Shen Yabin, Xue Hongjin, Wang Shaohua, Wang Zhaomin, Zhang Dongyu, Yin Dongming, Wang Limin, Cheng Yong
State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, PR China; School of Applied Chemistry and Engineering, University of Science and Technology of China (USTC), Hefei 230026, PR China.
State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, PR China.
J Colloid Interface Sci. 2021 Sep;597:334-344. doi: 10.1016/j.jcis.2021.04.008. Epub 2021 Apr 8.
Reducing cobalt dependency has attracted great interest for lithium batteries manufacturing due to limited cobalt resources and high prices. A highly promising LiNiCoMnO (NCM60535) high-nickel low cobalt lithium layered oxide cathode material is successfully prepared by systematically examining the two key synthesis conditions of pH and annealing temperature. The obtained materials exhibit a uniform size distribution, good spherical morphology, clear structure, and homogeneous element distribution. NCM60535 shows competitive electrochemical properties: when compared with the LiNiCoMnO, with a higher output specific capacity and cycling stability at 4.3 V low voltage; when compared with the LiNiCoMnO, with a comparable discharge capacity but relatively poor cycling stability at 4.5 V high voltage. A new type of electrolyte that combines high lithium salt concentration, EC-free solvent system, and VC and LiPOF functional additives is designed and greatly improves the electrochemical properties of the material under high voltage. Moreover, it also delivers superior electrochemical properties in high voltage lithium full battery (270 Wh Kg). And we suggest that NCM60535 is expected to become a substitute for the currently widely commercialized LiNiCoMnO (NCM333), LiNiCoMnO (NCM523), LiNiCoMnO (NCM622), and LiNiCoMnO (NCM811) due to its relatively low production cost and competitive electrochemical properties.
由于钴资源有限且价格高昂，降低钴依赖性在锂电池制造领域引起了极大关注。通过系统研究pH值和退火温度这两个关键合成条件，成功制备出一种极具潜力的LiNiCoMnO（NCM60535）高镍低钴锂层状氧化物正极材料。所获得的材料呈现出均匀的尺寸分布、良好的球形形态、清晰的结构以及均匀的元素分布。NCM60535展现出具有竞争力的电化学性能：与LiNiCoMnO相比，在4.3V低电压下具有更高的输出比容量和循环稳定性；与LiNiCoMnO相比，在4.5V高电压下具有相当的放电容量，但循环稳定性相对较差。设计了一种新型电解质，其结合了高锂盐浓度、无EC溶剂体系以及VC和LiPOF功能添加剂，极大地改善了该材料在高电压下的电化学性能。此外，它在高电压锂全电池（270 Wh Kg）中也表现出优异的电化学性能。并且我们认为，由于NCM60535生产成本相对较低且具有竞争力的电化学性能，有望成为目前广泛商业化的LiNiCoMnO（NCM333）、LiNiCoMnO（NCM523）、LiNiCoMnO（NCM622）和LiNiCoMnO（NCM811）的替代品。
