在锂离子电池中,正极材料是决定电池能量密度和循环寿命的关键因素之一,而粘结剂作为连接正极材料、导电材料和集流体的组分之一,对电极的结构稳定性和电化学性能发挥着重要的作用。聚偏氟乙烯(PVDF)是锂离子电池中使用的重要粘结剂,在充放电过程中,电极中脱锂和嵌锂的行为导致结构承受应力,引起PVDF粘结剂体积发生变化,这不仅导致了电池容量衰减,而且由于其相对较低的离子传导性,高倍率条件下性能表现不佳。总结了PVDF粘结剂在锂离子电池中的最新科研成果,深入分析了改性PVDF对锂电池电性能和电解质/活性物质界面形成的影响机制,系统阐述PVDF改性方式对提高锂离子电池性能的作用机理,展望了高性能PVDF粘结剂的发展方向。
In lithium-ion batteries,the cathode material is one of critical factors determining the battery's energy density and cycle life.As a component that bonds the cathode material,conductive material,and current collector,the binder plays a crucial role in the structural stability and electrochemical performance of the electrode.Polyvinylidene fluoride (PVDF) is a significant binder utilized in lithium-ion batteries.During the charge and discharge processes,the phenomena of lithium deintercalation and intercalation within the electrode subject the structure to mechanical stress,resulting in volume changes of the PVDF binder.This not only contributes to the degradation of battery capacity but also results in suboptimal performance under high-rate conditions due to its relatively low ionic conductivity.This paper summarized the latest research findings on PVDF binders in lithium-ion batteries.It delved into an in-depth analysis of the impact of modified PVDF on the electrochemical properties of lithium batteries and the mechanism by which the electrolyte/active material interface was formed.The paper systematically elucidated the effects of PVDF modification strategies on enhancing the performance of lithium-ion batteries and offered a perspective on the future development of high-performance PVDF binders.
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基金资助
国家重点研发计划子课题项目(2020YFB1505901);湖南省自然科学基金(联合基金)项目(2023JJ50187)
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