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Preparation method of novel silylene anode material

A negative electrode material, silicene technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of fast capacity decline, large volume expansion, poor conductivity, etc., achieve improved rate performance, relieve volume expansion stress, and fast Li-ion and the effect of electron diffusion

Inactive Publication Date: 2018-09-21
FUJIAN XFH NEW ENERGY MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In view of this, the present invention aims at the deficiencies in the prior art, and its main purpose is to provide a method for preparing a novel silicene negative electrode material, which can effectively solve the problems of large volume expansion and capacity decline in existing silicon-based lithium ion negative electrode materials. Fast, poor conductivity

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preparation example Construction

[0015] The present invention discloses a preparation method of a novel silicene negative electrode material, comprising the following steps:

[0016] (1) Nano-silicon particles indicate activation: Add 0.5-1.5g of nano-silicon powder to 0.5-1.5L of absolute ethanol to disperse; then add 8-12ml of surfactant 3-aminopropyltriethoxysilane (APTES) In the dispersion system of silicon powder, ultrasonic for 15-25h; then filter and wash with absolute ethanol for 2-4 times to obtain silicon slurry.

[0017] (2) Mixing process of nano-silica powder and graphene: add the above-mentioned surface-activated silicon slurry into 0.5-1.5L of absolute ethanol, add graphene powder, and ultrasonicate for 15-25h; then blow dry at 50-70°C to obtain Precursor: put the precursor into a tube furnace, and calcinate in an argon atmosphere at 550-650°C for 1-3h, with a heating rate of 2-5°C / min.

Embodiment 1

[0020] A method for preparing a novel silicene negative electrode material, comprising the following steps:

[0021] (1) Nano-silicon particles indicate activation: Add 1g of nano-silicon powder to 1L of absolute ethanol to disperse; then add 10ml of surfactant 3-aminopropyltriethoxysilane to the dispersion of silicon powder, ultrasonic for 20h; then Filter and wash 3 times with absolute ethanol to obtain a silicon slurry.

[0022] (2) Mixing process of nano-silica powder and graphene: add the above-mentioned surface-activated silicon slurry into 1L of absolute ethanol, add graphene powder, and ultrasonicate for 20 hours; then blow and dry at 60°C to obtain a precursor; Put it into a tube furnace, and calcinate for 2 hours at 600°C in an argon atmosphere, with a heating rate of 3°C / min.

[0023] like figure 1 Shown, is the scanning electron microscope picture that obtains dilute silicon in the present embodiment, by figure 1 It can be seen that the nano-silica powder is com...

Embodiment 2

[0026] A method for preparing a novel silicene negative electrode material, comprising the following steps:

[0027] (1) Activated nano-silicon particles: Add 0.5g of nano-silicon powder to 1.5L of absolute ethanol to disperse; then add 8ml of surfactant 3-aminopropyltriethoxysilane to the dispersion of the silicon powder, and ultrasonicate for 25 hours; Then, it was filtered and washed twice with absolute ethanol to obtain a silicon slurry.

[0028] (2) Mixing process of nano-silica powder and graphene: add the above-mentioned surface-activated silicon paste into 0.8L of absolute ethanol, add graphene powder, and ultrasonicate for 18 hours; then blow dry at 60°C to obtain the precursor; The body was put into a tube furnace, and calcined in an argon atmosphere at 550 °C for 1 h, and the heating rate was 2 °C / min.

[0029] After testing, the first discharge capacity of the silicene obtained in this example is 2753.6 mAh / g, the first charge capacity is 2291.0 mAh / g, the second ...

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Abstract

The invention discloses a preparation method of a novel silylene anode material. The method comprises the following steps: (1), surface activation of nanometer silicon particles: adding 0.5 to 1.5g ofnanometer silicon powder into 0.5 to 1.5 L of absolute ethyl alcohol to disperse the nanometer silicon powder; adding 8 to 12 ml of surfactant 3-aminopropyl triethoxysilane into a silicon powder dispersion system, and performing ultrasonic dispersion for 15 to 25 h; then performing suction filtration and cleaning for 2 to 4 times through absolute ethyl alcohol, so as to obtain silicon pulp; (2),mixing technology of the nanometer silicon powder and graphene. In the method, a nanometer laminated structure serves as a buffer for volume expansion during a circulation period, and in addition, in-situ prepared Si nanometer structures with the size being smaller than 100 nm are uniformly dispersed in a graphene laminated structure, so that volume expansion stress is effectively relieved. The introduced unique laminated structure allows rapider lithium ion and electron diffusion, and in turn, the structure has excellent electrochemical performance, and particularly has better cycling stability and improved rate capability.

Description

technical field [0001] The invention relates to the technology in the field of negative electrode materials, in particular to a preparation method of a novel silicene negative electrode material. Background technique [0002] Silicon is currently one of the most promising anode materials for lithium-ion batteries that can replace existing carbon-based materials. Silicon has a higher theoretical capacity than other materials and is abundant in reserves, so it is one of the hotspots of extensive research. The advantages of silicon-based lithium-ion anode materials are as follows: (1) High energy density: high theoretical mass specific capacity and volume specific capacity. (2) High safety: the voltage platform is higher than that of graphite, and it is not easy to form lithium branch crystals on the electrode surface during charging and discharging, so it is safer as a negative electrode material for lithium batteries. (3) Abundant reserves and low cost of raw materials. Ho...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/583
CPCH01M4/386H01M4/583Y02E60/10
Inventor 王智胜周鹏伟赵东辉
Owner FUJIAN XFH NEW ENERGY MATERIALS CO LTD