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Silicon-carbon composite negative electrode material, preparation method thereof, negative pole piece and lithium ion battery

A negative electrode material and silicon-carbon composite technology, applied in the direction of negative electrodes, battery electrodes, secondary batteries, etc., can solve the problems of low initial efficiency of materials, potential safety hazards, strong corrosion of equipment, etc., and achieve high consistency and low price. Inexpensive, high conductivity effect

Active Publication Date: 2020-02-28
JIAOZUO JUNENG ENERGY TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] For example, the Chinese invention patent application with the application publication number CN 105226285 A discloses a porous silicon-carbon composite material and its preparation method. react with an agent to remove the active metal, then wash the porous silicon nanomaterial with a hydrofluoric acid solution to remove silicon oxide, and then perform ball milling, polymer coating, carbonization, and finally obtain a porous silicon-carbon composite material, Although the expansion rate of the material is reduced and the specific capacity is improved, the preparation process using this method is complicated, and hydrofluoric acid is highly corrosive to equipment and may easily cause safety hazards. At the same time, the first-time efficiency of the prepared material is low, which affects its Application and promotion of materials in the field of lithium-ion batteries

Method used

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  • Silicon-carbon composite negative electrode material, preparation method thereof, negative pole piece and lithium ion battery
  • Silicon-carbon composite negative electrode material, preparation method thereof, negative pole piece and lithium ion battery
  • Silicon-carbon composite negative electrode material, preparation method thereof, negative pole piece and lithium ion battery

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Embodiment 1

[0041] The silicon-carbon composite negative electrode material in this embodiment is prepared by a method comprising the following steps:

[0042] 1) Weigh 500mL of ethanol, 15g of polystyrene microspheres (500nm), 2g of polyvinylpyrrolidone, 3g of carbon nanotubes and 15g of ammonium thioacetamide into a conical flask, stir well, and obtain organic base solution A;

[0043] 2) Afterwards, dissolve 75g of silicon acetate in 750g of diethyl ether to make a 10% solution, and slowly add it dropwise to the above-mentioned organic base solution A, stir evenly, and stir and heat in a water bath at 60°C for 2h, filter to take the solid ; The reaction equation of this step is as figure 2 shown;

[0044] 3) After that, add the filtered solid to excess tetrahydrofuran solution and soak for 6 hours, filter the solid and dry it in vacuum at 80°C to obtain the precursor material B;

[0045] 4) Then weigh 10g of magnesium powder and 15g of precursor material B and mix them evenly, then ...

Embodiment 2

[0048] The silicon-carbon composite negative electrode material in this embodiment is prepared by a method comprising the following steps:

[0049] 1) Weigh 500mL of ethanol, 10g of polystyrene microspheres (300nm), 1g of polyvinylpyrrolidone, 1g of carbon nanotubes and 10g of ammonium thioacetamide, and add them to a conical flask, and stir to obtain an organic base solution A;

[0050] 2) After that, weigh 50g of silicon acetate and dissolve it in 500mL of ether to form a 10% solution, and slowly add it dropwise to the above-mentioned organic base solution A. After stirring evenly, stir and heat in a water bath at 50°C for 6h, and filter take solid;

[0051] 3) Add excess tetrahydrofuran solution and soak for 6 hours, filter the solid and dry it in vacuum at 80°C to obtain precursor material B;

[0052] 4) After weighing 10g of magnesium powder and 10g of precursor material B, mix them evenly and transfer them to a tube furnace, and then undergo a magnesium thermal reaction (...

Embodiment 3

[0054] The silicon-carbon composite negative electrode material in this embodiment is prepared by a method comprising the following steps:

[0055] 1) In an Erlenmeyer flask, weigh 500ml of ethanol, 20g of polystyrene microspheres (600nm), 3g of polyvinylpyrrolidone, 5g of carbon nanotubes and 20g of ammonium thioacetamide and add them to the Erlenmeyer flask, stir well, Obtain organic base solution A;

[0056] 2) Afterwards, dissolve 100g of silicon acetate in 1000mL of diethyl ether to form a 10% solution, and slowly add it dropwise to the above-mentioned organic base solution A, stir evenly, and stir and heat in a water bath at 90°C for 1 hour, and filter to obtain the solid ;

[0057] 3) Add excess tetrahydrofuran solution and soak for 6 hours, filter the solid and dry it in vacuum at 80°C to obtain precursor material B;

[0058] 4) After weighing 10g of magnesium powder and 20g of precursor material B, mix them evenly and transfer them to a tube furnace, and then underg...

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Abstract

The invention relates to a silicon-carbon composite negative electrode material, a preparation method thereof, a negative pole piece and a lithium ion battery, and belongs to the technical field of lithium ion battery material preparation. According to the invention, a silane polymer is deposited on the surface of a template agent through a chemical bath method, thioacetamide and silicon acetate form a silane compound with a stable structure, carbon nano tubes are doped between the materials to form a network structure, then the template is dissolved through a solvent to obtain a porous silanecompound, namely, a silicon dioxide / carbon composite material, and then a silicon monoxide / carbon composite material is obtained through magnesiothermic reduction. The material is high in conductivity and large in specific surface area; and the preparation process is simple, high in consistency and easy to industrialize. The pole piece prepared from the silicon-carbon composite negative electrodematerial is high in liquid absorption and retention capacity and low in rebound rate; and the prepared battery is high in first discharge capacity, high in first efficiency and good in cycle performance.

Description

technical field [0001] The invention relates to a silicon-carbon composite negative electrode material, a preparation method thereof, a negative electrode sheet, and a lithium ion battery, and belongs to the technical field of lithium ion battery material preparation. Background technique [0002] Silicon carbon anode material is a new type of anode material developed in recent years. It has become a research hotspot due to its high specific capacity and wide range of sources, and has been applied to high specific energy density lithium-ion batteries. However, due to the poor electrical conductivity of the silicon material itself, coupled with the serious volume effect generated during the electrochemical intercalation and removal of lithium, the material structure is destroyed and mechanically pulverized, resulting in the separation between the electrode materials and the electrode materials and the current collector, thereby losing electrical contact. , resulting in a shar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/62H01M4/134H01M10/0525
CPCH01M4/134H01M4/386H01M4/625H01M4/628H01M10/0525H01M2004/027Y02E60/10
Inventor 和百正王峰
Owner JIAOZUO JUNENG ENERGY TECH
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