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A lithium-ion power battery with long service life and preparation method thereof

A power battery and lithium-ion technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as low power performance, unstable coating surface density, explosion and fire, etc., and achieve the effect of multiplier, cycle improvement, and dispersed processing Good, the effect of increasing the ratio of active substances

Active Publication Date: 2018-12-25
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: in the battery acupuncture test, the pass rate is low; 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 5C discharge is less than 1000 cycles; the power performance is low, the battery discharge platform is as low as 3.6V, and the weight specific power is as low as 576Wh / Kg

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0035] A preparation method of a lithium-ion power battery with long service life, comprising the following steps:

[0036] 1) Preparation of positive electrode sheet: put the formula amount of lithium trinickel cobalt manganese oxide, single-walled carbon nanotubes and polyvinylidene fluoride in a mixer, after mixing evenly, add the first solvent, and continue mixing to obtain positive electrode slurry material, and then disperse; then, spray the dispersed positive electrode slurry on the surface of the positive electrode current collector, dry, and compact to obtain the positive electrode sheet;

[0037] 2) Prepare the negative electrode sheet: put the graphene, graphite composite material, and sodium carboxymethyl cellulose in the mixer in the formula amount, and after mixing evenly, add the second solvent and styrene-butadiene rubber, and continue mixing to obtain the negative electrode slurry material, and then disperse; then, spray the dispersed negative electrode slurry...

Embodiment 1

[0042] A lithium-ion power battery with long service life is prepared according to the following steps:

[0043] 1) Preparation of positive electrode sheet: 98.65% of nickel-cobalt-manganese oxide (nickel-cobalt-manganese ratio 1:1:1), 0.05% of single-walled carbon nanotubes and 1.3% of polyvinylidene fluoride (PVDF) were placed in double In the planetary mixer, under the condition of revolution speed of 25r / min, grind for 40min; then add solvent, under the condition of revolution speed of 48r / min, rotation speed of 1700r / min, beat for 90min to make slurry , and then use a high-speed disperser to disperse at a speed of 3500±500r / min until the viscosity reaches 6000±1000mPa.s; then, use a spraying equipment to coat the positive electrode slurry on a surface with a thickness of 220-250g / ㎡. Dry on 12-16μm aluminum foil to make pole pieces (water content ≤0.1%); then roll to make active material with a compacted density of 3.45-3.65g / mm 3 The positive plate of the positive plate ...

Embodiment 2

[0050] The difference between embodiment 2 and embodiment 1 is:

[0051] The positive electrode slurry is prepared from the following components in terms of weight percentage: nickel-cobalt-manganese lithium manganate (nickel-cobalt-manganese ratio 1:1:1) 99%, single-walled carbon nanotubes 0.03%, polyvinylidene fluoride (PVDF) 0.97%;

[0052] The negative electrode slurry is prepared from the following components in terms of weight percentage: 97% carbon (graphene and graphite composite material), 1.5% sodium carboxymethylcellulose (CMC), and 1.5% styrene-butadiene rubber (SBR).

[0053] 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, 100% pass in the acupuncture test, and good thermal stability; excellent ...

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Abstract

The invention discloses a lithium ion power battery with long service life. The lithium ion power battery comprises a cathode plate and an anode plate, wherein the cathode plate comprises a cathode current collector and a cathode paste; the cathode paste is arranged on the surface of the cathode current collector, and comprises the following components of 98.65% to 99.18% of lithium nickel manganese cobalt, 0.02% to 0.05% of single-wall carbon nanotube, and 0.8 to 1.3% of polyvinylidene fluoride; the anode plate comprises an anode current collector and an anode paste; the anode paste is arranged on the surface of the anode current collector, and comprises the following components of 97 to 97.4% of graphene and graphite composite material, 1.3 to 1.5% of sodium carboxymethylcellulose, and 1.3 to 1.5% of butadiene styrene rubber. The lithium ion power battery has the advantages that the safety property is high, the passing rate of puncturing experiment is high, and the thermal stability is improved; the charging and discharging rate is large, the gravimetric specific power is large, the circulating property is excellent, and the service life is long. The invention also discloses a preparation method of the lithium ion power battery with the long service life. The preparation method has the advantages that the process is simple, the efficiency is high, the safety is realized, and the operability is strong.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a lithium-ion power battery with long service life and a preparation method thereof. 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] For lithium-ion power batteries, the positive electrode material can be a ternary composite material. The ternary composite positive electrode material is made of nickel salt, cobalt salt, and manganese salt. The ratio of nickel, cobalt, and manganese can be adjusted according to actual needs. The battery with ternary material as the positive electrode is safer than lithium cobalt oxide battery. [0004] However, the processing performance of existin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0525H01M4/36H01M4/505H01M4/525H01M4/583H01M4/62
CPCH01M4/362H01M4/505H01M4/525H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 黄延新刘国壮
Owner 广西卓能新能源科技有限公司