材料科学
分离器(采油)
电解质
化学工程
热稳定性
多孔性
阴极
介孔材料
膜
介孔二氧化硅
锂离子电池
电化学
润湿
电池(电)
复合材料
电极
有机化学
化学
物理化学
催化作用
功率(物理)
工程类
物理
热力学
量子力学
生物化学
作者
Jing Wang,Yupu Liu,Qingfu Cai,Angang Dong,Dong Yang,Dongyuan Zhao
标识
DOI:10.1002/adma.202107957
摘要
Commercial polymeric separators in lithium-ion batteries (LIBs) typically suffer from limited porosity, low electrolyte wettability, and poor thermal and mechanical stability, which can degrade the battery performance especially at high current densities. Here, the design of hierarchically porous, ultralight silica membranes as separator for high-performance LIBs is reported through the assembly of hollow mesoporous silica (HMS) particles on the cathode surface. The rich mesopores and large cavity of individual HMS particles provide low-tortuosity pathways for ionic transport, while simultaneously serving as electrolyte reservoir to further boost the electrochemical kinetics. Moreover, benefiting from their inorganic and hierarchically porous nature, such HMS separators display better electrolyte affinity, thermal stability, and mechanical strength than commercial polypropylene (PP) separators. As a demonstration, LIBs with a LiFePO4 cathode coated with HMS separators exhibit exceptional rate capability and cycling stability, outperforming LIBs with PP and Al2 O3 -modified PP separators as well as separators made of solid silica particles.
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