高压锂电池正极电解质界面研究进展  

Research Progress on Cathode Electrolyte Interphase in High-Voltage Lithium Batteries

作　　者：刘建东 张志佳 Mikhail Kamenskii Filipp Volkov Svetlana Eliseeva 马建民 Jiandong Liu;Zhijia Zhang;Mikhail Kamenskii;Filipp Volkov;Svetlana Eliseeva;Jianmin Ma(School of Chemistry,Tiangong University,Tianjin 300387,China;School of Physics and Electronics,Hunan University,Changsha 410022,China;School of Material Science and Engineering,Tiangong University,Tianjin 300387,China;Institute of Chemistry,Saint Petersburg State University,Saint Petersburg 199034,Russia)

机构地区：[1]天津工业大学化学学院,天津300387 [2]湖南大学物理与微电子科学学院,长沙410022 [3]天津工业大学材料科学与工程学院,天津300387 [4]Institute of Chemistry,Saint Petersburg State University,Saint Petersburg 199034,Russia

出　　处：《物理化学学报》2025年第2期1-13,共13页Acta Physico-Chimica Sinica

基　　金：国家自然科学基金(U21A20311)资助项目。

摘　　要：提高电池的截止电压上限可以显著提升锂电池的能量密度。然而,高截止电压也会导致正极材料在高压下发生不可逆相变和副反应,从而损害电池性能。为了解决这一问题,建立一个稳定的正极电解质界面(CEI)在提高电池性能方面起到了关键作用。本文探讨了CEI的形成机制,并概述了构建CEI的方法,包括人工构建CEI和原位生成CEI。此外,从电解质的角度出发,我们还展望了构建高压正极CEI的设计思路。Achieving high energy density batteries is currently a key focus in the field of energy storage.Lithium batteries,due to their high energy density,have garnered significant attention in research.Increasing the upper limit of the battery’s cut-off voltage can boost the energy density of lithium batteries.However,high-voltage conditions can lead to irreversible phase transitions and side reactions in cathode materials,which can degrade battery performance and even result in safety risks,including explosions.The electrolyte can also decompose,causing capacity loss and releasing flammable gases when subjected to high voltage,which can lead to battery swelling and potential combustion and explosions.Designing an ideal cathode electrolyte interphase(CEI)on the cathode’s surface to regulate the electrode-electrolyte interface reaction can effectively enhance the cycling stability of the battery,reduce irreversible phase transitions in the cathode,and improve the oxidation stability of the electrolyte.The ideal CEI should possess high ion conductivity,high thermal stability,and should minimize interface side reactions to ensure optimal battery performance.Understanding the formation and development of CEI is crucial for enhancing battery performance under high voltage.Apart from creating artificial CEI,modifying electrolytes has gained significant attention.By altering the electrolyte recipe,an ideal CEI can be achieved.Electrolyte engineering is considered an effective strategy for attaining an ideal CEI and enhancing the stability of high nickel positive electrodes.This approach is simple,cost-effective,and holds great promise for achieving higher energy density in lithium batteries.To provide a better understanding of CEI in lithium ion batteries(LIBs),this article reviews the latest advancements in CEI,including the formation mechanism of CEI,the key factors influencing CEI,methods for modifying CEI,and techniques for characterizing CEI.Additionally,it summarizes the current status of artificial CEI development a

关 键 词：高压正极 正极电解质界面 电解质工程 电解质添加剂 锂电池 

分 类 号：O646[理学—物理化学]