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A new type of silicon monoxide-based negative electrode material for lithium-ion batteries and its preparation method and application

A lithium-ion battery, silicon monoxide-based technology, applied in the field of lithium-ion batteries, can solve the problems of the first discharge capacity to be improved, technical operation complexity, etc., and achieve the effect of easy promotion and use, abundant raw material sources, and buffer volume expansion

Active Publication Date: 2018-08-03
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, some studies have introduced silicon monoxide (SiO) instead of silicon as the main body of the negative electrode material. For example, Yoon Hwa et al. made SiO undergo disproportionation reaction under high temperature conditions, and then performed high-energy ball milling to improve the performance of SiO. After testing, it was the first time The discharge capacity is 1001.8mAh / g, and the 50th discharge capacity is 1000mAh / g. It can be seen that the reversible capacity of the battery is high and the cycle performance is stable; however, the operation of this technology is complicated, and the first discharge capacity needs to be improved.

Method used

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  • A new type of silicon monoxide-based negative electrode material for lithium-ion batteries and its preparation method and application
  • A new type of silicon monoxide-based negative electrode material for lithium-ion batteries and its preparation method and application
  • A new type of silicon monoxide-based negative electrode material for lithium-ion batteries and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] The silicon monoxide-based negative electrode material of the present embodiment, the material that adopts has polyacrylonitrile (PAN) and silicon monoxide nanoparticle

[0062] (1) Dissolve PAN and silicon monoxide nanoparticles in N,N-dimethylformamide (NMP for short) organic solvent with a mass ratio of 3:7 at a ratio of 1:20 (mass ratio of solute to solvent), and ultrasonically After 1 h of treatment, magnetic stirring was carried out at room temperature for 12 h to obtain a mixed solution.

[0063] (2) The solution obtained in step 1) was volatilized until it became viscous, then sonicated again for 1 hour, and then spread evenly on the copper foil to obtain a pole piece.

[0064] (3) Place the pole piece obtained in step 2) in a tube furnace for calcination under the protection of an argon atmosphere, at a temperature of 500°, for 12 hours (heating rate 5° / min), and after cooling down to room temperature, the PAN@SiO-based Negative material.

[0065] The final p...

Embodiment 2-5

[0070] The silicon monoxide-based negative electrode material was prepared by the same method as in Example 1, except that PAN was replaced by 5-chlorovaleronitrile, 3-chloro-5-hydroxybenzonitrile, acrylic acid and aniline, respectively.

[0071] Compound and product number used in table 1 embodiment 2-5

[0072]

compound

product number

Example 2

5-chlorovaleronitrile

CNCl@SiO

Example 3

3-Chloro-5-hydroxybenzonitrile

CNOCl@SiO

Example 4

acrylic

CO@SiO

Example 5

aniline

CN@SiO

[0073] Adopt the same method as in Example 1 to measure the half-battery cycle of the lithium-ion battery with CNCl@SiO, CNOCl@SiO, CO@SiO, CN@SiO-based negative electrode materials to 50 cycle performance curves, and embodiment 1 The results are similar for PAN@SiO-based anode materials. It has been confirmed that the above-mentioned negative electrode material can maintain the contact stability of the active material on...

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Abstract

The invention relates to a silicon-monoxide-based negative electrode material for a lithium ion battery. The raw materials of the negative electrode material comprise silicon monoxide nanoparticles and one or some of four compounds. High conductivity and special viscosity of the compounds are utilized, high cycle capacity of the silicon-monoxide nanoparticles is kept, the cycling stability is raised, and a service life of a battery is prolonged. The negative electrode material meets negative electrode capacity requirements by a lithium ion battery positive electrode material, and achieves commercial scale production conditions.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a silicon monoxide-based negative electrode material for lithium ion batteries and a preparation method and application thereof. Background technique [0002] With the continuous consumption of traditional non-renewable energy and the deterioration of the global environment, we must change the way of unsustainable energy use, and the development of green new energy is imminent. In the past 20 years, the research and development of new chemical power sources with high energy density, long service life, safety and pollution-free has been the focus of scientific research personnel. The development and use of battery technology has played an important role in changing the energy structure. Traditional lead-acid batteries, nickel-metal hydride batteries, and nickel-cadmium batteries have low energy density, poor energy utilization rate, poor high-current cha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/0525
CPCH01M4/366H01M4/483H01M4/625H01M10/0525Y02E60/10
Inventor 王敬周美娟吴锋陈实苏岳峰
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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