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Composite graphite negative electrode material with high energy density, and preparation method and application thereof

A technology of high energy density and composite graphite, which is applied in the field of high energy density composite graphite anode materials and its preparation, can solve the problems of complicated preparation steps, increased manufacturing costs, increased production costs, etc., and achieve good processing performance and high first-time efficiency , the effect of high first discharge

Inactive Publication Date: 2013-03-27
天津市贝特瑞新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, adding a conductive agent will increase its production cost, and steps such as roasting and impregnation make the preparation steps complicated, significantly prolonging the production cycle and increasing the manufacturing cost

Method used

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  • Composite graphite negative electrode material with high energy density, and preparation method and application thereof
  • Composite graphite negative electrode material with high energy density, and preparation method and application thereof
  • Composite graphite negative electrode material with high energy density, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Example 1 Preparation of composite graphite negative electrode material of the present invention

[0062] The preparation method of composite graphite negative electrode material of the present invention may further comprise the steps:

[0063] (1) Weigh 50Kg D 50 25μm petroleum coke and 50Kg D 50 It is natural graphite of 18 μm, which is placed in a mixer and mixed uniformly to obtain a composite graphite homogeneous mixture;

[0064] (2) Heat 50Kg of medium-temperature coal tar pitch to 100°C, then add the prepared composite graphite homogeneous mixture into medium-temperature coal tar pitch at 100°C, knead under normal pressure and 100°C until the kneading is uniform, and obtain kneading;

[0065] (3) Compress the kneaded mixture into a rectangular block with a size of 5cm×2cm×2cm under a pressure of 60Mpa, and obtain a density of 1.51 g / cm 3 moldings of

[0066] (4) Under the protection of nitrogen, heat up the rectangular block of t...

Embodiment 2

[0068] Example 2 Preparation of composite graphite negative electrode material of the present invention

[0069] The preparation method of composite graphite negative electrode material of the present invention may further comprise the steps:

[0070] (1) Weigh 100Kg D 50 20μm coal-based needle coke and 50Kg D 50 It is natural graphite of 15 μm, which is placed in a mixer and mixed uniformly to obtain a composite graphite homogeneous mixture;

[0071] (2) Heat 150Kg of medium-temperature coal tar pitch to 100°C, then add the prepared composite graphite homogenate into medium-temperature coal tar pitch at 100°C, knead under normal pressure and 100°C until the kneading is uniform, and obtain kneading;

[0072] (3) Compress the kneaded mixture into a rectangular block with a size of 5cm×2cm×2cm under the pressure of 80Mpa, and obtain a density of 1.56 g / cm 3 moldings of

[0073] (4) Under the protection of nitrogen, the rectangular block of the mo...

Embodiment 3

[0076] Example 3 Preparation of composite graphite negative electrode material of the present invention

[0077] The preparation method of composite graphite negative electrode material of the present invention may further comprise the steps:

[0078] (1) Weigh 200Kg D 50 28μm mesophase carbon microspheres and 50Kg D 50 It is natural graphite of 18 μm, which is placed in a mixer and mixed uniformly to obtain a composite graphite homogeneous mixture;

[0079] (2) Heat 125Kg high-temperature coal tar pitch to 120°C, then add the prepared composite graphite homogeneous mixture into high-temperature coal tar pitch at 120°C, knead under normal pressure and 120°C until the kneading is uniform, and obtain kneading;

[0080] (3) Compress the kneaded mixture into a rectangular block with a size of 5cm×2cm×2cm under a pressure of 90Mpa to obtain a density of 1.60 g / cm 3 moldings of

[0081] (4) Under the protection of nitrogen, the rectangular block of t...

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Abstract

The invention relates to a graphite composite material with high energy density. The composite graphite material comprises artificial graphite, natural graphite and a coating. A mass ratio of the artificial graphite to the natural graphite is 15:1-1:5; a mass ratio of the coating to the composite graphite is 1:5 to 5:1; the composite graphite comprises the artificial graphite and the natural graphite; the coating material is one selected from middle-temperature coal pitch, high temperature coal pitch, secondary coal pitch, petroleum pitch and coal tar, and a combination thereof. The composite graphite negative electrode material provided by the invention has advantages of high energy density, high discharge capacity, high first discharge (388mAh / g), high first efficiency (higher than 95%), high compactness (1.79g / cm<3>) and good processing performance, and meets requirements of high energy density of lithium ion battery material by portable electronic products.

Description

technical field [0001] The invention relates to the field of lithium-ion battery materials, in particular to a composite graphite negative electrode material with high energy density, a preparation method thereof and an application thereof. Background technique [0002] Since Japan's Sony Corporation successfully used carbon materials to prepare lithium-ion battery negative electrodes in 1991, research on carbon negative electrode materials for lithium-ion batteries has attracted much attention. In recent years, carbon anode materials for lithium-ion batteries have been widely used in various portable electronic products (such as laptops, mobile phones, cameras, etc.) and communication tools. The rapid development of these emerging fields requires features such as small size, high capacity, and high energy density. A new type of battery that is compact, lightweight, and environmentally friendly with excellent performance. [0003] As a new type of rechargeable battery, lith...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38
CPCY02E60/12Y02E60/10
Inventor 杨红强苗艳丽张俊平李花
Owner 天津市贝特瑞新能源科技有限公司
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