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High-voltage lithium ion battery, composite electrode couple and preparation methods of high-voltage lithium ion battery and composite electrode couple

A lithium-ion battery and composite electrode technology, which is applied in the direction of non-aqueous electrolyte battery electrodes, battery electrodes, secondary batteries, etc., can solve problems such as short circuit of adjacent battery cells, avoid potential safety hazards, and improve dynamic consistency and safety Effect

Active Publication Date: 2012-04-18
BEIJING HAWAGA POWER STORAGE TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current collector of the internal series high-voltage lithium-ion battery is generally made of copper-aluminum composite foil film, and the thickness of the foil film is less than 100 microns. Once the current collector is crushed and cracks appear, a short circuit will occur between adjacent battery cells inside the high-voltage lithium-ion battery

Method used

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  • High-voltage lithium ion battery, composite electrode couple and preparation methods of high-voltage lithium ion battery and composite electrode couple
  • High-voltage lithium ion battery, composite electrode couple and preparation methods of high-voltage lithium ion battery and composite electrode couple

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Embodiment 1

[0018] Preparation of composite electrode pair: polyethylene oxide, LiFePO 4 / C and carbon black are composed of adhesive by weight percentage: carbon black: LiFePO 4 / C=8:7:85 is mixed in deionized water to obtain positive electrode slurry, and the slurry is evenly coated on the surface to be coated with a layer of inorganic nanoparticles (thickness is less than 5 microns, and the inorganic nanoparticles are SiO 2 、Al 2 o 3 、TiO 2 etc.), dry one side of the non-woven porous diaphragm at 80°C; then sodium carboxymethyl cellulose, carbon black, Li 4 Ti 5 o 12 (Lithium titanate) is composed of Li by weight percentage 4 Ti 5 o 12 : carbon black: binder=90: 3: 7 is mixed in deionized water to obtain the negative electrode slurry, and the slurry is evenly coated on the surface to be coated with a layer of inorganic nanoparticles (thickness is less than 5 microns, and the inorganic nanoparticles are SiO 2 、Al 2 o 3 、TiO 2 etc.), dry the other side of the non-woven porous...

Embodiment 2

[0022]Preparation of composite electrode pair: PVDF (polyvinylidene fluoride), modified lithium manganate and carbon black are composed of adhesive by weight percentage: carbon black: lithium manganate=8: 7: 85 mixed with NMP (N-methyl pyrrolidone), fully mixed to make positive electrode slurry. Apply the slurry evenly on one side of the polyolefin porous diaphragm, and dry at 60-110°C; PVDF, lithium titanate and carbon black are composed of lithium titanate: carbon black: adhesive = 90:3 :7 mixed in NMP, fully mixed to make negative electrode slurry, and then evenly coated the slurry on the other side of the polyolefin porous diaphragm, dried at 60 ~ 110 ° C, and then pressed in the range of 6 ~ 20MPa The sheet was cut to make a composite electrode pair.

[0023] Preparation of electronically conductive adhesive layer: PVDF and carbon black weight percentages are composed of carbon black: PVDF=7:3 dissolved in NMP to make a slurry, coated on both sides of the composite elect...

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Abstract

The invention discloses a high-voltage lithium ion battery, a composite electrode couple and preparation methods of the high-voltage lithium ion battery and the composite electrode couple, which belong to the technical field of lithium ion batteries. The composite electrode couple provided by the invention comprises a porous diaphragm, an anode mixture and a cathode mixture; one surface of the porous diaphragm is coated with the anode mixture which comprises an anode active material, a conductive agent and an adhesive; and the other surface of the porous diaphragm is coated with the cathode mixture which comprises a cathode active material, the conductive agent and the adhesive. The high-voltage lithium ion battery provided by the invention comprises the composite electrode couple, a composite current collector and an electrolyte, wherein a block body is formed by alternately superposing a plurality of composite electrode couples and composite current collectors; the composite electrode couples in the block body are soaked in the electrolyte; an electronic conductive adhesive layer with the thickness being less than 10 microns is arranged between each composite electrode couple and each composite current collector; and the composite current electrodes are arranged on the upper surface and the lower surface of the block body. The high-voltage lithium ion battery provided by the invention has the advantages of high voltage, good safety, good consistency and the like.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a high-voltage lithium ion battery for electric vehicles, a composite electrode pair and a preparation method thereof. Background technique [0002] As an important aspect of future new energy development, the large-scale development of electric vehicles is an inevitable trend. Lithium-ion batteries have attracted much attention as power batteries for electric vehicles, because lithium-ion batteries have the advantages of high specific energy, high operating voltage, long cycle life, low self-discharge, and no memory effect. However, at present, the safety and consistency of power batteries for electric vehicles have become a technical bottleneck in the scale development of the electric vehicle industry. [0003] Internal stacking of electrodes in series to prepare high-voltage lithium-ion batteries is a better solution to the above problems. However, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M2/16H01M10/0525H01M4/139
CPCY02E60/122Y02E60/10
Inventor 陈永翀李彦菊王秋平张萍韩立
Owner BEIJING HAWAGA POWER STORAGE TECH
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