Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Lithium ion secondary battery, anode material for same and preparation method of anode material

A negative electrode material and secondary battery technology, applied in battery electrodes, secondary batteries, nanotechnology for materials and surface science, etc., can solve problems such as easy aggregation of nanomaterials, peeling of electrode materials, collapse of material structures, etc., to achieve High first cycle charge and discharge efficiency, good capacity and cycle characteristics

Active Publication Date: 2013-12-11
SHANGHAI INST OF SPACE POWER SOURCES
View PDF5 Cites 22 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the silicon anode material has a serious volume effect under the condition of high intercalation / delithiation, which will lead to the collapse of the structure of the material and the peeling off of the electrode material, resulting in the instability of the electrode cycle performance.
The use of nanomaterials can improve the cycle stability of silicon materials to a certain extent, but nanomaterials are easy to agglomerate, and after many cycles, the active materials will agglomerate, which still cannot fundamentally solve the problem of material cycle stability.

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
  • Lithium ion secondary battery, anode material for same and preparation method of anode material
  • Lithium ion secondary battery, anode material for same and preparation method of anode material
  • Lithium ion secondary battery, anode material for same and preparation method of anode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Preparation of negative electrode material: 50 parts by weight of silicon monoxide, 25 parts of pitch, 25 parts of graphite, and 10 parts of silver acetate were added, and then on a high-energy ball mill with 500 rpm high-speed ball milling for 48 hours, during ball milling Ethanol may be added as a solvent. Put the above mixture into a quartz boat, carbonize at 900°C in a high-temperature tube furnace under the protection of Ar, and ball mill and sieve the carbonized product to obtain silicon composite powder as the negative electrode material. Analysis by X-ray diffractometer (XRD), such as figure 1 As shown, there is no obvious crystallization peak of silicon in its X-ray, which proves that silicon is in an amorphous state in the negative electrode material of the present invention, and there is a diffraction peak of typical metallic silver, which proves that the silver acetate added in the present invention is reduced to metal silver. Transmission through TEM,...

Embodiment 2

[0041] Prepare the negative electrode material: 40 parts by weight of silicon monoxide, 10 parts of silicon and 25 parts of pitch, 25 parts of graphite, and 5 parts of silver acetate are added, and then 48 parts of high-speed ball milling at 400 rpm on a high-energy ball mill. Hours, ethanol can be added as a solvent during ball milling. Put the above mixture into a quartz boat, and carry out carbonization at 1000°C in a high-temperature tube furnace under the protection of Ar, and then ball mill and sieve the carbonized product to obtain silicon composite material powder as the negative electrode material. Analyzed by X-ray diffractometer, such as figure 1 As shown, there is no obvious crystallization peak of silicon in its X-ray, which proves that silicon is in an amorphous state in the negative electrode material of the present invention, and there is a diffraction peak of typical metallic silver, which proves that the silver acetate added in the present invention is re...

Embodiment 3

[0044] Prepare the negative electrode material: 50 parts by weight of silicon dioxide, 25 parts of pitch, and 25 parts of graphite are then ball milled at a high speed of 500 rpm for 48 hours on a high-energy ball mill. Ethanol can be added as a solvent during ball milling. Put the above mixture into a quartz boat, and carry out carbonization at 1000°C in a high-temperature tube furnace under the protection of Ar, and then ball mill and sieve the carbonized product to obtain silicon composite material powder as the negative electrode material. Analyzed by X-ray diffractometer, such as figure 1 As shown, there is no obvious crystallization peak of silicon in its X-ray, which proves that silicon in the negative electrode material of the present invention is in an amorphous state.

[0045] Same as Example 1, the negative electrode material of the present invention was used in the manufacture of the lithium ion secondary battery. The battery was tested according to the test m...

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
Sizeaaaaaaaaaa
Average particle sizeaaaaaaaaaa
Specific surface areaaaaaaaaaaa
Login to View More

Abstract

The invention discloses a lithium ion secondary battery, an anode material for the same and a preparation method of the anode material. The anode material is made of composite particles comprising conductive metal particles and silicon nanoparticles which can be dispersed in silicon oxide, wherein the sizes of each silicon nanoparticle and each conductive metal particle are respectively 1-100nm, and the mole ratio of oxygen to silicon in the anode material is 1.0<O / Si<2. The anode material is prepared through the steps: with silicon-contained oxides as raw materials, sufficiently mixing the silicon-contained oxides, graphite and asphalt, adding a conductive metal salt, carrying out high-energy ball milling, and then, carrying out high-temperature thermal treatment. By using the anode material, the lithium ion secondary battery with high first circulated charging / discharging efficiency and capacity and good circulation performance can be manufactured.

Description

technical field [0001] The invention relates to a negative electrode material and a preparation method for a nonaqueous electrolyte secondary battery, in particular to a negative electrode material and a preparation method for a lithium ion secondary battery. Background technique [0002] With the development of electric vehicles and energy storage technology, higher requirements are placed on the energy density of lithium-ion batteries in terms of economy, size and weight. In terms of negative electrodes of lithium-ion batteries, carbon materials are currently the most used, but due to their Due to the limitation of theoretical capacity (372 mAh / g), it is difficult to improve the capacity. Among many non-carbon materials, silicon-based materials have attracted people's attention due to their mass specific capacity (4200 mAh / g). , the lithium intercalation potential of silicon is between 0 and 0.3V, and the voltage platform of silicon is stable when the lithium is intercalat...

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
IPC IPC(8): H01M4/36H01M4/38H01M10/0525B82Y30/00
CPCY02E60/10
Inventor 丰震河黄莉刘欣宋缙华王可解晶莹
Owner SHANGHAI INST OF SPACE POWER SOURCES
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com