从最初没有阳极的全固态电池的Li-argyrodite电解质中取出银溶液.
Seung Ho Choi1, Chang Hoon Baek2,3, Jihoon Oh4
1Advanced Batteries Research Center, Korea Electronics Technology Institute, Seongnam, Republic of Korea. sh.choi@keti.re.kr.
Nature communications
|July 2, 2025
概括
这项研究引入了一种-阿吉罗电解质,用于无阳极全固态电池. 它可以实现统一的涂层和剥离,增强电池的稳定性和能量密度.
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:
- 全固态电池 (ASSB) 提供了更高的安全性,但在实现稳定的循环中面临着挑战,特别是在无阳极配置中.
- 不统一的 (de) 涂装仍然是一个关键问题,阻碍了在操作条件下的实际应用.
研究的目的:
- 制定一项战略,在最初没有阳极的ASSB中实现统一的沉积和剥离.
- 为了提高基于 argyrodite 的固态电池的循环利用性和能量密度.
主要方法:
- 设计了一种双层电解质,由一层含银 (Ag) 杂的Li-argyrodite层相邻一层未含杂的Li-argyrodite层组成.
- 从化层中电化学溶解Ag+被用来形成性银种子.
- 这些种子促进了统一的涂层,并在剥离后返回电解质.
主要成果:
- 银种子诱导了统一的涂层和剥离,显著提高了循环过程中的可逆性.
- 一个袋式的全电池实现了1312Wh/L的体积能量密度和7.0 mAh/cm2的面积放电容量,0.7 mA/cm2.
- 在2.0MPa的实用堆压力下,稳定的循环被证明是可行的.
结论:
- 在Li-argyrodite固体电解质中电化学溶解Ag+是强大的高能量密度最初无阳极的ASSB的有效策略.
- 开发的双层电解质促进了稳定的金属循环,克服了当前ASSB技术的主要局限性.
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