Compound-Hierarchical-Sphere LiNi0.5Co0.2Mn0.3O2: Synthesis, Structure, and Electrochemical Characterization

Lecai Wang; Li Li; Xiaoxiao Zhang; Feng Wu; Renjie Chen

doi:10.1021/acsami.8b09985

Compound-Hierarchical-Sphere LiNi_0.5Co_0.2Mn_0.3O₂: Synthesis, Structure, and Electrochemical Characterization

ACS Appl Mater Interfaces. 2018 Sep 26;10(38):32120-32127. doi: 10.1021/acsami.8b09985. Epub 2018 Sep 11.

Authors

Lecai Wang¹, Li Li^{1

2}, Xiaoxiao Zhang¹, Feng Wu^{1

2}, Renjie Chen^{1

2}

Affiliations

¹ Beijing Key Laboratory of Environmental Science and Engineering , Beijing Institute of Technology , Beijing 100081 , China.
² Collaborative Innovation Center of Electric Vehicles in Beijing , Beijing 100081 , China.

PMID: 30152996
DOI: 10.1021/acsami.8b09985

Abstract

Compound-hierarchical-sphere-structured LiNi_0.5Co_0.2Mn_0.3O₂ was synthesized to improve the electrochemical performance of this material in lithium-ion battery cathodes. The product was found to have a large specific surface area, good electron and ion conductivities, a stable interface, and a robust nano/microhierarchical structure, all of which improved the rate capability, capacity, and cycling stability of this material. When this material was cycled between 3.0 and 4.3 V, a high discharge capacity of 180.8 mA h g^-1 was obtained at 0.2C with 94.0% capacity retention after 100 cycles. In addition, a superior discharge capacity of 148.9 mA h g^-1 was observed at a high current density of 1600 mA g^-1. This compound-hierarchical-sphere LiNi_0.5Co_0.2Mn_0.3O₂ is readily prepared using our ternary coprecipitation method. We also propose an effector unit theory to explain the enhanced cycling stability of this substance and believe that the present results will assist in the design of cathode materials for lithium-ion batteries.

Keywords: LiNi0.5Co0.2Mn0.3O2; cathode; compound-hierarchical-sphere; effector unit; lithium-ion battery.