Tin-based composite spherical hard charcoal microsphere negative electrode material of lithium battery, and preparation method for negative electrode material

Abstract

The invention relates to a tin-based composite spherical hard charcoal microsphere negative electrode material of a lithium battery, and a preparation method for the negative electrode material, and belongs to the technical field of negative electrode materials of lithium batteries. The tin-based composite spherical hard charcoal microsphere negative electrode material of the lithium battery is prepared from tin-containing precursors and spherical hard charcoal spheres according the mass ratio of 1:2 to 1:50, wherein the spherical hard charcoal spheres are prepared from starch-based hard charcoal. SnO2 is filled into holes in the spherical hard charcoal microsphere negative electrode material, so that on one hand, stress generated by SnO2 deformation can be absorbed by the charcoal layers at the periphery of the holes and the circulating stability of the SnO2 is guaranteed, and on the other hand, the gap in the spherical hard charcoal can be utilized, the space utilization rate and the volume energy density of the material are increased and the effect of killing two birds with one stone is achieved.

Description

technical field [0001] The invention relates to a lithium ion battery negative electrode material and a preparation method thereof, more specifically, the invention relates to a lithium battery tin-based composite spherical hard carbon microsphere negative electrode material and a preparation method thereof, belonging to the technical field of lithium ion battery negative electrode materials . Background technique [0002] With the increasing popularity of portable digital products, as well as the rise of electric vehicles and large-scale energy storage systems, lithium-ion secondary batteries have shown great promise due to their advantages such as high energy density, high working voltage, long cycle life, no pollution, and good safety performance. It has a wide range of application prospects and has attracted more and more attention from researchers and enterprises. [0003] The research on lithium battery anode materials has always been one of the key technologies of li...

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Problems solved by technology

[0008] The invention aims to solve the problem that the volume of the tin dioxide negative electrode material in the prior art changes greatly during charging and discharging, which leads to the structural damage of the electrode during the cycle, the sharp attenuation of capacity and the holes in the spherical hard carbon microsphere negative electrode material, which reduces the battery life. To solve the problem of volumetric energy density, provide a tin-based composite spherical hard carbon negative electrode material for lithium batteries, which can fill the holes in the spherical hard carbon microspheres, improve the volumetric energy density of the battery, and avoid the tin dioxide negative electrode material during charging and discharging. The volume changes greatly, resulting in the structural damage of the electrode during the cycle, and the problem of a sharp decline in capacity