Sulfur/carbon coated lithium manganate cathode material and preparation method thereof

Abstract

The invention relates to a sulfur / carbon coated lithium manganate cathode material and a preparation method thereof. The sulfur / carbon coated lithium manganate cathode material is prepared from the following components in parts by weight: 15-25 parts of sulfur / carbon composite material, 80-85 parts of active material, 5-10 parts of functional material, 4-8 parts of conductive material and 4-8 parts of binding material, wherein the functional material is 60% lithium iron nitrate solution; the cathode material is lithium manganate; the conductive agent is flake graphite. The defect of failure of lithium ion batteries caused by self-discharge of protection boards is overcome by adopting the sulfur / carbon coated lithium manganate cathode material, thus improving self-discharge of the whole battery pack, achieving the aim of prolonging the lithium battery storage time and ensuring that the lithium batteries can be stored for a longer time under the condition that users do not charge the electric appliances after using the electric appliances.

Description

technical field [0001] The invention relates to a lithium manganate cathode material coated with sulfur / carbon and a preparation method thereof. Background technique [0002] Since the commercialization of lithium-ion batteries, most of the positive electrode materials used in lithium-ion batteries are lithium manganate, lithium manganate or ternary materials, etc., and its components are mainly active materials plus conductive agents and binders. The active materials It is lithium manganate, lithium manganate 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 manganese resources are scarce and expensive And it is toxic, so it has become an important research direction for lithium-ion batteries to seek cheap, reliable, and environmentally friendly cathode materials. Spinel-type cathode materials represented by lithium manganat...

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 manganate, lithium manganate or ternary materials, etc., and its components are mainly active materials plus conductive agents and binders. The active materials It is lithium manganate, lithium manganate 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 manganese 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 manganate and layered oxides of ternary materials have been widely studied in the past decade, but their development prospects are restricted by their respective defects.