Preparing method and application of silicon-based negative electrode material with SiO2 coating layer

A technology of silicon-based negative electrode materials and coating layers, applied in battery electrodes, electrical components, electrochemical generators, etc., can solve problems such as poor cycle stability, achieve improved cycle life, simple and feasible preparation process, suitable for large-scale The effect of production

Inactive Publication Date: 2016-04-20
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a preparation method and application of a silicon-based negative electrode material with a SiO coating layer. By sintering the coupling agent layer on the surface of the base silicon material, the poor cycle stability caused by volume expansion is solved. The problem

Method used

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  • Preparing method and application of silicon-based negative electrode material with SiO2 coating layer
  • Preparing method and application of silicon-based negative electrode material with SiO2 coating layer
  • Preparing method and application of silicon-based negative electrode material with SiO2 coating layer

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Effect test

Embodiment 1

[0028] Hydrolyze 0.2g of γ-(2,3-propylene oxide)propyltrimethoxysilane in a mixed solution of ethanol and water (volume ratio 9:1, adjust the pH value to about 4.0 with acetic acid) overnight. Put 1.0g of nano-silicon powder into a three-necked flask containing 45mL of absolute ethanol and 5mL of distilled water for ultrasonic dispersion for 0.5h; mix the two, and reflux for 5h under Ar atmosphere at a temperature of 90°C and magnetic stirring. Then use distilled water / absolute ethanol to alternately centrifuge and wash 3~4 times. Under the condition of 120°C, vacuum dry for 10h.

[0029] The infrared test (FTIR) was carried out on the nano-silicon before and after modification, and the comparison results are as follows: figure 1 As shown, of which 1076cm -1 The absorption peak at corresponds to the antisymmetric vibration of the Si-O-Si bond; 1088cm -1 The peak at corresponds to the asymmetric vibration peak of Si-O-C; while at 2900cm -1 The peaks appearing at , indicati...

Embodiment 2

[0031] 1.76mL of vinyltrimethoxysilane, 0.5g of nano-silica powder, 27ml of absolute ethanol and 6.6ml of distilled water were sonicated for 30min, and 3μL of ammonia water (25% by mass fraction) was added, and magnetically stirred for 2h. Then heated to 50 ° C, the reaction 1h. Then, it was centrifuged and washed three times with absolute ethanol, and dried at room temperature.

Embodiment 3

[0033] Stir and hydrolyze 1 mL of dodecyltrimethoxysilane with 100 mL of absolute ethanol solution (95% by mass, adjust the pH to 4.0-4.5 with acetic acid) for 5 min. Then add nano-silica powder, and magnetically stir the reaction for 30 minutes. After filtering, centrifuge and wash with absolute ethanol for 3 to 4 times, and dry under vacuum at 80°C.

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Abstract

The invention discloses a preparing method and application of a silicon-based negative electrode material with a SiO2 coating layer. The method includes the following steps that 1, a silane coupling agent is subjected to hydrolysis for 12-15 h; 2, nano silicon powder is ultrasonically treated in a water/ethyl alcohol mixed solution for 0.3-2 h; 3, the hydrolyzed silane coupling agent and a nano silicon powder mixed solution are mixed and flow back under the inert gas atmosphere to conduct a temperature-raising reaction; 4, the mixed solution is centrifugally washed and dried in vacuum to obtain a silicon-based negative electrode material with a silane coupling agent coating layer; 5, the negative electrode material is sintered at inert atmosphere to obtain the silicon-based negative electrode material with the SiO2 coating layer, wherein the silicon-based negative electrode material can be applied to a lithium ion battery. Compared with other oxide coating layers, the prepared SiO2 coating layer can improve the circulation stability of the silicon-based material and has high theoretical specific capacity, and the technology is simple and feasible, low in cost and suitable for large-scale production.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery negative electrode materials and electrochemical applications, and relates to a preparation method and application of a silicon-based negative electrode material with a SiO coating layer. Background technique [0002] Secondary batteries have been widely used in portable consumer electronic devices, and have gradually begun to be used in electric vehicles. They have also been identified as very attractive energy storage devices. Among them, lithium-ion batteries (LIBs) have attracted great attention due to their high energy density, good cycle life, and high power performance. The current lithium-ion batteries mostly use graphite materials as negative electrodes, but their theoretical specific capacity is only 372mAh / g, which severely limits the development of batteries. [0003] At present, silicon-based materials have received great attention as anode materials for lithium-ion batt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M10/0525
CPCH01M4/366H01M4/386H01M10/0525Y02E60/10
Inventor 高云智马刊杨春霞付传凯
Owner HARBIN INST OF TECH
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