通过针对性的化学反应,提高超高阴极与以PEO为基础的电解质的界面稳定性
Yuqing Dai1, Zihan Hou1, Gui Luo2
1Engineering Research Center of the Ministry of Education for Advanced Battery Materials, Hunan Provincial Key Laboratory of Nonferrous Value-Added Metallurgy, School of Metallurgy and Environment, Central South University Changsha 410083 China wangjiexikeen@csu.edu.cn.
Chemical science
|August 16, 2024
概括
研究人员使用剩余的和酸开发了一种用于固态电池的新型接口涂层. 这种涂层提高了超高阴极电池的稳定性和电化学性能,改善了储能解决方案.
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:
- 超高正极材料提供高能量密度,而以PEO为基础的电解质在固态电池 (SLMB) 中提供安全性.
- 这些组件之间的界面不兼容导致副作用,阻碍了SLMB的性能.
- 有效的阴极/电解质接口修改对于推进SLMB技术至关重要.
研究的目的:
- 解决基于PEO的超高SLMB的接口挑战.
- 开发一个稳定和导电的接口涂层层.
- 提高SLMB的电化学性能和循环寿命.
主要方法:
- 在LiNi0.9Co0.06Mn0.04O2 (NCM) 阴极材料上使用剩余.
- 与H3BO3反应的剩余形成一个in situ xLi2O-B2O3 (LBO1-NCM) 涂层.
- 制造一个全固态三电极电池,以验证接口稳定和电化学性能.
主要成果:
- 在现场形成的LBO1-NCM涂层表现出高离子导电性和可调节的晶体结构.
- LBO1-NCM涂层有效地稳定了阴极/电解质接口,抑制了侧面反应.
- 该涂层减轻了由PEO分子链断裂引起的不均的阳极沉积.
- 硬币电池在100个循环后保持了90.5%的容量,袋式电池在200个循环后保持了80.3%.
结论:
- 针对性的界面修改与SLMB电解质优化一样重要.
- 开发的xLi2O-B2O3涂层为提高SLMB性能提供了一个有希望的策略.
- 这种方法显著提高了基于超高PEO的SLMB的稳定性和周期寿命.
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