Lithium/sodium ion battery negative electrode material and preparation method thereof

Abstract

The invention relates to a lithium / sodium ion battery negative electrode material and a preparation method thereof. The negative electrode material takes a biomass carbon material as a matrix, and thematrix is loaded with carbon-coated sulfide particles taking transition metal sulfide as an inner core. The preparation method comprises the following steps: (1) preparing the biomass carbon material: putting cleaned organic biomass into a vessel, pre-carbonizing the material in an aerobic atmosphere, carbonizing a pre-carbonized sample in an inert gas atmosphere, and performing activating in a CO2 atmosphere to obtain the biomass carbon material; (2) mixing transition metal sulfide with a carbon source material, and mixing an obtained mixture with the biomass carbon material to obtain a mixed solution; and (3) reacting, drying and calcining the mixed solution to obtain the biomass carbon-loaded carbon-coated transition metal sulfide negative electrode material. The preparation process issimple, and materials are easy to obtain; and when applied to a negative electrode material, the electrode material prepared by the method has the advantages of low cost, good conductivity, long cycle life, good charge-discharge capacity, good rate capability and the like.

Description

technical field [0001] The invention belongs to the technical field of battery materials, and in particular relates to a lithium / sodium ion battery negative electrode material and a preparation method thereof. Background technique [0002] Traditional fossil energy sources such as coal, oil and natural gas are decreasing day by day. Therefore, vigorously developing new clean and environmentally friendly energy sources can reduce dependence on traditional energy sources such as oil and coal mines, thereby reducing environmental pollution from burning fossil fuels. In order to achieve the goal of the coexistence of green water and green mountains and economic development, the development of new clean and environmentally friendly energy has become the commanding height that scientific researchers from all over the world are competing for. Electrochemical energy storage and electrochemical conversion systems with high comprehensive performance, such as lithium-ion batteries, sod...

AI Technical Summary

Problems solved by technology

However, lithium / sodium-ion batteries also have certain problems, especially the performance of negative electrode materials seriously restricts the performance of lithium / sodium-ion batteries.

For example, the reversible capacity and rate performance of lithium / sodium ion batteries are poor, the conductivity of lithium / sodium ion anode materials is poor, and the volume of buffer materials changes sharply during the lithium / sodium ion intercalation process, so its structure and electrochemical stability cannot be guaranteed.

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