在铜电流采集器上种植树般的铜,用于稳定的金属电池阳极
Junhao Wang1, Tonghao Zhou1, Yihang Li1
1School of Materials Science and Engineering, Xiangtan University, Xiangtan, Hunan 411105, China; National-Provincial Laboratory of Special Function Thin Film Materials, Xiangtan University, Xiangtan 411105, China.
Journal of colloid and interface science
|November 6, 2024
概括
研究人员开发了一种新型的树状铜电流收集器 (M-CF),以解决金属电池中的树增长问题. 这种仿生结构提高了沉积的稳定性和循环性能,为更安全,更高效的电池铺平了道路.
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:
- 在实际应用中,金属电池 (LMB) 面临着挑战,原因是循环过程中无法控制的树生长和体积变化.
- 传统的3D结构电流采集器经常表现出容易产生不均沉积的树突形态.
- 树突结构中的尖端效应导致局部化的电流密度和加速的树突形成.
研究的目的:
- 开发一种新的3D电流收集器结构,可以抑制树的生长.
- 优化沉积和剥离过程,以提高电池性能和寿命.
- 提高金属电池的安全性和实际可行性.
主要方法:
- 使用的聚烯酸 (PAA) 分子被吸附在铜表面上以控制电极沉积.
- 在铜 (M-CF) 上制造了一个仿生树状的铜结构,作为电流收集器.
- 研究了M-CF阳极在对称和全金属电池配置中的电化学性能.
主要成果:
- M-CF阳极在500个循环中表现出稳定的涂/剥离,平均高库伦比效率 (CE) 为98.1%.
- 带有M-CF阳极的对称电池实现了超过1600小时的稳定循环,电压歇斯底里 (11mV) 最少.
- 使用M-CF阳极和LTO阴极的全电池在500多个周期内表现出稳定的循环,容量保持率为95.3%.
结论:
- 仿生树般的铜结构有效地减轻了电场度,并优化了离子传输.
- M-CF阳极显著抑制了树的生长,提高了金属电池的循环稳定性和安全性.
- 这种方法为推进高性能金属电池的商业化提供了一个有前途的战略.
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