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Ionic-liquid-coated lithium ion battery positive plate as well as preparation method thereof and lithium ion battery

A lithium-ion battery and ionic liquid technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, secondary batteries, etc., can solve the problems of high viscosity of ionic liquid, large amount of electrolyte solution, high cost, etc., to improve specific capacity, production The effect of low cost and high specific energy

Inactive Publication Date: 2015-03-25
WUHU HUAXINNUO ELECTROCHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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

Method used

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  • Ionic-liquid-coated lithium ion battery positive plate as well as preparation method thereof and lithium ion battery
  • Ionic-liquid-coated lithium ion battery positive plate as well as preparation method thereof and lithium ion battery

Examples

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Effect test

Embodiment 1

[0030] An ionic liquid-coated lithium-ion battery positive electrode sheet, including: 85 parts of lithium iron phosphate, 6 parts of acetylene black, 8 parts of polyvinylidene fluoride, ionic liquid 1-ethyl-3-methylimidazolium tetrafluoroborate 1 part and 100 parts of solvent N-methylpyrrolidone.

[0031] A preparation method of a lithium-ion battery positive plate coated with an ionic liquid, comprising the following steps:

[0032] Mix and grind 85 parts of lithium iron phosphate, 6 parts of acetylene black, 8 parts of polyvinylidene fluoride, and 1 part of ionic liquid 1-ethyl-3-methylimidazolium tetrafluoroborate, and then add solvent N- Stir 100 parts of methylpyrrolidone to make a positive electrode slurry, apply the slurry to both sides of an aluminum foil, dry it at 110°C, and roll it to obtain a positive electrode sheet.

[0033] A kind of lithium ion battery, its preparation process is:

[0034] 92.5 parts of graphite, 3.5 parts of sodium carboxymethyl cellulose, ...

Embodiment 2

[0036] An ionic liquid-coated lithium-ion battery positive electrode sheet, comprising: 83.8 parts of lithium cobaltate, 7 parts of acetylene black, 8 parts of polytetrafluoroethylene, ionic liquid 1-butyl-3-methylimidazole trifluoromethanesulfonic acid 1.2 parts of salt and 100 parts of solvent dimethylamide.

[0037] A preparation method of a lithium-ion battery positive plate coated with an ionic liquid, comprising the following steps:

[0038] 83.8 parts of lithium cobaltate, 7 parts of acetylene black, 8 parts of polytetrafluoroethylene, and 1.2 parts of ionic liquid 1-butyl-3-methylimidazolium trifluoromethanesulfonate are mixed and ground, dried, and then the solvent dimethyl 100 parts of the amide were stirred to make a positive electrode slurry, and the slurry was coated on both sides of an aluminum foil, dried at 110° C., and rolled to obtain a positive electrode sheet.

[0039] A kind of lithium ion battery, its preparation process is:

[0040] 87 parts of graphit...

Embodiment 3

[0042]An ionic liquid-coated lithium ion battery positive electrode sheet, comprising: 82.5 parts of lithium manganate, 7 parts of acetylene black, 9 parts of polyvinylidene fluoride, 1.5 parts of ionic liquid N-butylpyridine tetrafluoroborate and solvent two 90 parts of methylamide.

[0043] A preparation method of a lithium-ion battery positive plate coated with an ionic liquid, comprising the following steps:

[0044] Mix 82.5 parts of lithium manganate, 7 parts of acetylene black, 9 parts of polyvinylidene fluoride, and 1.5 parts of ionic liquid N-butylpyridine tetrafluoroborate, mix and grind, dry, and then add 90% of solvent dimethylamide to carry out Stir to make a positive electrode slurry, apply the slurry to both sides of the aluminum foil, dry at 110°C, and roll to obtain a positive electrode sheet.

[0045] A kind of lithium ion battery, its preparation process is:

[0046] 88 parts of graphite, 6.5 parts of sodium carboxymethyl cellulose, 5.5 parts of negative e...

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Abstract

The invention discloses an ionic-liquid-coated lithium ion battery positive plate as well as a preparation method thereof and a lithium ion battery. The ionic-liquid-coated lithium ion battery positive plate comprises a positive active material, a conductive agent, a positive binder, an ionic liquid, a solvent and a positive current collector. Compared with the prior art, the prepared lithium ion battery positive electrode has the advantages of high specific energy and specific capacity, and good safety, so that the defects of low specific energy, an unstable material structure, poor cycle performance and low oxide positive electrode material safety of the existing lithium ion battery positive plate material are overcome, and therefore, a positive electrode material with high safety, high specific energy and low cost is provided for the lithium ion battery. The preparation method of the ionic-liquid-coated lithium ion battery positive plate is simple in process, low in production cost and suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of chemical batteries, and in particular relates to a lithium-ion battery positive plate coated with an ionic liquid, a preparation method thereof, and a lithium-ion battery. 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 carbon anodes and the selection of electrolytes. Relatively speaking, the research on cathode 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 cathode materials is receiving more and more a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/139H01M4/62
CPCH01M4/366H01M4/60H01M4/62H01M10/0525Y02E60/10
Inventor 袁希梅褚道葆
Owner WUHU HUAXINNUO ELECTROCHEM TECH
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