|
| 富镍层状氧化物的失效机理及稳定性提升策略 |
| Failure Mechanisms and Stability Enhancement Strategies of Ni-Rich Layered Oxide Cathode Materials |
| 投稿时间：2025-04-07 修订日期：2025-05-17 |
| DOI： |
| 中文关键词: 锂离子电池 正极材料 富镍层状正极 改性策略 |
| 英文关键词:Lithium-ion battery, Cathode material, Ni-rich layered cathode, Modification strategy |
| 基金项目:广西科技发展专项资金 |
|
| 摘要点击次数: 29 |
| 全文下载次数: 0 |
| 中文摘要: |
| 富镍层状氧化物LiNixCoyMn1-x-yO2 (NCM, x ≥ 0.8) 作为新一代锂离子电池的正极材料，有望将能量和功率密度推向更高水平，得到学术界和工业界的广泛关注。然而，过高的镍含量会引起表面残碱过高、阳离子混排严重、多次相转变、表面结构劣化、微裂纹形成以及热稳定性降低等一系列问题，导致其容量快速衰减，这严重限制了富镍层状正极材料的广泛应用。本文先简单回顾了NCM的发展历程，随后针对富镍正极材料所存在的问题及失效机理进行分析，进而从元素掺杂、微观结构工程以及颗粒单晶化方面介绍最具代表性的改性策略及其改性机理，最后对NCM改性策略的研究方向进行展望，以期为推动正极材料进步提供有益的参考与借鉴。 |
| 英文摘要: |
| Ni-rich layered oxides LiNixCoyMn1-x-yO2 (NCM, x ≥ 0.8) have garnered significant attention from both academia and industry as a promising cathode material for lithium-ion batteries (LIBs) due to their high energy and power density. However, the increased Ni content introduces several challenges, including excessive surface residual lithium, severe cation mixing, multiple phase transitions, surface degradation, microcrack formation, and reduced thermal stability, all of which lead to rapid capacity decay and hinder their widespread application. This paper provides a brief overview of the development of NCM materials, followed by an in-depth analysis of the challenges associated with high-nickel cathodes and their failure mechanisms. Furthermore, representative modification strategies, including element doping, microstructure engineering, and particle single-crystallization, are discussed along with their underlying mechanisms. Finally, future research directions for improving the stability and performance of high-nickel NCM cathodes are outlined, aiming to provide valuable insights for advancing cathode material development. |
| 查看/发表评论 下载PDF阅读器 |
| 关闭 |
|
|
|