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Conducting agent, preparation method thereof and lithium ion battery containing conducting agent

A conductive agent, unsubstituted technology, applied in the field of lithium-ion battery materials, which can solve the problems of high price, large market share, and difficulty in dispersion.

Active Publication Date: 2016-09-28
JIANGSU CONTEMPORARY AMPEREX TECHNOLOGY LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Super P is characterized by small particle size and is a popular conductive agent for lithium-ion batteries, with a large market share; conductive graphite acts as a node of the conductive network in the battery to improve the conductivity of the electrode; the characteristics of vapor-phase grown carbon fibers and carbon nanotubes The particle size is small, the specific surface area is particularly large, and the conductivity is particularly good. The disadvantage is that the price is high and it is difficult to disperse

Method used

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  • Conducting agent, preparation method thereof and lithium ion battery containing conducting agent
  • Conducting agent, preparation method thereof and lithium ion battery containing conducting agent
  • Conducting agent, preparation method thereof and lithium ion battery containing conducting agent

Examples

Experimental program
Comparison scheme
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preparation example Construction

[0082] In order to achieve the second object of the present application, the preparation method of the conductive agent represented by formula III at least comprises the following steps:

[0083] Step 1): Preparation of Compound 3

[0084] Compound 1 and compound 2 are subjected to substitution reaction to obtain compound 3.

[0085] As an improvement of the preparation method of the conductive agent of the present application, the reaction temperature is 100 ° C ~ 120 ° C, the reaction time is 22 ~ 26 hours, the reaction process adds tris(dibenzylideneacetone) dipalladium as a catalyst, tris(o-methyl) phenyl) phosphorus as ligand. Compound 1: Compound 2: The molar ratio of tris(dibenzylideneacetone)dipalladium:tris(o-methylphenyl)phosphorus is 1.55-1.75:1.85-2.05:0.035-0.055:0.145-0.175. The reaction is carried out in an inert gas.

[0086]

[0087] Step 2): Preparation of Compound 4

[0088] Substitution reaction of compound 3 with N-bromosuccinimide gives compound 4....

Embodiment 1～3

[0107] The structural formulas of the conductive agents in Examples 1 to 3 are shown in Formula III, and the specific selection of the substituents is shown in Table 1:

[0108]

[0109]

[0110] Table 1

[0111] Example

R 11 , R 21 , R 31

R 12 , R 22 , R 32

R 13 , R 23 , R 33

R 14 , R 24 , R 34

R 15 , R 25 , R 35

Example 1

Hexyl

Hexyl

2-Ethylhexyl

2-Ethylhexyl

-F

Example 2

Isopropyl

Isopropyl

Hinkie

Hinkie

-F

Example 3

phenyl

phenyl

Methoxy

Methoxy

-F

[0112] Specifically, the preparation method of the conductive agent shown in Example 1 is:

[0113] Step 1): Preparation of Compound 3

[0114] N-2-ethylhexyl-5-fluoro-6'-bromoisoindigo (4820 mg, 8.2 mmol), 3,4'-dihexyl-(2,2'-dithiophene)-5-trimethyl Stannane (4940 mg, 9.8 mmol), tris(dibenzylideneacetone)dipalladium (190 mg, 0.2 mmol) and tris(o-methylphenyl)phosphorus (250 mg, ...

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PUM

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Abstract

The invention relates to a conducting agent. Particularly, the structural formula of the conducting agent contains a substituent represented by a formula I (shown in the specification). The invention further relates to a preparation method of the conducting agent and a lithium ion battery containing the conducting agent. According to the preferred technical scheme of the invention, the molecules of the conducting agent are of a three-arm star-shaped structure and form a conjugate big pi system, and electrons can be effectively transmitted in the conjugate system. The conducting agent and a carbon-phase conducting material are matched to be applied to a lithium ion battery, isolated active material particles and carbon-phase conducting material particles can be effectively crosslinked by virtue of a star-structured molecular chain to form a space conducting network, so that the rate capability of the battery is improved.

Description

technical field [0001] The present application relates to the field of lithium-ion battery materials, and in particular, to a conductive agent, a preparation method thereof, and a lithium-ion battery containing the conductive agent. Background technique [0002] At present, the positive active materials used in lithium-ion batteries are mostly transition metal oxides or transition metal phosphates, which are semiconductors or insulators with poor conductivity, so a conductive agent must be added to improve the conductivity. [0003] From the market point of view, conductive agents mainly include conductive carbon black (Super P), conductive graphite (KS-6), vapor grown carbon fiber (VGCF), carbon nanotube (CNT), etc. Super P is characterized by small particle size and is a popular conductive agent for lithium-ion batteries, with a large market share; conductive graphite acts as a node of the conductive network in the battery to improve the conductivity of the electrode; the ...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M10/0525
CPCH01M4/62H01M10/0525Y02E60/10
Inventor 余林峰蒋治亿许金梅
Owner JIANGSU CONTEMPORARY AMPEREX TECHNOLOGY LIMITED
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