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A kind of novel structure lithium-ion battery and preparation method thereof

A lithium-ion battery, a new structure technology, applied in the manufacture of electrolyte batteries, structural parts, electrode manufacturing, etc., can solve the problems of battery capacity attenuation, low energy density, etc., and achieve the effect of improving contact characteristics, good flexibility, and simple process

Active Publication Date: 2020-01-03
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the energy density of this kind of lithium-ion battery is low, and the battery capacity decays seriously under the condition of high current charging and discharging.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0021] In the specific implementation process, the preparation method of the novel structure lithium ion battery of the present invention sequentially deposits the negative electrode material, the separator material and the positive electrode material on the surface of the three-dimensional porous current collector to obtain the integrated structure new lithium ion battery, including the following steps:

[0022] (1) preparation of negative electrode material plating solution;

[0023] (2) Electrodeposit the negative electrode material layer on the surface of the three-dimensional porous current collector, and impregnate the separator layer and the positive electrode material layer in sequence; wherein, the thickness of the negative electrode material layer is 0.05-3 μm, the thickness of the separator material is 0.5-30 μm, and the positive electrode material is filled with the current collector Three-dimensional pores to obtain integrated battery components;

[0024] (3) The ...

Embodiment 1

[0028] Prepare the negative electrode chemical plating solution according to the following formula: 1M (mol / L) hydrochloric acid, 50ml; SnCl 2 .2H 2 O, 25g / L; thiourea, 45g / L; citric acid, 30g / L; sodium hypophosphite, 40g / L; hydroquinone, 4.5g / L, and the balance is water. At 35°C, nickel foam was used as a current collector to electrolessly plate tin on its surface for 20 minutes.

[0029] Slowly add 2.0 g of polyvinylidene fluoride into 100 ml of nitrogen methyl pyrrolidone, and mix evenly by ball milling to obtain a diaphragm material coating solution. The above-mentioned tin-plated current collector was immersed in the diaphragm material coating solution for 120s, dried at 60°C for 20min, and repeated twice.

[0030] 2.4 grams of lithium iron phosphate nanoparticles, 0.3 grams of acetylene black, and 0.3 grams of polyvinylidene fluoride were slowly added to 20 ml of dimethylformamide in sequence, and mixed uniformly by ball milling to obtain a positive electrode material ...

Embodiment 2

[0035] Prepare negative electroless plating solution according to the following formula: 1M hydrochloric acid, 60ml; SnCl 2 .2H 2 O, 15g / L; AgNO 3 , 5g / L; thiourea, 55g / L; citric acid, 40g / L; sodium hypophosphite, 40g / L; hydroquinone, 6.5g / L, and the balance is water. At 30°C, nickel foam was used as a current collector to electrolessly plate tin silver on its surface for 10 min.

[0036] Slowly add 1.0 g of polyphenylene ether into 100 ml of nitrogen methyl pyrrolidone, and mix evenly by ball milling to obtain a diaphragm material coating solution. The above-mentioned tin-plated current collector was immersed in the diaphragm material coating solution for 100 seconds, dried at 60°C for 30 minutes, and repeated 4 times.

[0037] 2.4 grams of lithium iron phosphate nanoparticles, 0.3 grams of acetylene black, and 0.3 grams of polyvinylidene fluoride were slowly added to 20 ml of dimethylformamide in sequence, and mixed uniformly by ball milling to obtain a positive electrode...

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Abstract

The invention relates to the field of lithium ion batteries, in particular to a novel structure lithium ion battery and a preparation method thereof. The positive electrode, separator and negative electrode of lithium-ion batteries have an integrated structure of interpenetrating network. The negative electrode material, separator material and positive electrode material are sequentially deposited or coated on the surface of the current collector to form a three-layer laminated structure, and the interface between the three is in close contact. The negative electrode of the lithium-ion battery is prepared on the surface of the porous current collector by an electrochemical method, and the separator is directly formed on the surface of the negative electrode by solution impregnation. New lithium-ion battery. The invention integrates the positive electrode, the negative electrode and the separator of the lithium-ion battery, simplifies the internal structure and assembly process of the battery, and improves the interface contact characteristics between the electrode and the separator. The lithium-ion battery prepared by this method has excellent comprehensive performance and is easy to be large-scale production advantages.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a novel structure lithium ion battery and a preparation method thereof. Background technique [0002] Traditional lithium-ion batteries are mainly composed of four parts: positive electrode, negative electrode, electrolyte and separator. The electrode is mainly obtained by coating slurry on the surface of the current collector, drying, and compacting, and finally obtaining positive / negative electrode sheets. In the process of assembling the battery, it is necessary to align the separator between the positive and negative electrodes, and finally obtain the cell assembly through the lamination or winding process. The process of assembling the battery is cumbersome. And as the key material of lithium-ion batteries, commercialized lithium battery separators are mainly polyethylene and polypropylene microporous membranes, but due to the limitations of the properties of the membra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/058H01M4/04H01M2/14H01M10/0525H01M50/403H01M50/406H01M50/414H01M50/46
CPCH01M4/0404H01M4/0419H01M4/045H01M10/0525H01M10/058H01M50/403Y02E60/10Y02P70/50
Inventor 肖伟刘伟华王红赵丽娜刘建国严川伟
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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