<br>LiMnO2的进展、挑战与前景：高能低成本锂离子电池的探索,Advanced Science

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LiMnO2的进展、挑战与前景：高能低成本锂离子电池的探索
Advanced Science ( IF 14.3 ) Pub Date : 2023-11-14 , DOI: 10.1002/advs.202304938
Jin Ma _{1,

2} , Tingting Liu _{1,

2} , Jie Ma ₃ , Chi Zhang _{1,

2} , Jinhu Yang _{1,

2}

Affiliation

由于其低成本和可用资源，锂锰氧化物被认为是有前途的锂离子电池阴极。具有斜方或单斜结构的层状LiMnO ₂因其超高的理论容量（285 mAh g ^-1 ）而引起了极大的兴趣，几乎是商业尖晶石LiMn ₂ O ₄ （148 mAh g ^-1 ）的两倍。然而，由于高自旋Mn ³⁺的Jahn-Teller效应，LiMnO ₂在循环时经历相变至尖晶石。此外，Mn ³⁺歧化产生可溶性Mn ²⁺ ，电化学过程中氧气释放可能导致循环性能不佳。为了解决关键问题，我们付出了巨大努力。本文对层状LiMnO ₂材料进行了综述，包括其晶体结构、合成方法、结构/元素修饰和电化学性能。首先概述了LiMnO ₂的晶体结构和合成方法。随后，全面回顾了提高电化学性能的改性策略，包括元素掺杂以抑制其相变、表面涂层以阻止锰溶解到电解质中并阻碍表面反应、设计LiMnO ₂复合材料以提高电子电导率和Li ⁺扩散，并发现兼容电解质以提高安全性。最后对LiMnO ₂的研究前沿和实际应用进行了展望。

"点击查看英文标题和摘要"

Progress, Challenge, and Prospect of LiMnO2: An Adventure toward High-Energy and Low-Cost Li-Ion Batteries

Lithium manganese oxides are considered as promising cathodes for lithium-ion batteries due to their low cost and available resources. Layered LiMnO₂ with orthorhombic or monoclinic structure has attracted tremendous interest thanks to its ultrahigh theoretical capacity (285 mAh g⁻¹) that almost doubles that of commercialized spinel LiMn₂O₄ (148 mAh g⁻¹). However, LiMnO₂ undergoes phase transition to spinel upon cycling cause by the Jahn-Teller effect of the high-spin Mn³⁺. In addition, soluble Mn²⁺ generates from the disproportionation of Mn³⁺ and oxygen release during electrochemical processes may cause poor cycle performance. To address the critical issues, tremendous efforts have been made. This paper provides a general review of layered LiMnO₂ materials including their crystal structures, synthesis methods, structural/elemental modifications, and electrochemical performance. In brief, first the crystal structures of LiMnO₂ and synthetic methods have been summarized. Subsequently, modification strategies for improving electrochemical performance are comprehensively reviewed, including element doping to suppress its phase transition, surface coating to resist manganese dissolution into the electrolyte and impede surface reactions, designing LiMnO₂ composites to improve electronic conductivity and Li⁺ diffusion, and finding compatible electrolytes to enhance safety. At last, future efforts on the research frontier and practical application of LiMnO₂ have been discussed.

更新日期：2023-11-14

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