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An aqueous mineral binder for a silicon negative electrode of a lithium ion battery and a preparation method and application thereof

A technology of lithium-ion batteries and water-based minerals, applied in battery electrodes, nanotechnology for materials and surface science, secondary batteries, etc., can solve problems such as high cost and complicated preparation process, and achieve low production cost and simple operation , Improve the effect of adhesion

Inactive Publication Date: 2018-12-21
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a water-based mineral binder for the silicon negative electrode of lithium-ion batteries and its preparation method and application, which overcomes the disadvantages of complicated preparation process and high cost in the prior art

Method used

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  • An aqueous mineral binder for a silicon negative electrode of a lithium ion battery and a preparation method and application thereof
  • An aqueous mineral binder for a silicon negative electrode of a lithium ion battery and a preparation method and application thereof
  • An aqueous mineral binder for a silicon negative electrode of a lithium ion battery and a preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] (1) Dissolve 1g of polyacrylic acid (PAA) with a molecular weight of one hundred thousand and 1.5g of calcium chloride in 100ml of deionized water and stir for 10min, then dissolve 1.5g of sodium carbonate in 100ml of deionized water, and stir for 10min; then add sodium carbonate The solution was added to the PAA and calcium ion mixed solution and stirred for 1 hour to obtain a lumpy precipitate, which was washed with deionized water. The white lumps were the PAA / ACC hydrogel;

[0030] (2) Take 0.1g of PAA / ACC hydrogel, dissolve it in 0.1M hydrochloric acid solution, and stir for 2h to obtain a PAA / ACC solution;

[0031] (3) Weigh 40mg of silicon powder (particle size 100~700nm), 5mg of carbon black conductive agent, add them to a mortar, grind evenly, add 5mg of PAA / ACC solution; then stir for 12h to form a uniform slurry; Spread it on the copper foil of the current collector and place it in an ammonia atmosphere to react for 20 minutes; then place the pole piece in a vacuu...

Embodiment 2

[0038] (1) Dissolve 1g of 200,000 molecular weight polyacrylic acid (PAA) and 1.5g of calcium chloride in 100ml of deionized water, stir for 10min, then dissolve 1.5g of sodium carbonate in 100ml of deionized water, and stir for 10min; then add carbonic acid Add the sodium solution to the mixed solution of PAA and calcium ions, stir for 1 hour to obtain a lumpy precipitate, which is cleaned with deionized water. The white lumps are PAA / ACC hydrogel;

[0039] (2) Take 0.1g of PAA / ACC hydrogel, dissolve it in 0.1M hydrochloric acid solution, and stir for 2h to obtain a PAA / ACC solution;

[0040] (3) Weigh 40mg of silicon powder (particle size about 100-700nm) and 5mg of carbon black conductive agent, add them to a mortar, grind them evenly, add PAA / ACC solution (including PAA / ACC 5mg); then stir for 12h, A uniform slurry is formed; the slurry is spread on the copper foil of the current collector and placed in an ammonia atmosphere to react for 20 minutes; then the pole pieces are dri...

Embodiment 3

[0043] (1) Dissolve 2g of polyacrylic acid (PAA) with a molecular weight of 100,000 and 3g of calcium chloride in 100ml of deionized water and stir for 10min, then dissolve 3g of sodium carbonate in 100ml of deionized water, and stir for 10min; then add the sodium carbonate solution The mixed solution of PAA and calcium ions is stirred for 1 hour to obtain a lumpy precipitate, which is washed with deionized water. The white lumps are PAA / ACC hydrogel;

[0044] (2) Take 0.2g of PAA / ACC hydrogel, dissolve it in 0.1M sulfuric acid solution and stir for 2h to obtain a PAA / ACC solution;

[0045] (3) Weigh 40mg of silicon powder (particle size about 100-700nm) and 5mg of carbon black conductive agent, add them to a mortar, grind them evenly, add PAA / ACC solution (including PAA / ACC 5mg); then stir for 12h, A uniform slurry is formed; the slurry is spread on the current collector copper foil and placed under ammonium carbonate to react for 20 minutes; then the pole pieces are placed in a 9...

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Abstract

The invention relates to an aqueous mineral binder for a silicon negative electrode of a lithium ion battery, a preparation method and an application thereof, wherein the binder is a hydrogel obtainedby forming a physical crosslinking network through polyacrylic acid and amorphous calcium carbonate nanoparticles. The hydrogel obtained by the invention has high specific capacity, excellent cycle stability and rate performance when used as a binder material for a silicon negative electrode of a lithium ion battery. Adopting one-step mixing method to form gel has the advantages of simple operation, low production cost, low environmental pollution, easy batch production and large-scale production. It has a good industrial production foundation and broad application prospects.

Description

Technical field [0001] The invention belongs to the field of energy storage materials, and in particular relates to an aqueous mineral binder used for silicon negative electrodes of lithium ion batteries, and a preparation method and application thereof. Background technique [0002] In recent years, the rapid development of wearable electronic devices and electric vehicles has caused a large demand for lithium battery materials with high energy storage capacity and excellent cycle stability. Nowadays, because of its many advantages, such as high energy density, high efficiency, light weight and portability, lithium-ion batteries have been widely used in small electronic products, electric vehicles and other equipment. Silicon is a new type of negative electrode material for lithium-ion batteries. Due to its high theoretical specific capacity (4212mA h g -1 , While the theoretical capacity of graphite anode is only 372mAh g -1 ), suitable lithium insertion platform, abundant natu...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/134H01M4/1395H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/134H01M4/1395H01M4/621H01M4/622H01M10/0525Y02E60/10
Inventor 武培怡田萌
Owner DONGHUA UNIV
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