Composite conductive agent and dispersion method thereof as well as positive plate and lithium ion battery

A composite conductive agent and conductive agent technology, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as unsatisfactory conductive effects, achieve excellent safety performance, increase rate performance, and improve liquid absorption performance.

Active Publication Date: 2014-01-22
江西格林德能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a composite conductive agent and its dispersion method, a posi

Method used

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  • Composite conductive agent and dispersion method thereof as well as positive plate and lithium ion battery
  • Composite conductive agent and dispersion method thereof as well as positive plate and lithium ion battery
  • Composite conductive agent and dispersion method thereof as well as positive plate and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] The composite conductive agent used in this example is composed of carbon black with D50 at 20-60nm, submicron graphite particle conductive agent with D50 at 600nm, spherical conductive graphite KS-6 with D50 at 5 μm, and carbon nanotubes with 500nm-5 μm , and the percentages by weight of the composite conductive agent are: 40%, 15%, 15%, and 30%, respectively.

[0059] The composite conductive agent is effectively dispersed by nanometer ultra-fine dispersion technology in the preparation process of the positive electrode slurry. Specifically, it refers to the introduction of the polymer dispersant polyvinylpyrrolidone in the dispersion process of the composite conductive agent, and the high-viscosity dispersion mixer is used for high-speed dispersion. , and then under the strong mechanical shear force of the ultra-fine dispersion equipment, the aggregates such as fine powder clusters in the solution are further dispersed to obtain sufficiently fine powder particles, whi...

Embodiment 2

[0064] The nano-submicron three-dimensional network composite conductive agent used in this embodiment consists of acetylene black with D50 at 20-60nm, submicron graphite particle conductive agent with D50 at 400nm, spherical conductive graphite KS-6 with D50 at 3 μm and 500nm-6 μm The carbon nanofibers are composed of carbon nanofibers, and their weight percentages in the composite conductive agent are respectively: 30%, 20%, 20%, and 30%.

[0065] The formula and preparation method of the positive electrode slurry are the same as in Example 1, except that the composite conductive agent of this example is used as the conductive agent; the negative electrode sheet, separator, electrolyte and packaging shell are the same as in Example 1.

Embodiment 3

[0067] The nano-submicron three-dimensional network composite conductive agent used in this example consists of Super-P with a D50 of 20-60nm, a submicron (or called flake nano) graphite particle conductive agent with a D50 of 900nm, and a spherical graphite particle with a D50 of 7μm. The conductive graphite KS-6 is composed of carbon nanofibers of 500nm-4μm, and their weight percentages in the composite conductive agent are respectively: 35%, 30%, 10%, and 25%.

[0068] The formula and preparation method of the positive electrode slurry are the same as in Example 1, except that the composite conductive agent of this example is used as the conductive agent; the negative electrode sheet, separator, electrolyte and packaging shell are the same as in Example 1.

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Abstract

The invention discloses a composite conductive agent and a dispersion method thereof as well as a positive plate and a lithium ion battery. The particles of the components of the composite conductive agent are in graded distribution from nanoscale to micron order, and the composite conductive agent comprises the following components in percentage by weight: 30-40% of a nanoscale spherical carbon particle conductive agent, 15-30% of a sub micron order graphite particle conductive agent, 10-20% of micron order conductive graphite and 20-30% of a nanoscale linear conductive agent. According to the invention, a three-dimensional network conductive structure is formed in the positive plate by adding the composite conductive agent in the preparation process of the positive plate and effectively mixing the composite conductive agent with anode material particles in the lithium ion battery, so that the conductive performance of the anode material is greatly improved to further improve the development of gram specific capacity of active substances and improve the liquid absorption performance of the positive plate, thereby remarkably improving the rate capability, the circulating performance and the low temperature performance of the lithium ion battery, and further ensuring that the lithium ion battery has more excellent safety performance to some extent.

Description

technical field [0001] The invention relates to the technical field of energy materials, in particular to a composite conductive agent and a dispersion method thereof, a positive electrode sheet and a lithium ion battery. Background technique [0002] As a new type of green energy, lithium-ion batteries are widely used in portable electronic products that have developed rapidly in recent years because of their advantages such as high capacity, high voltage, small size and light weight, long cycle life, wide working range, good safety, and no memory effect. Applications such as 3C / 3G mobile phones, notebook computers, tablet computers, cameras, etc., electric vehicles, power supply systems for national defense and military equipment, and photovoltaic energy storage systems, energy storage peak-shifting power stations, uninterruptible power supplies, small and medium-sized energy storage systems, etc. The field has broad application prospects. [0003] In the face of the larg...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/131H01M10/0525
CPCH01M4/131H01M4/136H01M4/1391H01M4/1397H01M4/625H01M10/0525Y02E60/10
Inventor 刘小虹余兰李国敏李露郑小聪王敏
Owner 江西格林德能源有限公司
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