期刊
ACS APPLIED MATERIALS & INTERFACES
卷 14, 期 36, 页码 41103-41113出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.2c12497
关键词
HF scavengers; additives; H2O stabilizers; ionic liquid; LiPF6 based-electrolyte; lithium metal batteries
资金
- National Natural Science Foundation of China [21835005]
- Collaborative Innovation Center of Suzhou Nano Science and Technology
- Priority Academic Program Development of JiangsuHigher Education Institutions
In this study, a multifunctional ionic liquid-type additive IL-AC was proposed to adsorb trace moisture, prevent hydrolysis, and remove HF in the electrolyte. The addition of IL-AC significantly improved the capacity and stability of the batteries, providing a convenient and effective electrolyte treatment method.
The presence of trace amounts of moisture in the electrolyte can cause hydrolysis of LiPF6 and deteriorate the stability of lithium metal batteries. Herein, we propose a multifunctional ionic liquid-type additive constituting a 1-methyl-1-butyl pyrrolidium cation (Py14+) and an acetate anion (CH3COO-) (denoted as IL-AC in this study), which can effectively adsorb the trace moisture and thus prevent the hydrolysis of LiPF6 via intermolecular interactions. The prepared IL-AC can also remove HF to suppress the dissolution of transition metal ions from cathode materials through the reaction CH3COO- + HF -> CH3COOH + F-. Compared with the baseline electrolyte, the contents of HF and transition metal ions are significantly lower in the electrolyte with 0.5% IL-AC. Upon the addition of 0.5% IL-AC additive and 2500 ppm H2O, the Li|| NCM811 battery shows a capacity of 153.7 mAh g(-1) after 300 cycles, while the Li||LNMO battery possesses stable capacity retention of 93.22% after 500 cycles at 1C and a Coulombic efficiency greater than 99%. Thus, this work provides a convenient and effective method to absorb trace amounts of water and remove HF in the electrolyte and provides a new path for the expensive and tedious process of water removal from the electrolyte in industry.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据