Lithium-rich manganese-based anode material for lithium ion battery and preparation method

Abstract

The invention discloses a lithium-rich manganese-based anode material for a lithium ion battery, and a preparation method. The preparation process comprises the following steps: (1) metal lithium salt, nickel salt, manganese salt and cobalt salt are dissolved in deionized water and mixed to form a transparent solution, sucrose is added into the transparent solution, the solution is agitated to be transparent and then is heated, agitation is performed continuously for evaporation, water in the solution is removed, so that sol is formed firstly, and gel is obtained finally; (2) the gel is subjected to primary calcination at 500 DEG C-550 DEG C for 2h-4h to remove organic ingredients, and then the gel subjected to primary calcination is subjected to secondary calcination at 800 DEG C-900 DEG C for 15h-20h after being ground, the preparation process is greatly simplified, the temperature, the pH value, the feeding speed and the like of a co-precipitation system are not required to be controlled precisely, the contact between primary particles is improved efficiently, and the rate capability of the material is improved.

Description

technical field [0001] The invention relates to the field of positive electrode materials for lithium ion batteries, in particular to the positive electrode materials and preparation methods of lithium-rich manganese-based lithium ion batteries. Background technique [0002] Lithium-ion batteries have been widely used in mobile phones, cameras, notebook computers, portable appliances, etc. Compared with traditional secondary batteries, lithium-ion batteries have the advantages of high platform voltage (about 3.2-3.7V), high energy density, and no memory effect. The early commercial production of lithium-ion batteries mainly uses LiCoO2 as the positive electrode material. LiCoO2 has high capacity and good stability, but this positive electrode material has performance, economic and environmental problems, and people need to develop new ones. The cathode material system is used to meet people's needs for energy density, power density, safety, and low cost of energy storage ba...

AI Technical Summary

Problems solved by technology

However, this type of lithium-rich manganese-based lithium-ion battery cathode material itself has poor conductivity, so that the performance under high-current charging and discharging is still not ideal, and it cannot meet the requirements of practical applications.

In particular, due to the existence of the Li2MnO3 phase with low conductivity and the decrease in the lattice order generated during the first activation process, the transport of lithium ions is affected, so the rate performance of this type of lithium-rich manganese-based lithium-ion battery cathode material has become One of the bottlenecks of its practical application