Preparation method of lithium battery tin-base cathode material

Abstract

The invention discloses a preparation method of a lithium battery tin-base cathode material. The preparation method comprises the following steps: (1) mixing 0.8g of stannous oxalate, 0.23g of titanium sulfate and 0.11g of graphene oxide, adding the mixture into 40ml of deionized water, and stirring until the mixture is completely dissolved, so as to obtain a mixed solution; (2) adding 0.448g of ammonium fluoride into the mixed solution, stirring for half an hour, introducing the mixed solution into a polytetrafluoroethylene reaction kettle, and carrying out hydrothermal reaction at 120-180 DEG C for 6-72 hours; (3) after the hydrothermal reaction, removing supernatant liquid from the mixed solution, filtering by virtue of deionized water and ethanol, and washing, so as to remove impurity ions; (4) after the impurity ions are removed, carrying out vacuum drying on a sample obtained in the step (3) at 100-120 DEG C for 4-18 hours, so as to obtain dried powder; and (5) carrying out vacuum heat treatment on the dried powder at 180-250 DEG C for 0-8 hours, so as to obtain the lithium battery tin-base cathode material. The preparation method has the beneficial effects that a preparation process is simple, the preparation cost is low, the cathode material is stable in cycle performance and high in electron transfer rate, and the volume of a battery can still reach 455.3mAh / g after 200 circles.

Description

technical field [0001] The invention relates to a preparation method of a tin-based negative electrode material of a lithium battery, and belongs to the technical field of lithium ion battery materials. Background technique [0002] Lithium-ion batteries are high-capacity, high-power batteries. In order to meet the growing application demands, lithium-ion batteries should simultaneously possess electrochemical properties such as good cycle stability, high reversible capacity, and rapid charge-discharge. These electrochemical properties require that during the cycling process, the migration route of lithium ions in the structure of the negative electrode material should be as short as possible, the volume change caused by the repeated insertion and extraction of lithium ions in its structure should be as small as possible, and the storage capacity of the negative electrode material itself should be as small as possible. The lithium capacity should be as high as possible. Ho...

AI Technical Summary

Problems solved by technology

Although these studies have improved the electrical conductivity of the battery and suppressed the volume expansion during cycling, these batteries are expensive to prepare and relatively weak in cycle stability. As the number of cycles increases, the capacity of the battery continues to decrease.