缓解表面不可逆转的层到脊柱相位过渡,用于稳定和超高容量的LiCoO2阴极
Haocong Yi1, Wenguang Zhao1, Yutong Lin2
1School of Advanced Materials, Peking University Shenzhen Graduate School, Shenzhen, 518055, China.
Small (Weinheim an der Bergstrasse, Germany)
|October 31, 2025
概括
这项研究引入了双优化的氧化 (LCO) 阴极,具有表面和地下修改. 这种方法提高了稳定性,并为先进的电池应用解锁了超高容量.
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:
- 超高容量的氧化 (LCO) 阴极因表面结构崩而面临挑战.
- 这阻碍了它们在高性能储能设备中的实际应用.
研究的目的:
- 开发一个双优化的LCO (D-LCO) 结构,以提高稳定性和容量.
- 调查协调的地下和表面修改在稳定LCO阴极中的作用.
主要方法:
- 用表面岩石盐 (RS) 阶段和地下层级阶段制造D-LCO.
- 将Al/F兴奋剂纳入地下区域以抑制离子迁移.
- 电化学测试用于评估容量,循环稳定性和电压性能.
主要成果:
- D-LCO 在4.6 V的电压下实现了236 mAh g-1的超高容量,而 Li+/Li.
- 证明了卓越的循环稳定性:在1C的200个循环后保持90.3%,在4C的1000个循环后保持81.2%.
- 表面下的Al/F兴奋剂有效地抑制了晶格氧气迁移,并防止了不必要的相位过渡.
结论:
- 协调地底和地表稳定对于释放分层氧化物阴极的全部潜力至关重要.
- 该D-LCO战略为开发下一代高能量密度电池提供了一条道路.
- 这项研究解决了储能LCO阴极技术的关键局限性.
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