Modified sulfur/carbon doped lithium cobalt oxide cathode material and preparation method thereof

Abstract

The invention relates to a modified sulfur / carbon doped lithium cobalt oxide cathode material and a preparation method thereof. The modified sulfur / carbon doped lithium cobalt oxide cathode material is prepared from the following components in parts by weight: 25 parts of sulfur / carbon composite material, 70 parts of active material, 3 parts of functional material, 10 parts of conductive material and 10 parts of binding material, wherein the functional material is 60% lithium iron nitrate solution; the cathode material is lithium cobalt oxide; 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 modified sulfur / carbon doped lithium cobalt oxide 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 modified sulfur / carbon doped lithium cobalt oxide cathode material 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 cobaltate, lithium cobaltate or ternary materials, etc., and its components are mainly active materials plus conductive agents and then binders. The active materials Lithium cobaltate, lithium cobaltate 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 cobalt 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 cobalt...

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