Li-Deficient Materials-Decoration Restrains Oxygen Evolution Achieving Excellent Cycling Stability of Li-Rich Mn-Based Cathode,ACS Applied Materials & Interfaces

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Li-Deficient Materials-Decoration Restrains Oxygen Evolution Achieving Excellent Cycling Stability of Li-Rich Mn-Based Cathode
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2022-06-23 , DOI: 10.1021/acsami.2c03073
Xueqian Ji _{1,

2} , Yuxing Xu _{1,

3} , Qing Xia _{1,

3} , Yuncheng Zhou _{1,

2} , Jiechen Song _{1,

2} , Hailan Feng _{1,

3} , Pengfei Wang _{1,

3} , Jun Yang ₁ , Qiangqiang Tan _{1,

2,

3,

4}

Affiliation

With the increasing demand for high energy density and rapid charging performance, Li-rich materials have been the up and coming cathodes for next-generation lithium-ion batteries. However, because of oxygen evolution and structural instability, the commercialization of Li-rich materials is extremely retarded by their poor electrochemical performances. In this work, Li-deficient materials Li_0.3NbO₂ and (Nb_0.62Li_0.15)TiO₃ are applied to functionalize the surface of Li_1.2Mn_0.54Ni_0.13Co_0.13O₂, aiming to suppress oxygen evolution and increase structural stability in LIBs. In addition, a fast Li-ion transport channel is beneficial to enhance Li⁺ diffusion kinetics. The results demonstrate that the electrodes decorated with Li_0.3NbO₂ and (Nb_0.62Li_0.15)TiO₃ materials exhibit more stable cycling stability after long-term cycling and outstanding rate capability.

中文翻译：

缺锂材料-装饰抑制析氧，实现富锂锰基正极优异的循环稳定性

随着对高能量密度和快速充电性能的需求不断增加，富锂材料已成为下一代锂离子电池的新兴正极。然而，由于析氧和结构不稳定性，富锂材料的电化学性能差，极大地阻碍了其商业化。本工作采用缺锂材料Li _0.3 NbO ₂和(Nb _0.62 Li _0.15 )TiO _3对Li_1.2 Mn _0.54 Ni _0.13 Co _0.13 O ₂的表面进行功能化。，旨在抑制氧气释放并提高LIB的结构稳定性。此外，快速的锂离子传输通道有利于增强锂离子的^扩散动力学。结果表明，用Li _0.3 NbO ₂和(Nb _0.62 Li _0.15 )TiO ₃材料装饰的电极在长期循环后表现出更稳定的循环稳定性和优异的倍率性能。

更新日期：2022-06-23

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