尖晶石
材料科学
阴极
化学工程
涂层
电化学
结构稳定性
表面工程
热稳定性
氧化物
析氧
电催化剂
表层
退火(玻璃)
图层(电子)
溶解
表面能
纳米技术
表面改性
相(物质)
纳米颗粒
表面扩散
比表面积
扩散层
结构材料
电极
氧气
作者
Jinzhen Hu,Bingchen Wu,Feng Wang,Hui Guo,Jihuan Xie,Xueyi Sun,Junhang Tian,Nuria Tapia‐Ruiz,Weidong Zhuang
出处
期刊:Small
[Wiley]
日期:2025-11-06
卷期号:21 (50): e09446-e09446
标识
DOI:10.1002/smll.202509446
摘要
Lithium-rich manganese-based layered oxides (LRO) are promising ultra-high-capacity cathode materials for next-generation lithium-ion batteries but suffer from structural instability, capacity/voltage decay, and poor rate capability. Herein, a novel surface spinel coating strategy is proposed to address these challenges through a citric acid solution treatment followed by thermal annealing. A Li4Mn5O12 spinel coating layer is formed on the cathode material surface via Li+/H+ exchange and structural rearrangement, while preserving the bulk-layered structure. The spinel phase not only suppresses interfacial side reactions and lattice oxygen loss but also establishes 3D Li+ diffusion channels, enhancing kinetics and surface stability. The modified cathode material exhibits remarkable electrochemical improvements with a high-rate capacity of 205.29 mAh g-1 at 5 C, and 86.3% capacity retention after 150 cycles at 1 C, outperforming the untreated LRO. This work provides a scalable surface engineering approach to reconcile the trade-off between high energy density and long-cycle stability in the LRO, advancing their practical viability for high-energy-density batteries.
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