From Silica Leachate of Laterite Nickel Ore to Silicate Cathode Material: Preparation of Li2MnSiO4/C as Lithium- ion Battery Cathode Material by Two -Stage Roasting Method

To solve the world's environmental protection problems, new energy production methods and batteries with excellent energy storage efficiency are effective measures. Lithium-ion batteries (LIBs) occupy an important position in energy storage batteries, and their positive electrode materials are the focus of LIBs research and development. In this paper, by controlling different reaction conditions, spherical silica powders with smaller particle size (200 nm), better sphericity and superior performance were prepared from sodium silicate filtrate produced during the alkaline hydrothermal reaction of laterite nickel ore. Then, the optimum synthesis conditions of Li 2 MnSiO 4 /C cathode material were investigated by using the prepared silica powder as raw material by two-stage roasting method. The diffraction peak of the obtained sample is sharp, the degree of crystallization is good, and the diffraction peak of other substances is not found in the spectrum, indicating that the prepared Li 2 MnSiO 4 /C cathode material has high purity, and the stable capacity at 1 C current density is maintained at 110mAh/g, which is greatly improved compared with the ordinary Li 2 MnSiO 4 (60 mAh/g). The cyclic charge-discharge curves of the material are similar, which also indicates that the material has good structural stability. The synthesis of Li 2 MnSiO 4 /C cathode material using laterite nickel ore filtrate as raw material is conducive to further compression of the preparation cost of lithium battery materials, and is also conducive to the full utilization of mineral resources. It is a new idea to combine upstream minerals with midstream materials, and provides a good structural support for energy structure and energy security.