Pre-blended conductive agent to effectively improve the storage properties of LiNi0.6Co0.2Mn0.2O2 cathode materials

Abstract Nowadays, the high-nickel ternary cathode materials attract more and more attention because of their high capacity. However, compared with other cathode materials, the disadvantage of high-nickel ternary cathode materials in storage performance is very obvious. The obvious impurities on the surface of high-nickel ternary materials are generated after storage for a period of time, and its electrochemical performance produce a cliff-like decline. In this work, we use the pre-blending of conductive agent to simply and effectively improve the storage performance of LiNi0.6Co0.2Mn0.2O2 cathode materials under high temperature and high humidity conditions. Fine particles of conductive agent can be well filled in the gap between the primary particles of the material, suppressing the sites where impurities are most easily formed during storage. Compared with the pristine materials, when stored for the same time, the impurities generated on the surface of modified materials are significantly fewer, the increase of weight is smaller, and more excellent electrochemical performance is exhibited. It can be seen from the results that the pre-blending of the conductive agent can greatly improve the storage performance of the high-nickel ternary cathode materials.