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Battery cathode plate, method of manufacturing same, lithium ion battery, and method of manufacturing same

A technology of battery positive electrode and battery negative electrode, which is applied in the manufacture of electrolyte batteries, battery electrodes, electrode carriers/current collectors, etc., can solve the problems of small capacity of lithium ion batteries, and achieve outstanding rate performance, reliable safety performance, and increase the amount of dressing. Effect

Inactive Publication Date: 2019-03-01
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 cathode plate, method of manufacturing same, lithium ion battery, and method of manufacturing same
  • Battery cathode plate, method of manufacturing same, lithium ion battery, and method of manufacturing same
  • Battery cathode plate, method of manufacturing same, lithium ion battery, and method of manufacturing same

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Effect test

Embodiment 1

[0128] The preparation of the battery negative plate 3: first mix the suspending agent CMC dry powder and deionized water with a weight percentage of 1.5%wt to make a suspension agent glue with a solid content of 1.5%, and add 94.8% graphite powder, 1.5% by weight % conductive graphite and 2.2% SBR were mixed, then deionized water was added and mixed evenly to prepare negative electrode slurry with a solid content of 50%. The negative electrode slurry is gap-coated on a metal copper foil with a thickness of 8 μm. After drying at a temperature of 100-130° C., it is rolled into a second sheet with a thickness of about 111 μm. The design compaction density of the second sheet is Not higher than 1.7g / cm 3 , cut into long strips, the width of the cut piece 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.

[0129] The preparation of battery positive sheet 1: first mix the binder PVDF dry powder of 3.0%wt b...

Embodiment 2

[0133] The preparation of the battery negative plate 3: first mix the suspending agent CMC dry powder and deionized water with a weight percentage of 1.8%wt to make a suspension agent glue with a solid content of 1.5%, and add a weight percentage of 95.2% graphite powder, 1.0 % conductive graphite and 2.0% SBR were mixed, then deionized water was added and mixed evenly to prepare a negative electrode slurry with a solid content of 48%. The negative electrode slurry is gap-coated on a metal copper foil with a thickness of 8 μm, dried at a temperature of 100-130° C., and then rolled into a second sheet with a thickness of about 115 μm. The design compaction density of the second sheet is not Higher than 1.7g / cm 3 . The second sheet was cut into long strips with a width of 66.5 mm, and the negative tab 31 was welded to the gap foil to make the battery negative sheet 3 .

[0134] The preparation of battery positive sheet 1: first mix the binder PVDF dry powder of 2.8%wt by weigh...

Embodiment 3

[0138] The preparation of the battery negative plate 3: first mix the suspending agent CMC dry powder and deionized water with a weight percentage of 2.0%wt to make a suspending agent glue with a solid content of 1.5%, and add a weight percentage of 95.4% graphite powder, 0.8 % conductive graphite and 1.8% SBR were mixed, then deionized water was added and mixed evenly to prepare a negative electrode slurry with a solid content of 49%. The negative electrode slurry is gap-coated on a metal copper foil with a thickness of 8 μm, dried at a temperature of 100-130° C., and then rolled into a second sheet with a thickness of about 116 μm. The design compaction density of the second sheet is not Higher than 1.7g / cm 3 . The second sheet was cut into long strips with a width of 66.5 mm, and the negative tab 31 was welded to the gap foil to make the battery negative sheet 3 .

[0139] The preparation of battery positive electrode sheet 1: first mix the binder PVDF dry powder of 2.8%w...

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Abstract

The invention belongs to the field of batteries, and discloses a battery cathode plate, a method of manufacturing same, a lithium ion battery, and a method of manufacturing same. The battery cathode plate has width of 65 + / - 5 mm and includes a cathode metal base plate, a cathode lug conductively connected thereto, and a cathode coating applied to the outer side of the cathode metal base plate; wherein the cathode coating includes, by weight, 88.0-98.6% of a cathode active substance, 1.0-7.0% of a cathode adhesive, and 0.4-14.0% of a cathode conductive agent. The cathode active substance is aphosphate material. The cathode conductive agent includes at least one of a granular cathode conductive agent and a fiber-like cathode conductive agent. By means of the phosphate material, the capacity of the battery can reach 2000 mAh. The lithium ion battery has long cycle life, excellent rate capability and reliable safety.

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] With the continuous development of the lithium-ion battery industry, 18650 lithium-ion batteries (battery diameter 18mm, height 65mm) have become the preferred model in the field of battery packaging due to their standardized size and flexible grouping methods. In the prior art, the width of the positive plate of the 18650 lithium-ion battery is 55mm-56mm. However, due to the limitation of the technical level of lithium battery raw materials, the capacity of the 18650 lithium-ion battery is limited and the energy density is low, so it is difficult to increase and meet the requirements. Market requirements for battery capacity. Contents of...

Claims

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Application Information

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IPC IPC(8): H01M4/136H01M4/1397H01M4/58H01M4/62H01M4/72H01M10/0525H01M10/058
CPCH01M4/136H01M4/1397H01M4/5825H01M4/622H01M4/623H01M4/625H01M4/72H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 黄国文李亮欧瑞先
Owner SHENZHEN ZHUONENG NEW ENERGY TECH
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