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A kind of conductive agent, its preparation method and lithium ion battery containing the conductive agent

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

Active Publication Date: 2019-04-05
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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  • A kind of conductive agent, its preparation method and lithium ion battery containing the conductive agent
  • A kind of conductive agent, its preparation method and lithium ion battery containing the conductive agent
  • A kind of conductive agent, its preparation method and lithium ion battery containing the conductive agent

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0082] In order to achieve the second objective of this application, the preparation method of the conductive agent shown in formula III includes at least the following steps:

[0083] Step 1): Preparation of compound 3

[0084] Compound 1 and compound 2 are subjected to a 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 to 120°C, the reaction time is 22 to 26 hours, and tris(dibenzylideneacetone)dipalladium is added as a catalyst during the reaction. Phenyl) phosphorus acts as a ligand. Compound 1: Compound 2: Tris (dibenzylideneacetone) dipalladium: tris (o-methylphenyl) phosphorus in a molar ratio of 1.55 to 1.75: 1.85 to 2.05: 0.035 to 0.055: 0.145 to 0.175. The reaction is carried out in an inert gas.

[0086]

[0087] Step 2): Preparation of compound 4

[0088] Compound 3 is subjected to substitution reaction with N-bromosuccinimide to obtain com...

Embodiment 1～3

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

Sinki

Sinki

-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] The N-2-ethylhexyl-5-fluoro-6'-bromoisoindigo (4820mg, 8.2mmol), 3,4'-dihexyl-(2,2'-dithiophene)-5-trimethyl Stannane (4940mg, 9.8mmol), tris(dibenzylideneacetone) dipalladium (190mg, 0.2mmol) and tris(o-methylphenyl)phosphorus (250mg, 0.83mmol) were added to a 500mL dry round bottom flask. The flask was repeatedly evacuated and filled with argon. After the atmosphere in th...

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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] This application relates to the field of lithium ion battery materials, and specifically to a conductive agent, a preparation method thereof, and a lithium ion battery containing the conductive agent. Background technique [0002] Currently, most of the cathode active materials used in lithium-ion batteries are transition metal oxides or transition metal phosphates. They are all semiconductors or insulators and have poor conductivity. Therefore, a conductive agent must be added to improve 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) and so on. Super P is characterized by its small particle size and is a popular conductive agent for lithium-ion batteries, with a large market share; conductive graphite acts as a node in the conductive network in the battery to improve the conductivity of the electrode; c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D409/14
CPCH01M4/62H01M10/0525Y02E60/10
Inventor 余林峰蒋治亿许金梅
Owner JIANGSU CONTEMPORARY AMPEREX TECHNOLOGY LIMITED
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