接表面的表轴层使所有固态硫化电池具有高负载
Zhuomin Qiang1, Yanbin Ning1, Wei Zhao1
1State Key Laboratory of Space Power-Sources, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China.
Science bulletin
|November 6, 2025
概括
我们在硫化物全固态电池中稳定了高阴极,使用现场的氧化涂层. 这种表面工程方法可以防止副作用和结构损坏,提高电池性能和寿命.
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
- 电池技术 电池技术
背景情况:
- 超高层氧化物阴极 (例如,LiNi0.9Co0.05Mn0.05O2或NCM90) 具有高能量密度,但在硫化物全固态电池 (ASSLB) 中存在表面反应性和应变问题.
- 这些挑战导致界面不稳定性和结构退化,限制了ASSLB中高能量密度阴极的实际应用.
研究的目的:
- 开发超高层氧化物阴极的有效表面修改策略,以提高它们在硫化物ASSLB中的稳定性和电化学性能.
- 调查拟议的表面处理减轻界面副作用和结构疲劳的机制.
主要方法:
- 使用氧化 (In2O3) 的现场转换策略用于处理NCM90阴极表面.
- 使用先进技术进行了对待的阴极的特征,包括同步龙X射线断层扫描 (微/纳米CT) 和X射线吸收近边缘结构 (XANES).
- 电化学性能被评估在硫化物ASSLBs与高阴极负荷 (9毫克厘米-2).
主要成果:
- 在现场的氧化处理成功捕获了剩余的杂质,并重建了接近表面的结构,形成了一个符合形状的表轴层.
- 这种重建的层有效地抑制了阴极-电解质接口上的自发副作用反应,并防止了大量的结构疲劳.
- 在ASSLB中修改后的NCM90阴极实现了高可逆容量~2 mAh cm−2 (>190 mAh g−1在0.069 mA cm−2),卓越的循环稳定性和良好的速率能力.
- 多个尺度的观测证实显著缓解了界面不稳定性和化学机械分解.
结论:
- 通过现场的氧化转换进行表面工程是稳定超高层阴极的关键策略.
- 这种方法提高了ASSLB的电化学性能和循环稳定性,为高能量密度应用铺平了道路.
- 这些发现强调了解决接口现象对于下一代固态电池的发展的重要性.
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