Thermal Stability of High Power 26650-Type Cylindrical Na-Ion Batteries
Quan Zhou1,2, Yuqi Li1,2, Fei Tang3, Kaixuan Li3, Xiaohui Rong1,2, Yaxiang Lu1,2*, Liquan Chen1,2, and Yong-Sheng Hu1,2,3*
1Key Laboratory for Renewable Energy, Beijing Key Laboratory for New Energy Materials and Devices, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China 2Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China 3HiNa Battery Technology Co., Ltd, Beijing 100194, China
Abstract：As a new electrochemical power system, safety (especially thermal safety) of Na-ion batteries (NIBs) is the key towards large-scale industrialization and market application. Thus, research on the thermal stability of NIBs is helpful to evaluate the safety properties and to provide effective strategies to prevent the occurrence of battery safety failure. Thermal stability of the high-power 26650 cylindrical NIBs using Cu-based layered oxide cathode and hard carbon anode is studied. The high power NIBs can achieve fast charge and discharge at 5–10 C rate and maintain 80% capacity after 4729 cycles at 2 C/2 C rate, where the unit C denotes a measure of the rate at which a battery is charge-discharged relative to its maximum capacity. The results of accelerating rate calorimeter and differential scanning calorimetry (ARC-DSC) test results show that NIBs have a higher initial decomposition temperature ($\ge$110 ℃) and a lower maximum thermal runaway temperature ($\le $350 ℃) than those of Li-ion batteries (LIBs), exhibiting a favorable thermal stability. It should be noted that the heat generation of cathode accounts for a large proportion of the total heat generation while the thermal stability of the anode determines the initial thermal runaway temperature, which is similar to LIBs. Finally, the whole temperature characteristics of the NIBs in the range of $-60 $ ℃–1000 ℃ are summarized, which provide guidance for the safety design and applications of NIBs.
Feng X, Zhen S, Ren D, He X, Wang L, Cui H, Liu X, Jin C, Zhang F, Xu C, Hsu H, Gao S, Chen T, Li Y, Wang T, Wang H, Li M, and Ouyang M 2019 Appl. Energy246 53
2021, Vol. 38 
