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Copper-silicon negative electrode and preparation method therefor

A copper-silicon and anode technology, applied in electrode manufacturing, battery electrodes, electrical components, etc., can solve the problems of limited efficiency improvement of silicon anode materials, affecting the performance of lithium-ion batteries, reducing the conductivity of the pole piece, and reducing the thickness of the pole piece. , referring to the volume energy density, the effect of reducing the thickness of the pole piece

Inactive Publication Date: 2016-04-13
MICROVAST POWER SYST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods have limited efficiency improvement for silicon anode materials, and the cycle performance is not ideal.
[0008] Lithium-ion battery negative electrode sheet, especially the preparation of the negative electrode sheet that adopts silicon negative electrode active material mostly adopts above-mentioned conventional method, and the binding agent that this method adopts is organic polymer usually, has reduced the electrical conductivity of electrode sheet, and silicon material is in charging The irreversible change in volume and the swelling of the binder during the discharge process will lead to the shedding of the material, seriously affecting the performance of lithium-ion batteries

Method used

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  • Copper-silicon negative electrode and preparation method therefor
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Examples

Experimental program
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Effect test

Embodiment 1

[0065] The preparation of copper-silicon composite active material: copper acetate (31g) is completely dissolved in the mixed solution of dehydrated alcohol and deionized water as copper source, takes by weighing silicon powder (6g) and joins in the mixed solution of copper acetate, finally An aqueous polyacrylic acid solution (6 g) was added to the above solution as a surfactant. The prepared solution is prepared by spray drying, and the spray drying is carried out under nitrogen atmosphere at 160°C. Then, the composite material was kept at 300° C. under a hydrogen atmosphere for 6 hours to undergo a reduction reaction to prepare a copper-silicon composite.

[0066] Preparation of metal compound copper oxide: Weigh 40g of copper acetate or organic acid copper salt solution, water, and 31g of ammonia solution, mix the above aqueous solutions, and spray-dry the mixed solution in air at 180°C to prepare Cu(OH ) 2 Powder, Cu(OH) 2 CuO, Cu 2 O powder.

[0067] Preparation of ...

Embodiment 2

[0070] The preparation of the copper-silicon composite is the same as in Example 1, and the preparation of copper oxide is the same as in Example 1.

[0071] Preparation of copper-silicon composite pole piece: mix copper-silicon composite (0.3g), copper oxide (0.1g), and bonding reducing agent polyethylene glycol aqueous solution (2g) to prepare a slurry, and apply the slurry to Cu Prepare the pole piece on the foil current collector, dry the pole piece and use 10MPa / cm 2 pressure preload.

[0072] Electrode welding: place the above-mentioned pole piece in a nitrogen furnace, keep it at 500°C for 6 hours for welding, then reduce it with hydrogen at 300°C for 2 hours, and then heat it at 5MPa / cm 2 Under the final pressure, the pole pieces were compacted and cut into discs with a diameter of 14mm for assembling button batteries (lithium pieces as the counter electrode). For the test results of the button battery test, see figure 2 shown. Depend on figure 2 It can be seen ...

Embodiment 3

[0074] Preparation of copper-silicon composite active material: Copper acetate (31g) is dissolved in the mixed solution of absolute ethanol and deionized water as the copper source, weighs silicon (2.5g) and joins in the mixed solution of copper acetate, and finally An aqueous solution of polyacrylic acid (6 g) was added to the above mixed solution as a surfactant. The prepared mixed solution was spray-dried to prepare the composite material, and the spray-dried nitrogen atmosphere was used at a temperature of 160°C; then the composite material was kept at 300°C in a hydrogen atmosphere for 6 hours to undergo a reduction reaction to prepare a copper-silicon composite. Copper powder for preparing copper-silicon composite can be used as soldering agent at the same time.

[0075] Preparation of copper-silicon composite pole piece: Mix positive electrode material copper-silicon composite (0.8g), PAA aqueous solution (0.3g,) and deionized water (1g) to prepare a slurry, and apply t...

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Abstract

The invention relates to a preparation method for a negative plate, and provides a copper-silicon negative electrode and a preparation method therefor. A negative electrode active material contains silicon; and the negative electrode active material is welded on a current collector through metal. According to the copper-silicon negative electrode, the electrode active material is welded on the surface of the current collector through metal, so that the negative plate is endowed with excellent metal conductivity; the negative plate is directly welded through the metal and a silicon-copper composite material, so that the action force among the materials is high without causing a peel-off phenomenon of the active substance; the negative plate is prepared from the metal and the silicon-copper composite material, so that the prepared negative plate can be well compressed, the thickness of a pole piece is thinned, and the volume energy density of the battery is improved consequently.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and relates to a negative pole piece and a preparation method thereof, in particular to a copper-silicon negative pole and a preparation method thereof. Background technique [0002] At present, commercialized lithium-ion batteries are widely used in mobile phones, portable devices, public transportation equipment and other fields. The materials used in the positive electrode are mainly LiCoO 2 , LiNiO 2 , LiMn 2 o 4 、LiFePO 4 , NCM, NCA and other lithium-containing composite metal oxides, these materials have the advantages of high specific capacity, high working voltage, and long life. The negative electrodes corresponding to the above-mentioned positive electrode materials generally use graphite, lithium titanate Li 4 Ti 5 o 12 , silicon and other materials. [0003] The current conventional negative electrode sheet preparation method is to use active materials, binders, conductiv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/134H01M4/04H01M4/1395H01M10/0525
CPCY02E60/10
Inventor 王卫涛刘宇航周小平
Owner MICROVAST POWER SYST CO LTD
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