Ion Transport and Electrochemical Reaction in LiNi<sub>0.5</sub>Co<sub>0.2</sub>Mn<sub>0.3</sub>O<sub>2</sub>-Based High Energy/Power Lithium-Ion Batteries
oleh: Jinmei Xu, Jiandong Yang, Shaofei Wang, Jiangmin Jiang, Quanchao Zhuang, Xiangyun Qiu, Kai Wu, Honghe Zheng
| Format: | Article |
|---|---|
| Diterbitkan: | MDPI AG 2023-02-01 |
Deskripsi
The high energy/power lithium-ion battery using LiNi<sub>0.5</sub>Co<sub>0.2</sub>Mn<sub>0.3</sub>O<sub>2</sub> (NCM523 HEP LIB) has an excellent trade-off between specific capacity, cost, and stable thermal characteristics. However, it still brings a massive challenge for power improvement under low temperatures. Deeply understanding the electrode interface reaction mechanism is crucial to solving this problem. This work studies the impedance spectrum characteristics of commercial symmetric batteries under different states of charge (SOCs) and temperatures. The changing tendencies of the Li<sup>+</sup> diffusion resistance <i>R</i><sub>ion</sub> and charge transfer resistance <i>R</i><sub>ct</sub> with temperature and SOC are explored. Moreover, one quantitative parameter, § ≡ <i>R</i><sub>ct</sub>/<i>R</i><sub>ion</sub>, is introduced to identify the boundary conditions of the rate control step inside the porous electrode. This work points out the direction to design and improve performance for commercial HEP LIB with common temperature and charging range of users.