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A kind of silicon-based negative electrode material for lithium ion battery and preparation method thereof

A silicon-based negative electrode material and lithium-ion battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as harsh system configuration conditions, strong toxicity and corrosion, and complex processes, so as to improve charge and discharge performance and increase Conductivity, the effect of alleviating the volume effect

Active Publication Date: 2017-03-08
ZHONGTIAN TECH ADVANCED MATERIALS CO LTD
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  • Application Information

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Problems solved by technology

Patent CN103647064A relates to a preparation method of graphene-coated mesoporous carbon-based metal oxides. Since graphene-coated mesoporous carbon-based metal oxides have excellent electrochemical properties and good cycle performance, the process is complicated and It is difficult to scale up, and hydrofluoric acid HF is highly toxic and corrosive, which is harsh to the system configuration conditions and produces pollutants

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  • A kind of silicon-based negative electrode material for lithium ion battery and preparation method thereof
  • A kind of silicon-based negative electrode material for lithium ion battery and preparation method thereof
  • A kind of silicon-based negative electrode material for lithium ion battery and preparation method thereof

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preparation example Construction

[0033] A preparation method of a silicon-based negative electrode material for a lithium-ion battery is as follows:

[0034] 1. Silica powder waste purification pretreatment

[0035] The silicon dioxide powder waste produced by the vapor deposition method in optical fiber production is pickled, soaked in hydrochloric acid, sulfuric acid or nitric acid with a concentration of 5% to 15%, stirred for 2 to 3 hours to remove impurities introduced during collection and shipment, and then used Wash and filter repeatedly with deionized water, and finally dry the filtered product.

[0036] 2. Preparation

[0037] Add the silicon dioxide powder obtained by pickling and purification into deionized water to disperse, heat in a water bath, control the temperature of the water bath at 50°C~80°C, stir magnetically or ultrasonically for 3~4 hours, and wait until the silicon dioxide powder is fully dispersed , add carbon material and stir evenly, then add graphene material and stir until uni...

Embodiment 1

[0049] (1) The silicon dioxide powder waste produced by the vapor deposition method in optical fiber production is subjected to pickling pretreatment. Add it into hydrochloric acid with a concentration of 8% to soak to remove impurities, stir for 2 hours, filter with deionized water to wash and filter repeatedly, and finally dry the filtered product.

[0050] (2) Take 10g of purified silica powder and add it to deionized water for dispersion. The temperature of the water bath is controlled at 60°C. After ultrasonic vibration and dispersion for 3 hours, add 5g of artificial graphite particles, and then add 35g of graphene. After the dispersion is uniform, a And put it into an agate jar with a ball-to-material ratio of 4:1, ball mill in a planetary mill for 4 hours, wash and filter with deionized water, and dry for 5 hours.

[0051] (3) Add the above mixed powder into the sintering furnace, control the temperature at 1300°C at a heating rate of 10°C / min, and calcine at a constan...

Embodiment 2

[0053] (1) Obtain purified silica powder according to Example 1.

[0054] (2) Take 17.5g of purified silica powder and add it to deionized water to disperse. The temperature of the water bath is controlled at 60°C. After dispersing by ultrasonic vibration for 3 hours, add 10g of the mixture of mesocarbon microspheres and graphitized carbon fibers, and then add Put 22.5g of graphene into an agate jar with a ball-to-material ratio of 4:1, mill in a planetary mill for 5 hours, wash and filter with deionized water, and dry for 5 hours.

[0055] (3) Add the above mixed powder into the sintering furnace, control the temperature at 1450°C at a heating rate of 5°C / min, and calcine at a constant temperature for 7 hours. 2 Mixed with Ar, H 2 Accounting for 50%, the furnace body pressure is maintained at 100pa, and silicon, silicon carbide, carbon, graphene composite materials are obtained after natural cooling. The lithium-ion battery prepared by using this material is charged and dis...

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Abstract

The invention relates to a silicon-base negative material for a lithium ion battery and a preparation method of the silicon-base negative material. Superfine silicon dioxide powder waste generated in a vapor deposition method in the production of an optical fiber is adopted, after the silicon dioxide powder waste is pickled and purified, the silicon dioxide powder waste is mixed and wet ground with a carbon material and graphene, a silicon dioxide superfine vitreous body is enabled to tightly contact the carbon material and graphene, then the waste is filtered and dried, the carbon reduction sintering is carried out under a given system pressure of 60pa to 150pa and at the temperature of 1300 to 1600 DEG C in a reduction atmosphere, the waste is sintered for 4 to 10 hours at constant temperature, a sintered product is naturally cooled to obtain silicon dioxide, the silicon dioxide is used as an elastic substrate, and a silicon, silicon carbide, carbon and graphene composite lithium battery negative material is formed on the substrate.

Description

technical field [0001] The invention relates to a silicon-based composite negative electrode material for a lithium ion battery and a preparation method thereof. Background technique [0002] Lithium-ion batteries have attracted much attention due to a series of remarkable characteristics such as high specific capacity, long cycle life, wide operating temperature range, and no memory effect. Among them, the performance of negative electrode materials directly affects the performance of lithium-ion batteries. Currently commercial negative electrode materials such as graphite, hard carbon, lithium titanate, etc. Due to factors such as the low theoretical capacity of graphite materials and high selectivity to electrolytes, people are looking for alternative materials. As we all know, as the negative electrode material of lithium-ion batteries, silicon material has the highest theoretical specific capacity (up to 4200mAh / g), which is much higher than that of carbon materials w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/134H01M4/1395H01M4/38
CPCY02E60/10
Inventor 吴椿烽沈一春钱宜刚
Owner ZHONGTIAN TECH ADVANCED MATERIALS CO LTD
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