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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

长纤维增强丙烯腈-苯乙烯复合材料注塑成型与工艺优化

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塑料 2024年第5期53卷 124-129页

作者：姜跃平钱程邓勇宏殷小春广东美的制冷设备有限公司广东佛山528311 华南理工大学聚合物成型加工工程教育部重点实验室广东广州510640

以含量为30%的玻璃纤维(GF)增强聚丙烯腈-苯乙烯(AS)复合材料(GFAS)注塑成型为研究对象,选取塑化温度、注射速度、保压压力及模具温度为因子,以拉伸强度、弯曲强度及缺口冲击强度作为评价指标设计了正交实验。极差分析与方差分析的结果... 详细信息

以含量为30%的玻璃纤维(GF)增强聚丙烯腈-苯乙烯(AS)复合材料(GFAS)注塑成型为研究对象,选取塑化温度、注射速度、保压压力及模具温度为因子,以拉伸强度、弯曲强度及缺口冲击强度作为评价指标设计了正交实验。极差分析与方差分析的结果表明,注射速度对拉伸强度的影响最显著,保压压力显著影响材料的弯曲强度和缺口冲击强度。根据正交实验的分析结果进行了保压压力和注射速度的单因素实验,得到最佳的工艺参数组合为塑化温度为250℃、注射速度为50%、保压压力为75MPa与模具温度为65℃,此时,标准样条的拉伸强度为143.4MPa,弯曲强度为199.9MPa,缺口冲击强度为19.2kJ/m^(2),通过优化注塑工艺参数提高了复合材料(GFAS)的综合力学性能。

关键词：丙烯腈-苯乙烯共聚物长玻纤注塑工艺优化力学性能复合材料

Gas Generation Mechanism in Li-Metal Batteries

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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

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

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

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

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

锂离子电池硅基负极电解液添加剂研究进展:挑战与展望

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储能科学与技术 2024年第1期13卷 279-292页

作者：陈珊珊郑翔王若原铭蔓彭威鲁博明张光照王朝阳王军邓永红南方科技大学材料科学与工程系/创新创业学院广东深圳518055 中创新航科技集团股份有限公司江苏常州213200 华南理工大学材料科学研究所广东广州510640

随着新能源和动力系统应用的日益成熟,锂离子电池在未来必将发挥越来越重要的作用,高比能电池已经成为当前研究的热点,并不断提出更高的性能要求。具有超高理论能量密度的硅材料被认为是缓解电动汽车行业里程焦虑的新一代负极材料,预示... 详细信息

随着新能源和动力系统应用的日益成熟,锂离子电池在未来必将发挥越来越重要的作用,高比能电池已经成为当前研究的热点,并不断提出更高的性能要求。具有超高理论能量密度的硅材料被认为是缓解电动汽车行业里程焦虑的新一代负极材料,预示着未来几年将是硅基负极锂离子电池产业化应用的黄金时期。然而,硅在脱/嵌锂过程中会反复收缩膨胀(体积变化率约为300%),致使负极材料粉化、脱落,进而失去电接触,造成负极材料的失活;其次,循环过程中不断的体积变化会对其表面固体电解质界面层造成持续不断的破坏,因此难以形成稳定的固体电解质中间相(SEI)膜,这导致大量活性锂和电解液的消耗,最终导致容量快速衰减。本综述旨在从电解液添加剂在SEI形成和修饰、Lewis碱中和、溶剂化调控等作用机理角度对硅基负极界面恶化方面所面临的挑战进行分析,并重点介绍硅基负极电解液添加剂的最新成果。此外,通过对氟、硅烷、酰胺、氰酸酯等官能团构效关系方面的深入讨论和比较,本综述还深入研究了电解液添加剂的设计问题,以激发读者的新思路和新想法,协助读者识别或者设计合成适用于硅基负极的电解液添加剂,为高比能电池的发展铺平道路。

关键词：硅基负极电解液添加剂固体电解质中间相膜

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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