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High specific energy lithium-ion power battery and preparation method thereof

A power battery and lithium-ion technology, which is applied in the field of high specific energy lithium-ion power battery and its preparation, can solve problems such as cycle life, rate, and low temperature effects, and achieve the effects of shortening mixing time, improving production efficiency, and simple process

Inactive Publication Date: 2017-01-04
江苏海四达电源有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high volume expansion effect of this material during the charge-discharge cycle affects its cycle life, rate, low temperature and other characteristics.

Method used

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  • High specific energy lithium-ion power battery and preparation method thereof
  • High specific energy lithium-ion power battery and preparation method thereof
  • High specific energy lithium-ion power battery and preparation method thereof

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preparation example Construction

[0021] The invention provides a preparation method of a high specific energy lithium ion power battery, comprising:

[0022] 1) Coating the positive electrode slurry on both sides of the positive electrode current collector, followed by drying, rolling, slitting, and sheeting to obtain positive electrode sheets;

[0023] 2) Coating the negative electrode slurry on both sides of the negative electrode current collector, followed by drying, rolling, slitting, and sheeting to obtain negative electrode sheets;

[0024] 3) Make the positive electrode sheet, diaphragm, and negative electrode sheet into an electrode group, then put the electrode assembly into the steel shell and roll the bottom;

[0025] 4) Inject the electrolyte into the steel case, and then cover, press and seal to make a cell;

[0026] 5) Using step current to preform the cells to produce high specific energy lithium-ion power batteries;

[0027] Wherein, the positive electrode slurry contains the positive elect...

Embodiment 1

[0054] 1) Carry out the preparation of positive plate according to the following steps:

[0055] a. Weigh the following solid raw materials according to the mass fraction ratio: modified NCM811 96.4%, SP 1.0%, graphene 0.6%, PVDF 5130 2.0%, and put each solid raw material in a vacuum oven at 120°C, and mix the materials for 240min. Vacuum degree≤-0.08MPa; then weigh the organic solvent N-methylpyrrolidone NMP whose mass fraction is 2 / 3 of the sum of the mass of the above four raw materials.

[0056] b, join modified NCM811, Super-P, graphene, PVDF 5130 in the vacuum mixer, the vacuum mixer rotates at 900RPM and stirs for 60min; then adds 60% by weight of organic solvent NMP, the vacuum mixer rotates at 1500RPM and stirs for 90min, and the stirring temperature is controlled at Below 50°C; then add 30% by weight of organic solvent NMP, the vacuum mixer rotates at 1500RPM and stir for 90min, and the stirring temperature is controlled below 50°C; finally add the remaining 10% by w...

Embodiment 2

[0077] Prepare a high specific energy lithium-ion power battery according to the method of Example 1, the difference is that the components and mass ratio of the positive electrode slurry material are: modified NCM811 96.0%, SP 1.0%, graphene 1.0%, PVDF 5130 2.0% , the components and mass ratio of the negative electrode slurry material are: modified silicon-carbon composite material 95.0%, SP 0.5%, KS 0.5%, PAA 2.0%, styrene-butadiene rubber 2.0%; the compacted density of the positive electrode plate is 3.37g / cm 3 , surface density is 240.6g / cm 2 ; The compacted density of the negative electrode sheet is 1.58g / cm 3 , surface density is 68.7g / cm 2 .

[0078] The test shows that the battery prepared in this case meets the following properties: the battery capacity is 3.8Ah, the weight is 46.70g, and the specific energy is 301.1Wh / kg. At the same time, the battery prepared in this case also has the following properties: cycle life ≥ 1500 times, -20°C low-temperature discharg...

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Abstract

The invention discloses a high specific energy lithium-ion power battery and a preparation method thereof. The preparation method includes the steps: 1) coating the front and the back of a positive current collector with positive slurry, and performing drying, rolling, slitting and flaking to obtain a positive plate; 2) coating the front and the back of a negative current collector with negative slurry, and performing drying, rolling, slitting and flaking to obtain a negative plate; 3) forming a set by the positive plate, a diaphragm and the negative plate, placing the set into a steel shell and abutting the set to a rolling groove; 4) injecting electrolyte into the steel shell, and then performing capping, pressing and sealing to form a cell; 5) pre-forming the cell by grading current to prepare the high specific energy lithium-ion power battery. The high specific energy lithium-ion power battery prepared by the method has excellent specific energy, long cycle life and high high-low temperature initial capacity, and the preparation method is simple in process and easy to operate and industrialize.

Description

technical field [0001] The invention relates to a lithium ion power battery, in particular to a high specific energy lithium ion power battery and a preparation method thereof. Background technique [0002] At present, the pure electric vehicle products sold in the domestic new energy vehicle market are becoming more and more abundant, but the cruising range of most pure electric vehicles is less than 200 kilometers, and there are only a handful of pure electric vehicles with a cruising range of more than 300 kilometers. In view of the key role of power batteries in the development of the electric vehicle industry, developed countries in the world have attached great importance to the research and development of high specific energy power batteries, and set the specific energy development target of batteries in 2020 as 250-350Wh / kg. [0003] From the perspective of high specific energy, high safety and the development status of the material industry of lithium-ion power batt...

Claims

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Application Information

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IPC IPC(8): H01M10/058H01M4/139H01M10/0525H01M4/36
CPCH01M4/139H01M4/366H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 沈晓彦葛国杰周建新赵冲王兴威唐琛明
Owner 江苏海四达电源有限公司
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