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Method for producing high-capacity 18650 lithium ion battery

A technology of lithium-ion batteries and manufacturing methods, which is applied in the manufacture of electrolyte batteries, battery electrodes, secondary batteries, etc., can solve the problems of low capacity, high cost, and poor cycle stability of lithium cobalt oxide, and achieve high capacity, low cost, and The effect of high discharge specific capacity

Inactive Publication Date: 2018-09-07
JINCHUAN GROUP LIMITED +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problems of low capacity, high cost and poor cycle stability of lithium cobaltate, a commonly used positive electrode material for 18650 batteries, the present invention is made by adding different mass ratios of nickel-cobalt-manganese ternary battery materials to commonly used positive electrode material lithium cobaltate Composite materials, and change the mixing method of positive and negative electrodes, strive to maximize the capacity of the 18650 positive electrode active material, and improve the electrochemical performance

Method used

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  • Method for producing high-capacity 18650 lithium ion battery

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Embodiment 1

[0031] 1) Lithium cobalt oxide and ternary cathode material LiNi 0.5 co 0.2 mn 0.3 o 2 The mass ratio of the two positive electrode active materials is 1:4, and the mass percentage of the two positive electrode active materials is 97%, then weigh 1.3% of SP, 0.2% of KS-6, and 1.5% of polyvinylidene fluoride PVDFHSV900, and dry mix the above materials method to prepare positive electrode slurry. Coat the positive electrode slurry on a metal aluminum foil with a thickness of 16 μm to obtain a positive electrode sheet, place the positive electrode sheet in an oven at 80-105°C and vacuum-dry it, and roll it into a positive electrode sheet with a thickness of 0.138±2mm. Then, it is cut into pieces, divided into strips, welded with tabs, and glued to make a positive electrode sheet for use.

[0032] 2) 95% by mass of artificial graphite powder, 1.5% of CNT, 1.5% of carboxymethyl cellulose CMC and 2% of SBR were used to dry mix the above materials to make negative electrode slurr...

Embodiment 2

[0036] 1) Lithium cobalt oxide and ternary cathode material LiNi 0.6 co 0.2 mn 0.2 o 2 The mass ratio of the two positive electrode active materials is 3:7, and the mass percentage of the two positive electrode active materials is 96.5%, and then weigh 1.3% of SP, 0.2% of KS-6, and 2% of polyvinylidene fluoride PVDF HSV900, and mix the above materials according to dry Mixing method to make positive electrode slurry. Coat the positive electrode slurry on a metal aluminum foil with a thickness of 16 μm to obtain a positive electrode sheet, place the positive electrode sheet in an oven at 80-105°C and vacuum-dry it, and roll it into a positive electrode sheet with a thickness of 0.140±2mm. Then cut into pieces, divide into strips, weld the tabs, and paste the glue to make the positive electrode sheet of the battery cell for use.

[0037] 2) 95.5% by mass of artificial graphite powder, 1% of CNT, 1.5% of carboxymethyl cellulose CMC and 2% of SBR, and the above materials were m...

Embodiment 3

[0041] 1) Lithium cobalt oxide and ternary cathode material LiNi 0.6 co 0.2 mn 0.2 o 2 The mass ratio of the two positive electrode active materials is 2:3, and the mass percentage of the two positive electrode active materials is 97%, and then weigh 0.8% of SP, 0.2% of KS-6, and 2% of polyvinylidene fluoride PVDF HSV900. Mixing method to make positive electrode slurry. Coat the positive electrode slurry on a metal aluminum foil with a thickness of 16 μm to obtain a positive electrode sheet, place the positive electrode sheet in an oven at 80-105°C and vacuum-dry it, and roll it into a positive electrode sheet with a thickness of 0.140±2mm. Then cut into pieces, divide into strips, weld the tabs, and paste the glue to make the positive electrode sheet of the battery cell for use.

[0042] 2) The artificial graphite powder with a mass percentage of 96%, 0.5% CNT, 1% carboxymethyl cellulose CMC and 2.5% SBR were used to make negative electrode slurry by dry mixing the above ...

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Abstract

The invention provides a method for producing a high-capacity 18650 lithium ion battery. 1) A positive active material is a composite material with a ratio of LiNixCoyMnzO2 and lithium cobaltate as asupplement; 2) a binder for a positive electrode sheet is polyvinylidene fluoride, a composite conductive agent is superconducting carbon black SP or flake graphite KS-6; 3) the composite conductive agent on a negative electrode sheet of the battery is artificial graphite powder and carbon nanotube CNT, a thickening agent is CMC, and a binder is styrene-butadiene rubber; 4) the preparation of positive and negative electrode slurry adopts a dry mixing method; 5) the positive and negative electrode sheets of the battery are prepared; 6) the positive and negative electrode sheets are wound afterbeing added with diaphragms, put on surface pads and put into steel shells, a negative lug is spot-welded, and put into a rolling groove, the lug is picked, and a 70 plus or minus 5 Celsius system oven is filled with nitrogen for continuous drying to obtain a liquid core to be injected. The prepared battery core is injected into an electrolyte and sealed, the outer surface of the battery core is cleaned, and forming, capacity grading and aging are performed to prepare the lithium ion battery. The beneficial effects are that: the battery has the advantages of high discharge specific capacity, low cost, and good cycle stability.

Description

technical field [0001] The invention belongs to the technical field of manufacturing lithium-ion power batteries, and in particular relates to a method for manufacturing a high-capacity 18650 lithium-ion battery. Background technique [0002] The 18650 lithium-ion battery has the characteristics of large capacity, long life, and high safety performance, and because of its small size, light weight, and easy use, it is favored by consumers. Using 18650 batteries as the power source of new energy electric vehicles is the best choice at this stage. However, compared with other batteries, the discharge current of lithium-ion power batteries is relatively small, and the specific power is small. It is necessary to consider increasing the capacity of the battery to meet the requirements of electric vehicles. The current conventional battery cathode material is lithium cobalt oxide LiCoO 2 , its price is high, its capacity is low, and its cycle performance is lacking. The nickel-co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525H01M4/62H01M4/583H01M10/058H01M4/36
CPCH01M4/362H01M4/505H01M4/525H01M4/583H01M4/621H01M4/625H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 王凤邱平徐艳燕吴琼刘航马延会陈立斌
Owner JINCHUAN GROUP LIMITED
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