A kind of preparation method of composite conductive agent used in lithium ion battery

A technology of composite conductive agent and composite solvent, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of poor synergistic effect and single function, and achieve the effects of strong conductivity, improved cycle performance, and improved electrochemical performance

Active Publication Date: 2018-11-23
东莞市智库新能源技术有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the above problems, the present invention provides a method for preparing a composite conductive agent used in lithium-ion batteries. The preparation process of the composite conductive agent is simple and low in cost, and the prepared composite conductive agent can solve the problems existing in the use of lithium-ion batteries. Problems such as poor synergy and single function

Method used

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  • A kind of preparation method of composite conductive agent used in lithium ion battery
  • A kind of preparation method of composite conductive agent used in lithium ion battery

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Experimental program
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Effect test

Embodiment 1

[0028] 10 grams of aniline, 15 grams of phenylacetylene, and 30 grams of phenyllithium were added to 500 grams of chloroform and stirred evenly to prepare an organic composite solvent A. Add 15 grams of ammonium persulfate, 30 grams of hydrochloric acid, and 60 grams of acidified carbon nanotubes into 1000 grams of double distilled water and stir evenly to prepare an aqueous composite solvent. Move the water-based composite solvent into a jar, then slowly pour the organic composite solvent on the surface of the aqueous composite solvent, shake the jar under nitrogen for 10 minutes, and finally obtain a polymer at the water / oil interface. The material was taken out and washed with ethanol and double distilled water respectively to prepare a composite conductive agent.

Embodiment 2

[0030] Add 10 grams of aniline, 10 grams of phenylacetylene, and 10 grams of phenyllithium into 500 grams of ether and stir evenly to prepare organic composite solvent A. 10 grams of ammonium persulfate, 10 grams of hydrochloric acid, and 50 grams of acidified carbon nanotubes were added to 1000 grams of double distilled water and stirred evenly to prepare an aqueous composite solvent. Move the water-based composite solvent into a jar, then slowly pour the organic composite solvent on the surface of the aqueous composite solvent, shake the jar under nitrogen for 10 minutes, and finally obtain a polymer at the water / oil interface. The material was taken out and washed with ethanol and double distilled water respectively to prepare a composite conductive agent.

Embodiment 3

[0032] 10 grams of aniline, 20 grams of phenylacetylene, and 50 grams of phenyllithium were added to 500 grams of ether and stirred evenly to prepare an organic composite solvent A. 20 grams of ammonium persulfate, 50 grams of hydrochloric acid, and 100 grams of acidified carbon nanotubes were added to 1000 grams of double distilled water and stirred evenly to prepare an aqueous composite solvent. Move the water-based composite solvent into a jar, then slowly pour the organic composite solvent on the surface of the aqueous composite solvent, shake the jar under nitrogen for 10 minutes, and finally obtain a polymer at the water / oil interface. The material was taken out and washed with ethanol and double distilled water respectively to prepare a composite conductive agent.

[0033] figure 1 It is the scanning electron microscope SEM test figure of embodiment 1, the scanning electron microscope SEM test figure of embodiment 2-3 and figure 1 Similar, not otherwise given.

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Abstract

The invention relates to a preparation method of a composite conductive agent used in lithium ion batteries. The preparation method comprises an organic composite solvent preparation process, a water-based composite solvent preparation process and a composite conductive agent preparation process. Aniline, phenylacetylene, an organic lithium compound and an organic solvent are used in the organic composite solvent preparation process, ammonium persulfate, hydrochloric acid, acidized carbon nano tubes and a water-based solvent are used in the water-based composite solvent preparation process, and an organic composite solvent and a water-based composite solvent are used in the composite conductive agent preparation process. The organic lithium compound in the composite conductive agent can use lithium ions in the organic lithium compound to reduce lithium ions caused by SEI film loss in the charging and discharging process of the lithium ion batteries, and the cycle performance of the lithium ion batteries is improved, so that the composite conductive agent has the characteristics of high conductivity, large specific surface area and the like, and the liquid suction and liquid retaining capacity of the composite conductive agent is improved.

Description

technical field [0001] The invention belongs to the technical field of preparation of lithium ion battery materials, in particular to a preparation method of a composite conductive agent used in lithium ion batteries. Background technique [0002] Lithium iron phosphate cathode material is widely used in electric vehicles, energy storage and other fields due to its advantages of long cycle life, environmental friendliness, high energy density and low cost. Applications in the field of high-rate lithium-ion batteries. Methods to improve the rate performance of positive electrode materials include: reducing the particle size of the material, adding a certain proportion of conductive agent, or selecting a rate-type electrolyte, and adding conductive agent to the positive electrode material is currently the most commonly used method with the best effect. [0003] The current method of preparing conductive agents is mainly through the solid-phase mixing of nano-carbon series con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62
CPCH01M4/624Y02E60/10
Inventor 李志超
Owner 东莞市智库新能源技术有限公司
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