Unlock instant, AI-driven research and patent intelligence for your innovation.

Silicon-containing amorphous carbon material, manufacturing method thereof, and lithium ion secondary battery

A technology of amorphous carbon and a manufacturing method, which is applied to non-aqueous electrolyte battery electrodes, battery electrodes, and final product manufacturing, etc., can solve problems such as the collapse of negative electrode materials, and the falling off of negative electrode materials and electrodes, so as to improve cycle characteristics and suppress The effect of volume change

Active Publication Date: 2019-04-16
TODA IND
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Silicon-containing amorphous carbon material, manufacturing method thereof, and lithium ion secondary battery
  • Silicon-containing amorphous carbon material, manufacturing method thereof, and lithium ion secondary battery
  • Silicon-containing amorphous carbon material, manufacturing method thereof, and lithium ion secondary battery

Examples

Experimental program
Comparison scheme
Effect test

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] Such as 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. 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 initial disc...

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 COMPOSI CP15 type (manufactured by NIPPON COKE & 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 highes...

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%.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
densityaaaaaaaaaa
particle sizeaaaaaaaaaa
particle sizeaaaaaaaaaa
Login to View More

Abstract

The present invention provides a silicon-containing amorphous carbon material as a negative electrode material used in a lithium ion secondary battery, etc., which has a small volume change during charging and discharging , and the cycle characteristics of the material used in the negative electrode of the lithium ion secondary battery and the like can be practically improved. The silicon-containing amorphous carbon material (1) of the present invention is provided with easily graphitizable amorphous carbon (4), and the easily graphitizable amorphous carbon contains silicon oxide particles composed of SiOx (0<x<2). Voids are formed around the silicon oxide particles. The silicon content of the silicon-containing amorphous carbon material (1) is not less than 1% by weight and not more than 50% by weight.

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
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
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com