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Silicon-containing amorphous carbon material, method for producing same, and lithium ion secondary battery

A technology of amorphous carbon and manufacturing method, which is applied in the direction of non-aqueous electrolyte battery electrodes, battery electrodes, final product manufacturing, etc., can solve the problems of negative electrode material electrode shedding, negative electrode material collapse, etc., and achieve cycle characteristics improvement and suppression The effect of volume change

Active Publication Date: 2016-06-22
TODA IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, there is a possibility that the material for the negative electrode may come off from the electrode due to the volume change when the charge-discharge cycle is repeated, and the material for the negative electrode may collapse

Method used

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  • Silicon-containing amorphous carbon material, method for producing same, and lithium ion secondary battery
  • Silicon-containing amorphous carbon material, method for producing same, and lithium ion secondary battery
  • Silicon-containing amorphous carbon material, method for producing same, and lithium ion secondary battery

Examples

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Embodiment approach

[0032] Explanation of silicon-containing amorphous carbon material

[0033] figure 1 It is a diagram showing a micrograph obtained by photographing a cross-section of a silicon-containing amorphous carbon material according to an embodiment of the present invention.

[0034] like figure 1 As shown, the silicon-containing amorphous carbon material 1 according to the present embodiment includes amorphous carbon 4 containing silicon oxide particles represented by SiOx (0<x<2). The silicon oxide particles in the amorphous carbon 4 exist, for example, in a dispersed state. The amorphous carbon 4 is easily graphitizable carbon, so-called soft carbon (soft carbon). Each silicon-containing amorphous carbon material 1 is composed of a plurality of carbon particles derived from raw materials.

[0035] According to such a structure, silicon oxide particles are contained in the amorphous carbon 4, and when used as a negative electrode material of a lithium-ion secondary battery, the i...

Embodiment 1

[0137] Green coke A was pulverized and classified so that D50 was 5.7 μm, green coke particles and silica particles were mixed, and dry granulation was performed as described above. The particle size of the silica particles is 20-30nm. Assuming that the sum of the volumes of the silica particles and green coke particles is 100%, the amount of the silica particles added is 50% by volume.

[0138] Put green coke particles and a part of silica particles into COMPOSICP15 type (manufactured by NIPPONCOKE & ENGINEERING Company, Limited), start the spheroidization process at a low speed, and put all the silica particles in several times. After all the silica particles were charged, the treatment was performed for 120 minutes at a peripheral speed of 80 m / s to obtain granulated particles.

[0139] Next, the granulated particles were subjected to a carbonization treatment under the conditions that the temperature was 1000° C. and the retention time (carbonization time) at the highest ...

Embodiment 2

[0142] Green coke B was pulverized and classified so that D50 was 9.6 μm, green coke particles and silica particles were mixed, and dry granulation and carbonization were performed as described above. At this time, the amount of silica particles added was 53% by volume. All the silica particles were injected several times. After all the silica particles were charged, granulation and carbonization were performed under the same conditions as in Example 1 except that the peripheral speed was 80 m / s and the treatment time was 120 minutes.

[0143] The amorphous carbon material involved in Example 2 obtained as described above has a D50 of 24.9 μm and a BET of 8.1 μm 2 / g, the circularity was 0.953, and the unevenness was 0.976. In addition, the true density is 2.10g / cm 3 , the O / Si ratio (molar ratio) was 1.21. The silicon content of the obtained carbon material was 14.5 wt%.

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Abstract

The present invention provides a silicon-containing amorphous carbon material as an anode material of a lithium ion secondary battery or the like of which the improvement of cycling characteristics is practically possible without a change in volume during charging / discharging. The silicon-containing amorphous carbon material (1) is provided with easily graphitized amorphous carbon (4); silicon oxide particles comprising SiOx (0<x<2) are contained in the easily graphitized amorphous carbon; and a gap is formed at the periphery of the silicon oxide particles. The silicon content in the silicon-containing amorphous carbon material (1) is 1-50 wt% inclusive.

Description

technical field [0001] The technique disclosed in this specification relates to a silicon-containing amorphous carbon material used in a negative electrode of a lithium ion secondary battery and a method for producing the same. Background technique [0002] Compared with conventional secondary batteries, namely nickel-cadmium batteries, nickel-metal hydride batteries, and lead-acid batteries, lithium-ion secondary batteries are light in weight and high in capacity, so this lithium-ion secondary battery has been used as, for example, mobile phones, notebook computers, etc. The power supply for driving portable electronic devices has been put into practical use. This lithium ion secondary battery is also used as a power source for electric vehicles and hybrid vehicles. [0003] As the material for the negative electrode, silicon, tin, germanium or oxides of these elements alloyed with lithium can be used. When intercalating lithium ions, that is, charging, the volume of these...

Claims

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Application Information

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IPC IPC(8): H01M4/587H01M4/36H01M4/48
CPCH01M4/13H01M4/364H01M4/483H01M4/587Y02E60/10Y02P70/50
Inventor 八木下洋平梶浦裕一山口浩平片山美和小田亘滨井健太本田知广冈崎精二坂本明男
Owner TODA IND
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