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High-capacity lithium-ion power battery for electromobiles and preparation method thereof

A technology for electric vehicles and power batteries, which is applied in the field of high-capacity lithium-ion power batteries for electric vehicles and its preparation, can solve problems such as low energy density, reduced battery life, and increased battery polarization, achieving high energy density, Long life cycle performance, high safety performance effect

Inactive Publication Date: 2017-01-11
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

[0003] 1. At the current stage, the energy density of 18650 lithium-ion power batteries for vehicles reaches about 200Wh / kg, and the energy density decreases to about 170Wh / kg after the batteries are grouped, which is relatively low for the high mileage pursued by existing electric vehicle manufacturers
[0004] 2. At this stage, after 1000 cycles of the 18650 lithium-ion power battery for vehicles, the internal polarization of the battery increases, the internal resistance becomes larger, and the electrolyte and positive and negative electrode materials are lost, resulting in a decrease in the service life of the battery and the discharge capacity of the single battery. reduce

Method used

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  • High-capacity lithium-ion power battery for electromobiles and preparation method thereof
  • High-capacity lithium-ion power battery for electromobiles and preparation method thereof

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preparation example Construction

[0023] The invention provides a method for preparing a high-capacity lithium-ion power battery for electric vehicles, comprising:

[0024] 1) Add PVDF 5130 to NMP (N-methylpyrrolidone) and stir to make positive glue, then add graphene to the positive glue, then add positive active material (improved NCA), then add NMP to adjust the solid content and Viscosity, sieving and sieving, and finally smearing the sieving material on the front and back of the aluminum foil and drying, rolling, slitting, and sheeting to obtain the positive electrode sheet;

[0025] 2) Add CMC and Super P to NMP and stir to make negative electrode glue, then put the negative electrode active material (silicon-carbon composite material) into the negative electrode glue, then add SBR and NMP to adjust the solid content and viscosity, and then sieve to get the sieve Discharge, and finally apply the sieved material on the front and back of the copper foil and dry, roll, slitting, and sheeting to obtain the n...

preparation example 1

[0049] Preparation of positive electrode active material (improved NCA):

[0050] 1) Mix LiOH and NCA ternary precursors evenly and then mix them with KCl in a three-dimensional mixing tank at a ratio of 1:3 to obtain a mixture.

[0051] 2) The above compound is sintered at 1000°C, cooled and crushed with a universal crusher to obtain the primary sintered product

[0052] 3) washing the primary sintered product with distilled water, filtering; drying the filtered product in a desiccator, and then secondary sintering at 850°C and crushing with a universal crusher to obtain a secondary sintered product;

[0053] 4) The conventional NCA ternary positive electrode material and the secondary sintered material (ternary positive electrode material prepared by the molten salt medium method) were uniformly mixed in a three-dimensional cone mixer according to a mass ratio of 1:1 to obtain a positive electrode active material.

preparation example 2

[0055] Preparation of negative electrode active material (silicon-carbon composite material):

[0056] 1) taking bacterial cellulose and stirring at a high speed in a reaction vessel to obtain bacterial cellulose slurry;

[0057] 2) Disperse the bacterial cellulose slurry and nano-scale silicon in polyethylene glycol, stir at high speed for 16 hours, then filter, and wash the filter cake with polyethylene glycol;

[0058] 3) The washed filter cake was transferred to a tube furnace, and calcined at 1400° C. for 12 hours in an N / H mixed gas atmosphere to obtain a silicon-carbon composite material.

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Abstract

The invention discloses a high-capacity lithium-ion power battery for electromobiles and a preparation method thereof. The method comprises the following steps: 1) adding PVDF (polyvinylidene fluoride) 5130 into NMP (N-methylpyrrolidone), stirring to obtain positive pole glue, adding graphene into the positive pole glue, adding a positive pole active substance, adding NMP to regulate the solid content and viscosity, screening, taking out the screened material, spreading the screened material on the front and back surfaces of aluminum foil, and carrying out drying, rolling, stripping and tabletting to obtain the positive pole tablets; 2) adding CMC (carboxymethyl cellulose) and Super P into NMP, stirring to obtain negative pole glue, adding a negative pole active substance into the negative pole glue, adding SBR (styrene butadiene rubber) and NMP to regulate the solid content and viscosity, screening, taking the screened material, and finally, spreading the screened material on the front and back surfaces of copper foil to obtain negative pole tablets; 3) assembling the battery; and 4) carrying out formation. The high-capacity lithium-ion power battery for electromobiles has the advantages of excellent energy density, long service life, high cycle performance and high safety.

Description

technical field [0001] The invention relates to a lithium-ion power battery, in particular to a lithium-ion power battery for a high-capacity electric vehicle and a preparation method thereof. Background technique [0002] As my country's dependence on foreign oil is increasing year by year, the energy security situation is severe, and smog occurs frequently. The sustainable development of the traditional automobile industry is facing energy and environmental challenges. The development of new energy vehicles has become a global consensus. At present, pure electric vehicles mainly use 18650 lithium-ion power batteries or lithium iron phosphate square batteries. Compared with 18650 lithium-ion power batteries for vehicles, lithium iron phosphate square batteries have disadvantages such as low energy density. The energy density of power batteries has reached about 200Wh / kg. However, there are still some problems in the actual application of batteries in electric vehicles, such...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/485H01M4/525H01M4/587H01M10/0525H01M10/058
CPCH01M4/362H01M4/386H01M4/485H01M4/525H01M4/587H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 沈晓彦陆佳华周建新王兴威唐琛明
Owner 江苏海四达电源有限公司