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Preparation method of coated graphene-silicon lithium ion battery negative electrode material

A lithium-ion battery and negative electrode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of silicon deintercalation lithium structure collapse, graphite theoretical capacity is low, etc., to achieve the effect of uniform distribution

Active Publication Date: 2018-04-24
ANHUI ZHENGXIBIAOWANG NEW ENERGY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the technical problems of the low theoretical capacity of graphite and the collapse of the structure caused by silicon deintercalation of lithium in the prior art, the purpose of the present invention is to provide a method for preparing a coated graphene-silicon lithium-ion battery negative electrode material

Method used

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  • Preparation method of coated graphene-silicon lithium ion battery negative electrode material

Examples

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Embodiment 1

[0013] First, disperse graphene oxide and maleate with a mass ratio of 1:1 into water, stir at 70°C for 2 hours to obtain a dispersion, then spray dry at 150°C to make it into a powder, and treat it at 220°C for 5 hours , and then treated at 350°C for 5h, 450°C for 5h, and then at 750°C for 5h to obtain spherical graphene microspheres; after mixing the silicon-containing slurry with spherical graphene microspheres, evaporate the solvent and mix with high-temperature asphalt After high-speed mixing according to the mass ratio of 1:1, stir and then heat and pyrolyze, carbonize in an inert atmosphere, the carbonization temperature is 1000 °C, the holding time is 10 hours, and then graphitize, the graphitization temperature is 3000 °C, and the holding time is After 12 hours, the coated graphene-silicon lithium ion battery negative electrode material was obtained.

Embodiment 2

[0015] First, disperse graphene oxide and maleate with a mass ratio of 1.5:1 into water, stir at 80°C for 2 hours to obtain a dispersion, then spray dry at 180°C to make it into a powder, and treat it at 240°C for 5 hours , and then treated at 320°C for 5h, 480°C for 5h, and then at 780°C for 5h to obtain spherical graphene microspheres; after mixing the silicon-containing slurry with spherical graphene microspheres, evaporate the solvent and mix with high-temperature asphalt After high-speed mixing at a mass ratio of 1.5:1, stirring and then heating and pyrolysis, carbonization under an inert atmosphere, the carbonization temperature is 1100°C, the holding time is 12 hours, and then graphitization is carried out, the graphitization temperature is 2900°C, and the holding time is After 12 hours, the coated graphene-silicon lithium ion battery negative electrode material was obtained.

Embodiment 3

[0017] First, disperse graphene oxide and maleate with a mass ratio of 2:1 into water, stir at 90°C for 2 hours to obtain a dispersion, then spray dry at 200°C to make it into a powder, and treat it at 220°C for 5 hours , and then treated at 350°C for 5h, 450-500°C for 5h, and then at 800°C for 5h to obtain spherical graphene microspheres; after mixing the silicon-containing slurry with spherical graphene microspheres, evaporate the solvent and mix with After the high-temperature asphalt is mixed at a high speed at a mass ratio of 2:1, it is stirred and then heated and pyrolyzed, and then carbonized in an inert atmosphere. The carbonization temperature is 1200°C, and the holding time is 12 hours. The time is 10 hours, and the negative electrode material of the coated graphene-silicon lithium ion battery is obtained.

[0018] Take the material prepared in Examples 1-3 as the negative electrode material, make slurry with binder (LA132), conductive agent (Super-P) and dispersant ...

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Abstract

The invention relates to a preparation method of a coated graphene-silicon lithium ion battery negative electrode material. The preparation method of the coated graphene-silicon lithium ion battery negative electrode material is characterized by comprising the following steps: dispersing graphene oxide and maleate in water according to the mass ratio of 1-2: 1, dispersing, spraying and drying so that the mixture becomes powder, and carrying out high-temperature heat treatment to obtain spherical graphene microspheres; after uniformly mixing silicon-containing slurry with the spherical graphenemicrospheres, evaporating out a solvent and mixing with high-temperature asphalt at high temperature according to the mass ratio of 1-2: 1, stirring and then heating and pyrolyzing, carrying out high-temperature heat treatment in an inert atmosphere, and carrying out graphitization to obtain the coated graphene-silicon lithium ion battery negative electrode material. The preparation method of thecoated graphene-silicon lithium ion battery negative electrode material has the beneficial effects that the spherical graphene microspheres are dispersed highly, maleate, silicon and carbon are distributed uniformly, first discharge capacity can reach 860 or above, initial coulomb efficiency can reach 90% or above, charging and discharging are carried out under 0.1 C, and the capacity retention ratio is 82% or above after circulating for 500 times.

Description

technical field [0001] The invention belongs to the technical field of preparation of negative electrode materials of lithium ion batteries, and in particular relates to a preparation method of coated graphene-silicon lithium ion battery negative electrode materials. Background technique [0002] With the demand for production and the improvement of environmental protection awareness, new energy has become the focus of development in various countries. Among them, the development of lithium-ion batteries is particularly rapid, and its applications involve 3C products, power devices, energy storage equipment and other fields. [0003] At present, the anode material of commercial lithium-ion batteries is mainly graphite, but the theoretical capacity is only 372mAh / g, which has gradually failed to meet the market demand for high energy density. [0004] The theoretical capacity of silicon materials can reach 4200mAh / g, which is an order of magnitude higher than the current comm...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/62H01M4/625H01M10/0525Y02E60/10
Inventor 沈晨
Owner ANHUI ZHENGXIBIAOWANG NEW ENERGY CO LTD