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Lithium-ion secondary battery and negative electrode sheet thereof

A technology of secondary battery and negative electrode sheet, which is applied in the direction of secondary battery, battery electrode, non-aqueous electrolyte battery electrode, etc., can solve the problems of increasing battery production cost, low battery coulomb efficiency, and complicated process, such as high temperature curing process of electrode piece, etc. To achieve the effect of reducing production cost, improving bonding effect and reducing production process

Active Publication Date: 2018-02-27
DONGGUAN AMPEREX TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the limitation of the high temperature curing process makes polyamic acid still have many unreacted carboxyl groups and N-H bonds during the curing process, which leads to the low coulombic efficiency of the battery
In addition, the complex high-temperature curing process of the pole piece also increases the production cost of the battery

Method used

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  • Lithium-ion secondary battery and negative electrode sheet thereof
  • Lithium-ion secondary battery and negative electrode sheet thereof
  • Lithium-ion secondary battery and negative electrode sheet thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Preparation of positive electrode sheet: Lithium cobalt oxide, conductive agent SuperP, and binder PVDF are mixed uniformly at a mass ratio of 96:2.0:2.0 to make a certain viscosity lithium ion secondary battery positive electrode slurry, which is coated on the current collector aluminum foil. Its coating weight is 0.0194g / cm 2 , after drying at 85°C, cold pressing; then trimming, cutting, and slitting, drying at 85°C for 4 hours under vacuum conditions, welding the tabs, and making a lithium-ion secondary battery positive electrode that meets the requirements piece.

[0036] Preparation of negative electrode sheet: Graphite, silicon, conductive agent SuperP, and soluble polyarimide shown in structural formula 1g were made into slurry at a mass ratio of 85.0:10.0:2.0:3.0, coated on the current collector copper foil and heated at 85 Drying at ℃, the coating weight is 0.0089g / cm 2 ; After trimming, cutting, and slitting, dry at 110° C. for 4 hours under vacuum condition...

Embodiment 2

[0041] A lithium-ion secondary battery was prepared with reference to the method of Example 1, except that the soluble polyarimide shown in structural formula 1a was used instead of the soluble polyarimide in Example 1 when preparing the negative electrode sheet of the lithium-ion secondary battery. The molecular weight of the soluble polyarimide shown in structural formula 1a is 35,000, the tensile strength is 213 MPa, and the elongation at break is 113%.

Embodiment 3

[0043] The lithium ion secondary battery was prepared with reference to the method of Example 1, except that the soluble polyarimide shown in the structural formula 1i was used instead of the soluble polyarimide in Example 1 when preparing the negative electrode sheet of the lithium ion secondary battery. The molecular weight of the soluble polyarimide shown in structural formula 1i is 33,000, the tensile strength is 193 MPa, and the elongation at break is 125%.

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Abstract

The invention discloses a lithium ion secondary battery and a negative pole thereof. The negative pole comprises a negative current collector and a negative diaphragm coated on the negative current collector, wherein the negative diaphragm comprises a negative active material, a conductive agent and an adhesive, the adhesive is soluble aromatic polyamideimide, and the lithium ion secondary battery is a lithium ion secondary battery using the negative pole. Compared with the prior art, the lithium ion secondary battery has the advantages that the soluble aromatic polyamideimide is adopted as the negative adhesive of the lithium ion secondary battery, the volume change of the lithium ion secondary battery in a lithium removing and embedding process can be inhibited, and the adhesion function between the negative diaphragm and the negative current collector is improved, thus the cycle performance of the lithium ion secondary battery can be improved.

Description

technical field [0001] The invention belongs to the field of lithium-ion secondary batteries, and more specifically, the invention relates to a lithium-ion secondary battery capable of suppressing silicon expansion and a negative electrode sheet thereof. Background technique [0002] Lithium-ion secondary batteries are widely used due to their advantages of high working voltage, long life and fast charging speed. However, with the continuous multi-functionalization and refinement of various portable electronic devices, the energy Density is also making higher and higher demands. In order to achieve the purpose of improving the energy density of lithium-ion secondary batteries, at present, a large amount of research work is concentrated on several key materials such as positive electrode sheet, negative electrode sheet, separator and electrolyte of lithium-ion secondary battery. [0003] In terms of negative electrode active materials, through the unremitting efforts of grap...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/13
CPCH01M4/134H01M4/622H01M10/0525Y02E60/10
Inventor 褚春波付成华朱立坤
Owner DONGGUAN AMPEREX TECH
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