Qiao Xianji, Wang Liguang, Lu Jun
College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310058, China.
Research (Wash D C). 2024 Sep 18;7:0489. doi: 10.34133/research.0489. eCollection 2024.
Layered structure oxides have emerged as highly promising cathode materials for lithium-ion batteries. In these cathode materials, volume variation related to anisotropic lattice strain during Li insertion/extraction, however, can induce critical structural instability and electrochemical degradation upon cycling. Despite extensive research efforts, solving the issues of lattice strain and mechanical fatigue remains a challenge. This perspective aims to establish the "structure-property relationship" between the degradation mechanism of the layered oxide cathode due to lattice strain and the structural evolution during cycling. By addressing these issues, we aim to guide the improvement of electrochemical performance, thereby facilitating the widespread adoption of these materials in future high-energy density lithium-ion batteries.
层状结构氧化物已成为锂离子电池极具前景的阴极材料。然而，在这些阴极材料中，锂嵌入/脱出过程中与各向异性晶格应变相关的体积变化会在循环过程中引发严重的结构不稳定性和电化学性能退化。尽管进行了广泛的研究，但解决晶格应变和机械疲劳问题仍然是一项挑战。本观点旨在建立层状氧化物阴极因晶格应变导致的降解机制与循环过程中的结构演变之间的“结构-性能关系”。通过解决这些问题，我们旨在指导电化学性能的提升，从而促进这些材料在未来高能量密度锂离子电池中的广泛应用。
