Anode material of lithium cell and solid-phase sintering production method at high temperature

Abstract

The invention relates to the anode material of a lithium battery. The general formula is LiMNO4, wherein, the M is Mg or Ca; the N is Ta, Nb or V. A method of high-temperature solid state sintering of the invention comprises the following steps: Li2O, MO and N2O5 are taken as raw materials; the M is Mg or Ca; the N is Ta, Nb or V; Li2O, MO and N2O5 of which the purity is 99.99 percent are fully mixed by a molar ratio of 1:2:1 and then ball milled in a ball mill; particle diameter of the powder is 1-2 micrometers; the powder is parched for 4 plus or minus 2 hours under a temperature of 200 DEG C and is planished tablet to be sintered in a high-temperature sintering furnace. The temperature of the furnace is raised to 1000 plus or minus 50 DEG C from the room temperature and is preserved for 8-20 hours; furnace cooling is carried out and the powder tablet is taken out to be crashed until the particle diameter is 0.8-1.6 micrometers; after evenly grinded and planished tablet, the powder is put into the high-temperature sintering furnace for the third time and the temperature is raised to 1400 plus or minus 50 DEG C from the room temperature; the furnace cooling is carried out after heat preservation for 25-36 hours; then the powder tablet is taken out to be crashed until the particle diameter is 0.5-1.2 micrometers.

Description

technical field [0001] The invention relates to positive electrode materials for lithium batteries. Especially LiMgTaO 4 、LiMgVO 4 , LiMgNbO 4 、LiCaTaO 4 、LiCaVO 4 and LiCaNbO 4 Oxide cathode material. Background technique [0002] Since the commercial production of lithium-ion batteries by Sony Corporation of Japan in 1990, lithium-ion batteries have attracted more and more attention from the battery industry at home and abroad due to a series of advantages such as high energy density, long cycle life, high open circuit voltage, safety and pollution-free. , and its R&D and production are also popular in the battery industry. At present, lithium-ion batteries are divided into two categories: liquid lithium-ion batteries and polymer lithium-ion batteries. [0003] In order to achieve large-scale commercialization of polymer lithium-ion batteries, the following main problems still need to be solved: a. It is necessary to develop positive electrode materials with high d...

AI Technical Summary

Problems solved by technology

[0003] In order to achieve large-scale commercialization of polymer lithium-ion batteries, the following main problems still need to be solved: a. It is necessary to develop a battery with high discharge voltage, large capacity, and high charge-discharge cycle Positive electrode material with long life, which needs to have good electrical compatibility with the electrolyte to reduce contact resistance; b. It is necessary to develop negative electrode materials without dendrites and long charge and discharge cycle life; c. It is necessary to develop Polymer electrolyte with high conductivity. The polyether solid electrolyte that has been studied more at present has low conductivity after doping, and the internal resistance of the battery is large and the discharge current is small.

LiMgTaO4, LiMgVO4, LiMgNbO4, LiCaTaO4, LiCaVO4 have not yet been seen Disclosure of and LiCaNbO4 composite oxides as cathode materials for lithium-ion batteries