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高速稳定金属阳极的固体电解质介面的度梯度辅助构造
Xiaofeng He1,2, Yanglansen Cui1, Yongchao Qian1
1Key Laboratory of Bio-inspired Materials and Interfacial Science, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China.
Journal of the American Chemical Society
|June 6, 2022
概括
这项研究引入了离子度梯度 (ACG) 辅助的固体电解质间相 (SEI),以防止可充电金属电池中的状物生长. 这项创新显著提高了金属阳极的稳定性和循环寿命.
科学领域:
- 材料科学
- 电化学
- 能量储存
背景情况:
- 可充电金属电池面临着树突生长和副作用的挑战,限制了库伦效率 (CE) 和循环寿命.
- ,和等金属阳极特别容易出现这些问题.
- 开发稳定的固体电解质界面 (SEI) 对于提高电池性能至关重要.
研究的目的:
- 提出并展示一种用于金属阳极的离子度梯度 (ACG) 辅助SEI的新概念.
- 增强离子导电性,抑制可充电金属电池中的树生长和副作用.
- 提高基于的储能装置的循环稳定性和整体性能.
主要方法:
- 通过硫酸聚合物和 (Zn) 金属之间的现场化学反应制造ACG-SEI层.
- 利用硫酸盐度梯度的驱动力来促进Zn2+离子导电性.
- 研究SEI层内抑制的离子扩散对树突抑制的影响.
主要成果:
- 在高电流密度 (20 mA cm-2) 和容量 (5 mAh cm-2) 的Zn/Zn对称电池中经过2000多小时的稳定/剥离.
- 显著抑制了Zn金属阳极上的树生长和副作用.
- 在Zn/MnO2全电池和Zn/AC超级电容器中观察到更好的循环稳定性.
结论:
- 该ACG-SEI有效地促进Zn2+离子导电性,并抑制离子扩散,从而导致无树脂和稳定的金属阳极循环.
- 这种方法为了解离子/剥离机制提供了新的视角.
- 开发的SEI技术为在实际条件下提高性能的先进的可充电金属电池铺平了道路.
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