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Dual-layer-coated nanometer silicon negative electrode material and preparation method and application thereof

A negative electrode material and double-layer coating technology, which is applied in the field of double-layer composite-coated nano-silicon negative electrode material and its preparation, can solve problems such as the negative impact of material cycle performance, achieve excellent electrochemical performance, increase conductivity, inhibit The effect of volume expansion

Inactive Publication Date: 2017-12-19
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method plated copper on the silicon surface, there were many copper particles on the silicon surface, and no copper film was formed, which could not effectively avoid the direct contact between silicon and electrolyte to form an unstable SEI, and the copper formed by this method Contains a large amount of cuprous oxide, which has a negative impact on the cycle performance of the material

Method used

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  • Dual-layer-coated nanometer silicon negative electrode material and preparation method and application thereof
  • Dual-layer-coated nanometer silicon negative electrode material and preparation method and application thereof
  • Dual-layer-coated nanometer silicon negative electrode material and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0044] (1) Weigh 0.5g of silicon powder with a particle size of 100nm and put it into 1000ml of water, then add 20ml of ethanol to obtain a nano-silicon suspension, and then place the nano-silicon suspension in an ultrasonic machine for ultrasonication for 2 hours;

[0045] (2) The ultrasonically dispersed nano-silicon suspension is continuously stirred with a magnetic stirrer, and nitrogen gas is continuously introduced into the solution at the same time. Then add the following copper plating agent in the solution: 1g CuSO 4 , 10 g of potassium sodium tartrate, 10 g of ethylenediamine tetraacetic acid and 5 mg of 2,2-bipyridine, and then adding sodium hydroxide to adjust the pH to 10. Then add 0.6g of sodium borohydride to 200ml of water, and add sodium hydroxide to adjust the pH to 10, then drop it into the nano-silicon suspension at a rate of about 30 drops / min, and finally filter and add copper protective agent to wash 1. Obtain nano-silicon composite material coated with...

Embodiment 2

[0048] (1) Weigh 0.5g of 100nm silicon powder and put it into 1000ml of water, then add a small amount of 20ml of ethanol to obtain a nano-silicon suspension, and then place the nano-silicon suspension in an ultrasonic machine for ultrasonication for 2 hours;

[0049] (2) The ultrasonically dispersed nano-silicon suspension is continuously stirred with a magnetic stirrer, and nitrogen gas is continuously introduced into the solution at the same time. Then add the following copper plating agent in the solution: 1g CuSO 4 , 10 g of potassium sodium tartrate, 10 g of ethylenediamine tetraacetic acid and 5 mg of 2,2-bipyridine, and then adding sodium hydroxide to adjust the pH to 10. Then add 0.6g of sodium borohydride to 200ml of water, and add sodium hydroxide to adjust the pH to 10, and then drop it into the nano-silicon solution at a speed of about 30 drops / min, and finally filter, add copper protective agent to wash, vacuum Obtain the nano-silicon composite material coated w...

Embodiment 3

[0053] (1) Weigh 0.5g of silicon powder with a particle size of 100nm and put it into 1000ml of water, then add 20ml of ethanol to obtain a nano-silicon suspension, and then place the nano-silicon suspension in an ultrasonic machine for ultrasonication for 2 hours;

[0054] (2) The ultrasonically dispersed nano-silicon suspension is continuously stirred with a magnetic stirrer, and nitrogen gas is continuously introduced into the solution at the same time. Then add the following copper plating agent in the solution: 1g CuSO 4 , 10 g of potassium sodium tartrate, 10 g of ethylenediamine tetraacetic acid and 5 mg of 2,2-bipyridine, and then adding sodium hydroxide to adjust the pH to 10. Then add 0.6g of sodium borohydride to 200ml of water, and add sodium hydroxide to adjust the pH to 10, then drop it into the nano-silicon suspension at a rate of about 30 drops / min, and finally filter and add copper protective agent to wash 1. Obtain nano-silicon composite material coated with...

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Abstract

The invention provides a dual-layer-coated nanometer silicon negative electrode material and a preparation method and an application thereof. The negative electrode material comprises silicon-based nanoparticles, a copper layer for coating the surfaces of the silicon-based nanoparticles, and a conductive protection layer for coating the surface of the copper layer. The nanometer copper has super-plastic extensibility and conductivity; in addition, the existing calculation already proves that lithium ions can penetrate through the nanometer copper, so that the copper coating layer can suppress volume expansion of the silicon-based nanoparticles and keep the silicon-based nanoparticles not cracked; therefore, direct contact between the silicon-based nanoparticles and an electrolyte can be avoided effectively, thereby forming a stable SEI and improving conductivity of an electrode; however, the nanometer copper is easily oxidized to form copper oxide and cuprous oxide to form an adverse SEI on the surface; and therefore, the surface of the nanometer copper is coated with the conductive protection layer so as to effectively suppress oxidization of the nanometer copper, thereby improving electrochemical performance.

Description

technical field [0001] The invention relates to the field of negative electrode materials for lithium ion batteries, in particular to a double-layer composite coated nano-silicon negative electrode material and a preparation method and application thereof. Background technique [0002] Due to the rapid development and wide application of portable electronic devices and electric vehicles, there is an urgent need for lithium-ion batteries with high specific energy and long cycle life. At present, commercially used lithium-ion batteries mainly use graphite as the negative electrode material. However, the theoretical specific capacity of graphite is only 372mAh / g, which limits the further improvement of the specific energy of lithium-ion batteries. [0003] Silicon has attracted great attention from researchers because of its extremely high theoretical lithium intercalation specific capacity (up to 4200mAh / g) and low lithium storage potential, and is one of the ideal candidates ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M4/134H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/134H01M4/366H01M4/386H01M4/625H01M4/626H01M4/628H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 金周俞海龙黄学杰
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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