梯度准固体电解质使强大的水性离子电池能够选择性和快速的离子运输
Yanglansen Cui1, Weipeng Chen1, Weiwen Xin1,2
1CAS Key Laboratory of Bio-inspired Materials and Interfacial Science, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China.
Advanced materials (Deerfield Beach, Fla.)
|November 3, 2023
概括
梯度水凝网络 (GHNs) 通过增强离子运输和稳定性来提高电池性能. 这种不对称的工程策略有效地抑制了树的生长,以获得更安全,更高能量的准固态电池.
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
- 聚合物化学 聚合物化学
背景情况:
- 准固体电解质 (QSEs) 提供增强的离子运输和稳定性,由于可调节的功能组和聚合物网络内的受限溶剂分子.
- 质量测试的一个关键挑战是聚合物含量和离子导电性之间的权衡,这限制了电池的速度性能.
- 开发先进的QSE对于高能耗和安全的下一代电池系统至关重要.
研究的目的:
- 通过使用表轴聚合策略,对阳极进行共价固定的梯度水凝网络 (GHN) 的设计.
- 研究GHN中不对称的电荷分布对离子 (Zn2+) 传输特性的影响.
- 评估GHN抑制水参与的寄生反应和电池中的树生长的能力.
主要方法:
- 在阳极上构建梯度水凝网络 (GHN) 的表轴聚合.
- 在GHN和同质水凝网络 (HHN) 之间对Zn2+转移数进行比较分析.
- 评估对象细胞和完整细胞中的树突抑制和循环稳定性.
主要成果:
- GHN的电荷分布不对称,导致更快,更有选择性的Zn2+运输,转移数为0.65,而HHN的转移数为0.52.
- 在Zn/GHNs接口的高密度网络有效地固定水,并使Zn2+流同质化,抑制寄生反应.
- 在对称细胞中,在8 mA cm-2和1 mAh cm-2的电压下,在1000多个小时内实现了无树的Zn剥离/涂层,在完整细胞中显著提高了循环性能.
结论:
- 通过GHN进行离子运输通道的不对称工程是一种可行的策略,可以克服传统QSE的局限性.
- 开发的GHN增强了准固态电池的离子导电性,稳定性和安全性.
- 这种方法为开发高能耗和安全的先进电池系统提供了途径.
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