A preparation method of graphite fluoride and lithium manganate composite material and preparation of lithium ion battery as positive electrode material

A technology of ink, lithium manganate and lithium ion batteries, which is applied in the field of lithium battery cathode materials, can solve the problems of battery capacity attenuation, slow dissolution, material lattice change, etc., and achieves improved electrical conductivity, improved cycle performance, high gram The effect of specific capacity

Active Publication Date: 2016-04-06
天津锦美碳材科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the theoretical capacity is not high; the material will slowly dissolve in the electrolyte, that is, the compatibility with the electrolyte is not very good; in the process of deep charge and discharge, the material is prone to crystal lattice change, resulting in a rapid decline in battery capacity

Method used

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  • A preparation method of graphite fluoride and lithium manganate composite material and preparation of lithium ion battery as positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Concentration of 10% hydrofluoric acid and fluorinated graphite with 20% fluorine content are mixed according to the ratio of 1:10, ultrasonic cleaning for 1 hour, suction filtration, and drying in an oven at 200°C for 2 hours. The mass ratio of graphite fluoride to lithium manganate is 1:8 and mixed in a fusion spheroidizer. The temperature of the fusion spheroidizer is 150° C., the rotation speed is 900 Hz, and the mixture is fused for 2 hours. The fused composite material is iron-removed and sieved to obtain graphite fluoride composite lithium manganate cathode material.

[0019] Add conductive carbon black and PVDF to the composite material, and coat it on aluminum foil to make a positive electrode sheet, and make a lithium battery with graphite negative electrode and electrolyte. Under the environmental condition of 20±5℃, the constant current charge and discharge test was carried out on the battery in the range of 3.0~4.2V. The specific results are shown in the ta...

Embodiment 2

[0021] Concentration of 10% hydrofluoric acid and 30% fluorine graphite fluoride, mixed according to the ratio of 1:10, ultrasonic cleaning for 1 hour, after suction filtration, placed in an oven at 200 ° C for 2 hours. Graphite fluoride and lithium manganate with a mass ratio of 1:8 were added to a fusion spheroidizer for mixing. The temperature of the fusion spheroidizer was 150° C. and the rotation speed was 800 Hz, and the mixture was fused for 2 hours. The fused composite material is iron-removed and sieved to obtain graphite fluoride composite lithium manganate cathode material.

[0022] Add conductive carbon black and PVDF to the composite material, and coat it on aluminum foil to make a positive electrode sheet, and make a lithium battery with graphite negative electrode and electrolyte. Under the environmental condition of 20±5℃, the constant current charge and discharge test was carried out on the battery in the range of 3.0~4.2V. The specific results are shown in th...

Embodiment 3

[0024] Concentration of 10% hydrofluoric acid and 30% fluorine graphite fluoride, mixed according to the ratio of 1:10, ultrasonic cleaning for 1 hour, after suction filtration, placed in an oven at 200 ° C for 2 hours. The mass ratio of graphite fluoride to lithium manganate is 1:15 and mixed in a fusion spheroidizer. The temperature of the fusion spheroidizer is 150° C., the rotation speed is 800 Hz, and the mixture is fused for 2 hours. The fused composite material is iron-removed and sieved to obtain graphite fluoride composite lithium manganate cathode material.

[0025] Add conductive carbon black and PVDF to the composite material, and coat it on aluminum foil to make a positive electrode sheet, and make a lithium battery with graphite negative electrode and electrolyte. Under the environmental condition of 20±5℃, the constant current charge and discharge test was carried out on the battery in the range of 3.0~4.2V. The specific results are shown in the table below.

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Abstract

The invention relates to a preparation method for a graphite fluoride-lithium manganate composite material and application of the same to prepare a lithium ion battery as a cathode material. The technical scheme is characterized in: (1) adding a certain amount of hydrofluoric acid and distilled water into purchased conventional graphite fluoride, performing ultrasonic cleaning and drying to removing impurities on the surface of graphite fluoride; (2) mixing cleaned graphite fluoride with lithium manganate according to a certain ratio, putting in a fusion spheroidizing machine to fully fuse; (3) performing iron removing and screening on the fused graphite fluoride-lithium manganate composite material to obtain the graphite fluoride combined lithium manganate cathode material; and (4) adding a conductive agent and a binder into the composite material, coating aluminium foil with the mixture to prepare a cathode piece and further to prepare the lithium battery by employing the cathode piece, graphite anode and electrolyte. The preparation technology is simple in operation, and helps to overcome the disadvantages of graphite fluoride and LiMn2O4 material, combine the advantages of the two and substantially improve the capacity and the rate capability of LiMn2O4 material, and the composite material is applicable to preparation of the lithium ion power battery.

Description

technical field [0001] The invention relates to an electrode material used in a lithium battery, in particular to a preparation method of a composite positive electrode material of graphite fluoride and lithium manganate, and belongs to the technical field of lithium battery positive electrode materials. Background technique [0002] Graphite fluoride is a graphite interlayer compound prepared by the direct reaction of carbon and fluorine. It has excellent thermal stability and is an electrical and thermal insulator. It is not corroded by strong acids and alkalis, and its lubricating properties exceed those of MoS. 2 and flake graphite. [0003] Graphite fluoride has the following excellent characteristics as a cathode material for lithium batteries: (1) High voltage and high energy density. The actual nominal voltage of a general manganese battery is 3V, and the energy density is 360Wh / kg. The open circuit voltage of the button-type graphite fluoride lithium battery is ab...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/587H01M10/0525
CPCH01M4/505H01M4/5835H01M4/625H01M10/0525Y02E60/10
Inventor 臧文平赵旭张勇
Owner 天津锦美碳材科技发展有限公司
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