Synthetic method for anode material of lithium ion cell

Abstract

The process of synthesizing positive electrode material for lithium ion cell includes the following steps: adding lithium hydroxide solution and ammonia water solution homogeneously into soluble salt solution to generate hydroxide precipitate and lithium salt solution, with the added lithium hydroxide solution amount being so that the ratio between other metal ion and lithium ion in the solution is 1 to 0.9-1.2 and the added ammonia water being so as to ensure the metal ion in the salt existing in hydroxide form; eliminating water from the reaction product; and backing at constant temperature within 700-950 deg.c for certain time to synthesize the positive electrode material for lithium ion cell of molecular expression of Li1+xMO2, with x having the range of -0.1 to +0.2. The present invention uses lithium hydroxide, rather than sodium hydroxide, and there is no need of water washing to eliminate lithium ion attached to the precipitate, resulting in saving in water and lowered cost.

Description

technical field [0001] The present invention relates to a method for synthesizing a positive electrode material for a lithium ion battery. Background technique [0002] As a green high-energy power source, lithium ion has been widely valued for more than ten years. It has the characteristics of high energy, good cyclability and low self-discharge. In order to give full play to the performance characteristics of lithium-ion batteries, researchers around the world conduct active research on lithium-ion batteries. Generally speaking, the synthesis of cathode materials requires adding sodium hydroxide solution to the soluble salt solution to react to form a precipitate. The precipitate is often accompanied by harmful metal sodium ions. In order to remove these metal ions, it takes more than three times. Washing with water to remove useless metal ions, these washings are generally discharged into the environment, causing pollution to the environment. It wastes water resources a...

AI Technical Summary

Problems solved by technology

Generally speaking, the synthesis of positive electrode materials needs to add sodium hydroxide solution to the soluble salt solution to react to form precipitates, which often have harmful metal sodium ions attached to them. In order to remove these metal ions, it will take more than three times. Washing with water to remove useless metal ions, these lotions are generally discharged into the environment, causing pollution to the environment

It wastes water resources and pollutes the environment