & Environmental Materials 2022年第1期5卷 327-336页

作者： Huajun Zhao Jun Wang Huaiyu Shao Kang Xu yonghong deng Guangdong-Hong Kong-Macao Joint Laboratory for Photonic-Thermal-Electrical Energy Materials and Devices Department of Materials Science and EngineeringAcademy for Advanced Interdisciplinary StudiesSouthern University of Science and TechnologyShenzhen 518055China Energy Storage Branch US Army Research LaboratoryAdelphi MD 20783USA Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials EngineeringUniversity of MacaoAvenida da UniversidadeTaipa Macao SAR China

Gas generation induced by parasitic reactions in lithium-metal batteries(LMB)has been regarded as one of the fundamental barriers to the reversibility of this battery chemistry,which occurs via the complex interplays among electrolytes,cathode,anode,and the decomposition species that travel across the *** this work,a novel in situ differential electrochemical mass spectrometry is constructed to differentiate the speciation and source of each gas product generated either during cycling or during storage in the presence of cathode chemistries of varying structure and nickel *** unambiguously excludes the trace moisture in electrolyte as the major source of hydrogen and convincingly identifies the layer-structured NCM cathode material as the source of instability that releases active oxygen from the lattice at high voltages when NCM experiences H2→H3 phase transition,which in turn reacts with carbonate solvents,producing both CO_(2)and proton at the cathode *** proton in solvated state travels across the cell and becomes the main source for hydrogen generated at the anode *** are proposed to account for these irreversible reactions,and two electrolyte additives based on phosphate structure are adopted to mitigate the gas generation based on the understanding of the above decomposition chemistries.

关键词： differential electrochemical mass spectrometry gas evolution lithium metal lithium nickel cobalt manganese oxide oxygen release

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Exploring porous zeolitic imidazolate frame work-8(ZIF-8)as an efficient filler for high-performance poly(ethyleneoxide)-based solid polymer electrolytes

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Nano Research 2020年第8期13卷 2259-2267页

作者： Zhiwen Lei Jinlai Shen Weide Zhang Qingrong Wang Jun Wang yonghong deng Chaoyang Wang Research Institute of Materials Science South China University of TechnologyGuangzhou510640China School of Chemistry and Chemical Engineering South China University of TechnologyGuangzhou510640China Department of Materials Science and Engineering Academy for Advanced Interdisciplinary StudiesGuangdong Provincial Key Laboratory of Energy Materials for Electric PowerShenzhen518055China

Nano Research volume 13,pages2259–2267(2020)Cite this article 277 Accesses 1 Altmetric Metrics details Abstract The incorporation of inorganic fillers into poly(ethyleneoxide)(PEO)-based solid polymer electrolytes(SPEs)is well known as a low-cost and effective method to improve their mechanical and electrochemical *** zeolitic imidazolate framework-8(ZIF-8)is firstly used as the filler for PEO-based SPEs in this *** to the introduction of ZIF-8,an ionic conductivity of 2.2×10^−5 S/cm(30℃)is achieved for the composite SPE,which is one order of magnitude higher than that of the pure ***-8 also accounts for the broader electrochemical stability window and lithium ion transference number(0.36 at 60℃)of the composite ***,the improved mechanism of ZIF-8 to the composite SPE is investigated by zeta potential and Fourier transform infrared spectrograph *** stability at the composite SPE/lithium interface is greatly *** LiFePO4||Li cells using the composite SPE exhibit high capacity and excellent cycling performance at 60℃,i.e.,85%capacity retention with 111 mA·h/g capacity retained after 350 cycles at 0.5 *** comparison,the cells using the pure PEO show fast capacity decay to 74 mA·h/g maintaining only 68 *** results indicate that the PEO-based SPEs with ZIF-8 are of great promise for the application in solid-state lithium metal batteries.

关键词： zeolitic imidazolate framework inorganic fillers solid polymer electrolytes poly(ethyleneoxide) solid-state lithium metal batteries

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A three-dimensional crosslinked chitosan sulfate network binder for high-performance Li-S batteries

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Journal of Energy Chemistry 2021年第5期30卷 171-178页

作者： Jianwen Feng Huan Yi Zhiwen Lei Jun Wang Hongbo Zeng yonghong deng Chaoyang Wang Research Institute of Materials Science South China University of TechnologyGuangzhou 510640GuangdongChina Department of Materials Science&Engineering Academy for Advanced Interdisciplinary StudiesGuangdong Provincial Key Laboratory of Energy Materials for Electric PowerSouthern University of Science and Technology(SUSTech)Shenzhen 518055GuangdongChina Department of Chemical and Materials Engineering University of AlbertaEdmontonAB T6G 1H9Canada

Poor cycling performance caused by the shuttle effect of polysulfides is the main obstacle in the development of advanced lithium-sulfur(Li-S)*** polymer binders with polar groups can effectively adsorb polysulfides chemically,thereby suppressing the shuttle ***,a robust three-dimensional crosslinked polymer network,which demonstrates excellent mechanical property and strong affinity for polysulfides,is prepared by the aldimine condensation and coordination *** crosslinked chitosan sulfate network(CCSN)significantly enhances the cycling performance and rate capability of the sulfur *** CCSN-based sulfur cathode exhibits a high initial discharge capacity of 824 m Ah g^(-1) with only 0.082%average capacity loss per cycle at 1 *** a high rate of 4 C,the cathode exhibits a high capacity retention of 84.8%after 300 ***,the CCSN-based sulfur cathode exhibits an excellent cycling performance at a high sulfur loading of 2.5 mg cm^(-2),which indicates the excellent mechanical strength and binding performance of the CCSN binder for high-energy density Li-S *** study demonstrates a viable approach for developing high-performance Li-S batteries for practical application.

关键词： Chitosan Crosslinked binder Polysulfide Lithium-sulfur battery

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Ionic Liquid Mediated Synthesis of Lath Shaped CuO Micro-Assembles as Extremely Stable Anode Material for Lithium-Ion Batteries

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Chinese Journal of Chemistry 2017年第8期35卷 1299-1304页

作者： Man Wang Ruguang Ma Ying Liu C.Y. Chung yonghong deng Zhouguang Lu Department of Materials Science and Engineering Southern University of Science and Technology Shenzhen Guangdong 518055 China State Key Laboratory of High Performance Ceramics and Superfine Microstrueture Shanghai Institute of Ceramics Chinese Academy of Sciences Shanghai 200050 China Department of Physics and Materials Science City University of Hong Kong 83 Tat Chee Avenue Kowloon Hong Kong China

A novel lath-shaped CuO microassemble consisting of well-crystalized ultrafine nanocrystals was prepared by an ionothermal method with the assistance of ionic liquids （ILs, 1-butyl-3-methylimidazolium tetrafluoroborate）. As anode material of lithium ion batteries, the ILs-CuO exhibits high specific capacity, durability and good rate per- formance, superior to bare CuO. At a high current density of 1000 mA·g^-1, after 100 cycles, ILs-CuO still retains a discharge capacity of 483.2 mAh·g^-1. The improved electrochemical performances could be ascribed to the unique microscale lath-shape CuO assembles composed of ultrafine nanostructure.

关键词： lithium ion batteries anode lath-shaped CuO micro-assembles ionic liquid

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2.5μm-Thick Ultrastrong Asymmetric Separator for Stable Lithium Metal Batteries

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Energy & Environmental Materials 2024年第6期7卷 106-117页

作者： Donghao Xie Zekun Wang Xin Ma Yuchen Feng Xiaomin Tang Qiao Gu yonghong deng Ping Gao Advanced Materials Thrust Interdisciplinary OfficeThe Hong Kong University of Science and TechnologyClear Water BayHong Kong999077 China Department of Chemical and Biological Engineering The Hong Kong University of Science and TechnologyClear Water BayHong Kong 999077China Advanced Materials Thrust Function HubThe Hong Kong University of Science and Technology(Guangzhou)Nansha DistrictGuangzhou 511453China Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhen 518055China

Lithium metal batteries(LMBs)are considered the ideal choice for high volumetric energy density lithium-ion batteries,but uncontrolled lithium deposition poses a significant challenge to the stability of such *** this paper,we introduce a 2.5μm-thick asymmetric and ultrastrong separator,which can induce tissue-like lithium *** asymmetric separator,denoted by utPE@Cu_(2)O,was prepared by selective synthesis of Cu_(2)O nanoparticles on one of the outer surfaces of a nanofibrous(diameter~10 nm)ultrastrong ultrahigh molecular weight polyethylene(UHMWPE)*** analysis shows that the lithium deposits have tissue-like morphology,resulting in the symmetric lithium cells assembled using utPE@Cu_(2)O with symmetric Cu_(2)O coating exhibiting stable performance for over 2000 h of *** work demonstrates the feasibility of a facile approach ultrathin separators for the deployment of lithium metal batteries,providing a pathway towards enhanced battery performance and safety.

关键词： in situ SEI lithium deposition regulation separator ultrastrong ultrathin

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Engineering optimization approach of nonaqueous electrolyte for sodium ion battery with long cycle life and safety

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Green Energy & Environment 2021年第2期6卷 212-219页

作者： Haiying Che Xinrong Yang Yan Yu Chaoliang Pan Hong Wang yonghong deng Linsen Li Zi-Feng Ma Shanghai Electrochemical Energy Devices Research Center Depurment of Chemical EngineeringShanghai Jiao Tong UniversitygShanghai200240China Zhejiang NaTRIUM Energy Co.Ltd. Shaoxing 312000China Shanghai Zjian Chemical Technology Co.Ltd Shanghai200241China Shenzhen CAPCHEM Technology Co.Ltd Shenzhen518027China

Electrolyte design strategies are closely related to the capacities, cycle life and safety of sodium–ion batteries. In this study, we aimed to optimize electrolyte with the focus on engineering aspects. The basic physicochemical properties including ionic conductivity, viscosity,wettability and thermochemical stability of the electrolytes using Na PF6 as the solute and the mixed solvent with different components of EMC,DMC or DEC in PC or EC were systematically measured. Ah pouch cell with NaNi_(1/3)Fe_(1/3)Mn_(1/3)O_(2)/hard carbon electrodes was used to evaluate the performance of the prepared electrolytes. By using the Inductive Coupled Plasma Emission Spectrometer(ICP), X-ray photoelectron spectroscopy(XPS), Thermogravimetric-differential scanning calorimetry(TG-DSC) and Accelerating Rate Calorimeter(ARC), we show that an optimized electrolyte can effectively promote the formation of a protective interfacial layer on two electrodes, which not only retards parasitic reactions between the electrodes and electrolyte but also suppresses dissolution of metal ions from the cathode. With an optimized electrolyte, a NaNi_(1/3)Fe_(1/3)Mn_(1/3)O_(2)/hard carbon cell can attain 56.16% capacity retention under the low temperature of -40℃, and can be able to retain 80%capacity retention after more than 2500 cycles while presenting excellent thermal safety.

关键词： Sodium–ion battery NaNi_(1/3)Fe_(1/3)Mn_(1/3)O_(2) Nonaqueous electrolyte Safety Engineering optimization

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Natural Cocoons Enabling Flexible and Stable Fabric Lithium–Sulfur Full Batteries

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Nano-Micro Letters 2021年第5期13卷 204-217页

作者： Yanan An Chao Luo Dahua Yao Shujing Wen Peitao Zheng Shangsen Chi Yu Yang Jian Chang yonghong deng Chaoyang Wang Research Institute of Materials Science South China University of TechnologyGuangzhou 510640China Department of Materials Science and Engineering Guangdong Provincial Key Laboratory of Energy Materials for Electric PowerSouthern University of Science and TechnologyShenzhen 518055China College of Materials and Energy Guangdong Laboratory for Lingnan Modern AgricultureSouth China Agricultural UniversityGuangzhou 510642China Academy for Advanced Interdisciplinary Studies Southern University of Science and TechnologyShenzhen 518055China

Lithium–sulfur batteries are highly appealing as highenergy power systems and hold great application prospects for flexible and wearable ***,the easy formation of lithium dendrites,shuttle effect of dissolved polysulfides,random deposition of insulating lithium sulfides,and poor mechanical flexibility of both electrodes seriously restrict the utilization of lithium and stabilities of lithium and sulfur for practical ***,we present a cooperative strategy employing silk fibroin/sericin to stabilize flexible lithium–sulfur full batteries by simultaneously inhibiting lithium dendrites,adsorbing liquid polysulfides,and anchoring solid lithium *** from the abundant nitrogen-and oxygen-containing functional groups,the carbonized fibroin fabric serves as a lithiophilic fabric host for stabilizing the lithium anode,while the carbonized fibroin fabric and the extracted sericin are used as sulfiphilic hosts and adhesive binders,respectively,for stabilizing the sulfur ***,the assembled Li–S full battery provided a high areal capacity(5.6 mAh cm−2),limited lithium excess(90%),a high volumetric energy density(457.2 Wh L^(−1)),high-capacity retention(99.8%per cycle),and remarkable bending capability(6000 flexing cycles at a small radius of 5 mm).

关键词： Lithium-sulfur batteries Flexible batteries Carbonized silk fabric Lithium dendrite Shuttle effect

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PtCoNi ternary intermetallic compounds anchored on Co,Ni and N co-doped mesoporous carbon:Synergetic effect between PtCoNi nanoparticles and doped mesoporous carbon promotes the catalytic activity

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Journal of Energy Chemistry 2023年第3期78卷 340-349,I0010页

作者： Chaozhong Li Weiyue Zhao Xueyi Lu Zhangsen Chen Bing Han Xiaorong Zhang Jiaxiang Chen Yijia Shao Junlang Huo Yuexiang Zhu yonghong deng Shuhui Sun Shijun Liao The Key Laboratory of Fuel Cell Technology of Guangdong Province&The Key Laboratory of New Energy Technology of Guangdong Universities School of Chemistry and Chemical EngineeringSouth China University of TechnologyGuangzhou 510641GuangdongChina School of Materials Sun Yat-sen UniversityShenzhen 518107GuangdongChina Centre énergie Matériaux et TélécommunicationsInstitute National de la Recherche ScientifiqueVarennesQuébec J3X 1P7Canada Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhen 518055GuangdongChina

Highly active and robust electrocatalysts are desired for proton exchange membrane fuel ***-based intermetallic compounds(IMCs) have been recognized as one of the most promising low-platinum catalysts for fuel cells(FCs).Herein,we report a high-performance IMCs by anchoring ordered PtCoNi ternary nanoparticles on the N,Co and Ni co-doped dodecahedral mesoporous carbon(DMC).While the introduced Co and Ni participate in the formation of PtCoNi IMCs,some of them are doped in the mesoporous carbon and coordinated by N to form Co-N_(y)/Ni-N_(z)dual active centers,which further enhances the electrocatalytic activity towards oxygen reduction ***,the addition of Ni results in a negative shift of the d-band center of Pt as compared to the Pt/DMC and Pt_(3)Co/DMC,making it easier to adsorb oxygen on the *** expected,our optimal sample Pt_(3)Co_(0.7)Ni_(0.3)/DMC exhibits excellent performance with mass activity and specific activity of 1.32 A mgPt-1and 1.98 mA cm^(-2)at 0.9 V,which are 7.33and 6.19 times that of commercial Pt/C,*** Pt_(3)Co_(0.7)Ni_(0.3)/DMC also reveals much better cathodic performance in an H2-air single fuel cell than commercial Pt/C catalyst with a power density of0.802 W cm^(-2).This work provides critical sights into constructing efficient catalysts by ternary intermetallic strategy and synergetic effect between active components and support.

关键词： Ternary intermetallic compounds Oxygen reduction reaction Fuel cell Catalyst

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Unique double-layer solid electrolyte interphase formed with fluorinated ether-based electrolytes for high-voltage lithium metal batteries

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Journal of Energy Chemistry 2024年第1期88卷 532-542,I0012页

作者： Ruo Wang Jiawei Li Bing Han Qingrong Wang Ruohong Ke Tong Zhang Xiaohu Ao Guangzhao Zhang Zhongbo Liu Yunxian Qian Fangfang Pan Iseult Lynch Jun Wang yonghong deng Department of Materials Science&Engineering School of Innovation and EntrepreneurshipSouthern University of Science and TechnologyShenzhen 518055GuangdongChina School of Geography Earth and Environmental SciencesUniversity of BirminghamEdgbastonBirmingham B152TTUK Key Laboratory of Marine Environmental Corrosion and Bio-Fouling Institute of OceanologyChinese Academy of SciencesQingdao 266071ShandongChina Shenzhen CAPCHEM Technology Co. Ltd.Shenzhen 518118GuangdongChina CALB Group Co. Ltd.Changzhou 213200JiangsuChina

Li metal batteries using high-voltage layered oxides cathodes are of particular interest due to their high energy ***,they suffer from short lifespan and extreme safety concerns,which are attributed to the degradation of layered oxides and the decomposition of electrolyte at high voltage,as well as the high reactivity of metallic *** key is the development of stable electrolytes against both highvoltage cathodes and Li with the formation of robust interphase films on the ***,we report a highly fluorinated ether,1,1,1-trifluoro-2-[(2,2,2-trifluoroethoxy)methoxy]ethane(TTME),as a cosolvent,which not only functions as a diluent forming a localized high concentration electrolyte(LHCE),but also participates in the construction of the inner solvation *** TTME-based electrolyte is stable itself at high voltage and induces the formation of a unique double-layer solid electrolyte interphase(SEI)film,which is embodied as one layer rich in crystalline structural components for enhanced mechanical strength and another amorphous layer with a higher concentration of organic components for enhanced *** Li||Cu cells display a noticeably high Coulombic efficiency of 99.28%after 300 cycles and Li symmetric cells maintain stable cycling more than 3200 h at 0.5 mA/cm^(2) and 1.0m Ah/cm^(2).In addition,lithium metal cells using LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2) and Li CoO_(2) cathodes(both loadings~3.0 m Ah/cm^(2))realize capacity retentions of>85%over 240 cycles with a charge cut-off voltage of 4.4 V and 90%for 170 cycles with a charge cut-off voltage of 4.5 V,*** study offers a bifunctional ether-based electrolyte solvent beneficial for high-voltage Li metal batteries.

关键词： Lithium metal batteries High-voltage layered oxides Fluorinated ether-based electrolytes Solid electrolyte interphase Cathode electrolyte interphase

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Alkali and alkaline ions co-substitution of P2 sodium layered oxides for sodium ion batteries

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Chinese Journal of Structural Chemistry 2023年第5期42卷 13-21页

作者： Yuncai Chen Maolin Yang Liangtao Yang Ziwei Chen Huiyun Li Haw Jiunn Woo Shang-Sen Chi Yinguo Xiao Jun Wang Chaoyang Wang yonghong deng Key University Laboratory of Highly Efficient Utilization of Solar Energy and Sustainable Development of Guangdong Department of Materials Science&EngineeringSchool of Innovation and EntrepreneurshipSouthern University of Science and TechnologyShenzhen518055China Centre for Ionics University Malaya Department of PhysicsFaculty of ScienceUniversity of MalayaKuala Lumpur50603Malaysia School of Advanced Materials Peking UniversityShenzhen Graduate SchoolShenzhen518055China Shenzhen Institutes of Advanced Technology Chinese Academy of SciencesShenzhen518055China Research Institute of Materials Science South China University of TechnologyGuangzhou510640China

Alkali and alkaline ion substitutions enhance the electrochemical properties of P2 sodium layered oxide,while the effect on electrochemical property enhancement of alkali and alkaline ions co-substitution is still *** this work,the structural and electrochemical properties of the Li alkali and Mg alkaline ions co-substituted P2 layered oxide Na_(0.67)(Li_(0.5)Mg_(0.5))_(0.1)(Ni_(0.33)Mn_(0.67))_(0.9)O_(2)are investigated in *** to the pristine and single-ion substituted materials,the co-substituted material shows an enhanced cycling performance with a reversible ca-pacity of 127 mAh/g and a capacity retention of 75%over 100 cycles at *** intermittent titration technique(GITT)and cyclic voltammetry(CV)results show that the Li and Mg synergistically improve the ion ***,the structure stability is also improved by the Li and Mg co-substitution that is clarified by operando X-ray diffraction(XRD)*** results explain the origin of the enhanced electrochemical properties of the Li/Mg co-substituted P2 layered oxides for sodium ion batteries.

关键词： Sodium ions batteries Sodium layered oxides Alkali and alkaline elements co-substitution Neutron diffraction Structural evolution

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