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Composite material for positive electrode of lithium battery

A technology for composite materials and lithium batteries, applied in battery electrodes, positive electrodes, non-aqueous electrolyte battery electrodes, etc., can solve problems such as hindering long-distance conductive paths and making it difficult to fully utilize the potential of carbon nanotubes

Inactive Publication Date: 2014-04-16
KAO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, fibrous carbons such as carbon nanotubes are entangled with each other to form coils, so it is difficult to disassemble the fibrous carbons and mix them uniformly with the positive electrode active material in the mixing method described in Patent Document 1, and it is difficult to fully utilize the carbon nanotubes. tube potential
[0011] In addition, as disclosed in Patent Document 2, the method of mixing while mechanically applying a strong shear force using a centrifugal ball mill cuts the carbon nanofibers, so there is a problem that it will interfere with the characteristics of the carbon nanofibers. Long conductive paths created by high aspect ratio
[0012] In addition, in the production method of the positive electrode composite material described in Patent Document 3, it is difficult to uniformly mix the fibrous carbon and the positive electrode active material when preparing the slurry for spray drying, so as the conductive aid in this production method, agent, it is difficult to use fibrous carbon instead of toner

Method used

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  • Composite material for positive electrode of lithium battery
  • Composite material for positive electrode of lithium battery
  • Composite material for positive electrode of lithium battery

Examples

Experimental program
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Effect test

Embodiment 1

[0103] 0.375 parts by weight of a nonionic dispersant (Emulgen A-90 manufactured by Kao Corporation) having a phenyl group as a functional group was added and dissolved in 100 parts by weight of water. 0.375 parts by weight of carbon nanotubes having a fiber diameter of 20 nm, a fiber length of 5 μm, and an aspect ratio of 250 were added to the solution, and ultrasonically dispersed so that the average aggregate particle size of the carbon nanotubes was 3 μm. While irradiating the carbon nanotube dispersion liquid with ultrasonic waves, 0.15 parts by weight of an average aggregated particle size of 2 μm (primary particle size of 25 nm) and a DBP absorption capacity of 155 cm was added. 3 / 100g of carbon black, irradiated with ultrasonic waves for 1 minute, and then added 7.5 parts by weight of lithium manganate with an average aggregated particle size of 1.2 μm, and further dispersed by ultrasonic waves for 2 minutes. The obtained dispersion was spray-dried at a hot air temper...

Embodiment 2

[0105] 1.5 g of dispersant-containing particles spray-dried in the same manner as in Example 1 were heated in an electric furnace at 200° C. for 10 hours to decompose and vaporize the dispersant and remove it. The obtained composite material for positive electrode is shown in figure 2 , and its physical properties are shown in Table 1. The obtained composite material for positive electrode was confirmed by the method shown in (9) above, and as a result, it was found that it was a composite particle formed by holding the positive electrode active material particles by carbon nanotubes. More specifically, as figure 2 As shown, it has a form in which carbon nanotubes exist in the gaps between the positive electrode active material particles, and the carbon nanotubes enclose the positive electrode active material particles in a mesh shape.

Embodiment 3

[0107] Except that the non-ionic dispersant with phenyl functional groups is used in an amount of 0.15 parts by weight, and the carbon nanotubes are used in an amount of 0.15 parts by weight, the same method as in Example 1 is used to prepare a composite material for positive electrodes. The obtained composite material for positive electrode is shown in image 3 Among them, the physical properties are shown in Table 1, and the internal resistance at the time of battery production is shown in Table 2. The obtained composite material for positive electrode was confirmed by the method shown in (9) above, and as a result, it was found that it was a composite particle formed by holding the positive electrode active material particles by carbon nanotubes. More specifically, as image 3 As shown, it has a form in which carbon nanotubes exist in the gaps between the positive electrode active material particles, and the carbon nanotubes enclose the positive electrode active material pa...

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Abstract

The present invention provides a composite material for positive electrodes of lithium batteries, which provides a lithium battery having excellent high rate electrical discharge characteristics, has a sufficiently secured diffusion passage for Li, and has high conductivity, a process for producing the same, as well as a positive electrode and a battery using the composite material for positive electrodes of lithium batteries. The present invention relates to a composite material for positive electrodes of lithium batteries, comprising composite particles containing positive electrode active material particles and fibrous carbons, wherein the composite particles have a form in which the positive electrode active material particles are supported by the fibrous carbons.

Description

technical field [0001] The present invention relates to a composite material for a positive electrode of a lithium battery composed of composite particles containing positive electrode active material particles and fibrous carbon, a method for producing the same, and a positive electrode and a battery using the composite material for a positive electrode of a lithium battery. Background technique [0002] In recent years, against the background of rising prices of petroleum resources and the upsurge of the international global environmental protection movement, studies are being conducted to promote the adoption of electric vehicles, hybrid vehicles, and fuel cell vehicles. In their drive systems, batteries are indispensable as auxiliary power sources, and high output batteries that can cope with sudden start and sudden acceleration of automobiles are desired. In addition, from the viewpoint of weight load on the vehicle and increase in fuel consumption, batteries with high ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/62
CPCH01M2004/028H01M4/625H01M4/364H01M2004/021H01M4/622H01M4/139H01M4/13H01M4/02Y02E60/122Y02E60/10
Inventor 隐岐一雄泽井实北山博昭斋藤崇实三浦环渡边恭一
Owner KAO CORP
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