Electrochemical Study of K+-Doped LiNi0.5Co0.2Mn0.3O2 Prepared by Co-Precipitation Freeze-Drying Method

LiNi 0.5 Co 0.2 Mn 0.3 O 2 lithium-ion battery cathode material is considered to be one of the most promising cathode materials for development. The co-precipitation-freeze-drying method was used to add K + to the materials to investigate the changes in the microstructure as well as the electrochemical properties of the materials. Specifically, K + -doped LiNi 0.5 Co 0.2 Mn 0.3 O 2 cathode materials were successfully synthesized by the co-precipitation-freeze-drying method, and the prepared Li K x Ni 0.5 Co 0.2 Mn 0.3 O 2 materials were well-distributed and exhibited excellent electrochemical properties. Providing an initial discharge capacity of 189.26 mA h g –1 capacity retention of 66.66%, 100 cycles of 2.5–4.8 V and a current density of 0.1 C. The good electrochemical performance of the material may be attributed to the increased lattice spacing of the material with the addition of K + , which enlarges the channels for lithium ion insertion and detachment, further accelerating its diffusion rate.