Yang Yusi, Chen Yifan, Tan Lulu, Zhang Jianwen, Li Nan, Ji Xiao, Zhu Yujie
School of Chemistry, Beihang University, Beijing, 100191, China.
School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China.
Angew Chem Int Ed Engl. 2022 Oct 17;61(42):e202209619. doi: 10.1002/anie.202209619. Epub 2022 Sep 12.
The rechargeability of contemporary lithium-ion batteries (LIBs) is challenging at low temperatures, mainly due to the hurdles faced by graphite anodes. Herein, by exploiting the Li-solvent co-intercalation into graphite, its low-temperature rechargeability is boosted. Experimental characterizations aided by theoretical calculations demonstrate that the co-intercalation process is featured by low interfacial resistance with a small charge transfer activation energy (0.23 eV atom ) and an extremely low diffusion energy barrier (0.09 eV atom ) which leads to nearly temperature-independent diffusion coefficients of the solvated Li-ion in graphite, enabling graphite to be stably charged-discharged at -60 °C with 73.7 % of its room-temperature capacity. Consequently, the full-cell consisting of a LiNi Co Mn O cathode and a graphite anode shows impressive rechargeability under -60 °C. This work provides an alternative approach to develop low-temperature rechargeable LIBs.
当代锂离子电池（LIBs）的可充电性在低温下具有挑战性，主要是由于石墨阳极面临的障碍。在此，通过利用锂 - 溶剂共嵌入石墨，其低温可充电性得到了提高。理论计算辅助的实验表征表明，共嵌入过程的特点是界面电阻低，电荷转移活化能小（0.23 eV/原子），扩散能垒极低（0.09 eV/原子），这导致溶剂化锂离子在石墨中的扩散系数几乎与温度无关，使得石墨能够在-60°C下稳定充放电，保持其室温容量的73.7%。因此，由LiNiCoMnO阴极和石墨阳极组成的全电池在-60°C下表现出令人印象深刻的可充电性。这项工作为开发低温可充电锂离子电池提供了一种替代方法。
