热失控
电解质
石墨
化学工程
相间
材料科学
热稳定性
电极
能量密度
化学
复合材料
工程物理
热力学
物理化学
电池(电)
物理
工程类
功率(物理)
生物
遗传学
作者
Yu Wu,Xuning Feng,Min Yang,Chen-Zi Zhao,Xiang Liu,Dongsheng Ren,Zhuang Ma,Languang Lu,Li Wang,Gui-Liang Xu,Xiangming He,Khalil Amine,Minggao Ouyang
标识
DOI:10.1002/advs.202204059
摘要
With continuous improvement of batteries in energy density, enhancing their safety is becoming increasingly urgent. Herein, practical high energy density LiNi0.8 Mn0.1 Co0.1 O2 |graphite-SiO pouch cell with nonflammable localized high concentration electrolyte (LHCE) is proposed that presents unique self-discharge characteristic before thermal runaway (TR), thus effectively reducing safety hazards. Compared with the reference electrolyte, pouch cell with nonflammable LHCE can increase self-generated heat temperature by 4.4 °C, increase TR triggering temperature by 47.3 °C, decrease the TR highest temperature by 71.8 °C, and extend the time from self-generated heat to triggering TR by ≈8 h. In addition, the cell with nonflammable LHCE presents superior high voltage cycle stability, attributed to the formation of robust inorganic-rich electrode-electrolyte interphase. The strategy represents a pivotal step forward for practical high energy and high safety batteries.
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