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用三维惰性转移大来抑制 Zn 粉碎化,用于长寿命的 Zn 金属电池

Xuelong Liao¹, Shan Chen¹, Jialei Chen¹

¹Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Renewable Energy Conversion and Storage Center, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), College of Chemistry, Nankai University, Tianjin 300071, China.

Proceedings of the National Academy of Sciences of the United States of America

|February 12, 2024

概括

在电池中被忽视的问题是粉碎,通过引入EMIm+电离子来解决这个问题. 这项创新促进了均的沉积,提高了电池的性能和寿命.

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:

与水相关的副作用和 (Zn) 树突的生长是已有充分研究的电极-电解质接口问题.
粉碎,导致活跃的 Zn 枯竭和进化,是一个关键但被忽视的问题.
过度的 Zn 养和不完全的结晶被确定为 Zn 粉碎化的原因.

研究的目的:

为了研究沉积过程中粉碎背后的机制.
制定一种策略,以防止Zn粉碎,并提高金属阳极的稳定性.
为了提高基电池的性能和循环寿命.

主要方法:

沉积过程的热力学和动力学分析.
在电解质中引入1-乙基-3-甲基利米达酸 (EMIm+),以形成3D惰性酸 (3DIC) 区域.
电化学测试,包括对称细胞测试和袋细胞循环.
计算建模分析Zn2+流量分布.

主要成果:

EMIm+离子创造了一个3DIC区域,诱导Zn2+流量的高斯分布.
这个3DIC区域缓冲垂直扩散,并指导Zn2+的横向扩散,防止局部积累和不可逆转的晶体形成.
实现了抗粉碎Zn金属沉积,平均99.6%的库伦比效率超过2000个周期在5mA cm-2.
在对称细胞中观察到在-30°C下1200小时的异常稳定性.
在2A g-1的2A g-1中,A Zn coproduced KVOH袋式电池在1200个循环中表现出稳定的循环运行,其保留容量为12 mAh.

结论:

由EMIm+形成的3DIC区域通过控制沉积动力学和热力学,有效地抑制了的粉碎化.
这种方法显著提高了金属阳极的库伦比克效率,循环寿命和低温稳定性.
这些发现为开发高性能和可靠的电池提供了有前途的战略.

关键词:

3D惰性阴离子丰富区域金属电池金属电池在Zn粉末化过程中.结晶性结晶性是指结晶性.长期可逆性的长期可逆性

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