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Preparation method of lithium ion battery carbon anode material with graphene-like structure

A technology of lithium ion battery and carbon negative electrode material, which is applied to battery electrodes, structural parts, circuits, etc., can solve the problems of poor high-rate discharge performance, easy safety, poor compatibility, etc., and achieves improved cycle performance, low cost, The effect of low carbonization temperature

Active Publication Date: 2011-08-31
SHENZHEN EIGEN EQUATION GRAPHENE TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a method for preparing a novel graphene-like structure of a lithium-ion battery carbon negative electrode material, aiming to solve the problem that the carbon negative electrode material prepared in the prior art exists incompatible with the electrolyte. Poor compatibility, large irreversible capacity loss, poor high-rate discharge performance, and potential safety hazards at high temperatures

Method used

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  • Preparation method of lithium ion battery carbon anode material with graphene-like structure
  • Preparation method of lithium ion battery carbon anode material with graphene-like structure
  • Preparation method of lithium ion battery carbon anode material with graphene-like structure

Examples

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Embodiment 1

[0053] Stir 20g of 10% LPAN (molecular weight 1600) solution (mass percentage) at 120°C for 20 hours to form a microcyclized LPAN solution, heat-treat the microcyclized LPAN solution at 200~300°C for 10 hours to form a Thermally oxidized polyacrylonitrile oligomer (OPAN) solid with trapezoidal structure was ball-milled with a planetary ball mill at a ball-to-material ratio of 15:1, 400 rad / min for 8 h, and after discharge, sieved and dried at room temperature. Under the protection of argon, calcined at 600°C for 4 h, and carbonized to obtain an amorphous carbon anode material for lithium-ion batteries, whose structure is as follows: figure 1 As shown, it is amorphous carbon. Active material: acetylene black: adhesive is equal to the ratio (mass percentage) of 85:5:10 to make an electrode sheet, with lithium sheet as the positive electrode, Cellgard 2300 porous membrane as the separator, and 1mol??L -1 The mixed solution of LiPF6 / EC+DMC (volume ratio 1:1) was used as the elect...

Embodiment 2

[0055] Stir 20g of 10% LPAN (molecular weight 1600) solution (mass percentage) at 120°C for 20 hours to form a microcyclized LPAN solution, heat-treat the microcyclized LPAN solution at 200~300°C for 10 hours to form a Thermally oxidized polyacrylonitrile oligomer (OPAN) solid with trapezoidal structure was ball-milled with a planetary ball mill at a ball-to-material ratio of 15:1, 400 rad / min for 8 h, and after discharge, sieved and dried at room temperature. Under the protection of argon, calcined at 900 °C for 4 h, and carbonized to obtain an amorphous lithium-ion battery carbon anode material, whose structure is as follows: figure 2 As shown, it is amorphous carbon. Active material: acetylene black: adhesive is equal to the ratio (mass percentage) of 85:5:10 to make an electrode sheet, with lithium sheet as the positive electrode, Cellgard 2300 porous membrane as the separator, and 1mol??L -1 The mixed solution of LiPF6 / EC+DMC (volume ratio 1:1) was used as the electroly...

Embodiment 3

[0057] Stir 20g of 10% LPAN (molecular weight 1600) solution (mass percentage) at 120°C for 20 hours to form a microcyclized LPAN solution, heat-treat the microcyclized LPAN solution at 200~300°C for 16 hours to form a Thermally oxidized polyacrylonitrile oligomer (OPAN) solid with trapezoidal structure was ball-milled with a planetary ball mill at a ball-to-material ratio of 15:1, 400 rad / min for 8 h, and after discharge, sieved and dried at room temperature. Under the protection of argon, calcined at 1100°C for 4 h, and carbonized to obtain carbon anode materials for lithium ion batteries with various carbon structures (graphene-like structure, amorphous structure and carbon nanotubes). image 3 and Figure 4 As shown, there are both amorphous carbon structures and carbon nanotubes. The Raman spectrum of the carbon nanotubes in the resulting product is as Figure 7 As shown, there are both D peaks of amorphous carbon and G peaks and G' peaks of graphitic carbon in the prod...

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Abstract

The invention discloses a preparation method of a lithium ion battery carbon anode material with a graphene-like structure, which has the advantages of simple equipment and process, low required carbonizing temperature, low cost, high yield, good performance and the like, and has a wide application prospect. A graphene-like, amorphous carbon and carbon nano tube composite structure carbon material and the lithium ion battery carbon anode material modified by doping various elements, obtained by adopting the method, have high conductivity and specific volume; cycle performance can be greatly improved; and newer and better performances are obtained by adopting a special composite structure of the lithium ion battery carbon anode material.

Description

technical field [0001] The invention relates to the field of chemical batteries, in particular to a preparation method of a lithium-ion battery carbon negative electrode material with a graphene-like structure. Background technique [0002] Lithium-ion battery is a new generation of green high-energy battery. It has the advantages of light weight, high volume specific energy, high working voltage, and no environmental pollution. It is a modern communication, IT and portable electronic products (such as mobile phones, notebook computers, cameras, etc.) The ideal chemical power source is also the preferred power source for electric vehicles in the future, with broad application prospects and huge economic benefits. [0003] Anode materials are one of the key materials of lithium-ion batteries, and carbonaceous materials are the first materials that people began to study and apply to the anode of lithium-ion batteries, and they are still widely concerned. Carbonaceous material...

Claims

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Application Information

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IPC IPC(8): H01M4/1393
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 刘剑洪徐坚吴双泉张黔玲何传新朱才镇
Owner SHENZHEN EIGEN EQUATION GRAPHENE TECH CO LTD
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