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

A technology for lithium secondary batteries and carbon materials, applied in battery electrodes, lithium storage batteries, chemical instruments and methods, etc., can solve the problem that the negative electrode active material is difficult to achieve high capacity, achieve excellent charge-discharge cycle characteristics, and inhibit conductivity. The effect of reducing and simplifying the manufacturing process

Inactive Publication Date: 2011-10-26
SUMITOMO BAKELITE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, although the expansion of the metal is less likely to occur due to the small amount of storage, and the negative electrode is not easily damaged, it is difficult to increase the capacity of the negative electrode active material in the method according to Japanese Patent Application Laid-Open No. 8-241715.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] 135 parts by mass of novolac (novolak) type phenolic resin (PR-50237 manufactured by Sumitomo Bakelite Co., Ltd.) and 25 parts by mass of hexamethylenetetramine (Mitsubishi Gas Chemical Co., Ltd.), 50 parts by mass of silicon monoxide (average particle diameter: 1.2 μm) was further added, and stirred for 2 hours. After the stirring was completed, the obtained slurry was cured at 200° C. for 5 hours. After the curing treatment, the temperature was raised in a nitrogen atmosphere, and carbonization was performed for 1 hour after reaching 500°C. The obtained carbon material was pulverized until the average particle size reached 11 μm, and the temperature of the carbon material obtained by the pulverization treatment was further raised to 1100° C. and then carbonized for 10 hours to obtain a secondary battery carbon material. For the obtained carbon material, when measured by the following measurement method, the pore volume of 0.25 to 0.45 nm is 0.85 cm 3 / g, 55% by volu...

Embodiment 2

[0102] 135 parts by mass of novolac type phenolic resin (PR-50237 manufactured by Sumitomo Bakelite Co., Ltd.) and 25 parts by mass of hexamethylenetetramine (Mitsubishi Gas Chemical Co., Ltd.) were dissolved in a four-necked flask with 30 parts by mass of acetone added. Co., Ltd.), 30 parts by mass of silicon monoxide (average particle diameter: 3.3 μm) was further added, and stirring was performed for 3 hours. After the stirring, the obtained slurry was cured at 200° C. for 3 hours. After the curing treatment, the temperature was raised in a nitrogen atmosphere, and carbonization was performed for 1 hour after reaching 550°C. The obtained carbon material was pulverized until the average particle size reached 7 μm, and the temperature of the carbon material obtained by the pulverization treatment was further raised to 1150° C. and then carbonized for 10 hours to obtain a carbon material for secondary batteries. The 0.25-0.45nm micropore volume of the obtained carbon material...

Embodiment 3

[0104] 135 parts by mass of novolak-type phenolic resin (PR-50237 manufactured by Sumitomo Bakelite Co., Ltd.) and 25 parts by mass of hexamethylenetetramine (Mitsubishi Gas Chemical Co., Ltd.) were dissolved in a four-necked flask containing 45 parts by mass of acetone. Co., Ltd.), further added 45 parts by mass of silicon monoxide (average particle diameter: 0.7 μm), and stirred for 5 hours. After the stirring, the obtained slurry was cured at 200° C. for 3 hours. After the curing treatment, the temperature was raised in a nitrogen atmosphere, and after reaching 500° C., carbonization was performed for 3 hours. The obtained carbon material was pulverized until the average particle size reached 11 μm, and the temperature of the carbon material obtained by the pulverization treatment was further raised to 1100° C. and then carbonized for 5 hours to obtain a secondary battery carbon material. The resulting carbon material was evaluated in the same manner as in Example 1. As a ...

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Abstract

Provided are a carbon material for a negative electrode of a lithium secondary battery having excellent charge / discharge cycle characteristics, a negative electrode of a lithium secondary battery, and a lithium secondary battery using the same. The carbon material for a negative electrode of a lithium secondary battery is characterized by containing composite particles each of which is composed of a silicon-containing particle containing an alloy, oxide, nitride or carbide of silicon, which is capable of absorbing / desorbing lithium ions, and a resin carbon material surrounding the silicon-containing particle, and a network structure composed of a nanofiber and / or nanotube bonded to the surfaces of the composite particles and surrounding the composite particles. The carbon material for a negative electrode of a lithium secondary battery is also characterized in that the network structure contains silicon.

Description

technical field [0001] The invention relates to a carbon material for negative electrodes of lithium secondary batteries, a negative electrode of lithium secondary batteries, a lithium secondary battery and a method for manufacturing the carbon material for negative electrodes of lithium secondary batteries. Background technique [0002] Along with the development of portability and wirelessization of electronic devices, reduction in size and weight and high energy density of lithium secondary batteries are further required. In order to increase the density of lithium secondary batteries, it is known to use silicon, tin, germanium, magnesium, lead, and aluminum alloyed with lithium, or oxides or alloys thereof, as the negative electrode material. However, the above negative electrode material expands in volume during charging to store lithium ions, and conversely shrinks in volume during discharging to release lithium ions. Therefore, it is known that the volume of the nega...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/36H01M4/38H01M4/48
CPCH01M4/131H01M4/134H01M4/136H01M4/364H01M4/366H01M4/38H01M4/48H01M4/58H01M4/587Y02E60/10C01B32/90H01M4/36H01M10/052
Inventor 小野哲志佐佐木龙朗渡边毅
Owner SUMITOMO BAKELITE CO LTD