Positive paste of rapid-charge and rapid-discharge type high-power lithium ion battery and manufacturing method

A lithium-ion battery, high-power technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of battery capacity attenuation, lithium dendrite internal short circuit, battery polarization increase, etc.

Active Publication Date: 2018-07-06
FENGFAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, with the rapid development of electric tools, unmanned aerial vehicles, aircraft models, and new energy vehicles, especially with the batch application of lithium-ion batteries in HEV hybrid vehicles and 12V/48V vehicle start-stop systems, lithium-ion secondary The charging and discharging power requirements of the battery are getting higher and higher, and generally need to meet the 30-40C rate charging and discharging requirements, but it is difficult for commercial lithium-ion batteries to meet such high-power charging and discharging requirements.
[0003] The vehicle-mounted power lithium-ion battery needs to face three basic requirements: first, long life, the warranty period is generally required to be 5-8 years or 80,000-100,000 kilometers, but the lithium-ion battery is in the cycle of charging and discharging. The polarization of the battery will continue to increase, causing the battery life to not meet the usage requirements
The second is high power, but the lithium-ion battery will increase the polarization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Embodiment 1: a kind of positive paste paste of fast charge and fast discharge type high-power lithium ion battery, calculated by weight ratio, it includes lithium manganate LiMn of 15% 2 o 4 , 78's 333-type nickel-cobalt lithium manganate ternary material LiNi 0.33 co 0.33 mn 0.33 o 2 , 2 Ketjen Black, 3 Super-P and 2 modified polyvinylidene fluoride PVDF. Preferably, the lithium manganese oxide LiMn 2 o 4 The particle size distribution D50 is 7μm; the specific surface area BET is 0.2m 2 / g. Preferably, the 333-type nickel-cobalt lithium manganate ternary material LiNi 0.33 co 0.33 mn 0.33 o 2 The particle size distribution D50 is 2.8μm, and the specific surface area BET is 0.6m 2 / g.

[0048] The preparation method of the anode paste of the above-mentioned fast-charging and quick-discharging type high-power lithium ion battery, the solvent used during making is N-methylpyrrolidone NMP; It comprises the following steps:

[0049] A, the lithium manganese o...

Embodiment 2

[0051] Embodiment 2: a kind of paste paste for the positive pole of the high-power lithium-ion battery of quick-charge and quick-discharge type, calculate by weight ratio, comprise the lithium manganate LiMn of 28 2 o 4 , 66 type 523 nickel-cobalt-manganese ternary material LiNi 0.5 co 0.2 mn 0.3 o 2 , 1.5 carbon nanotubes, 2.5 Super-P and 2 modified polyvinylidene fluoride PVDF. Preferably, the lithium manganese oxide LiMn 2 o 4 The particle size distribution D50 is 13μm; the specific surface area BET is 0.37m 2 / g. Preferably, the LiNi 0.5 co 0.2 mn 0.3 o 2 The particle size distribution D50 is 5.5μm, and the specific surface area BET is 0.4m 2 / g.

[0052] The above-mentioned preparation method of fast charging and quick discharging type high-power lithium-ion battery positive paste paste, the solvent used during making is N-methylpyrrolidone NMP, and the dispersant is polyvinylpyrrolidone PVP; it comprises the following steps:

[0053] A, the amount of lithium ...

Embodiment 3

[0055] Embodiment 3: a kind of positive paste paste of fast charge and fast discharge type high-power lithium-ion battery, calculated by weight ratio, including lithium manganate LiMn of 35% 2 o 4 , 63 type 424 nickel cobalt lithium manganate ternary material LiNi 0.4 co 0.2 mn 0.4 o 2 , 1 carbon nanotube, 1.7 Super-P and 1 modified polyvinylidene fluoride PVDF. Preferably, the lithium manganese oxide LiMn 2 o 4 The particle size distribution D50 is 10μm; the specific surface area BET is 0.6m 2 / g. Preferably, the LiNi 0.4 co 0.2 mn 0.4 o 2 The particle size distribution D50 is 7μm, and the specific surface area BET is 1.0m 2 / g.

[0056] The above-mentioned preparation method of fast charging and quick discharging type high-power lithium-ion battery positive paste paste, the solvent used during making is N-methylpyrrolidone NMP, and the dispersant is polyvinylpyrrolidone PVP; it comprises the following steps:

[0057] A, the amount of lithium manganate LiMn 2 o...

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PUM

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Abstract

The invention discloses a positive paste of a rapid-charge and rapid-discharge type high-power lithium ion battery and a manufacturing method. The positive paste comprises 10 to 35 parts of an activesubstance A, 62 to 81 parts of an active substance B, 1 to 3 parts of a conductive agent A, 1 to 3 parts of a conductive agent B and 1 to 3 parts of an adhesive A, wherein the active substance A is lithium cobalt oxide LiCoO2, lithium nickelate LiNiO2, lithium manganate LiMn2O4, lithium iron phosphate LiFePO4, lithium manganese phosphate LiMnPO4, manganese lithium iron phosphate LiFexMn1-xPO4 or lithium vanadium phosphate Li3V2(PO4)3; the active substance B is lithium nickel-cobalt manganate LiNixCo1-x-yMnyO2, wherein x+y is smaller than 1; the conductive agent A is a Ketjen Black or carbon nanotube; the conductive agent B is graphene or Super-P; and the adhesive A is modified polyvinylidene fluoride PVDF. By adopting the lithium ion battery, high power, rapid charge and rapid discharge can be met, and the service life is long.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery preparation, and relates to a positive electrode paste of a fast-charging and fast-discharging high-power lithium-ion battery and a manufacturing method thereof. Background technique [0002] Lithium-ion secondary battery has now become the mainstream chemical power source, and is widely used in most mobile terminal equipment and new energy vehicles. Long life and other advantages. In recent years, with the rapid development of electric tools, unmanned aerial vehicles, aircraft models, and new energy vehicles, especially with the batch application of lithium-ion batteries in HEV hybrid vehicles and 12V / 48V vehicle start-stop systems, lithium-ion secondary The charging and discharging power requirements of the battery are getting higher and higher, and generally need to meet the 30-40C rate charging and discharging requirements, but it is difficult for commercial lithium-ion batteries ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525
CPCH01M4/362H01M4/505H01M4/525Y02E60/10
Inventor 石琛嵇雷国海鹏刘双合杨淑娟顾志华韩小勇
Owner FENGFAN
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