热失控
集电器
聚酰亚胺
材料科学
箔法
锂(药物)
阻燃剂
电流(流体)
消防安全
储能
离子
电池(电)
能量密度
核工程
电流密度
复合材料
汽车工程
电气工程
工程物理
电极
化学
工程类
量子力学
有机化学
图层(电子)
电解质
医学
功率(物理)
物理化学
土木工程
内分泌学
物理
作者
Yusheng Ye,Lien‐Yang Chou,Yayuan Liu,Hansen Wang,Hiang Kwee Lee,Wenxiao Huang,Jiayu Wan,Kai Liu,Guangmin Zhou,Yufei Yang,Ankun Yang,Xin Xiao,Xin Gao,David Boyle,Hao Chen,Wenbo Zhang,Sang Cheol Kim,Yi Cui
出处
期刊:Nature Energy
[Springer Nature]
日期:2020-10-15
卷期号:5 (10): 786-793
被引量:211
标识
DOI:10.1038/s41560-020-00702-8
摘要
Inactive components and safety hazards are two critical challenges in realizing high-energy lithium-ion batteries. Metal foil current collectors with high density are typically an integrated part of lithium-ion batteries yet deliver no capacity. Meanwhile, high-energy batteries can entail increased fire safety issues. Here we report a composite current collector design that simultaneously minimizes the ‘dead weight’ within the cell and improves fire safety. An ultralight polyimide-based current collector (9 μm thick, specific mass 1.54 mg cm−2) is prepared by sandwiching a polyimide embedded with triphenyl phosphate flame retardant between two superthin Cu layers (~500 nm). Compared to lithium-ion batteries assembled with the thinnest commercial metal foil current collectors (~6 µm), batteries equipped with our composite current collectors can realize a 16–26% improvement in specific energy and rapidly self-extinguish fires under extreme conditions such as short circuits and thermal runaway. Batteries need to be energy-dense as well as safe. Yi Cui and team develop an ultralight polyimide-based current collector with embedded fire retardants that enables lithium-ion batteries with much-enhanced safety and energy density.
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