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Preparation process of lithium ion low-temperature battery

A low-temperature battery and preparation process technology, which is used in the manufacture of electrolyte batteries, secondary batteries, battery electrodes, etc., can solve the problems of short discharge time, inability to discharge, and affect the normal use of batteries, and achieve stable performance and high volume specific energy. Effect

Inactive Publication Date: 2018-11-16
河南新太行电源股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the existing lithium-ion batteries are used in an environment of -20°C or -40°C, the discharge time is often short or cannot be discharged, which seriously affects the normal use of the battery.

Method used

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  • Preparation process of lithium ion low-temperature battery
  • Preparation process of lithium ion low-temperature battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A preparation process for a lithium-ion low-temperature battery, which includes a positive pole and a negative pole piece, the pole pieces are provided with tabs, and a separator is provided between the positive and negative pole pieces. (1) The thickness of the positive pole piece is 103 μm, and the positive pole piece includes It is composed of lithium cobaltate active material, binder PVDF, conductive agent SP and carbon nanotubes; the weight percentage of positive electrode active material: binder: conductive agent is 94%: 2%: 4%; (2) The thickness of the negative electrode sheet is 105 μm, and the negative electrode sheet includes graphite, a thickener CMC, a binder SBR, a conductive agent SP and carbon nanotubes in the negative electrode sheet. Among them, the negative electrode active material: thickener: binder: conductive agent The weight percentage is 95%: 1.5%: 2%: 1.5%; (3) The positive and negative electrodes are wound to form a core, and then assembled to m...

Embodiment 2

[0022] A preparation process for a lithium-ion low-temperature battery, which includes a positive electrode and a negative electrode sheet, with tabs on the electrode sheet, and a separator between the positive and negative electrode sheets. (1) The thickness of the positive electrode sheet is 105 μm, and the positive electrode sheet includes It is composed of lithium cobaltate active material, binder PVDF, conductive agent SP and carbon nanotubes; the weight percentage of positive electrode active material: binder: conductive agent is 97%: 1%: 2%; (2) The thickness of the negative electrode sheet is 104 μm, and the negative electrode sheet includes graphite, a thickener CMC or HPMC, a binder SBR, a conductive agent SP and carbon nanotubes in the negative electrode sheet. Among them, the negative electrode active material: thickener: binder: conductive The weight percentage of the agent is 93%: 2.5%: 2%: 2.5%; (3) the positive and negative electrodes are wound to form a core, a...

Embodiment 3

[0027] A preparation process for a lithium-ion low-temperature battery, which includes a positive electrode and a negative electrode sheet, with tabs on the electrode sheet, and a separator between the positive and negative electrode sheets. (1) The thickness of the positive electrode sheet is 109 μm, and the positive electrode sheet includes It is composed of lithium cobaltate active material, binder PVDF, conductive agent SP and carbon nanotubes; the weight percentage of positive electrode active material: binder: conductive agent is 96%: 1%: 3%; (2) The thickness of the negative electrode sheet is 110 μm, and the negative electrode sheet includes graphite as the negative electrode active material, thickener CMC or HPMC, binder SBR, conductive agent SP and carbon nanotubes, among which, the negative electrode active material: thickener: binder: conductive The weight percentage of the agent is 94%: 1.5%: 2.5%: 2%; (3) the positive and negative electrodes are wound to form a co...

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Abstract

The invention discloses a preparation process of a lithium ion low-temperature battery. (1) A positive plate comprises a lithium cobalt oxide active substance, a binder PVDF, a conductive agent SP anda carbon nano tube; (2) a negative electrode slice comprises negative active material graphite, a thickening agent CMC or HPMC, an adhesive SBR, a conductive agent SP and a carbon nano tube, (3) a positive electrode and a negative electrode are wound to form a roll core, then a battery is manufactured through assembling, (4) an added electrolyte is a low-temperature electrolyte, wherein the fluxadopted by the electrolyte is PC (propylene carbonate) ), EC (ethylene carbonate), DMC (dimethyl carbonate) and MA (methyl acetate) ), wherein the electrolyte adopts LiPF<6>, wherein the concentrationof the electrolyte is 1.0-1.2M / L. The preparation process has the following advantages that the material variety and proportion of the battery are changed, so that the performance of the battery is stable, the volume ratio is high, and the work is stable under a low-temperature condition.

Description

technical field [0001] The invention relates to the preparation of lithium-ion batteries, in particular to a preparation process suitable for lithium-ion low-temperature batteries. Background technique [0002] In order to achieve the purpose of energy saving and environmental protection, the development of new high-efficiency energy has become an inevitable trend in the development of today's society. At present, among the batteries on the market, lithium-ion batteries are widely used in the fields of electronic products and electric vehicles due to their high specific energy, long cycle life, and environmental protection. [0003] Existing lithium-ion batteries are mainly composed of positive and negative pole pieces, separators, and electrolytes, and are assembled through processes such as sheet making, winding, and liquid injection. The battery produced by this method has the characteristics of high energy density, high output voltage, small self-discharge, excellent cy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M4/139H01M10/0568H01M10/0569
CPCH01M4/139H01M10/0568H01M10/0569H01M10/058H01M2300/0037Y02E60/10Y02P70/50
Inventor 卞鸿彦穆培振徐云军王义新刘静杰
Owner 河南新太行电源股份有限公司
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