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Carbon material for negative electrode of lithium secondary battery, method for producing the same, negative electrode of lithium secondary battery and lithium secondary battery

A technology for lithium secondary batteries and negative electrodes, applied in the fields of carbon materials for negative electrodes of lithium secondary batteries and their manufacture, negative electrodes of lithium secondary batteries, and lithium secondary batteries, capable of solving problems such as negative electrode damage and suppressing the reduction of electrical conductivity , excellent charge-discharge cycle characteristics, and the effect of simple manufacturing process

Inactive Publication Date: 2011-04-13
SUMITOMO BAKELITE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, as the charge-discharge cycle is repeated, the volume of the negative electrode material changes, and as a result, it is known that the negative electrode material is micronized, leading to damage to the negative electrode.

Method used

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  • Carbon material for negative electrode of lithium secondary battery, method for producing the same, negative electrode of lithium secondary battery and lithium secondary battery
  • Carbon material for negative electrode of lithium secondary battery, method for producing the same, negative electrode of lithium secondary battery and lithium secondary battery
  • Carbon material for negative electrode of lithium secondary battery, method for producing the same, negative electrode of lithium secondary battery and lithium secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] 135 parts by mass of a novolak-type phenolic resin (PR-50237 manufactured by Sumitomo Bakelite Co., Ltd.) and 25 parts by mass of hexamethylenetetramine (manufactured by Mitsubishi Gas Chemical Co., Ltd.) as carbon precursors were mixed with 86 mL of ethanol, An ethanol solution in which the total amount of the novolak-type phenolic resin and hexamethylenetetramine accounts for 70% by mass of the whole amount was obtained.

[0057] To 228 parts by mass of this ethanol solution, 100 parts by mass of silicon monoxide powder (average particle diameter 6 μm), 0.0043 parts by mass of iron nitrate, 0.00076 parts by mass of copper nitrate, 0.00104 parts by mass of molybdenum nitrate and 0.0011 parts by mass of aluminum powder (above, Kanto Chemical Co., Ltd.) was mixed for 3 minutes at room temperature with a high-speed mixer (homodisper manufactured by Primix Co., Ltd.) at a rotation speed of 3000 rpm to obtain 325 g of a compounded resin.

[0058] 300 g of the above blended ...

Embodiment 2

[0062] The procedure of Example 1 was repeated, but the holding time of the pulverized compound resin in the carbonization step at 1100° C. was changed from 6 hours to 1 hour.

[0063] Observation of the obtained composite carbon material by a scanning electron microscope, the result (electron micrograph) is shown in image 3 middle. from image 3 It can be seen that carbon nanofibers and the like are generated from the particle surfaces of the composite carbon material and are confirmed to surround these particles.

Embodiment 3

[0065] To 228 parts by mass of a 70 mass % ethanol solution obtained in the same manner as in Example 1, 100 parts by mass of silicon monoxide powder (average particle diameter 6 μm) and 110 ppm of Fe (0.07 parts by mass of iron nitrate) were added, and This was mixed in the same manner as in Example 1 in the above-mentioned high-speed mixer to obtain 328 g of compounded resins. From 300 g of the blended resin, a composite carbon material was obtained in the same manner as in Example 1.

[0066] Observation results of composite carbon materials by scanning electron microscope, and figure 1 Similarly, it was confirmed that carbon nanofibers and the like were generated from the particle surfaces of the composite carbon material and surrounded these particles (not shown).

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Abstract

Disclosed is a carbon material for negative electrodes of lithium secondary batteries, which has improved charge / discharge cycle characteristics. The carbon material for negative electrodes of lithium secondary batteries contains particles capable of absorbing / desorbing lithium ions, a resin carbon material surrounding the particles, and a network structure composed of carbon nanofibers and / or carbon nanotubes bonded to the surfaces of the particles and surrounding the particles. The particles contain carbon, a metal, a metalloid, or an alloy, oxide, nitride or carbide of the carbon, metal or metalloid.

Description

technical field [0001] The invention relates to a carbon material for a negative electrode of a lithium secondary battery and a manufacturing method thereof, a negative electrode of a lithium secondary battery and a lithium secondary battery. Background technique [0002] As electronic devices become lighter and cordless, the demand for smaller and lighter lithium secondary batteries and higher energy density is further increasing. In order to increase the density of lithium secondary batteries, it is known to use tin, silicon, germanium, aluminum alloyed with lithium, or oxides or alloys thereof as the negative electrode material. However, the above-mentioned negative electrode material expands in volume when storing lithium ions for charging, and conversely shrinks in volume when releasing lithium ions for discharging. For this reason, as the charge-discharge cycle is repeated, the volume of the negative electrode material changes, and as a result, it is known that the ne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58C01B31/02H01M4/36H01M4/133H01M4/134H01M4/1393H01M4/1395H01M4/48H01M4/587
CPCY02E60/122H01M4/1393H01M4/134H01M4/133H01M4/1395Y02E60/10H01M4/583H01M10/0525
Inventor 佐佐木龙朗小野哲志渡边毅
Owner SUMITOMO BAKELITE CO LTD
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