锂(药物)
离子
扩散
材料科学
化学
热力学
物理
有机化学
医学
内分泌学
作者
Qiu Chen,Pan Luo,Li Liao,Yin Shen,Xiaoshuang Luo,Xinpeng Li,Xinpeng Li,Xuanzhong Wen,Jialin Song,Bo Yu,Junchen Chen,Bingshu Guo,Mingshan Wang,Mingshan Wang,Yun Huang,Fuliang Liu,Jiangtao Liu,Jiangtao Liu,Z.J. Li,Jingrun Ma
标识
DOI:10.1002/batt.202400246
摘要
Abstract Electrolyte design is the optimal strategy to achieve extremely low temperature operation of lithium‐ion batteries. Here, the diffusion coefficient of Li + is proposed to improve the ion transport kinetics at low temperatures. The diffusion coefficient of Li + is improved by constructing a Li + solvation sheath with weak steric effects. Specifically, high binding energy BF 4 − anions are added to a 1 M LiPF 6 in propyl acetate ( PA ) electrolyte. Since the binding energy of Li + with BF 4 − is greater than that of PA. Therefore, the small‐sized BF 4 − replaces the large‐sized PA molecule to form a Li + solvation sheath with a weak steric effect, which increases the diffusion coefficient of Li + . Using the high diffusion coefficient electrolyte, the 800 mAh pouch cell retain 91 % and 75 % of its room temperature capacity at −40 °C(0.5 C rate) and −60 °C (0.2 C rate), respectively. And it also shows stable cycling at −40 °C. This work provides a new strategy for designing low‐temperature electrolytes of lithium‐ion batteries.
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