Artificial Post-Cycled Structure Modulation Towards Highly Stable Li-Rich Layered Cathode

被引：5

作者：

Han, Xiao ^{[1
]}

Liu, Ailin ^{[1
]}

Wang, Shihao ^{[1
]}

Liu, Yuanyuan ^{[1
]}

Li, Saichao ^{[1
]}

Zhang, Yinggan ^{[1
]}

Zheng, Hongfei ^{[1
]}

Sa, Baisheng ^{[2
]}

Wang, Laisen ^{[1
]}

Lin, Jie ^{[1
]}

Qu, Baihua ^{[3
]}

Xie, Qingshui ^{[1
,4
]}

Peng, Dong-Liang ^{[1
]}

机构：

[1] Xiamen Univ, Coll Mat, State Key Lab Phys Chem Solid Surface, Fujian Key Lab Surface & Interface Engn High Perfo, Xiamen 361005, Peoples R China

[2] Fuzhou Univ, Coll Mat Sci & Engn, Multiscale Computat Mat Facil, Fuzhou 350100, Peoples R China

[3] Chongqing Univ, Coll Mat Sci & Engn, Chongqing 400044, Peoples R China

[4] Xiamen Univ, Shenzhen Res Inst, Shenzhen 518000, Peoples R China

来源：

SMALL | 2023年 / 19卷 / 47期

基金：

中国国家自然科学基金;

关键词：

artificial post-cycled structures; cation mixing; cycling stability; electronic structure modulation; Li-rich layered cathodes; LITHIUM; VOLTAGE; NICKEL; SEGREGATION; DEGRADATION; CHEMISTRY; LATTICE; OXIDES;

D O I：

10.1002/smll.202303256

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

High-capacity Li-rich layered oxides (LLOs) suffer from severe structure degradation due to the utilization of hybrid anion- and cation-redox activity. The native post-cycled structure, composed of progressively densified defective spinel layer (DSL) and intrinsic cations mixing, is deemed as the hindrance of the rapid and reversible de/intercalation of Li+. Herein, the artificial post-cycled structure consisting of artificial DSL and inner cations mixing is in situ constructed, which would act as a shield against the irreversible oxygen emission and undesirable transition metal migration by suppressing anion redox activity and modulating cation mixing. Eventually, the modified DSL-2% Li-rich cathode demonstrates remarkable electrochemical properties with a high discharge capacity of 187 mAh g(-1) after 500 cycles at 2 C, and improved voltage stability. Even under harsh operating conditions of 50 & DEG;C, DSL-2% can provide a high discharge capacity of 168 mAh g(-1) after 250 cycles at 2 C, which is much higher than that of pristine LLO (92 mAh g(-1)). Furthermore, the artificial post-cycled structure provides a novel perspective on the role of native post-cycled structure in sustaining the lattice structure of the lithium-depleted region and also provides an insightful universal design principle for highly stable intercalated materials with anionic redox activity.

引用

页数：13

共 53 条

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