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Realizing a“solid to solid”process via in situ cathode electrolyte interface(CEI)by solvent-in-salt electrolyte for Li-S batteries

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Nano Research 2023年第4期16卷 5018-5025页

作者： Jiajun Huang Mengli Tao Weifeng Zhang Guangli Zheng Li Du Zhiming Cui Xiujun Wang Zhenxing Liang Shijun Liao Huiyu Song Guangdong Provincial Key Laboratory of Fuel Cell Technology Guangzhou 510641China School of Chemistry and Chemical Engineering South China University of TechnologyGuangzhou 510641China

Lithium-sulfur batteries(LSBs)are regarded as the most promising next-generation energy system due to their high theoretical energy ***,LSBs suffer the“shuttle effect”if undergoing the solid-liquid-solid sulfur conversion process during ***,we design a solvent-in-salt(SIS)electrolyte with co-solvent vinylene carbonate(VC)to synthesize an in situ dense cathode electrolyte interface(CEI)and successfully change sulfur conversion into a solid-solid way to avoid shuttle effect by separating the contact of sulfur and ether *** CEI is formed at the beginning of first discharge by the combined action of SIS electrolyte and filmogen *** and simulations show that SIS electrolyte controls the initial formed lithium polysulfides(LiPSs)to stay very closely on the cathode surface,and then converts them into a dense CEI *** a result,Coulombic efficiency(above 99%)and cycling performance of LSBs are ***,the in situ dense CEI can nearly stop the self-discharge of LSBs,and enable the LSBs to work under a pretty lean electrolyte condition.

关键词： lithium-sulfur battery solid-solid conversion cathode electrolyte interface no-shuttle-effect

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Impact of evolution of cathode electrolyte interface of Li(Ni0.8Co0.1Mn0.1)O2 on electrochemical performance during high voltage cycling process

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Journal of Energy Chemistry 2020年第8期29卷 72-78,I0003页

作者： Wei Wang Qin Yang Kun Qian Baohua Li Engineering Laboratory for Next Generation Power and Energy Storage Batteries Graduate School at ShenzhenTsinghua UniversityShenzhen 518055GuangdongChina School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China

In this work, the electrochemical performance of LiNi0.8Co0.1Mn0.1O2(NCM811) has been investigated after cycling with various upper cutoff voltages. Noteworthily, electrochemical impedance of NCM811 declined with the increasing cycle number to high voltages. It was found that the decline of charge transfer impedance could be related to the structural and compositional change of cathode electrolyte interphase(CEI) of NCM811 when charging to high voltages, based on the characterization of electrochemical impedance spectroscopy(EIS), X-ray photoelectron spectroscopy(XPS) and transmission electron microscopy(TEM). The corresponding mechanism has also been proposed in this study. Specifically, due to the increasing roughness of cathode surface, the bottom of CEI film and cubic phase on cathode surface form a transition region mainly at high voltages, leading to the nonobvious boundary. This newly formed transition region at high voltages could promote the Li ion diffusion from electrolyte to cathode, then reducing charge transfer impedance. Additionally, the decrease of Li F on the surface of the cathode could also make a contribution to lower the interface impedance. This study delivers a different evolution of CEI on NCM811, and the impact of CEI evolution on electrochemical performance when charging to a high voltage.

关键词： cathode electrolyte interface NCM811 Overcharge Rock salt phase

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LiPO_(2)F_(2) electrolyte additive for high-performance Li-rich cathode material

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Journal of Energy Chemistry 2021年第9期30卷 564-571页

作者： Bing Jiang Jingru Li Bi Luo Qizhang Yan Hao Li Lehao Liu Lihua Chu Yingfeng Li Qiaobao Zhang Meicheng Li School of New Energy North China Electric Power UniversityBeijing 102206China Department of Materials Science and Engineering College of MaterialsXiamen UniversityXiamen 361005FujianChina Department of NanoEngineering University of CaliforniaSan DiegoLa JollaCA 92093United States

Li-rich layered oxide cathodes have received considerable attention because of the high operating potential and specific capacity. However, the structural instability and parasitic reactions at high potential cause severe degradation of the electrochemical performance. In our studies, the cycling stability of Li_(1.14)Ni_(0.133)Co_(0.133)Mn_(0.544)O_(2) cathode is improved with LiPO_(2)F_(2) electrolyte additive. After 500 cycles, the capacity retention is increased from 53.6% to 85% at 3 C by LiPO_(2)F_(2) modification. This performance is mainly attributed to the enhanced interfacial stability of the Li-rich cathode. Based on systematic characterization, LiPO_(2)F_(2) additive was found to promote a stable interface film on the cathode surface during the cycling and mitigates the interfacial side reactions. This study provides new insights for improving high-potential Li-rich layered oxide batteries.

关键词： Li-rich cathode cathode electrolyte interface LiPO_(2)F_(2) High energy density

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Charactering and optimizing cathode electrolytes interface for advanced rechargeable batteries:Promises and challenges

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Green Energy & Environment 2022年第4期7卷 606-635页

作者： Zhongyang Zhang Xinran Wang Ying Bai Chuan Wu Beijing Key Laboratory of Environmental Science and Engineering School of Materials Science&EngineeringBeijing Institute of TechnologyBeijingChina Yangtze Delta Region Academy of Beijing Institute of Technology Jiaxing314019China

With the advancement of secondary batteries,interfacial properties of electrode materials have been recognized as essential factors to their electrochemical ***,the majority of investigations are devoted into advanced electrode materials synthesis,while there is insufficient attention paid to regulate their *** this regard,the solid electrolyte interphase(SEI)at anode part has been studied for 40 years,already achieving remarkable outcomes on improving the stability of anode ***,the study on the cathode electrolyte interfaces(CEI)remains in infancy,which constitutes a potential restriction to the capacity contribution,stability and safety of *** fact,the native CEI generally possesses unfavorable characteristics against structural and compositional stability that requires demanding optimization ***,an in-depth understanding of the CEI is of great significance to guide the optimization principles in terms of composition,structure,growth mechanism,and electrochemical *** this literature,recent progress and advances of the CEI characterization methods and optimization protocols are summarized,and meanwhile the mutually-reinforced mechanisms between detection and modification are *** criteria and the potential development of the CEI characterization are proposed with insights of novel optimization directions.

关键词： cathode electrolyte interface Secondary battery Characterization methods In situ/operando Synchrotron radiation

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