Composite graphite for lithium secondary battery and manufacturing method thereof

A lithium secondary battery and composite graphite technology, applied in secondary batteries, battery electrodes, circuits, etc., can solve problems such as peeling off of coated carbon materials, material deformation, and excessive specific surface area

Inactive Publication Date: 2009-04-22
PANASONIC ENERGY TAIWAN
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Problems solved by technology

At the same time, when a single liquid resin is used as the coating material, due to the excessive pores on the carbon mesh layer after heat treatment, and when the heat treatment is carried out at 800-1200 ° C, the amorphous carbon on the surface will be fused and agglomerated. The coated carbon material is prone to peeling off during the disintegration process, resulting in an excessively large specific surface area

Method used

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  • Composite graphite for lithium secondary battery and manufacturing method thereof
  • Composite graphite for lithium secondary battery and manufacturing method thereof
  • Composite graphite for lithium secondary battery and manufacturing method thereof

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[0024] In order to have a deeper understanding of the structure, use and characteristics of the present invention, it is clear,

[0025] For detailed knowledge and understanding, a preferred embodiment is cited, and the detailed description is as follows in conjunction with the drawings:

[0026] First see figure 1 As shown, the present invention is a composite graphite for lithium secondary batteries and a manufacturing method thereof, which includes the following manufacturing steps:

[0027] First select fixed carbon, fixed carbon ≥ 99.9%, and the interval between crystalline layers is d 002 High-purity spherical graphite ≤0.337nm is used as the substrate, preheated to a preset temperature with a heating kneader, put the coating material into the substrate, stir and mix, and then pack the above mixture into a graphite container. The mixture is sent into a hot-air constant-temperature circulation furnace to polymerize the mixture. The internal roasting conditions of the above-me...

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Abstract

The invention discloses composite graphite used for a lithium secondary battery and a production method thereof. The production method is as follows: spherical graphite is taken as a substrate, preheated by a heating mixing roll until the temperature of powder is between 55 and 85 DEG C, added with a clad material (a mixed liquid which consists of coal tar, maltha and liquid resin, and fully mixed; and the mixture is filled into a graphite container for macromolecular treatment, sent into a direct-fired cemented carbonized oven for carbonizing treatment, and subjected to screen stencil or airflow classification to obtain composite graphite powder. The production method simplifies the production procedure and saves the production cost; the product is taken as a cathode material of the lithium secondary battery, so that the lithium secondary battery has high initial charging and discharging efficiency and large discharge quantity.

Description

technical field [0001] The invention relates to a composite graphite for lithium secondary batteries and a manufacturing method thereof, in particular to a kind of simplification of the manufacturing process to save the production cost, obtain the negative electrode material of the lithium secondary battery, and the battery made by it can obtain higher discharge capacity and high discharge efficiency. Background technique [0002] With the rapid development and maturity of electronic technology, people have put forward new requirements for light-weight, high-energy, and adaptable power sources. The well-known lithium-ion battery has a large potential difference between the positive and negative materials, which can increase its power. Energy density achieves the characteristics of small size and high power, which can meet the needs of electronic products. [0003] The negative electrode materials of lithium-ion batteries are generally made of graphite. In terms of graphite,...

Claims

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Application Information

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IPC IPC(8): C01B31/04H01M4/58H01M4/02H01M10/40
CPCY02E60/122Y02E60/10
Inventor 藤上光治黄清维
Owner PANASONIC ENERGY TAIWAN
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