Concentrated Electrolytes Widen the Operating Temperature Range of Lithium-Ion Batteries,Advanced Science

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Concentrated Electrolytes Widen the Operating Temperature Range of Lithium-Ion Batteries
Advanced Science ( IF 14.3 ) Pub Date : 2021-07-23 , DOI: 10.1002/advs.202101646
Jianhui Wang ₁ , Qifeng Zheng ₂ , Mingming Fang ₁ , Seongjae Ko _{3,

4} , Yuki Yamada _{3,

4} , Atsuo Yamada _{3,

4}

Affiliation

The operating temperatures of commercial lithium-ion batteries (LIBs) are generally restricted to a narrow range of −20 to 55 °C because the electrolyte is composed of highly volatile and flammable organic solvents and thermally unstable salts. Herein, the use of concentrated electrolytes is proposed to widen the operating temperature to −20 to 100 °C. It is demonstrated that a 4.0 mol L⁻¹ LiN(SO₂F)₂/dimethyl carbonate electrolyte enables the stable charge–discharge cycling of a graphite anode and a high-capacity LiNi_0.6Co_0.2Mn_0.2O₂ cathode and the corresponding full cell in a wide temperature range from −20 to 100 °C owing to the highly thermal stable solvation structure of the concentrated electrolyte together with the robust and Li⁺-conductive passivation interphase it offered that alleviate various challenges at high temperatures. This work demonstrates the potential for the development of safe LIBs without the need for bulky and heavy thermal management systems, thus significantly increasing the overall energy density.

中文翻译：

浓缩电解液拓宽锂离子电池的工作温度范围

商用锂离子电池 (LIB) 的工作温度通常限制在 -20 至 55 °C 的狭窄范围内，因为电解质由高度挥发性和易燃的有机溶剂和热不稳定的盐组成。在此，建议使用浓缩电解质将工作温度扩大到 -20 至 100°C。结果表明，4.0 mol L ^-1 LiN(SO ₂ F) ₂ /碳酸二甲酯电解质可实现石墨负极和高容量LiNi _0.6 Co _0.2 Mn _0.2 O ₂的稳定充放电循环阴极和相应的全电池在 -20 至 100 °C 的宽温度范围内，由于浓缩电解质的高度热稳定溶剂化结构以及它提供的坚固和 Li ⁺导电钝化界面，缓解了高温下的各种挑战. 这项工作证明了开发安全 LIB 的潜力，而无需笨重的热管理系统，从而显着提高整体能量密度。

更新日期：2021-09-22

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