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Durable semi-crystalline interphase engineering to stabilize high voltage Ni-rich cathode in dilute ether electrolyte

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Journal of Energy Chemistry 2023年第4期79卷 110-117页

作者： Zhuangzhuang Cui Shunqiang Chen Qingshun Nian Yecheng li Yawei Chen Bing-Qing Xiong Zihong Wang Zixu He Shuhong Jiao Xiaodi Ren School of Chemistry and Materials Science University of Science and Technology of ChinaHefei 230026AnhuiChina

Ethers are promising electrolyte solvents for secondary li metal batteries because of their excellent reduction stability.However,their oxidation stability has been mostly relying on the high concentration approach,and limited progress has been made on building effective interphase to protect the cathode from the corrosion of the electrolyte.In this work,we construct a semi-crystalline interfacial layer on the surface of li(Ni_(0.8)Co_(0.1)Mn_(0.1))O_(2)cathode that can achieve improved electrochemical stability in the highly corrosive chemical environment formed by the decomposition of ether molecules.Different from traditional brittle crystalline interphases,the optimized semi-crystalline layer with low modulus and high ionic conductivity can effectively relieve electrode strain and maintain the integrity of the interface layer.Due to this design,the continuous oxidation decomposition of ether-based electrolytes could be significantly suppressed and the battery shows outstanding cycling stability(84%capacity retention after 300 cycles).This article provides a solution to address the oxidation instability issue of ether-based electrolytes.

关键词： Cathode/electrolyte interphase Semi-crystalline Ether electrolyte High-voltage cathode li-metal batteries

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In situ preparation of gel polymer electrolyte for lithium batteries: Progress and perspectives

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InfoMat 2022年第2期4卷 110-125页

作者： Chao Ma Wenfeng Cui Xizheng liu Yi Ding Yonggang Wang Tianjin Key Laboratory of Advanced Functional Porous Materials Institute for New Energy Materials and Low-Carbon TechnologiesSchool of Materials Science and EngineeringTianjin University of TechnologyTianjinChina Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials Institute of New EnergyiChEM(Collaborative Innovation Center of Chemistry for Energy Materials)Fudan UniversityShanghaiChina

The practical applications of li-ion batteries(liBs)are challenged by their safety concerns when using liquid electrolytes(LEs).Solid-state gel polymer electrolytes(GPEs)can address this challenge and have drawn increased attention recently.Normally,GPEs are prepared separately and then assembled into cells,which undoubtedly result in dissatisfactory solid/solid interfacial compatibility and low ionic conductivity.Fortunately,in situ GPEs are proposed to address the above challenges and simplify the preparation process.Typically,LE precursor is injected into the cells and gradually transformed into a quasisolid gel state under the conditions of thermal or chemical initiators.Consequently,the obtained in situ GPEs could fully infiltrate the electrode and better interface contact of gel electrolyte/electrode is thus inherited.In this review,the authors focus on the in situ GPEs used in lithium batteries(LBs),and summarize recent progress of the design,synthesis,and applications of in situ GPEs.Based on the different ways of triggering polymerization,there are mainly three methods:thermochemical gelation,polymerization by additional chemical initiators,and cross-linking initiated by li O bond.Composite GPEs based on in situ solidification method are introduced as a promising strategy to improve the electrochemical performances.Finally,up-to-date research progresses are discussed,and perspectives are provided on the development and challenges of in situ GPEs to meet the requirements for their practical applications in LBs.

关键词： cross-linking gel electrolytes in situ preparation li-metal batteries polymerization

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Oxidization of fluid-like li metal with inherent lieli_(2)O interface from simulation insights

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Journal of Materiomics 2020年第4期6卷 692-701页

作者： Xia Lu Xingqun liao School of Materials Sun Yat-sen UniversityGuangzhou510275China Huizhou Highpower Technology Co.Ltd. Huizhou516000China

The oxidization of pure li is rarely discussed,but substantially important in the design and optimization,especially the failure mechanism of li metal anode for rechargeable batteries.In this context,the li metal and inherent lieli_(2)O interface after oxidization are examined using first principles calculations.The results demonstrated that in li itself,the li ion exhibits a fluid-like transport feature,especially in the vacancy-assisted migration.The fresh li surface can be oxidized quickly in air with a thick cover(mainly li oxides),and an inherent lieli_(2)O interface is,therefore,introduced.With the lowest surface energy,the li(111)plane is revealed with a strong capability of adsorbing O and N atoms to form the distorted Xli6(X=O,N,etc.)octahedra in the outmost surface layers.Although the li ion migrates fast in li itself,the lieli_(2)O interface shows a sluggish li diffusion kinetic in li_(2)O side.This ultimately leads to the li diffusion prefers to go along the interface boundary in li side,which loosens the lieli2O interface structure to result in the exfoliation of surface metastable li_(2)O spontaneously during electrochemical cycles in limetal batteries.

关键词： li metal li-li_(2)O interface Stability Kinetics li-metal batteries

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