Li+-Desolvation Dictating Lithium-Ion Battery Low-Temperature Performances.

Lithium (Li) ion battery (LIB) has penetrated almost every aspects of human life, from portable electronics, vehicles to grids, and its operation stability in extreme environments becomes increasingly important. Among these, sub-zero temperature presents a kinetic challenge to the electrochemical reactions required to deliver the stored energy. In this work, we attempted to identify the rate-determining process for Li+ migration under such low temperatures, so that an optimum electrolyte formulation could be designed to maximize the energy output. Substantial increase in available capacities from graphite||LiNi0.80Co0.15Al0.05O2 chemistry down to -40°C is achieved by reducing the solvent molecule that more tightly binds to Li+ and thus constitutes high desolvation energy barrier. The fundamental understanding is applicable universally to a wide spectrum of electrochemical devices that have to operate in similar environments.

Citation

Qiuyan Li, Dongping Lu, Jianming Zheng, Shuhong Jiao, Langli Luo, Chongmin Wang, Kang Xu, Ji-Guang Zhang, Wu Xu. Li+-Desolvation Dictating Lithium-Ion Battery Low-Temperature Performances. ACS applied materials & interfaces. 2017 Nov 17

PMID: 29148705

search → result