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High-efficiency sulfur/charcoal-coated lithium cobalt oxide positive electrode material and preparation method thereof

A positive electrode material, lithium cobalt oxide technology, applied in the field of high-efficiency sulfur/carbon-coated lithium cobalt oxide positive electrode material and its preparation, can solve the problems of restricting development prospects, lack of cobalt resources, toxicity, etc., and achieve extended storage time, Improved self-discharge, the effect of a simple method

Inactive Publication Date: 2016-03-16
王晓伟
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  • Claims
  • Application Information

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 manganate or ternary materials, etc., and its components are mainly lithium cobaltate plus conductive agent and then binder. Lithium oxide is lithium cobaltate, lithium manganese oxide 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, Expensive and toxic, so it is an important research direction for lithium-ion batteries to seek affordable, 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.

Method used

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Embodiment Construction

[0011] The high-efficiency sulfur / carbon-coated lithium cobaltate positive electrode material is prepared by the following components according to the ratio shown in parts by weight, sulfur / carbon composite material 50, lithium cobaltate 65, 45% lithium iron nitrate solution 20 , flake graphite 13, bonding material 13. The 45% lithium iron nitrate solution is a 60% lithium iron nitrate solution. The positive electrode material is lithium cobalt oxide. The conductive agent is flake graphite.

[0012] The preparation method of the high-efficiency sulfur / carbon-coated lithium cobaltate cathode material comprises the following steps:

[0013] (1) Put the carbon material and sublimated sulfur or sulfur powder into a zirconia or agate ball mill jar according to the above weight ratio, inject the ball mill jar into a high-purity inert gas in the glove box, and place it on a planetary ball mill for 5 hours. The ball milling speed is 500r / min, the mass ratio of elemental sulfur and ...

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Abstract

The invention relates to a high-efficiency sulfur / charcoal-coated lithium cobalt oxide positive electrode material and a preparation method thereof. The high-efficiency sulfur / charcoal-coated lithium cobalt oxide positive electrode material is prepared from the following components by weight: 50 parts of a sulfur / charcoal composite material, 65 parts of lithium cobalt oxide, 20 parts of a lithium ferric nitrate solution with a concentration of 45%, 13 parts of flake graphite and 13 parts of a bonding material. The high-efficiency sulfur / charcoal-coated lithium cobalt oxide 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 high-efficiency sulfur / carbon coated 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 manganate or ternary materials, etc., and its components are mainly lithium cobaltate plus conductive agent and then binder. Lithium oxide is lithium cobaltate, lithium manganese oxide 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, It is expensive and toxic, so it is 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...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/525H01M4/625H01M10/0525Y02E60/10
Inventor 王晓伟
Owner 王晓伟
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