Heuristic Design of Cathode Hybrid Coating for Power‐Limited Sulfide‐Based All‐Solid‐State Lithium Batteries

材料科学 阴极 硫化物 涂层 纳米技术 化学工程 电气工程 工程类 冶金
作者
Yuhao Liang,Hong Liu,Guoxu Wang,Chao Wang,Dabing Li,Yu Ni,Li‐Zhen Fan
出处
期刊:Advanced Energy Materials [Wiley]
卷期号:12 (33) 被引量:59
标识
DOI:10.1002/aenm.202201555
摘要

Abstract Engineered cathode active materials are critical for the cycling stability and power capability of sulfide‐based all‐solid‐state lithium batteries (ASSBs), yet it is challenging to construct uniform coverage via a scalable approach. In addition, the implication of dielectric coatings for electronic migration blocking in the composite cathode is neglected habitually. A heuristic “polymer‐patched inorganic” cathode coating strategy is presented herein. Single‐crystalline LiNi 0.6 Co 0.2 Mn 0.2 O 2 (SNCM) particles are uniformly coated with a hybrid layer comprising nanoscale Li 1.4 Al 0.4 Ti 1.6 (PO 4 ) 3 (LATP) and cyclized polyacrylonitrile (cPAN), via a scalable solution‐based method. The LATP coating ensures rapid Li + transfer across the interface and offers high oxidation tolerance. cPAN partially‐submerges and patches the imperfections of the LATP coating layer, producing a high‐quality protective coating without compromising electronic transfer. Accordingly, sulfide‐based ASSBs employing the hybrid‐modified SNCM cathode demonstrate competitive electrochemical performance in terms of capacity retention (72.7% over 500 cycles, at 0.5 C), and rate capability (87.3 mAh g −1 at 2 C, 5 times that of the pristine SNCM). Significant improvements are attributed to the homogeneity and functionality of the coating, which mitigates parasitic reactions at the interface while simultaneously preserving indispensable electronic percolation. This work offers a brand‐new cathode coating protocol for sulfide‐based all‐solid‐state to achieve longevity and good power.
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