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Tailoring Mg^(2+)Solvation Structure in a Facile All-Inorganic[Mg_(x)Li_(y)Cl2_(x+y)·nTHF]Complex Electrolyte for High Rate and Long cycle-life Mg Battery

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Energy & Environmental Materials 2023年第2期6卷 152-158页

作者： Haiyan Fan Xinxin Zhang Yuxing Zhao Jianhua Xiao Hua Yuan Guang Wang Yitao Lin Jifang Zhang Ludi Pan Ting Pan Yang Liu Yuegang Zhang State Key Laboratory of Low-Dimensional Quantum Physics Department of PhysicsTsinghua UniversityBeijing 100084China

A high-performance all-inorganic magnesium-lithium chloride complex(MLCC)electrolyte is synthesized by a simple room-temperature reaction of LiCl with MgCl_(2) in tetrahydrofuran(THF)solvent.Molecular dynamics simulation,density functional theory calculation,Raman spectroscopy,and nuclear magnetic resonance spectroscopy reveal that the formation of[Mg_(x)Li_(y)Cl_(2x+y)·nTHF]complex solvation structure significantly lowers the coordination number of THF in the first solvation sheath of Mg^(2+),which significantly enhances its de-solvation kinetics.The MLCC electrolyte presents a stable electrochemical window up to 3.1 V(vs Mg/Mg^(2+))and enables reversible cycling of Mg metal deposition/stripping with an outstanding Coulombic efficiency up to 99%at current densities as high as 10 mA cm^(-2).Utilizing the MLCC electrolyte,a Mg/Mo_(6)S_(8) full cell can be cycled for over 10000 cycles with a superior capacity retention of 85 mA h g^(-1) under an ultrahigh rate of 50 C(1 C=128.8 mA g^(-1)).The facile synthesis of highperformance MLCC electrolyte provides a promising solution for future practical magnesium batteries.

关键词： cycle life electrolyte Mg battery solvation structure

Polydopamine-mediated synthesis of Si@carbon@graphene aerogels for enhanced lithium storage with long cycle life

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Chinese Chemical Letters 2021年第12期32卷 3787-3792页

作者： Ningning Li Yi Liu Xiaoyu Ji Jiaxin Feng Kai Wang Jiayue Xie Guanglu Lei Xianghong Liu Xiangxin Guo Jun Zhang College of Physics Qingdao UniversityQingdao 266071China Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) Nankai UniversityTianjin 300071China

The application of Si as the anode materials for lithium-ion batteries(LIBs) is still severely hindered by the rapid capacity decay due to the structural damage caused by large volume change(> 300%) during cycling. Herein, a three-dimensional(3 D) aerogel anode of Si@carbon@graphene(SCG) is rationally constructed via a polydopamine-assisted strategy. Polydopamine is coated on Si nanoparticles to serve as an interface linker to initiate the assembly of Si and graphene oxide, which plays a crucial role in the successful fabrication of SCG aerogels. After annealing the polydopamine is converted into N-doped carbon(N-carbon) coatings to protect Si materials. The dual protection from N-carbon and graphene aerogels synergistically improves the structural stability and electronic conductivity of Si, thereby leading to the significantly improved lithium storage properties. Electrochemical tests show that the SCG with optimized graphene content delivers a high capacity(712 m Ah/g at 100 m A/g) and robust cycling stability(402 m Ah/g at 1 A/g after 1500 cycles). Furthermore, the full cell using SCG aerogels as anode exhibits a reversible capacity of 187.6 m Ah/g after 80 cycles at 0.1 A/g. This work provides a plausible strategy for developing Si anode in LIBs.

关键词： Si anode Carbon coating Graphene Aerogel cycle life

Tailored architecture of composite electrolyte for all-solid-state sodium batteries with superior rate performance and cycle life

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Nano Research 2024年第5期17卷 4171-4180页

作者： Xiang Guan Zhenhua Jian Xingan Liao Wenchao Liao Yanfei Huang Dazhu Chen Robert K.Y.Li Chen Liu Shenzhen Key Laboratory of Polymer Science and Technology Guangdong Research Center for Interfacial Engineering of Functional MaterialsCollege of Materials Science and EngineeringShenzhen UniversityShenzhen 518055China Department of Materials Science and Engineering City University of Hong KongHong KongChina

Seeking for composite electrolytes reinforced all-solid-state sodium ion batteries with superior long lifespan and rate performance remains a great challenge.Here,a unique strategy to tailor the architecture of composite electrolyte via inserting polymer chains into a small quantity of sulfate sodium grafted C_(48)0H_(28)O_(32)Zr_(6)(UIOSNa)is proposed.The intimate contact between polymer segments and UIOSNa with limited pore size facilitates the anion immobilization of sodium salts and reduction of polymer crystallinity,thereby providing rapid ion conduction and reducing the adverse effect caused by the immigration of anions.The tNa+grafting of-SO_(3)Na groups on fillers allows the free movement of more sodium ions to further improve and ionic conductivity.Consequently,even with the low content of UIOSNa fillers,a high ionic conductivity of 6.62×10^(-4) S·cm^(-1) at 60℃ and a transference number of 0.67 for the special designed composite electrolyte are achieved.The assembled all-solid-state sodium cell exhibits a remarkable rate performance for 500 cycles with 95.96%capacity retention at a high current rate of 4 C.The corresponding pouch cell can stably work for 1000 cycles with 97.03%capacity retention at 1 C,which is superior to most of the reported composite electrolytes in the literature.

关键词： solid state sodium battery composite electrolyte rate performance cycle life

High energy density performance of hydrothermally produced hydrous ruthenium oxide/multiwalled carbon nanotubes composite: Design of an asymmetric supercapacitor with excellent cycle life

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Journal of Energy Chemistry 2016年第4期25卷 627-635页

作者： K.Chaitra P.Sivaraman R.T.Vinny Umananda M.Bhatta N.Nagaraju N.Kathyayini Department of Nanobiosciences Centre for Emerging TechnologiesJain Global CampusJain UniversityJakkasandra postKanakapura TalukRamanagara District Naval Materials Research Laboratory Department of Chemistry St.Joseph's College

Hydrous ruthenium oxide(h-Ru O) nanoparticles and its composite with multiwalled carbon nanotubes(h-Ru O/MWCNT) were synthesized by a simple hydrothermal method and proved to have potential application as hybrid supercapacitor material.The h-Ru Oand h-Ru O/MWCNT were characterized for their physico-chemical properties by PXRD,BET surface area,Raman,SEM-EDS and TEM techniques.The electrochemical performance of the materials were investigated,specific capacitance(Cs) of h-Ru Oand hRu O/MWCNT estimated by their cyclic voltammetric studies were found to be 604 and 1585 F/g respectively at a scan rate of 2 m V/s in the potential range 0–1.2 V.Further,this value was found to be nearly three times higher than that of pure h-Ru O.An asymmetric supercapacitor(AS) device was fabricated by employing h-Ru O/MWCNT as the positive electrode and activated carbon as the negative electrode.The device exhibited Cs of 61.8 F/g at a scan rate of 2 m V/s.Further,the device showed excellent long term stability for 20,000 cycles with 88% capacitance retention at a high current density of 25 A/g.

关键词： Carbon nanotubes Hybrid composites Asymmetric supercapacitors cycle life

Zr-doping stabilizes spinel LiMn_(2)O_(4)as a low cost long cycle life cathode for lithium ion batteries

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Chinese Physics B 2023年第5期32卷 554-559页

作者：张祥功吴伟周思思黄飞许诗浩尹良杨伟李泓 Wuhan Institute of Marine Electric Propulsion Wuhan 430064China Tianmu Lake Institute of Advanced Energy Storage Technologies Co. Ltd.Liyang 213300China Institute of Physics Chinese Academy of SciencesBeijing 100190China

The present commercial spinel LiMn_(2)O_(4) delivers only 90 m Ah/g–115 m Ah/g,far lower than the theoretical specific capacity.It degrades fast caused by the Jahn–Teller effect,Mn dissolution and related side reactions that consume Li inventory.In this work,Zr doping is employed to improve the structural stability and electrochemical performance of spinel LiMn_(2)O_(4).Li_(1.06)Mn_(1.94-x)Zr_xO_4(x=0,0.01,0.02,0.04)have been successfully synthesized by a simple solid-state reaction method and evaluated as cathode for lithium ion batteries(LIB).Li_(1.06)Mn_(1.92)Zr_(0.02)O_4 is superior cathode material with a high capacity of 122 m Ah/g at 1-C rate;long cycle stability,98.39%retention after 100 cycles at 1-C rate,excellent high rate performance 107.1 m Ah/g at 10-C rate,and high temperature performance 97.39%retention after 60 cycles.These are thought to be related to Zr doping effectively stabilizing the spinel LiMn_(2)O_(4),by forming stronger Zr–O bonds in the octahedron,suppressing the Jahn–Teller effect,thus improving electrochemical performance.

关键词： lithium battery cathode LiMn_(2)O_(4) cycle life

A Long cycle life Self-Healing Zinc-Iodine Flow Battery with High Power Density

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A Long Cycle Life Self-Healing Zinc-Iodine Flow Battery with...

Revealing the correlation between structural evolution and long-term cyclability of the LiNi_(0.5)Co_(0.2)Mn_(0.3)O_(2)/artificial graphite pouch cells at various rates

中国化学会第三届中国能源材料化学研讨会

作者： Congxin Xie Xianfeng Li Division of Energy Storage Dalian Institute of Chemical Physics Chinese Academy of Sciences University of Chinese Academy of Sciences

＜正＞Flow batteries are one of the most promising technology to realize the large-scale utilization of renewable energy due to the perfect combination of high safety,efficiency and long cycle life properties.Regarding as the cost and energy density,zinc iodine flow battery（ZIFB） achieved great attention owning to the high solubility and excellent electrochemical property.

关键词： flow batteries zinc-iodine power density self-healing cycle life

来源： cnki会议评论

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Particuology 2023年第10期81卷 162-173页

作者： Xu-Feng Zang Shengchen Yang Ying Zou Yingying Zhang Tao Huang Hui-Ling Xia School of Science Huzhou UniversityHuzhou313000China Department of Engineering Technology Huzhou CollegeHuzhou313000China Laboratory Management Department Huzhou UniversityHuzhou313000China

In recent years,researches on improving high-voltage performance of lithium-ion batteries incorporating LiNi_(0.5)Co_(0.2)Mn_(0.3)O_(2)(NCM523)and artificial graphite(AG)have been widely reported.However,limited attentions have been paid to understand the effects and influence mechanisms of charge and discharge rates and charge limit currents on cyclability of NCM523/AG cells.Herein,a∼1.9 Ah NCM523/AG pouch cell is employed,whose electrochemical and structural evolutions after 800 cycles at various rates are comprehensively investigated.We find that cycling performances are strongly influenced by charge rate,followed by limit current and discharge rate.The cell charged at a high rate and cell charged until reaching a low limit current both exhibit low capacity retentions compared to the cell discharged at a high rate.Possible failure reasons are analyzed by advanced characterizations.Results reveal that NCM523 cathodes of the cells deteriorated early experience severe transition metal dissolution,lattice distortion,and partial phase transformation.Meanwhile,the deposited transition metals on AG anodes catalyze the electrolyte consumption,lithium plating and active area loss.Finally,these side reactions notably increase cell impedance and electrochemical polarization.Undoubtedly,these findings clearly outline the challenges and optimization direction for high-rate NCM523/AG cells.

关键词： Lithium-ion batteries Artificial graphite LiNi_(0.5)Co_(0.2)Mn_(0.3)O_(2) cycle life Charge-dischargerate Failure mechanism

LiZr_(2)(PO_(4))_(3)surface coating towards stable layer structure Li_(1.2)Mn_(0.54)Ni_(0.13)Co_(0.13)O_(2)cathode materials with long cycle performance

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Nano Research 2023年第2期16卷 2373-2382页

作者： Hao Yang Jie Wang Changsheng Xu Kewei Wu Fangfang Zou Xuebu Hu Zhongli Hu College of Chemistry and Chemical Engineering Chongqing University of TechnologyChongqing 400054China

Li-rich manganese-based materials are considered to be the mainstream cathode materials for next-generation lithium-ion batteries due to high discharge capacity and low cost,but poor cycle life and high temperature performance limit their development.Herein,LiZr_(2)(PO_(4))_(3)(LZPO)is coated on the surface of spherical Li_(1.2)Mn_(0.54)Ni_(0.13)Co_(0.13)O_(2)(LMNCO)material by a simple wet chemical method.The LZPO layer not only has the function of traditional coating layer to inhibit the occurrence of side reactions between electrolyte and LMNCO surface but also promotes the formation of spinel phase in the layered structure,increases the content of lattice oxygen,and reduces the content of absorbed oxygen.Thus,LZPO coated LMNCO has a more stable layered structure during cycling compared pure LMNCO,which improves effectively its long life and high temperature performance.The capacity loss rate of LZPO coated LMNCO is only 16.2%and 11.9%after 350 cycles at 25℃and 200 cycles at 50℃,respectively.Moreover,the capacity retention rate of the full cell composed of LZPO coated LMNCO and graphite is 70.7%after 200 cycles at 1.0 C.The coating layer toward stable surface structure can provide an idea for the modification of cathode materials,especially for Li-rich manganese-based materials.

关键词： Li_(1.2)Mn_(0.54)Ni_(0.13)Co_(0.13)O_(2) LiZr_(2)(PO_(4))_(3) layered structure cycle life high temperature

Research and application of Ti-Mn-based hydrogen storage alloys

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Journal of Iron and Steel Research(International) 2023年第4期30卷 611-625页

作者： Yang-huan Zhang Chen Li Wei Zhang Xin Wei Jun Li Yan Qi Dong-liang Zhao Department of Functional Material Research Central Iron and Steel Research InstituteBeijing 100081China Collaborative Innovation Center of Integrated Exploitation of Bayan Obo Multi-Metal Resources Inner Mongolia University of Science and TechnologyBaotou 014010Inner MongoliaChina China Rare Earth New Material(Weishan)Co. Ltd.Jining 277600ShandongChina

Ti–Mn-based hydrogen storage alloys are considered to be one of the most promising hydrogen storage alloys for proton exchange membrane fuel cell applications,because of their good hydrogen absorption and desorption kinetics,low price,good activation performance,possession of high electrochemical capacity,and good cycling performance.The structure,performance characteristics,crystal structure of hydrides,development and application status of Ti–Mn-based hydrogen storage alloys were reviewed,and the methods to improve Ti–Mn-based hydrogen storage alloys were discussed:optimization of the preparation process,element substitution,and surface treatment.(1)In the study of the alloy preparation process,it was found that the use of the annealing process can significantly improve the high rate discharge performance,and cycling stability performance,increasing the maximum discharge capacity of the alloy electrode.In addition,using vacuum plasma spraying to prepare the electrode has better cycling stability and kinetic performance.(2)In element substitution,the effects of using Zr elements to partially replace Ti and Mn with Cr,V,Mo,and Fe on the hydrogen storage properties of Ti–Mn-based alloys were investigated.(3)In the study of surface treatment,palladium was plated on the surface of TiMn_(1.5) alloy by chemical deposition,and the strong affinity of palladium for hydrogen accelerated the cleavage of hydrogen molecules,which significantly improved the hydrogen absorption kinetics of TiMn_(1.5) alloy.Meanwhile,a new binary alloy system was formed by adding TiMn_(2) to MgH_(2),and it was shown that the addition of TiMn_(2) significantly improved the hydrogen absorption/desorption kinetics of the MgH_(2) alloy.Finally,the prospect of the application of Ti–Mn-based hydrogen storage alloys is presented,and the insight of further development of the alloy is offered.

关键词： Hydrogen storage Ti-Mn-based alloy Property characterization Modification treatment cycle life