Nanometer silicon/graphene lithium ion battery cathode material and preparation method thereof

A lithium-ion battery and negative electrode material technology, which is applied in battery electrodes, circuits, electrical components, etc., can solve the problems of inability to give full play to graphene performance, uneven mixing of mechanical scales, and unsuitability for industrial development. The effect of improved cycle performance and stable cycle performance

Active Publication Date: 2013-11-20
湖北高地石墨烯科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the main combination method is always on the mechanical scale, mainly using the ball milling method to combine graphene and nano-silicon. Although it can achieve a certain effect, due to the uneven mixing of the mechanical scale, the performance of graphene cannot be improved. fully use
However, the heat treatment method that can achieve molecular scale combination has high energy consumption, and the COD chemical vapor deposition method is expensive, which is not suitable for industrial development.

Method used

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  • Nanometer silicon/graphene lithium ion battery cathode material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0038] Under the protection of argon, 1% by mass of lithium metal and 1% of biphenyl were dissolved in 1 kg of ethylene glycol dimethyl ether, and magnetically stirred to dissolve. After dissolution, the solution was dark green. Then, silicon tetrachloride with a mass ratio of 5% was added dropwise to the solution, and the dropwise addition was completed within 1 hour. At the same time, magnetic stirring was added to maintain 100 rpm, and the stirring was stopped after 1 hour.

[0039] Using water as a dispersant, configure a 0.5 g / L graphene suspension, add 60% nitric acid with a volume ratio of 1:2, and then ultrasonically treat it for 0.5 h. After the treatment, the obtained solution was repeatedly centrifuged and washed until pH=7. After vacuum drying, ultrasonic treatment was performed for 0.5 h again to dissolve it in cyclohexanol to form a 0.1 g / L graphene oxide gel-like solution.

[0040] Stir the nano-silicon suspension at a speed of 200 rpm, and during the stirring ...

Embodiment 2

[0042] Under the protection of argon, 3% by mass of lithium metal and 5% of 4,4'-dimethoxybiphenyl were dissolved in 1kg of tripropylamine, and magnetically stirred to dissolve. After dissolution, the solution was close to dark blue. Then, silicon tetrachloride with a mass ratio of 20% was added dropwise to the solution, and the dropwise addition was completed within 3 hours. At the same time, magnetic stirring was added to maintain 150 rpm, and the stirring was stopped after 1 hour.

[0043] Using water as a dispersant, configure a 0.5g / L graphite oxide aqueous solution, add 60% nitric acid with a volume ratio of 1:5, and use ultrasonic treatment for 0.5h. After the treatment, the obtained solution was repeatedly centrifuged and washed until pH=7. After vacuum drying, ultrasonic treatment was performed for 3 h again, and it was dissolved in ethanol to form a 5 g / L graphene oxide colloidal solution.

[0044] Stir the nano-silicon suspension at a speed of 150 rpm, and during t...

Embodiment 3

[0046] Under the protection of argon, dissolve 5% lithium metal and 5% anthracene in 1 kg of morpholine by mass percentage, stir and dissolve with a magnetic force, and the dissolved solution is close to metallic black. Then, silicon tetrachloride with a mass ratio of 20% was added dropwise to the solution, and the dropwise addition was completed within 3 hours. At the same time, magnetic stirring was added to maintain 150 rpm, and the stirring was stopped after 1 hour.

[0047] Using water as a dispersant, configure a 0.5 g / L graphene suspension, add 60% nitric acid with a volume ratio of 1:10, and then use 60 Hz ultrasonic treatment for 0.5 h. After the treatment, the obtained solution was repeatedly centrifuged and washed until pH=7. After vacuum drying, ultrasonic treatment was performed for 3 h again to dissolve it in ethylene glycol and configure a 1 g / L graphene oxide colloidal solution.

[0048] Stir the nano-silicon suspension at a speed of 200 rpm, and during the st...

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Abstract

The invention relates to a nanometer silicon/graphene lithium ion battery cathode material and a preparation method thereof. The cathode material comprises nanometer silicon and graphene, wherein the granularity of nanometer silicon granules is 10-100nm, and the mass ratio of nanometer silicon to graphene is 1:(5-10). The preparation method of the nanometer silicon/graphene lithium ion battery cathode material comprises the following steps of: preparing an electron solution; reducing a silicon tetrachloride liquid phase into nanometer silicon; preparing a graphene oxide glue sample solution; loading the graphene oxide glue sample solution on nanometer silicon; and drying and sintering the semi-finished product of the composite electrode material. According to the preparation method, after the nanometer silicon granules the granularity of which can be controlled are obtained through a liquid phase reducing method; in a mode that a glue body is separated out through replacing a solvent graphene is reduced and a glue layer is formed at the same time, and moreover the glue layer is adsorbed on an existing nanometer silicon glue nucleus; the obtained nanometer silicon has a better size and a better structure, can combine graphene and nanometer silicon efficiently in the term of molecule size; the obtained silicon carbon material has stable circulation performance and excellent electric conducting performance.

Description

technical field [0001] The invention belongs to the field of electrochemistry and new energy materials, and in particular relates to a nano-silicon / graphene lithium-ion battery negative electrode material and a preparation method thereof. Background technique [0002] Since the first commercialized lithium-ion battery products were launched by Sony Corporation of Japan in 1991, lithium-ion batteries have been developed for more than 20 years. Lithium-ion batteries have a unique charging and discharging mechanism of inserting / extracting lithium ions, so compared with similar battery products, it has the advantages of large specific capacity, high working voltage, high safety, and low environmental pollution. The development of negative electrode materials as the main body of lithium-ion battery storage has become a key point to improve the total specific capacity, charge-discharge and cycle performance of lithium-ion batteries. [0003] In the early days, the anode materials...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/583
CPCY02E60/12H01M4/364H01M4/366H01M4/386H01M4/587Y02E60/10
Inventor 张麟德张明东
Owner 湖北高地石墨烯科技有限公司
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