Preparation method of high-specific capacity lithium ion battery anode material

Abstract

The invention discloses a preparation method of a high-specific capacity lithium ion battery anode material. The preparation method comprises the following specific steps: preparing micro-expansive graphite; adding silica powder and soluble stannous salt into water to obtain a turbid liquid, and adding soluble oxalate into the turbid liquid to obtain Si / SnC2O4 after solid-liquid separation of an obtained reaction liquid A; adding a manganese source and a zinc source into a solvent for reaction to obtain a reaction liquid B; adding the micro-expansive graphite and Si / SnC2O4 into the reaction liquid B, and carrying out ultrasonic dispersion, suction filtration and drying to obtain powder; and carrying out mixing cladding on the powder and a carbon source precursor to obtain the high-specific capacity lithium ion battery anode material. The preparation method is simple in processing steps, low in reaction condition requirement, easy to operate and low in cost; and the raw materials are economical and environment-friendly, and the materials are higher in specific capacity and cycling stability and easy for industrial production, so that the electric capacity of the prepared lithium ion battery anode material is high, the production efficiency can be greatly improved, and the material is suitable for volume production.

Description

technical field [0001] The invention relates to the technical field of materials for lithium ion batteries, in particular to a preparation method of a high specific capacity lithium ion battery negative electrode material. Background technique [0002] Since Japan's Sony Corporation took the lead in developing and commercializing lithium-ion batteries in 1990, lithium-ion batteries have developed rapidly. Nowadays, lithium-ion batteries have been widely used in many fields such as civilian and military. With the continuous advancement of science and technology, people have put forward more and higher requirements for the performance of batteries: the miniaturization and personalized development of electronic equipment requires batteries to have smaller volumes and higher specific energy output; aerospace energy requirements Batteries have cycle life, better low-temperature charge and discharge performance, and higher safety performance; electric vehicles require batteries w...

AI Technical Summary

Problems solved by technology

For example, magnetron sputtering or chemical deposition is used to deposit silicon thin films on current collectors, chemical vapor deposition is used to deposit nano-silicon thin films on graphite surfaces, nano-Si-Ni alloys are used, and silicon-carbon composite materials are produced by high-energy mechanical ball milling. Silicon powder with an average particle size of 80 nanometers is used to make silicon-carbon composite materials. These methods can indeed improve the cycle performance of silicon to a certain extent, but the degree of improvement is limited, and the cycle performance of the material still cannot meet the needs.