Modified graphene-coated lithium nickelate positive electrode material of battery and preparation method thereof

Abstract

The invention relates to a modified graphene-coated lithium nickelate positive electrode material of a battery and a preparation method thereof. The modified graphene-coated lithium nickelate positive electrode material is prepared from the following components by weight: 50 parts of graphene oxide, 40 parts of lithium nickelate, 30 parts of a lithium ferric nitrate solution with a concentration of 45%, 8 parts of flake graphite and 8 parts of a bonding material. The modified graphene-coated lithium nickelate positive electrode material overcomes the defect of failure caused by self-discharging of a protection plate of a lithium ion battery, so self-discharging of a whole battery pack is improved, the purpose of prolongation of the storage time of the lithium battery is achieved, and it is guaranteed that the lithium battery can be stored for a long time under the condition that a user does not charge an electric appliance after usage.

Description

technical field [0001] The invention relates to a modified graphene-coated lithium nickelate battery positive electrode material and a preparation method thereof. Background technique [0002] Since the commercialization of lithium-ion batteries, most of the cathode materials used in lithium-ion batteries are lithium nickelate, lithium nickelate or ternary materials, etc., and its components are mainly active materials plus conductive agents and binders. Lithium nickelate, lithium nickelate or ternary, etc.; most of the negative electrode materials use graphite as the active material, and then add some conductive agents and binders; its advantages are high capacity and long cycle life, but nickel resources are scarce and expensive. And it is toxic, so it has become an important research direction for lithium-ion batteries to seek cathode materials that are inexpensive, reliable, and environmentally friendly. Spinel-type cathode materials and ternary material layered oxides,...

AI Technical Summary

Problems solved by technology

[0002] Since the commercialization of lithium-ion batteries, most of the positive electrode materials used in lithium-ion batteries are lithium nickelate, lithium nickelate or ternary materials, etc., and its components are mainly active materials plus conductive agents and then binders. The active materials It is lithium nickelate, lithium nickelate or ternary, etc.; most of the negative electrode materials use graphite as the active material, and then add some conductive agent and binder; its advantages are high capacity and long cycle life, but nickel resources are scarce and expensive And it is toxic, so it is an important research direction for lithium-ion batteries to seek cheap, reliable, and environmentally friendly cathode materials.

Spinel-type positive electrode materials represented by lithium nickel oxide and layered oxides of ternary materials have been extensively studied in the past decade, but their development prospects are restricted by their respective defects.