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Cathode material for lithium battery used in electric automobile

A technology for electric vehicles and cathode materials, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as poor electronic conductivity and ion diffusion performance

Active Publication Date: 2016-09-21
CNGR ADVANCED MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main problem restricting its large-scale application is its poor electronic conductivity and Li-ion diffusion performance. Although LiFePO can be improved by coating, doping or morphology control 4 The electrochemical performance, and among them LiFePO 4 has also been partially industrialized, but LiFePO 4 The performance of cathode materials needs to be further improved, especially the improvement of charge and discharge performance at high rates, which is crucial for the development of power battery materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A positive electrode material for a lithium battery used in an electric vehicle. The raw materials include in parts by weight: 5 parts of carbon nanotubes, 2 parts of polycarbonate, 2 parts of polyethylene glycol, 1 part of citric acid, 3 parts of cellulose, disulfide 3 parts of sulfoxide, 5 parts of graphene, 2 parts of sodium carbonate, 3 parts of aromatic oil, 1 part of polyacrylamide, 2 parts of soybean lecithin, 1 part of ammonium persulfate, 10 parts of lithium iron sulfate, 2 parts of stearic acid, 1 part of sodium polymethacrylate, 2 parts of ethyl acetate.

[0022] Wherein, the cellulose is hydroxypropyl methylcellulose, the aromatic oil is toluene, and the dispersant is ammonium phenylalkonium chloride.

[0023] The preparation method of the positive electrode material for the lithium battery used by the electric vehicle comprises the following steps:

[0024] Step 1: Add carbon nanotubes, polycarbonate, polyethylene glycol, citric acid, and cellulose to wate...

Embodiment 2

[0029] A positive electrode material for a lithium battery used in an electric vehicle. The raw materials include in parts by weight: 8 parts of carbon nanotubes, 4 parts of polycarbonate, 3 parts of polyethylene glycol, 2 parts of citric acid, 6 parts of cellulose, disulfide 5 parts of sulfoxide, 8 parts of graphene, 3 parts of sodium carbonate, 4 parts of aromatic oil, 2 parts of polyacrylamide, 4 parts of soybean lecithin, 2 parts of ammonium persulfate, 15 parts of lithium iron sulfate, 3 parts of stearic acid, 5 parts of sodium polymethacrylate, 2 parts of ethyl acetate.

[0030] Wherein, the cellulose is hydroxyethyl cellulose, the aromatic oil is xylene, and the dispersant is dodecyl diaminoethyl glycine.

[0031] The preparation method of the positive electrode material for the lithium battery used by the electric vehicle comprises the following steps:

[0032] Step 1: Add carbon nanotubes, polycarbonate, polyethylene glycol, citric acid, and cellulose to water, ultra...

Embodiment 3

[0037] A positive electrode material for a lithium battery used in an electric vehicle. The raw materials include in parts by weight: 8 parts of carbon nanotubes, 5 parts of polycarbonate, 3 parts of polyethylene glycol, 2 parts of citric acid, 4 parts of cellulose, disulfide 6 parts of sulfoxide, 9 parts of graphene, 4 parts of sodium carbonate, 6 parts of aromatic oil, 3 parts of polyacrylamide, 5 parts of soybean lecithin, 3 parts of ammonium persulfate, 14 parts of lithium iron sulfate, 3 parts of stearic acid, 4 parts of sodium polymethacrylate, 3 parts of ethyl acetate.

[0038] Wherein, the cellulose is hydroxypropyl methylcellulose, the aromatic oil is toluene, and the dispersant is ammonium phenylalkonium chloride.

[0039] The preparation method of the positive electrode material for the lithium battery used by the electric vehicle comprises the following steps:

[0040] Step 1: Add carbon nanotubes, polycarbonate, polyethylene glycol, citric acid, and cellulose to ...

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PUM

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Abstract

The invention provides a cathode material for a lithium battery used in electric automobiles. The cathode material is prepared from the following raw materials: carbon nano tubes, polycarbonate, polyethylene glycol, citric acid, cellulose, thionyl chloride, graphene, sodium carbonate, aromatic oil, polyacrylamide, soya bean lecithin, ammonium persulfate, lithium ferric sulfate, stearic acid, sodium polymethacrylate and ethyl acetate. A preparation method thereof comprises the following steps: firstly preparing modified carbon nano tubes and modified graphene, then mixing the modified carbon nano tubes and the modified graphene with the lithium ferric sulfate, the stearic acid, the sodium polymethacrylate, the ethyl acetate and a dispersing agent, cleaning with deionized water after carbonizing the mixture, and drying to obtain the cathode material. The cathode material for the lithium battery used in the electric automobiles provided by the invention has higher first discharging efficiency and discharge capacity, and the capacitance loss ratio after manifold cycles is relatively low, so that the discharge capacity is improved, and the cathode material has a high promotional value.

Description

[0001] technical field [0002] The invention belongs to the technical field of positive electrode materials for lithium batteries, and in particular relates to a positive electrode material for lithium batteries used in electric vehicles. Background technique [0003] Lithium-ion batteries are the most practical and promising high-energy secondary batteries at present, because the specific capacity of carbon negative electrodes in commercial lithium-ion batteries is as high as 300mAh·g -1 , while the higher-priced cathode material has a lower specific capacity. In order to achieve capacity matching, more positive electrode materials need to be used, so that the positive electrode material accounts for more than 40% of the entire battery cost, and the safety of the battery also depends to a large extent on the positive electrode material, so research and development are low in price and excellent in performance. , Cathode materials with good safety are the current research ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/62
CPCH01M4/5825H01M4/62Y02E60/10
Inventor 刘平
Owner CNGR ADVANCED MATERIAL CO LTD