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脉冲电荷通过快速补充阳极表面的离子来抑制低温的树生长
Ke-Feng Ren1, He Liu1, Jia-Xin Guo2
1Institute of Advanced Materials and Flexible Electronics (IAMFE), School of Chemistry and Materials Science, Nanjing University of Information Science and Technology, Nanjing, Jiangsu, 210044, China.
ChemSusChem
|August 25, 2024
概括
脉冲充电与休息时间有效地抑制了在低温下金属阳极中的树脂的生长. 这一策略通过在休息阶段补充离子来提高电池寿命和稳定性.
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:
- 金属阳极具有高能量密度,但受到状物生长的影响,特别是在低温下.
- 在低温下较差的离子扩散动力学加剧了树岩的形成,限制了电池的性能和安全性.
研究的目的:
- 提出和研究一个脉冲充电策略与间歇性休息时间,以减轻树突的生长.
- 为了提高在低温下工作的金属电池的稳定性和寿命.
主要方法:
- 在电池循环期间实施脉冲充电协议,间隔休息时间.
- 在休息阶段分析电极/电解质接口上的离子补充动态.
- 评估离子核化阶段的树抑制.
主要成果:
- 脉冲充电与休息显著抑制在低温 (-10°C) 的树状石的形成.
- 在特定的循环条件下,Li HDD Li电池的使用寿命从24小时增加到64个相当的小时.
- 立体电池LiNi0.5Co0.2Mn0.3O2电池的循环寿命有所改善,稳定运行时间从39个循环延长到56个循环,容量保持80%.
结论:
- 脉冲充电与间歇性休息是控制金属阳极沉积的有效策略.
- 这种方法促进了无树的金属阳极形态,提高了电池的性能和在低温下安全.
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