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丰富的同贫的阴极的组成梯度设计提高了高压离子电池的循环和安全性

Wenshuai Guo¹, Haifeng Yu¹, Min Wang²

¹Shanghai Engineering Research Center of Hierarchical Nanomaterials, Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China.

|February 20, 2025

概括

为高能离子电池开发先进的富含Ni的阴极至关重要. 这项研究介绍了一种渐变阴极设计,提高了下一代能源存储的稳定性和性能.

科学领域:

材料科学材料科学材料科学
电化学电化学电化学
储能储能储能储能储能储能

背景情况:

高能离子电池需要先进的正极材料.
富含的阴极提供高能量密度,但面临着稳定性挑战.
传统的超高Ni阴极在机械和化学稳定性方面存在局限性.

研究的目的:

设计和合成一个具有成本效益,稳定,高压的丰富的阴极.
为了提高丰富的阴极的机械和化学稳定性,用于高能应用.
探索Ni丰富的阴极材料中的组合梯度设计的潜力.

主要方法:

一个完全度梯度LiNi_0.75Mn_0.20Co_0.05O₂阴极的合成.
在现场形成酸盐 (PO₄^3-) 梯度以控制离子扩散.
用Li_0.1B_0.967PO₄进行表面涂层,以提高接口的稳定性.
在全电池中对正极性能进行电化学测试.

主要成果:

实现了 212.6 mAh g-1 的可逆容量,电压为 2.7-4.5 V,能量密度为 >800 Wh kg-1.
在1C (2.7-4.5V) 的1700个循环后,经过80.5%的容量保留,证明了优越的循环寿命.
在高压操作下减轻了机械应力和抑制了网格氧气损失.
通过酸盐涂层改善了表面寄生反应,确保了稳定的接口化学.

结论:

开发的全度梯度阴极表现出增强的稳定性和高能量密度.
复合梯度设计是改善丰富阴极性能的一个有前途的策略.
该材料显示了下一代高能离子电池的潜力.
该研究强调了表面修饰和控制的离子扩散对于稳定的高压运行的重要性.

关键词:

离子电池是一种离子电池.富含的阴极是什么意思完全的度梯度完全的度梯度高能量密度的高能量密度.界面稳定性界面稳定性

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