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Preparation method of liquid-cladding modified lithium ion battery negative pole piece

A technology of lithium-ion batteries and liquid modifiers, applied in battery electrodes, active material electrodes, batteries, etc., can solve the problems of high viscosity of modified liquid, large amount of electrolyte, and high cost, so as to improve conductivity and production cost The effect of low and high specific energy

Inactive Publication Date: 2015-07-08
田东
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although it has been reported that the modified liquid is used as an electrolyte, the viscosity of the modified liquid is too high and the price is high, and the amount of electrolyte used as a lithium-ion battery is large, resulting in too high a cost and cannot be commercialized.
However, the use of modified liquids for lithium-ion batteries coated with negative electrodes has not been reported.

Method used

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  • Preparation method of liquid-cladding modified lithium ion battery negative pole piece

Examples

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Effect test

Embodiment 1

[0016] A liquid-coated modified lithium-ion battery negative electrode sheet, including: 92 parts of natural graphite, 3 parts of acetylene black, 4 parts of polyvinylidene fluoride, liquid modifier 1-ethyl-3-methylimidazolium tetrafluoroboron 5 parts of acid salt and 100 parts of solvent N-methylpyrrolidone.

[0017] A liquid-coated modified lithium-ion battery negative electrode sheet, comprising the following steps: 92 parts of natural graphite, 3 parts of acetylene black, 4 parts of polyvinylidene fluoride, liquid modifier 1-ethyl-3-methylimidazole Mix 5 parts of tetrafluoroborate, grind and dry, then add 100 parts of solvent N-methylpyrrolidone and stir to make negative electrode slurry, apply the slurry on both sides of copper foil, and dry it at 110°C. Roll pressing to obtain the negative electrode sheet.

Embodiment 2

[0019] A liquid-coated modified lithium-ion battery negative electrode sheet, comprising: 93 parts of artificial graphite, 4 parts of acetylene black, 3 parts of polyvinylidene fluoride, and liquid modifier 1-butyl-3-methylimidazole trifluoroform 2 parts of sulfonate and 100 parts of solvent dimethylamide.

[0020] A liquid-coated modified lithium-ion battery negative electrode sheet, comprising the following steps: 93 parts of artificial graphite, 4 parts of acetylene black, 3 parts of polyvinylidene fluoride, liquid modifier 1-butyl-3-methylimidazole Mix 2 parts of fluoromethanesulfonate, grind and dry, then add 100 parts of solvent dimethylamide and stir to make negative electrode slurry, coat the slurry on both sides of copper foil, dry at 110°C, roll Press to obtain the negative electrode sheet.

Embodiment 3

[0022] A liquid-coated modified lithium-ion battery negative electrode sheet, comprising: 90 parts of lithium titanate, 5 parts of acetylene black, 5 parts of polyvinylidene fluoride, and 1.5 parts of liquid modifier N-butylpyridine tetrafluoroborate And 90 parts of solvent dimethylamide.

[0023] A liquid-coated modified lithium-ion battery negative electrode sheet, comprising the following steps: 90 parts of lithium titanate, 5 parts of acetylene black, 5 parts of polyvinylidene fluoride, and liquid modifier N-butylpyridine tetrafluoroborate 1.5 parts, mixed, ground and dried, then added 90 parts of solvent dimethylamide and stirred to make negative electrode slurry, coated the slurry on both sides of copper foil, dried at 110°C, and rolled to obtain negative electrode sheet .

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Abstract

The invention discloses a preparation method of a liquid-cladding modified lithium ion battery negative pole piece. The liquid-cladding modified lithium ion battery negative pole piece comprises a negative active material, a conducting agent, negative adhesive, a liquid modifying agent, a solvent and a negative current collector. Compared with prior art, a lithium ion battery made of the negative pole piece has advantages of high specific energy, high specific capacity and good safety, and the weaknesses of the existing lithium ion battery cathode material that the specific energy is low, the material structure is instable, the cycling property is poor, and the resistance to the corrosion of electrolyte is poor can be overcome. The preparation method is simple in process, low in production cost and suitable for industrialized mass production.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a preparation method of a liquid-coated modified lithium-ion battery negative plate. Background technique [0002] Lithium-ion batteries are favored because of their high voltage, high energy density, long cycle life, and low environmental pollution. However, with the rapid development of electronic information technology, higher requirements are placed on the performance of lithium-ion batteries. In recent years, great progress has been made in the improvement of the performance of cathode materials and the selection of electrolytes. Relatively speaking, the research on anode materials for lithium-ion batteries lags behind, which has become an important factor restricting the further improvement of the overall performance of lithium-ion batteries. Therefore, the research on anode materials is receiving more and more attention. [0003] Graphite materi...

Claims

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Application Information

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IPC IPC(8): H01M4/139H01M10/0525
CPCH01M4/131H01M4/133H01M4/1391H01M4/1393H01M4/62H01M10/0525H01M2004/027H01M2220/20Y02E60/10
Inventor 田东
Owner 田东
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