Dual-Functional Tungsten Boosted Lithium-Ion Diffusion and Structural Integrity of LiNi0.8Co0.1Mn0.1O2 Cathodes for High Performance Lithium-Ion Batteries,ACS Sustainable Chemistry & Engineering

当前位置： X-MOL 学术 › ACS Sustain. Chem. Eng. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Dual-Functional Tungsten Boosted Lithium-Ion Diffusion and Structural Integrity of LiNi0.8Co0.1Mn0.1O2 Cathodes for High Performance Lithium-Ion Batteries
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2021-12-27 , DOI: 10.1021/acssuschemeng.1c04076
Zhenhua Zhu ₁ , Aimei Gao ₁ , Yansheng Liang ₁ , Fenyun Yi ₁ , Tao Meng ₂ , Jingzhou Ling ₁ , Junnan Hao ₃ , Dong Shu _{1,

4}

Affiliation

In this work, a series of LiNi_0.8Co_0.1Mn_0.1O₂ oxides with dual-functional heterostructure are acquired from a trace tungsten (W) modification strategy; such a heterostructure contains a gradient tungsten distribution structure and a fast ion-conductive Li_xWO_y coating layer that are in situ formed via thermodynamic diffusion during the calcination process. The gradient doping can increase the lattice parameters because of the large radius of tungsten, then further to expand interlayer spacing and facilitate the lithium-ion diffusion coefficient which can enhance the capacity and rate performance. Besides, the strong W–O bonds can improve the stability of the lattice and promote the structural integrity and thermostability. Meanwhile, the fast ion-conductive Li_xWO_y layer can not only facilitate the rate of Li⁺ deintercalation, but also act as a defensive layer to suppress side reactions and then improve the cycling property. As a result of the dual-functional heterostructure, the W-modified LiNi_0.8Co_0.1Mn_0.1O₂ with the mass fraction of 4500 ppm (W4500) shows a superior discharge capacity of 165.5 mAh g^–1 at 5.0 C and an enhanced cycle retention of 88.4% (25 °C) after 100 cycles. Especially, the positive electrode of W4500 delivers a better structural integrity than that of pristine. The investigation elaborates the characters of the dual-functional tungsten modification and offers a path to prepare better Ni-rich layered oxides for lithium-ion batteries.

中文翻译：

用于高性能锂离子电池的双功能钨促进锂离子扩散和 LiNi0.8Co0.1Mn0.1O2 阴极的结构完整性

在这项工作中，通过微量钨（W）改性策略获得了一系列具有双功能异质结构的LiNi _0.8 Co _0.1 Mn _0.1 O ₂氧化物；这种异质结构包含梯度钨分布结构和快速离子导电 Li _x WO _y在煅烧过程中通过热力学扩散原位形成的涂层。由于钨的大半径，梯度掺杂可以增加晶格参数，进而扩大层间距，促进锂离子扩散系数，从而提高容量和倍率性能。此外，强W-O键可以提高晶格的稳定性，促进结构完整性和热稳定性。同时，快速离子导电的Li _x WO _y层不仅可以促进Li ^{+ 的}脱嵌速率，还可以作为防御层来抑制副反应，从而提高循环性能。由于双功能异质结构，W 改性的 LiNi _0.8质量分数为 4500 ppm (W4500) 的Co _0.1 Mn _0.1 O ₂在 5.0 C时具有 165.5 mAh g ^–1的优异放电容量，并且在 100 次循环后循环保持率提高了 88.4% (25 °C)。特别是，W4500 的正极提供了比原始正极更好的结构完整性。该研究详细阐述了双功能钨改性的特性，并为制备更好的锂离子电池富镍层状氧化物提供了途径。

更新日期：2022-01-10

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南