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Silicon-base negative material with silane coupling agent and conductive polymer two-layer cladding structure as well as preparation method and application of material

A silicon-based negative electrode material and silane coupling agent technology, applied in battery electrodes, structural parts, circuits, etc., can solve problems such as hindering the commercialization process and high cost, and achieve high specific capacity, high initial Coulombic efficiency, heavy good effect

Active Publication Date: 2014-08-20
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

B.J. Neudecker et al. prepared SiSn0.87O1.20N1.72, with a specific capacity close to 800 mAh / g, which can still be maintained after 10,000 charge-discharge cycles At 600 mAh / g, the discharge voltage is 4.1-2.7V, and the irreversible capacity loss per cycle is within 0.002%, but the high cost hinders its commercialization process

Method used

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  • Silicon-base negative material with silane coupling agent and conductive polymer two-layer cladding structure as well as preparation method and application of material
  • Silicon-base negative material with silane coupling agent and conductive polymer two-layer cladding structure as well as preparation method and application of material
  • Silicon-base negative material with silane coupling agent and conductive polymer two-layer cladding structure as well as preparation method and application of material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1. Mix 0.1g of γ-(methacryloyloxy)propyltrimethoxysilane with 45mL of ethanol and 5mL of water in a three-necked flask for hydrolysis, add 4.9g of silicon powder, and mix ultrasonically for 0.5h; at an air flow rate of 200mL / min, temperature at 80°C, reflux for 10 h under magnetic stirring conditions, and vacuum drying at 55°C for 12 h to finally obtain γ-(methacryloyloxy)propyltrimethoxysilane surface-modified with a mass concentration of 2%. Silicon-based anode materials. The schematic diagram of the reaction between silane coupling agent and elemental silicon substrate is as follows: figure 1 As shown, starting from the simple silicon substrate, the first cladding layer is a silane coupling agent modification layer, and the second cladding layer is a proton-acid-doped conductive polyaniline. The infrared spectrum with silane coupling agent coating layer is as follows Figure 5 shown at 2972 ​​and 2926 cm -1 An absorption peak appears at , which corresponds to the...

Embodiment 2

[0036] 1. Mix 0.25g of γ-(methacryloyloxy)propyltrimethoxysilane with 45mL of ethanol and 5mL of water in a three-neck flask for hydrolysis, add 4.75g of silicon powder, and mix ultrasonically for 0.5h; at an air flow rate of 200mL / min, temperature at 80°C, reflux for 10 h under magnetic stirring conditions, and vacuum drying at 55°C for 12 h to finally obtain γ-(methacryloyloxy)propyltrimethoxysilane surface-modified with a mass concentration of 5%. Silicon-based anode materials.

[0037] 2. Ultrasonic blend 0.045 g of aniline monomer and 0.2 g of modified silicon powder in 30 mL of 3.1% by volume hydrochloric acid system for 0.5 h, the ultrasonic power is 1.5 w / cm, the ultrasonic frequency is 30 kHz, and then heated at 0-5 °C 30 mL of a 3.1% by volume hydrochloric acid solution containing 0.0216 g of ammonium persulfate was added dropwise to carry out in-situ polymerization, and the polymerization reaction time was 10 h.

[0038] 3. Wash the mixed solution in step 2 altern...

Embodiment 3

[0041] 1. Mix 0.1g of γ-(methacryloyloxy)propyltrimethoxysilane with 45mL of ethanol and 5mL of water in a three-necked flask for hydrolysis, add 4.9g of silicon powder, and mix ultrasonically for 0.5h; at an air flow rate of 200mL / min, temperature at 80°C, reflux for 10 h under magnetic stirring conditions, and vacuum drying at 55°C for 12 h to finally obtain γ-(methacryloyloxy)propyltrimethoxysilane surface-modified with a mass concentration of 2%. Silicon-based anode materials.

[0042] 2. Ultrasonic blend 0.09g of aniline monomer and 0.2g of modified silicon powder in 30mL of 3.1% by volume hydrochloric acid system for 0.5 h, the ultrasonic power is 1.5w / cm, the ultrasonic frequency is 30kHz, and then heated at 0-5℃ 30 mL of a 3.1% by volume hydrochloric acid solution containing 0.0432 g of ammonium persulfate was added dropwise to carry out in-situ polymerization, and the polymerization reaction time was 10 h.

[0043] 3. Wash the mixed solution in step 2 alternately wi...

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Abstract

The invention discloses a silicon-base negative material with a silane coupling agent and conductive polymer two-layer cladding structure as well as a preparation method and application of the material. The silicon-base negative material is characterized in that monomer silicon is adopted as a substrate, the substrate is coated with a silane coupling agent decorative layer, and the silane coupling agent decorative layer is coated with protonic acid doping-state conductive polyaniline. The preparation method comprises the following steps: (1) ultrasonically blending a silane coupling agent and silicon powder, and refluxing the mixture of the silane coupling agent and the silicon powder at a given temperature so as to decorate the silicon powder; (2) ultrasonically blending aniline monomer and decorated silicon powder in an acid solution system, and performing in-situ polymerizing on the aniline monomer and the decorated silicon powder to obtain a silicon-base composite material which is coated with the conductive polymer; (3) washing, suction-filtering and vacuum-drying the mixed solution to obtain the silicon-base negative material with the silane coupling agent and conductive polymer two-layer cladding structure. When being doped in graphite, the silicon-base negative material can be used for preparing a negative material of a lithium ion battery. The preparation method is simple and easy, low in manufacturing cost, good in repeatability and convenient for industrialized mass production.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery negative electrode materials and electrochemistry, and relates to a silicon-based negative electrode material with a double-layer coating structure of a silane coupling agent and a conductive polymer, and a preparation method and application thereof. Background technique [0002] In recent years, compared with traditional secondary batteries such as lead-acid batteries, iron batteries, and nickel-metal hydride batteries, lithium-ion batteries have the advantages of high energy density, high output voltage, low self-discharge, small memory effect, and environmental friendliness, and have gained a lot of attention. Extensive application and research. The performance of key materials for lithium-ion batteries is an important determinant of battery performance, and the development and improvement of negative electrode materials is a global research hotspot. Negative electrode materials su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/62
CPCH01M4/386H01M4/62H01M4/624H01M10/0525Y02E60/10
Inventor 高云智陈思源王龙
Owner HARBIN INST OF TECH
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