Silicon-based lithium ion battery negative electrode material and preparation method thereof

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, nanotechnology for materials and surface science, circuits, etc., can solve problems such as capacity decay, inability to fundamentally suppress volume effects, and poor cycle performance.

Active Publication Date: 2013-12-25
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above two methods can alleviate the volume effect of the silicon base to a certain extent, and can also improve the cycle performance and capacity fading of the battery to a certain extent, but the mechanism is the physical recombination of silicon and other metals or high-temperature carbon on the silicon surface. Coating cannot fundamentally suppress the volume effect in the process of charging and discharging. After many cycles, the cycle performance begins to deteriorate, and the capacity will begin to decay

Method used

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  • Silicon-based lithium ion battery negative electrode material and preparation method thereof
  • Silicon-based lithium ion battery negative electrode material and preparation method thereof
  • Silicon-based lithium ion battery negative electrode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Preparation of negative electrode material: at room temperature, add 0.017g sodium dodecylbenzenesulfonate and 0.0165g dodecyl sulfobetaine to 10ml deionized water, and magnetically stir for 0.5 hours to form a mixed surfactant solution; Then, add nano-silica powder into deionized water, stir magnetically for 0.5 hours, configure a 10mg / ml silicon powder suspension, add 20ml of silicon powder suspension (10mg / ml) dropwise to the above mixed surfactant solution, and Stir continuously for 0.5 hours during this process; heat the above solution to 40°C in a water bath environment, and stir for 1 hour; drop 47ul of 3-aminopropyltriethoxysilane and 300ul of ethyl orthosilicate into the above solution respectively, and stir 2 hours; then the mixed solution was heated to 80°C in an oil bath and kept for 24 hours; after the reaction, the product was collected by centrifugation, washed with ethanol and deionized water for several times, and dried; then the product was added to 50...

Embodiment 2

[0044] Negative material preparation

[0045] At room temperature, mix 0.017g sodium dodecylbenzenesulfonate and 0.0165g dodecyl sulfobetaine in a molar ratio of 1:1, add 10ml deionized water, and stir magnetically for 1 hour; Add the powder into deionized water and stir it magnetically for 1 hour to form a 6mg / ml silicon powder suspension. Add 10ml of the silicon powder suspension (6mg / ml) dropwise to the above mixed surfactant solution, and keep stirring during this process ;Heat the above solution to 50°C in a water bath environment, stir for 1 hour, drop 47ul of 3-aminopropyltriethoxysilane and 300ul of ethyl orthosilicate into the above solution respectively, and stir for 1 hour; then mix the solution Heat to 80°C in an oil bath and keep warm for 30 hours; after the reaction, the product is collected by centrifugation, washed with ethanol and deionized water, and dried; then the product is mixed with 26ml of concentrated hydrochloric acid (38%) acetonitrile solution (the...

Embodiment 3

[0049] Negative material preparation

[0050] At room temperature, mix 0.088g sodium dodecylbenzenesulfonate and 0.086g dodecyl sulfobetaine in a molar ratio of 1:1, add 10ml deionized water, and stir magnetically for 2 hours; then, mix 10ml silicon The powder suspension (8mg / mL) was added dropwise into the above mixed surfactant solution, and the stirring was continued during this process; the above solution was heated to 40°C in a water bath environment, and stirred for 2 hours; the 3-aminopropyltri Ethoxysilane 94ul, tetraethyl orthosilicate 300ul were dropped into the above solution respectively, and stirred for 0.5 hours; then the mixed solution was heated to 90°C in an oil bath, and kept for 48 hours; after the reaction, the product was collected by centrifugation , wash the product with ethanol and deionized water respectively, and dry; then add the product to 30ml of concentrated hydrochloric acid (38%) acetonitrile mixed solution (the volume ratio of hydrochloric acid...

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Abstract

The invention discloses a silicon-based lithium ion battery negative electrode material and a preparation method thereof. In the material, a silicon core is coated by a silicon dioxide shell, and a certain space exists between the silicon core and the silicon dioxide shell. The preparation method comprises the steps that at room temperature, a surfactant is added into deionized water and stirred; then a silicon powder suspension liquid is added and stirred; the mixed solution is heated to 40-50 DEG C, 3-aminopropyl triethoxy silane and tetraethyl orthosilicate are respectively dripped into the mixed solution and stirred; then the mixture is heated to 70-90 DEG C, and heat insulation is carried out for 15-48 hours; reaction products are collected in a centrifugal manner, are washed with ethyl alcohol and deionized water respectively, and then are dried; the obtained product is added to an acetonitrile and hydrochloric acid mixed solution and stirred for 4-8 hours, is washed again with deionized water and then is dried, thus obtaining the negative electrode material disclosed by the invention. The lithium embedding capacity of the negative electrode material is higher than 2000mAh / g for the first time, and the specific capacity of the negative electrode material can be still kept to be 520-750 mAh / g after 20 times of repeated charging and discharging circulation.

Description

technical field [0001] The invention relates to a lithium ion battery material, in particular to a silicon-based lithium ion battery negative electrode material and a preparation method thereof. Background technique [0002] With the development of electric vehicles and portable electronic products, lithium-ion secondary batteries have high specific energy, high working voltage, high energy density, long cycle life, small self-discharge, no pollution, light weight, good safety, etc. Advantages, since it was put into the market in 1990, it has developed rapidly, and now it has occupied the mainstream of the market, and its application is becoming more and more extensive. The current commercial lithium-ion battery anode material is a carbon-based anode material, but its theoretical capacity is only 372mAh / g, and it has been developed close to the theoretical value. In order to meet the needs of high-capacity lithium-ion batteries, research and development of high-capacity lith...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/134H01M4/1395B82Y30/00
CPCY02E60/10
Inventor 高濂孙壮宋雪峰张鹏
Owner SHANGHAI JIAO TONG UNIV
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