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LiNi_0.5 Mn_1.5 O₄ 5个V级全固态电池的阴极的相间稳定

Dongsoo Lee¹, Zehao Cui¹, John B Goodenough¹

¹Materials Science and Engineering Program and Texas Materials Institute, The University of Texas at Austin, Austin, TX, 78712-1591, USA.

Small (Weinheim an der Bergstrasse, Germany)

|September 2, 2023

概括

像,,氧化物 (LNMO) 这样的高压无螺旋阴极在全固态电池中面临着挑战. 补充剂和保护性涂层显著提高了界面稳定性,以确保可靠的高压操作.

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
固态电池固态电池是什么

背景情况:

高压无螺旋氧化 (LNMO) 为电池提供高能量密度和成本效益.
在整体固态电池 (ASSB) 中集成LNMO阴极与固体电解质存在挑战.
化学不相容性和氧化不稳定性限制了LNMO与硫化物固体电解质的性能.

研究的目的:

研究在ASSB中使用固体电解质的LNMO阴极的界面限制.
探索提高LNMO在ASSB中的电化学稳定性和循环性能的策略.
为ASSB中稳定的高压阴极接口的开发提供指导.

主要方法:

分析LNMO与各种固体电解质 (Li6PS5Cl,Li3InCl6) 之间形成的介相.
在LNMO阴极上实施铁 (Fe) 和酸盐 (Li3PO4) 保护涂层.
在ASSB中对修改后的LNMO阴极进行电化学测试,在高电压下 (约. 4.7 V) 的情况.

主要成果:

内在的化学不相容性和低氧化稳定性被确定为LNMO与Li6PS5Cl的局限性.
甚至像Li3InCl6这样的稳定化物电解质也与LNMO形成了电阻界面.
用Li3InCl6对LNMO涂上Fe-doping和Li3PO4涂层,导致稳定的循环和在高电压下稳定的间相.

结论:

通过兴奋剂和保护性涂层进行接口工程对于使ASSB中的LNMO阴极稳定高压运行至关重要.
实现稳定的相间延长了电化学稳定性窗口,从而提高了循环性能.
这项工作为利用高压阴极提供了有价值的见解,并强调了在ASSB开发中界面稳定的重要性.

关键词:

所有固态电池都是固态电池.阴极是天主体,它们是天主体.电化学电化学电化学高压旋转螺纹的高压旋转螺纹.接口接口接口接口

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