分离器(采油)
电解质
材料科学
水溶液
化学工程
离子
电池(电)
锂(药物)
储能
聚合
化学
有机化学
电极
复合材料
聚合物
功率(物理)
量子力学
医学
物理化学
内分泌学
工程类
物理
热力学
作者
Yuewang Yang,Zhaowen Bai,Sijing Liu,Yinggang Zhu,Jiongzhi Zheng,Guohua Chen,Baoling Huang
出处
期刊:Cornell University - arXiv
日期:2022-01-01
标识
DOI:10.48550/arxiv.2203.09152
摘要
Capacity degradation and destructive hazards are two core challenges for lithium-ion batteries at high temperatures, which need to be solved urgently. Adding flame retardants or fire extinguishing agents can only achieve one-time self-protection in case of emergency overheating. Herein, smart self-protecting aqueous lithium-ion batteries were developed using thermoresponsive separators through in-situ polymerization on the hydrophilic separator. The thermoresponsive separator will close the lithium ions transport channel at high temperatures and reopen when the battery cools down; more importantly, the transition is reversible. We studied the lithium salts influence on the thermoresponsive properties of the hydrogels and selected suitable lithium salt (LiNO3) and concentration (1 M) in the electrolyte to achieve self-protection without sacrificing battery performance. In addition, the shut-off temperature can be tuned by adjusting the hydrophilic and hydrophobic moiety ratio in the hydrogel according to actual demands. This self-protecting lithium-ion battery shows promise for smart energy storage devices with safe and extended lifespan.
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