电压诱导的化物再氧化使快充电池的容量恢复成为可能
Mengting Zheng1,2,3, Tiefeng Liu1,3, Jiawei Wu4
1College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, Zhejiang Province, 310027, China.
Advanced materials (Deerfield Beach, Fla.)
|December 21, 2024
概括
快速充电的离子电池由于涂层而损失容量. 一种新的电压激活化物方法有效地恢复了电池容量,提高了电动汽车的耐用性.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 储能 储能 储能 储能 储能 储能
背景情况:
- 快速充电的离子电池 (LIB) 对电动汽车 (EV) 至关重要,但快速降低容量限制了它们的实用性.
- 石墨阳极上的涂层和随后的Li2O物种的被动化导致快充LIB的显著容量色和充电能力差.
研究的目的:
- 为了解决快速充电LIB的容量衰减和充电能力不佳的问题.
- 为被动化石墨阳极开发一种新的现场激活机制.
主要方法:
- 开发了一种电压诱导激活策略,使用添加到电解质中的化 (LiBr) 的化 (Br-/Br3-) 氧化还原对.
- 切断电压被精确控制,以优化氧还原对在激活Li2O和死亡Li0.0中的有效性.
- 退化的快充电池经历了这种激活过程.
主要成果:
- 激活过程显著恢复了退化的快速充电电池的容量,从低于30 mAh g-1到大约118 mAh g-1.
- 即使在第二轮快速充电后,激活方法也被证明是有效的,恢复可逆容量到大约100 mAh g-1.
- 这表明了重复恢复产能的潜力.
结论:
- 开发的电压介导氧还原对激活机制有效地恢复LIBs中的被动化石墨阳极.
- 这种方法提供了一个可持续的解决方案,可以延长实际快速充电电池的使用寿命,提高其耐用性和经济可行性.
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