High softening point bitumen used as lithium ion battery negative pole coating layer material and manufacture thereof

A technology of high softening point asphalt and lithium-ion batteries, which is applied in non-aqueous electrolyte battery electrodes, building insulation materials, active material electrodes, etc., can solve the problems of complex preparation methods, high requirements, cumbersome follow-up treatment, etc., and achieve simple process, The effect of high discharge capacity and easy industrialization

Active Publication Date: 2008-01-23
ZHANJIANG JUXIN NEW ENERGY
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  • Summary
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation method of the coating material used in the above method-high softening point pitch is relatively complicated and requires high requirements, and often requires cumbersome follow-up treatment. After coating, the graphite particles are easy to bond and cause coating in the subsequent crushing process The layer is peeled off and damaged, which affects the overall performance of the negative electrode material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Mix medium temperature coal tar pitch with 1% (weight) Si, at 250°C, N 2 Heat treatment under atmosphere protection for 48 hours, and pulverize the product to a size below 3 μm with a jet mill to obtain the high softening point asphalt coating material of the present invention. Recording its fixed carbon content is 83%, quinoline insoluble matter 17% (weight), toluene insoluble matter 83% (weight), softening point 280 ℃.

[0018] Among them, the above heat treatment equipment adopts circulating tunnel kiln, intermittent low temperature heat treatment furnace, high temperature oven and so on. During the heat treatment, a protective gas such as nitrogen, argon, helium, neon or carbon dioxide is filled, the gas flow rate is 1-10 liters / minute, and the final heat treatment temperature rise rate is 1-10° C. / minute. After heat treatment, cool down to room temperature, and use high-speed pulverizer, low-speed pulverizer, classifier to pulverize and classify respectively. The...

Embodiment 2

[0020] Mix medium temperature petroleum asphalt with 3% (weight) B 4 C mix, at 350°C, N 2 Heat treatment for 24 hours under the protection of the atmosphere, and pulverize the product to be less than 3 μm by using a jet mill to obtain the high softening point asphalt coating material of the present invention. It is measured that its fixed carbon content is 85%, quinoline insoluble matter 21% (weight), toluene insoluble matter 74 (weight) %, softening point 290 ℃.

Embodiment 3

[0022] Mix medium temperature petroleum asphalt with 10% (weight) H 3 PO 4 Mixed, at 500°C, CO 2 Heat treatment for 5 hours under the protection of the atmosphere, and pulverize the product to be less than 3 μm by using a jet mill to obtain the high softening point asphalt coating material of the present invention. Recording its fixed carbon content is 81%, quinoline insoluble matter 23% (weight), toluene insoluble matter 88% (weight), softening point 260 ℃.

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Abstract

The invention discloses an asphalt with high softening point for the clad material of the negative electrode of lithium ion battery, which is characterized in that the asphalt is the isotropic asphalt with content of fixed carbon more than 80 per cent, content of quinoline insolubles of 10 per cent to 30 per cent, content of toluene insolubles of 60 per cent to 90 per cent and softening point of 240 DEG C. to 300 DEG C.. The invention realizes the process solution of the clad material-asphalt with high softening point of the lithium ion battery prepared by cheap mid-temperature coal asphalt or petroleum asphalt and adopts the material as the lithium ion secondary battery modification graphite negative electrode materials, which has high discharge capacity, good cycle performance, lower production cost, simple process of the invention and easy industrialization.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a pitch with a high softening point used as a negative electrode coating material of a lithium ion battery and a preparation method thereof. Background technique [0002] Lithium-ion batteries are a new generation of secondary batteries after nickel-metal hydride batteries since the 1990s. Because of its advantages such as high working voltage, high energy density, long cycle life, small self-discharge, and no memory effect, it has become the preferred chemical power source for high-end electronic consumer products, and has penetrated into aerospace, military and other cutting-edge technology fields. With its ever-increasing demand, lithium-ion batteries are becoming the focus and focus of scientific and technological research and development in the new century. At present, the anode materials of commercial lithium-ion batteries are all carbon materials, mainly petrole...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L95/00C08K3/32H01M4/02C08K3/22H01M4/13
CPCY02E60/12Y02E60/10
Inventor 吴其修张万红
Owner ZHANJIANG JUXIN NEW ENERGY
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