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Restraining migration and dissolution of transition-metal-ions via functionalized separator for Li-rich Mn-based cathode with high-energy-density

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Journal of Energy Chemistry 2023年第9期84卷 11-21页

作者： Zhi Li Bao Zhang Gangyong Li Shuang Cao Changmeng Guo Heng Li Ruijuan Wang Jiarui Chen Lei Wu Jiajia Huang Yansong Bai Xianyou Wang National Base for International Science&Technology Cooperation National Local Joint Engineering Laboratory for Key Materials of New Energy Storage BatteryHunan Province Key Laboratory of Electrochemical Energy Storage&ConversionSchool of ChemistryXiangtan UniversityXiangtan 411105HunanChina State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China Key Laboratory of Hunan Province for Advanced Carbon-based Functional Materials School of Chemistry and Chemical EngineeringHunan Institute of Science and TechnologyYueyang 414006HunanChina

Lithium-rich manganese-based materials(LRMs) are promising cathode for high-energy-density lithiumion batteries due to their high capacity,low toxicity,and low ***,LRMs suffer from serious voltage decay and capacity fade due to continual migration and dissolution of transition metal ions(TMs) during cycling ***,a novel strategy is proposed to inhibit the TMs migration of LRMs through a modified separator by means of functionalized carbon coating layer,which depends on the chemical constraint of the abundant functional groups in the modified super *** addition,it has been found that the dissolution of TMs can be restrained based on the Le Chatelier's ***,the modified separator owns good wettability toward the *** a result,the LRMs cathode with the modified separator delivers a high discharge capacity of 329.93 mA h g-1 at 0.1 C,and achieves good cyclic performance,the enhanced reaction kinetics and low voltage ***,this work provides a new idea to promote the comprehensive electrochemical performances of Li-ion batteries with LRMs cathode through a strategy of separator modification.

关键词： Lithium-rich manganese-based materials functionalized separator TMs migration and dissolution Structure stability High-energy-density

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Understanding Dual-Polar Group functionalized COFs for Accelerating Li-Ion Transport and Dendrite-Free Deposition in Lithium Metal Anodes

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Energy & Environmental Materials 2023年第2期6卷 293-302页

作者： Qi An Hong-en Wang Genfu Zhao Shimin Wang Lufu Xu Han Wang Yao Fu Hong Guo School of Materials and Energy Yunnan UniversityNo.2Green Lake North RoadKunming 650091China College of Physics and Electronics Information Yunnan Key Laboratory of Optoelectronic Information TechnologyYunnan Normal UniversityKunming 650500China

Lithium metal batteries(LMBs)have attracted wide attentions because of their high theoretical specific capacity and low electrochemical ***,the growth of lithium dendrites seriously affects the practical application of ***,the lithium-philic carbonyl and carboxy dualgroup-modified covalent organic framework(COF-COOH)is designed to coat the polypropylene(PP)separator(COF-COOH@PP separator),realizing the regulation of ion transport and uniform lithium *** plentiful and negative charge sites in the COF-COOH can suppress the diffusion of the freely movable lithium salt anion by the electrostatic *** functional theory(DFT)calculations demonstrate that the COF-COOH possesses the function of anchoring anion and ***,the Li^(+)transference number(0.7),ion conductivity(0.64 mS cm^(-1)),and desolvating of Li^(+)are obviously improved by using the COF-COOH@PP *** modified Li-Li symmetric battery delivers stable cycle for more than 1000 h and lower voltage hysteresis(0.02 V).This dendrite-free deposition strategy holds great promise for practical application of Li metal anodes.

关键词： covalent organic frameworks dendrite-free functionalized separator lithiophilicity groups

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Enhancing electrochemical conversion of lithium polysulfide by 1T-rich MoSe_(2) nanosheets for high performance lithium-sulfur batteries

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Chinese Chemical Letters 2023年第11期34卷 360-366页

作者： Ruilong Li Zhe Bai Wensuo Hou Zeyu Wu Pingli Feng Yu Bai Kening Sun Zhenhua Wang Beijing Key Laboratory of Chemical Power Source and Green Catalysis School of Chemistry and Chemical EngineeringBeijing Institute of TechnologyBeijing 100081China

The sluggish conversion kinetics and shuttle effect of lithium polysulfides(LiPSs)severely hamper the commercialization of lithium-sulfur *** electrocatalysts have been used to address these issues,amongst which,transition metal dichalcogenides have shown excellent catalytic performance in the study of lithium-sulfur *** that dichalcogenides in different phases have different catalytic properties,and such catalytic materials in different phases have a prominent impact on the performance of lithium-sulfur ***,1T-phase rich MoSe_(2)(T-MoSe_(2))nanosheets are synthesized and used to catalyze the conversion of *** with the 2H-phase rich MoSe_(2)(H-MoSe_(2))nanosheets,the T-MoSe_(2) nanosheets significantly accelerate the liquid phase transformation of LiPSs and the nucleation process of ***-situ Raman and X-ray photoelectron spectroscopy(XPS)find that T-MoSe_(2) effectively captures LiPSs through the formation of Mo-S and Li-Se bonds,and simultaneously achieves fast catalytic conversion of *** lithium-sulfur batteries with T-MoSe_(2) functionalized separators display a fantastic rate performance of 770.1 mAh/g at 3 C and wonderful cycling stability,with a capacity decay rate as low as 0.065%during 400 cycles at 1 *** work offers a novel perspective for the rational design of selenide electrocatalysts in lithium-sulfur chemistry.

关键词： MoSe_(2) functionalized separator Lithium-sulfur battery Phase Catalytic conversion

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