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糖衍生物的分子工程作为电解质添加剂,用于深度可逆Zn金属阳极
Min Shi1, Chengjun Lei1, Huijian Wang1
1State Key Laboratory of Chem/Biosensing and Chemometrics, Joint International Research Laboratory of Energy Electrochemistry, College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, China.
Angewandte Chemie (International ed. in English)
|June 6, 2024
概括
乳酸 (LA) 添加剂通过抑制树形成和副作用来提高离子电池的性能. 这种分子设计提高了循环稳定性和库伦比效率,即使在恶劣的条件下.
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
- 化学工程是化学工程的重要组成部分.
背景情况:
- 离子电池面临着岩形成和副作用反应的挑战,影响循环性能,特别是在高放电深度 (DOD) 和低负/正容量 (N/P) 比率下.
- 主机-客人相互作用化学原理为设计电解质添加剂提供了一条途径,可以减轻这些问题.
研究的目的:
- 研究电解质添加剂的分子结构,特别是 -COOH和 -OH 群对阳极的影响.
- 通过添加剂的分子设计,提高离子电池的稳定性和可逆性.
主要方法:
- 基于宿主-客人相互作用化学的电解质添加剂的分子设计.
- 对阳极表面的添加剂吸附和用 Zn2+进行合的研究.
- 离子电池的电化学性能测试,在各种条件下使用或不使用添加剂.
主要成果:
- 具有-COOH和-OH组的分子强烈吸附到阳极上,形成一个H2O-poor内赫尔姆霍尔茨平面.
- 乳酸 (LA) 添加剂促进了无树的沉积,并增强了稳定性,达到99.89%的平均效率.
- 经LA修改的细胞在92%的DOD和15mA·cm-2时显示出稳定的循环,在全细胞中保持高容量,并在静电电池中改善循环.
结论:
- 具有特定功能组的电解质添加剂,如LA,可以有效地抑制阳极上的树突形成和副作用.
- 利用主机-客户互动的分子设计是改善离子电池性能和寿命的有希望的策略.
- 酸添加剂在提高各种基电池系统的循环稳定性和效率方面具有显著的潜力.
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