Preparation method for hollow carbon-coated nano-silicon composite graphite material

A composite graphite and composite material technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of inability to be used alone, fast capacity decay, poor stability of intercalation and delithiation, etc. Stable and reversible lithium intercalation and deintercalation, good cycle performance, and the effect of improving energy density

Pending Publication Date: 2018-07-27
OPTIMUM BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the stability of lithium intercalation and desorption of simple silicon is extremely poor, and it is easily broken and pulverized by stress during the process of intercalation and delithiation of lithium. With practical performance

Method used

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  • Preparation method for hollow carbon-coated nano-silicon composite graphite material
  • Preparation method for hollow carbon-coated nano-silicon composite graphite material
  • Preparation method for hollow carbon-coated nano-silicon composite graphite material

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preparation example Construction

[0020] The invention provides a method for preparing a hollow carbon-coated nano-silicon composite graphite material, comprising the following steps:

[0021] 1) Dissolve a certain amount of surfactant in absolute ethanol, add silicon nanoparticles at 35-45°C and stir for 1.5h; then heat to 70-85°C, add a certain amount of 2,4-dihydroxybenzoic acid and the catalyst, stirring at a constant temperature within the range of 70-85°C for 2 hours; then adding a certain amount of formaldehyde solution, and reacting for 30-36 hours to obtain a suspension, which is filtered, washed, and dried to obtain composite microspheres; wherein, the The surfactant is polyethylene glycol-polypropylene glycol-polyethylene glycol triblock copolymer; the catalyst is L-lysine.

[0022] 2) Dispersing the composite microspheres in step 1) in a mixed solution of absolute ethanol and deionized water, stirring and dispersing at a constant temperature of 75-85° C. for 3-4 hours, to obtain nano-silicon coated...

Embodiment 1

[0028] Dissolve 6-30g of surfactant (polyethylene glycol-polypropylene glycol-polyethylene glycol triblock copolymer) in 300-600ml of absolute ethanol, add 2-6g of silicon nanoparticles at 40°C and stir for 1.5h ; Then heat to 80°C, add 20~60g of 2,4-dihydroxybenzoic acid and 2~5g of L-lysine, stir at 80°C for 2h; then add 15~30ml of formaldehyde solution, react for 30h A khaki suspension is obtained, and after filtering, washing and drying, composite microspheres are obtained. The obtained composite microspheres were dispersed in a mixed solution of absolute ethanol and deionized water with a volume ratio of 3:1, and stirred and dispersed at a constant temperature of 80°C for 3.5 hours to obtain nano-silicon coated with carbon microspheres. Carbon microspheres coated nano-silicon in H 2 with N 2 Under the mixed atmosphere of 650 ° C constant temperature carbonization treatment for 1 h, the hollow carbon microsphere-coated nano-silicon particle composite material was obtaine...

Embodiment 2

[0031] Dissolve 6-30g of surfactant (polyethylene glycol-polypropylene glycol-polyethylene glycol triblock copolymer) in 300-600ml of absolute ethanol, add 2-6g of silicon nanoparticles at 45°C and stir for 1.5h ; Then heat to 85°C, add 20~60g of 2,4-dihydroxybenzoic acid and 2~5g of L-lysine, stir at 85°C for 2h; then add 15~30ml of formaldehyde solution, react for 32h A khaki suspension is obtained, and after filtering, washing and drying, composite microspheres are obtained. The obtained composite microspheres were dispersed in a mixed solution of absolute ethanol and deionized water with a volume ratio of 3:1, and stirred and dispersed at a constant temperature of 85°C for 3.5 hours to obtain nano-silicon coated with carbon microspheres. Carbon microspheres coated nano-silicon in H 2 with N 2 Carbonization treatment at 670°C for 1 hour under a mixed atmosphere of 670°C to obtain a hollow carbon microsphere-coated nano-silicon particle composite material.

[0032] The ho...

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Abstract

The invention discloses a preparation method for a hollow carbon-coated nano-silicon composite graphite material. The preparation method comprises the following steps: wrapping a lithium intercalationmaterial, i.e., nano-silicon, with hollow carbon spheres; and then carrying out compounding with highly-graphitized synthetic graphite so as to prepare the hollow carbon sphere-coated nano-silicon composite material. The prepared composite material is applied as an active material for a negative electrode of a lithium battery, has high lithium intercalation capacity, allows the lithium battery tohave good cycle performance and can realize stable reversible lithium intercalation and deintercalation, which enables the energy density of the lithium battery to be improved.

Description

【Technical field】 [0001] The invention relates to the technical field of negative electrode materials for lithium ion batteries, in particular to a method for preparing a hollow carbon-coated nano-silicon composite graphite material. 【Background technique】 [0002] With the development and popularization of the new energy automobile industry, the requirements for the actual driving range increase, and the energy density requirements for lithium-ion batteries are getting higher and higher. At present, artificial graphite is the mainstream commercial lithium battery anode material, which has the advantages of low cost, mature technology and stable performance. Ordinary artificial graphite anode materials have a theoretical gram capacity of 372mAh / g, and the capacity in practical applications is about 330mAh / g to 345mAh / g. However, the existing graphite anode materials are limited by the theoretical gram capacity of graphite intercalated lithium in terms of capacity improvement...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/366H01M4/386H01M4/62H01M4/625H01M10/0525Y02E60/10
Inventor 张国恒许辉饶睦敏李路伟李金林
Owner OPTIMUM BATTERY CO LTD
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