Cao Guolin, Zhu Jie, Li Yunjiao, Zhou Yuan, Jin Zhuomin, Xu Bin, Hai Chunxi, Zeng Jinbo
School of Metallurgy and Environment, Central South University Changsha 410083 P. R. China
Qing Hai Kuai Lv High-tech Co., Ltd Xining 810008 P. R. China.
RSC Adv. 2020 Mar 9;10(17):9917-9923. doi: 10.1039/c9ra08450a. eCollection 2020 Mar 6.
Nickel-Cobalt-Aluminum (NCA) cathode materials for lithium-ion batteries (LIBs) are conventionally synthesized by chemical co-precipitation. However, the co-precipitation of Ni, Co, and Al is difficult to control because the three ions have different solubility product constants. This study proposes a new synthetic route of NCA, which allows fabrication of fine and well-constructed NCA cathode materials by a high temperature solid-state reaction assisted by a fast solvothermal process. The capacity of the LiNiCoAlO as-synthesized by the solvothermal method was 154.6 mA h g at 55 °C after 100 cycles, corresponding to 75.93% retention. In comparison, NCA prepared by the co-precipitation method delivered only 130.3 mA h g after 100 cycles, with a retention of 63.31%. Therefore, the fast solvothermal process-assisted high temperature solid-state method is a promising candidate for synthesizing high-performance NCA cathode materials.
用于锂离子电池（LIBs）的镍钴铝（NCA）阴极材料传统上是通过化学共沉淀法合成的。然而，镍、钴和铝的共沉淀难以控制，因为这三种离子具有不同的溶度积常数。本研究提出了一种新的NCA合成路线，该路线通过快速溶剂热过程辅助的高温固态反应，能够制备出精细且结构良好的NCA阴极材料。通过溶剂热法合成的LiNiCoAlO在55℃下经过100次循环后的容量为154.6 mA h/g，保留率为75.93%。相比之下，通过共沉淀法制备的NCA在100次循环后仅提供130.3 mA h/g，保留率为63.31%。因此，快速溶剂热过程辅助的高温固态法是合成高性能NCA阴极材料的一个有前途的候选方法。
