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Lithium ion power battery and preparation method thereof

A power battery, lithium ion technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of high raw material cost, explosion and fire, thermal diffusion, etc. cooling effect

Inactive Publication Date: 2017-07-28
广西卓能新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the processing performance of existing lithium-ion power batteries is not stable
Because ternary materials have high requirements on the humidity of the production environment, the slurry is prone to thicken after absorbing water, resulting in unstable coating surface density, and the qualified rate of the produced products is lower than 90%.
At the same time, the safety performance and high-rate charge-discharge cycle performance of existing products are poor. The specific performance is: the thermal stability of the battery is poor, and thermal diffusion is prone to occur after an internal short circuit, resulting in explosion and fire; the cycle performance of the battery is poor, 1C charge 3C discharge Less than 1000 cycles; low power performance, weight ratio power as low as 576Wh / Kg; high cost of raw materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] A lithium-ion power battery is prepared according to the following steps:

[0050] 1) Preparation of positive electrode sheet: take 98.74 parts by weight of LiNi 0.89 co 0.09 al 0.02 o 2 , 0.03 parts by weight of single-walled carbon nanotubes; 0.03 parts by weight of graphene; 1.2 parts by weight of polyvinylidene fluoride is placed in a double planetary mixer, and the revolution speed is 25r / min, and it is made for 40min; then N- Methylpyrrolidone, under the conditions of revolution speed 48r / min and autorotation speed 1700r / min, beat for 90min to make a slurry, and then disperse it with a high-speed disperser at a speed of 3500±500r / min until the viscosity Reach 6000±1000mPa.s; Next, use spraying equipment to coat the positive electrode slurry on the front and back sides of the aluminum foil with a thickness of 14-18μm according to the single-sided density of 195-205g / ㎡, and dry it to make a pole piece ( Moisture content≤0.1%); then rolling, the compacted density...

Embodiment 2

[0057] The difference between embodiment 2 and embodiment 1 is:

[0058] The positive electrode slurry is prepared from the following components by weight percentage: LiNi 0.89 co 0.09 al 0.02 o 2 98.83%; single-walled carbon nanotubes 0.04%; graphene 0.03%; polyvinylidene fluoride 1.1%;

[0059] The negative electrode slurry is prepared from the following components in terms of weight percentage: 96.3% carbon (graphene and graphite composite material), 1.5% sodium carboxymethylcellulose (CMC), and 2.2% styrene-butadiene rubber (SBR).

[0060] A performance test was performed on the lithium-ion power battery of Example 2, and the test method was carried out according to "GB / T 31485-2015 Safety Requirements and Test Methods for Power Batteries for Electric Vehicles". The results show that the lithium-ion power battery of Example 2 has high safety performance and good thermal stability; excellent cycle performance, 1C charge and 1C discharge for more than 1200 cycles, weight...

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Abstract

The invention discloses a lithium ion power battery comprising a positive electrode plate and a negative electrode plate, wherein the positive electrode plate comprises a positive electrode current collector and a positive electrode paste arranged on the surface of the positive electrode current collector, and the positive electrode paste is prepared from the following components by weight percent: 98.6 to 99.16% of LiNi1-X-YCoxAlyO2, 0.02 to 0.05% of single-walled carbon nanotubes, 0.02 to 0.05% of grapheme, and 0.8 to 1.3% of polyvinylidene fluoride; the negative electrode plate comprises a negative electrode current collector and a negative electrode paste arranged on the surface of the negative electrode current collector, and the negative electrode paste is prepared from the following components by weight percent: 96.3 to 97% of graphite material, 1.3 to 1.5% of sodium carboxymethyl cellulose, and 1.7 to 2.2% of styrene butadiene rubber. The invention also provides a method for preparing the battery. The lithium ion power battery has the advantages of excellent isotropic electrical and thermal conductivity, smaller size and weight, and long service life.

Description

technical field [0001] The invention relates to a lithium-ion power battery and a preparation method thereof, belonging to the technical field of batteries. Background technique [0002] Lithium-ion power battery is a new type of high-energy battery successfully developed in the 20th century. Because of its advantages such as high energy, high battery voltage, wide operating temperature range, and long storage life, it has been widely used in military and civilian small electrical appliances. [0003] At present, there are mainly three schools of technical routes for cathode materials for power lithium batteries at home and abroad: lithium iron phosphate school, lithium manganate school, and ternary school. Among them, the lithium iron phosphate battery as the positive electrode material has a long charge-discharge cycle life, but its disadvantages are that there is a large gap in energy density, high and low temperature performance, and charge-discharge rate characteristics...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M4/525H01M4/583H01M4/62B82Y30/00
CPCB82Y30/00H01M4/525H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 刘国壮黄连芳江丽金余云王红强杨祖盛黄定东
Owner 广西卓能新能源科技有限公司
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