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Battery positive sheet, manufacturing method of battery positive sheet, lithium ion battery, and manufacturing method of lithium ion battery

A battery positive and negative electrode technology, applied in the direction of battery electrodes, electrode carriers/current collectors, secondary batteries, etc., can solve the problems of small capacity of lithium-ion batteries, and achieve the effects of reducing resistance, increasing the amount of dressing, and improving adhesion

Inactive Publication Date: 2019-03-08
SHENZHEN ZHUONENG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The first object of the present invention is to provide a battery positive plate, which aims to solve the technical problem of low capacity of existing lithium-ion batteries

Method used

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  • Battery positive sheet, manufacturing method of battery positive sheet, lithium ion battery, and manufacturing method of lithium ion battery
  • Battery positive sheet, manufacturing method of battery positive sheet, lithium ion battery, and manufacturing method of lithium ion battery
  • Battery positive sheet, manufacturing method of battery positive sheet, lithium ion battery, and manufacturing method of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0134] Preparation of battery negative electrode sheet 3: mix 1.5%wt of suspending agent dry powder, 94.5%wt of graphite powder, 2.0%wt of negative electrode conductive agent, and 2.0%wt of negative electrode binder, then add deionized water and mix evenly to make a solid Negative electrode slurry with a content of 50% is intermittently coated on a metal copper foil with a thickness of 8 μm, dried at a temperature of 100°C-130°C, rolled into a second sheet with a thickness of about 130 μm, and cut into long strips shape, the width of the cut sheet is 66.5mm, and the negative electrode tab 31 is welded at the gap foil to make the negative electrode sheet 3 of the battery.

[0135] Preparation of battery positive sheet 1: 2.0%wt of positive electrode binder dry powder, 3.0%wt of positive electrode conductive agent (wherein, 1.0%wt of granular positive electrode conductive agent, 2.0%wt of fibrous positive electrode conductive agent), 95.0% of positive electrode active material w...

Embodiment 2

[0139]Preparation of battery negative electrode sheet 3: mix suspending agent dry powder 1.4%wt, graphite powder 94.6%wt, conductive agent 2.1%wt, negative electrode binder 1.9%wt, add deionized water and mix evenly to make solid content It is a 48% negative electrode slurry, which is intermittently coated on a metal copper foil with a thickness of 8 μm. After drying at a temperature of 100°C-130°C, it is rolled into a second electrode sheet with a thickness of about 125 μm and cut into long strips. , the width of the cut sheet is 66.5mm, and the negative tab 31 is welded at the gap foil to make the negative electrode sheet 3 of the battery.

[0140] The preparation of positive electrode sheet 1 of the battery: dry powder of positive electrode binder 1.8%wt, positive electrode conductive agent 2.5%wt (wherein, granular positive electrode conductive agent 1.0%wt, fibrous positive electrode conductive agent 1.5%wt), positive electrode active material 95.7% Wt and an appropriate ...

Embodiment 3

[0144] The preparation of battery negative plate 3: mix 1.6%wt of suspending agent dry powder, 94.2%wt of graphite powder, 2.2%wt of negative electrode conductive agent, 2.0%wt of negative electrode binder, then add deionized water and mix evenly to make a solid The negative electrode slurry with a content of 52% is intermittently coated on a metal copper foil with a thickness of 8 μm. After drying at a temperature of 100°C-130°C, it is rolled into a second sheet with a thickness of about 135 μm and cut into strips shape, the width of the sheet body cut out is 66.5 mm, and the negative electrode tab 31 is welded at the gap foil to make the negative electrode sheet 3 of the battery.

[0145] The preparation of positive electrode sheet 1 of the battery: dry powder of positive electrode binder 2.2%wt, positive electrode conductive agent 2.5%wt (wherein, granular positive electrode conductive agent 0.8%wt, fibrous positive electrode conductive agent 1.7%wt), positive electrode acti...

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Abstract

The invention is applicable to the field of batteries, and discloses a battery positive sheet, a manufacturing method of the battery positive sheet, a lithium ion battery, and a manufacturing method of the lithium ion battery, wherein the battery positive electrode sheet has a width of 65 mm + / - 5 mm, and comprises a positive metal substrate, a positive tab electrically connected to the positive metal substrate, and a positive coating coated on the outside of the positive metal substrate; the positive coating comprises the following components by weight: a positive active material of 86.0% to98.6%, positive conductive agents of 0.4% to 16.0%, and a positive binder of 1.0% to 6.0%; and the positive conductive agents comprise at least one of a particulate positive conductive agent and a fibrous positive conductive agent. The invention performs optimal design on the width of the battery positive sheet and the positive coating on the battery positive sheet to improve the capacity of the battery positive sheet and reduce the resistance of the battery positive sheet, thereby facilitating the improvement of the capacity, circulation performance and safety performance of the lithium ion battery.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a battery positive electrode sheet, a method for manufacturing the battery positive electrode sheet, a lithium ion battery with the battery positive electrode sheet, and a manufacturing method for the lithium ion battery. Background technique [0002] In recent years, the market has become increasingly demanding on the cruising range of new energy vehicles. Therefore, the Ministry of Industry and Information Technology of the People's Republic of China has put forward specific requirements for the energy density of lithium-ion batteries, the power source of new energy vehicles. The body energy density reaches 300WH / kg. In the existing technology, the width of the positive plate of the 18650 lithium-ion battery is 55mm-56mm. Due to the bottleneck of the raw material technology of the lithium-ion battery, the energy density of the 18650 lithium-ion battery has reached the limit, and it is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/62H01M4/66H01M10/0525
CPCH01M4/38H01M4/621H01M4/624H01M4/625H01M4/667H01M10/0525Y02E60/10
Inventor 黄国文李亮欧瑞先
Owner SHENZHEN ZHUONENG NEW ENERGY TECH
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