Holoubek John, Yin Yijie, Li Mingqian, Yu Mingyu, Meng Ying Shirley, Liu Ping, Chen Zheng
Department of NanoEngineering, University of California, San Diego, La Jolla, CA, 92093, USA.
Program of Materials Science, University of California, San Diego, La Jolla, CA, 92093, USA.
Angew Chem Int Ed Engl. 2019 Dec 19;58(52):18892-18897. doi: 10.1002/anie.201912167. Epub 2019 Nov 11.
Improving the extremely low temperature operation of rechargeable batteries is vital to the operation of electronics in extreme environments, where systems capable of high-rate discharge are in short supply. Herein, we demonstrate the holistic design of dual-graphite batteries, which circumvent the sluggish ion-desolvation process found in typical lithium-ion batteries during discharge. These batteries were enabled by a novel electrolyte, which simultaneously provides high electrochemical stability and ionic conductivity at low temperature. The dual-graphite cells, when compared to industry-type graphite ∥ LiCoO full-cells demonstrated an 11 times increased capacity retention at -60 °C for a 10 C discharge rate, indicative of the superior kinetics of the "dual-ion" storage mechanism. These trends are further supported by galvanostatic intermittent titration technique (GITT) and electrochemical impedance spectroscopy (EIS) measurements at reduced temperature. This work provides a new design strategy for extreme low-temperature batteries.
提高可充电电池的超低温性能对于极端环境下电子设备的运行至关重要，在这种极端环境中，能够进行高倍率放电的系统供应短缺。在此，我们展示了双石墨电池的整体设计，它规避了典型锂离子电池在放电过程中缓慢的离子去溶剂化过程。这些电池由一种新型电解质实现，该电解质在低温下同时提供高电化学稳定性和离子导电性。与工业型石墨∥LiCoO全电池相比，双石墨电池在-60°C下以10C放电率时容量保持率提高了11倍，这表明“双离子”存储机制具有卓越的动力学性能。恒电流间歇滴定技术（GITT）和低温下的电化学阻抗谱（EIS）测量进一步支持了这些趋势。这项工作为极低温电池提供了一种新的设计策略。
