Lithium-silicon supplementing material, preparation method thereof, electrode containing lithium-silicon supplementing material and battery

A silicon material and lithium-replenishing technology, applied in negative electrodes, battery electrodes, secondary batteries, etc., to achieve mild reaction conditions, improved electrical conductivity, and good economic benefits.

Active Publication Date: 2021-07-02
厦门高容纳米新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This is something that cannot be achieved by combining lithium sources directly with organic compounds in existing schemes.

Method used

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  • Lithium-silicon supplementing material, preparation method thereof, electrode containing lithium-silicon supplementing material and battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] First, under normal circumstances, 300g of nano-silicon was completely dissolved in 1500ml ethanol to obtain 20% solid content silicon slurry J1, the average particle size of nano-silicon was 50nm; then 60g of 1,5-dihydroxynaphthalene was weighed and completely dissolved. In 100ml of ethanol, 1,5-dihydroxynaphthalene solution was obtained;

[0055] Then, under normal circumstances, the obtained 1,5-dihydroxynaphthalene solution was added to the silicon slurry, mechanically stirred for 0.5h, and the mechanically stirred silicon slurry was homogenized by a homogenizer to obtain 1,5-dihydroxynaphthalene Silicon slurry K1 of hydroxynaphthalene;

[0056] Then in a normal environment, weigh 9g of lithium hydroxide and dissolve it completely in 100ml of ethanol to obtain a lithium hydroxide solution; add the lithium hydroxide solution to the slurry containing 1,5-dihydroxynaphthalene silicon, and mechanically stir the reaction 12h, to obtain lithium-supplementing silicon slur...

Embodiment 2

[0060] First, under normal circumstances, 300g of silicon carbon is completely dissolved in 900ml of ethanol to obtain 30% solid content of silicon carbon slurry J2; then 30g of 1,5-dihydroxynaphthalene is completely dissolved in 100ml of ethanol to obtain 1 , 5-dihydroxynaphthalene solution;

[0061] Then, under normal circumstances, the obtained 1,5-dihydroxynaphthalene solution was added to the silicon carbon slurry, mechanically stirred for 0.5h, and the mechanically stirred silicon carbon slurry was homogenized by a homogenizer to obtain 1,5 - silicon carbon paste K2 of dihydroxynaphthalene;

[0062] Then in a normal environment, the lithium hydroxide weighing 4.5g is completely dissolved in 100ml of ethanol to obtain a lithium hydroxide solution; the lithium hydroxide solution is added to the slurry containing 1,5-dihydroxynaphthalene silicon carbon, mechanically Stirring and reacting for 12 hours to obtain lithium-replenishing silicon-carbon slurry L2; then pass the li...

Embodiment 3

[0066] First, weigh 300g of silicon carbon with a silicon content of 5wt% and completely dissolve it in 900ml of ethanol under normal conditions to obtain a 30% solid content silicon carbon slurry J2; then weigh 30g of 1,5-dicarboxynaphthalene and completely dissolve it in 100ml of In ethanol, 1,5-dicarboxynaphthalene solution was obtained;

[0067] Then under normal circumstances, the obtained 1,5-dicarboxynaphthalene solution was added to the silicon carbon slurry, mechanically stirred for 0.5h, and the mechanically stirred silicon carbon slurry was homogenized by a homogenizer to obtain 1,5 - silicon carbon paste K2 of dicarboxynaphthalene;

[0068] Then in a normal environment, weigh 1g of lithium carbonate and dissolve it completely in 100ml of ethanol to obtain a lithium carbonate solution; add the lithium carbonate solution to the slurry containing 1,5-dicarboxynaphthalene silicon carbon, and react with mechanical stirring for 12h. Obtain the silicon carbon slurry L2 f...

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Abstract

The invention relates to a lithium-silicon supplementing material and a preparation method thereof, and an electrode and a battery containing the lithium-silicon supplementing material, and the preparation method comprises the following steps: uniformly dispersing a silicon-containing material in a solvent to obtain silicon slurry A; uniformly dispersing a polycyclic aromatic organic compound containing hydroxyl or carboxyl in a solvent to obtain a solution B; mixing the solution B with the silicon slurry A, and uniformly dispersing and reacting to obtain modified silicon slurry C; uniformly dispersing a lithium source in a solvent to obtain a solution D; uniformly mixing the solution D with the modified silicon slurry C, and reacting to obtain lithium-supplementing silicon slurry E; and drying the lithium-supplemented silicon slurry E to obtain the lithium-supplemented silicon powder. The lithium-silicon supplementing material prepared by the invention can be used as a lithium ion battery negative electrode material to improve the initial coulombic efficiency and electrochemical performance of a battery, and can effectively solve the problem of low initial coulombic efficiency of lithium ion battery silicon and silicon-containing negative electrodes, and the preparation method has the advantages of low environmental requirements, mild and simple process, controllable lithium supplementing quality, and good economical efficiency and safety.

Description

technical field [0001] The invention relates to a lithium ion battery negative electrode lithium supplement technology, in particular to a lithium supplement silicon material and a preparation method thereof, an electrode and a battery containing the lithium supplement silicon material. Background technique [0002] Lithium-ion batteries have the characteristics of high specific capacity, high voltage platform, and long cycle life. They are widely used in portable electronic 3C equipment, electric vehicles, ships, space technology, biomedical engineering, logistics, and national defense industries. The development of lithium-ion batteries with high energy density and high rate characteristics has always been the goal pursued by people, and the negative electrode material is one of the key factors determining the characteristics of lithium-ion batteries. [0003] As a negative electrode material with high specific capacity, silicon has a theoretical specific capacity of 4200m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/48H01M4/62H01M4/13H01M10/0525C01B33/02C01B33/12
CPCH01M4/386H01M4/483H01M4/625H01M4/628H01M4/13H01M10/0525C01B33/02C01B33/12H01M2004/021H01M2004/027Y02E60/10
Inventor 蒋玉雄王建林
Owner 厦门高容纳米新材料科技有限公司
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