Lithium ion battery cathode material and preparation method thereof as well as lithium ion battery

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problem of poor cycle performance, insufficient cycle performance of silicon-carbon composite materials, and poor contact between nano-silicon and carbon nanotubes Close and other problems, to achieve the effect of improving conductivity, good cycle performance, and close contact

Active Publication Date: 2013-10-09
宁波富理电池材料科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The silicon-carbon composite material obtained by the above method can improve the shortcoming of existing silicon-carbon anode materials with poor cycle performance, but the contact between nano-silicon and carbon nanotubes is not very close, so that the cycle performance of the obtained silicon-carbon composite material remains the same. not able to meet the needs

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  • Lithium ion battery cathode material and preparation method thereof as well as lithium ion battery
  • Lithium ion battery cathode material and preparation method thereof as well as lithium ion battery
  • Lithium ion battery cathode material and preparation method thereof as well as lithium ion battery

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preparation example Construction

[0034] The invention provides a kind of preparation method of lithium ion battery negative electrode material, comprises the following steps:

[0035] a) performing amination treatment on graphene oxide to obtain aminated graphene oxide;

[0036] b) mixing the aminated graphene oxide obtained in step a) with nano-silicon particles, gelatin and a crosslinking agent in water, and reacting the obtained mixed solution to obtain an intermediate product;

[0037] c) subjecting the intermediate product obtained in step b) to a hydrothermal reaction to obtain a hydrothermal reaction product;

[0038] d) calcining the hydrothermal reaction product obtained in the step c) in an inert atmosphere to obtain a lithium ion battery negative electrode material.

[0039] In the present invention, firstly, the graphene oxide is aminated to obtain the aminated graphene oxide. The present invention does not have special limitation to the source of described graphene oxide, adopts the technical s...

Embodiment 1

[0056] Graphene oxide was prepared by the Hummers Brodie method;

[0057] 200mg of graphite oxide was added to 200mL of dimethylformamide, ultrasonically treated for 2.5h to obtain a graphene oxide suspension, then 30g of triethylenetetramine and 5g of dicyclohexylcarbimide were added thereto, and the resulting mixed solution was After ultrasonication for 5 minutes, react at 120°C for 48 hours, then add 60 mL of absolute ethanol to it, and let it stand overnight; remove the upper clear layer, filter the lower precipitate with a polytetrafluoroethylene membrane, wash with ethanol and deionized water, and remove the obtained solid in Dry at 70°C to obtain triethylenetetramine-modified graphene oxide;

[0058] Mix 250g of triethylenetetramine-modified graphene aqueous solution with a mass concentration of 0.1%, 5g of nano-silicon particles with a particle size of about 10nm, 2.5g of gelatin and 0.5g of formaldehyde, and react at 40°C for 12h to obtain an intermediate product;

...

Embodiment 2

[0066]Graphene oxide was prepared by the Standenmaier method;

[0067] Add 200mg of graphite oxide to 200mL of dimethylformamide, sonicate for 2.5h to obtain a graphene oxide suspension, then add 30g of ethylenediamine and 5g of dicyclohexylcarbimide to it, and ultrasonicate the resulting mixed solution After 5 minutes, react at 120°C for 48 hours, then add 60 mL of absolute ethanol to it, and let it stand overnight; remove the upper clear layer, filter the lower precipitate with a polytetrafluoroethylene membrane, wash with ethanol and deionized water, and remove the obtained solid at 70 Drying at ℃ to obtain ethylenediamine-modified graphene oxide;

[0068] Mix 100g of an aqueous solution of ethylenediamine-modified graphene oxide with a mass concentration of 2.5%, 10g of nano-silicon particles with a particle size of about 400nm, 5g of gelatin and 5g of acetaldehyde, and react at 50°C for 10h to obtain an intermediate product;

[0069] The intermediate product was hydrothe...

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Abstract

The invention provides a lithium ion battery cathode material, comprising graphene, nanometer silicon particles distributed in a graphene lamellar structure, and net-shaped carbon materials distributed between the graphene lamellar structure and the nanometer silicon particles. According to the invention, the graphene has a good lamellar structure, nanometer silicon particles are distributed in the graphene lamellar structure, and net-shaped carbon materials are distributed between the graphene lamellar layer and the nanometer silicon particles. According to the lithium ion battery cathode material provided by the invention, carbon materials between the graphene lamellar layer and the network structure are in tight contact with the nanometer silicon particles, thereby improving conductivity of the cathode material, and at the same time, effectively buffering enormous volume change of silicon particles, thus the lithium ion battery cathode material has good cycle performance.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery negative electrode material, a preparation method thereof and a lithium ion battery. Background technique [0002] As a new type of carbon material discovered in recent years, carbon nanotubes have a tube diameter of only nanoscale dimensions, and the intersecting gaps between tubes are also only nanoscale dimensions. The special microstructure of carbon nanotubes provides a large number of intercalation space positions for lithium ions, which is conducive to improving the charge and discharge capacity and current density of lithium ion batteries. Therefore, more and more researches in the prior art are dedicated to the development of carbon nanotube-doped lithium-ion battery anode materials with excellent performance. [0003] Among the many alternative anode materials, silicon has attracted much attention because of its huge lithium storage ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M4/133H01M10/0525
CPCY02E60/10
Inventor 裴晓英李志虎夏永高刘兆平
Owner 宁波富理电池材料科技有限公司
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