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Lithium ion battery cathode material and preparation method thereof

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve problems affecting the energy density of lithium-ion batteries, affecting the process of lithium-ion batteries, and increasing the cost of negative electrode materials, so as to reduce energy consumption, The effect of product cost reduction and raw material cost reduction

Active Publication Date: 2012-11-28
BTR NEW MATERIAL GRP CO LTD
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Problems solved by technology

[0002] The method of preparing lithium-ion battery carbon negative electrode materials in the prior art is to use high-purity spherical graphite as a raw material, its carbon content is as high as 99.9%, and its shape is close to spherical. The complex preparation process is used to process graphite, including multi-phase coating, doping etc., the product yield is low, less than 50%, these methods inevitably increase the cost of negative electrode materials, and affect the development process of lithium-ion batteries to power batteries
In addition, existing products and related preparation methods cannot overcome the shortcomings of low specific capacity and low compaction density of negative electrode materials, which affects the further improvement of the energy density of lithium-ion batteries.

Method used

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  • Lithium ion battery cathode material and preparation method thereof
  • Lithium ion battery cathode material and preparation method thereof
  • Lithium ion battery cathode material and preparation method thereof

Examples

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preparation example Construction

[0027] The preparation method of lithium ion battery negative electrode material of the present invention comprises the following steps:

[0028] 1. Mixing, spherical, massive and / or flaky natural graphite powder with a spherical shape and a long-to-short axis ratio of 1.0 to 4.5, and non-graphite carbon material emulsified pitch that accounts for 10 to 50% of the mass of natural graphite powder, Accounting for 0.1-0.5% of the mass of natural graphite powder, high-molecular organic matter is used in the GS-300 high-speed mixer of Wuxi Xinguang Powder Processing Technology Co., Ltd., at a speed of 600-2100r / min, and a stirring time of 10-180min. Mix to obtain a suspension liquid mixture with a solid content of 10-70 wt%. The liquid is the sum of the mass of emulsified bitumen and water.

[0029] The natural graphite powder is any one or more of natural crystalline graphite, natural aphanitic graphite and natural crystalline vein graphite with a carbon content of 80-92% and a p...

Embodiment 1

[0046] The process parameters of Examples 1-6 are shown in Table 1. Such as figure 1 As shown, in Example 1, the spherical, massive and / or flaky irregular natural graphite with a spherical shape and a long-to-short axis ratio of 1.0 to 4.5 was modified by emulsified pitch to obtain a uniform coating layer on the surface.

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Abstract

The invention discloses a lithium ion battery cathode material and a preparation method thereof, which lower the cost of the lithium ion battery cathode material and improve the high-energy density thereof. The lithium ion battery cathode material takes more than one of natural crystalline graphite, natural cryptocrystalline graphite and natural crystalline vein graphite as matrixes, a non-graphitic carbon material is coated outside the matrixes, and the coated particles are compounded with a conductive material. The preparation method of the lithium ion battery cathode material comprises thefollowing steps of mixing and drying a liquid phase, carbonizing, carrying out high-temperature treatment and compounding. Compared with the prior art, the graphite with lower carbon content is takenas a raw material to greatly reduce the raw material cost; by adopting a hot air drying mode, the preparation process is simplified and a coating layer is more solid and compact; and by adopting lower carburizing temperature and the temperature for high-temperature heat treatment, energy consumption is reduced, and product cost is further lowered.

Description

technical field [0001] The invention relates to a battery negative electrode material and a preparation method thereof, in particular to a lithium ion battery carbon negative electrode material and a preparation method thereof. Background technique [0002] The method of preparing lithium-ion battery carbon negative electrode materials in the prior art is to use high-purity spherical graphite as a raw material, its carbon content is as high as 99.9%, and its shape is close to spherical. The complex preparation process is used to process graphite, including multi-phase coating, doping etc., the product yield is lower, below 50%, these methods inevitably make the cost of negative electrode material increase, have influenced the process that lithium-ion battery develops to power battery. In addition, existing products and related preparation methods cannot overcome the shortcomings of low specific capacity and low compaction density of negative electrode materials, which affect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/133H01M4/1393
CPCY02E60/122Y02E60/10
Inventor 岳敏闫慧青邓明华贺雪琴
Owner BTR NEW MATERIAL GRP CO LTD
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