Preparation method of lithium-ion battery anode material that effectively buffers silicon volume effect

A lithium-ion battery, volume effect technology, applied in battery electrodes, nanotechnology for materials and surface science, secondary batteries, etc., can solve problems such as unsatisfactory cycle life, nano-silicon-based material preparation technology needs to be improved, etc. Achieve excellent long-term cycle stability and rate performance, increase electron and ion transmission efficiency, and buffer volume expansion

Active Publication Date: 2020-10-16
XIFENG 2D FUJIAN MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is still far from meeting the cycle life required for its practical application
Therefore, the existing nano-silicon-based material preparation technology used in the preparation method of lithium-ion battery negative electrode materials needs to be improved.

Method used

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  • Preparation method of lithium-ion battery anode material that effectively buffers silicon volume effect
  • Preparation method of lithium-ion battery anode material that effectively buffers silicon volume effect
  • Preparation method of lithium-ion battery anode material that effectively buffers silicon volume effect

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preparation example Construction

[0023] Such as figure 1 Shown, the preparation method of the negative electrode material of the lithium ion battery of effectively buffering silicon volume effect, described method comprises the following steps:

[0024] S01, preparing modified graphene microchips;

[0025] S02, growing nano-silicon spheres on the surface of the graphene micro-sheets to obtain a graphene micro-sheet-nano-silicon sphere composite material;

[0026] S03. Depositing a metal oxide layer with a precise thickness on the surface of graphene microflakes-nano-silicon spheres by atomic layer deposition technology;

[0027] S04, uniformly dispersing the graphene microchip-nano-silicon sphere composite material with a metal oxide layer deposited on the surface into the electrospinning solution, performing electrospinning and calcination treatment, to obtain a carbon nanofiber composite material;

[0028] S05. Carry out acid treatment to the carbon nanofiber composite material, completely remove the meta...

Embodiment 1

[0034]First, put the expanded graphite in a container, add 250ml of NMP, stir evenly, and oscillate for 10 hours at an ultrasonic oscillation power of 800W and a temperature of 75°C to obtain a suspension of graphene microflakes; then let it stand for 180 minutes, and take the upper suspension , remove the precipitate, filter and dry at 70°C to obtain graphene microflakes; then add the obtained graphene microflakes to 80ml of concentrated sulfuric acid, keep the solution temperature below 4°C, and slowly add 1g of potassium permanganate , keep the temperature of the solution below 10°C and stir magnetically for 90min, at the same time, slowly add 150ml of deionized water during the magnetic stirring process; add 3ml of hydrogen peroxide after stirring, and continue stirring for 20min; finally filter and dry to obtain surface modified graphite ene microchips;

[0035] Then put the obtained graphene microchips into the chemical vapor deposition (CVD) reaction chamber, vacuumize ...

Embodiment 2

[0039] First, put the expanded graphite in a container, add 150ml of DMF, stir evenly, and oscillate for 8 hours under the conditions of ultrasonic oscillation power of 1000W and temperature of 80°C to obtain a suspension of graphene microflakes; then stand still for 180min, and take the upper suspension , remove the precipitate, filter and dry at 70°C to obtain graphene microflakes; then add the obtained graphene microflakes to 100ml of concentrated sulfuric acid, keep the solution temperature below 4°C, and slowly add 0.5 potassium permanganate , keep the temperature of the solution below 10°C and stir it magnetically for 120min. During the process of magnetic stirring, slowly add 150ml of deionized water; after stirring, add 3ml of hydrogen peroxide, and continue stirring for 30min; finally filter and dry to obtain surface-modified graphite ene microchips;

[0040] Then put the obtained graphene microchips into the chemical vapor deposition (CVD) reaction chamber, vacuumize...

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Abstract

A manufacturing method of a lithium-ion battery negative-electrode material effectively buffering a volume change effect of silicon. The method comprises the following steps: preparing modified graphene nanoplatelets (S01); growing silicon nanospheres on the graphene nanoplatelets to obtain a graphene nanoplatelet-silicon nanosphere composite material (S02); depositing, by means of atom layer deposition, a metal oxide layer on the graphene nanoplatelet-silicon nanosphere surface (S03); performing electrospinning and calcination to obtain a carbon nanofiber composite material (S04); performing an acid treatment on the carbon nanofiber composite material to remove the metal oxide layer and form a pore structure (S05); and forming a carbon coating layer outside of the carbon nanofiber composite material (S06). The manufacturing method of the present invention has a simple manufacturing process, and the material has an accurate and controllable pore structure to effectively buffer volume expansion during a charging-discharging process. In addition, a carbon coating layer is formed as an outmost layer to further protect silicon nanospheres, thus ensuring integrity of an electrode structure, and improving stability of the electrode structure.

Description

technical field [0001] The invention relates to the technical field of preparation methods of lithium-ion battery negative electrode materials, in particular to a preparation method of lithium-ion battery negative electrode materials that can effectively buffer the volume effect of silicon. Background technique [0002] Lithium-ion batteries (LIBs) are ubiquitously used in portable electronics and network storage due to their relatively high discharge voltage, energy density, and good power performance. At present, more research is pursuing electrode materials with high theoretical capacity to replace the graphite anode materials that have been developed so far. Among them, silicon-based anode materials are the most attractive alternatives because of their very high theoretical capacity of 4200mAh g-1 (forming Li4. 0.4V). However, the electrode cycle life is limited due to cracking and pulverization caused by its large volume change (up to 311%) during the charge-discharge...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/364H01M4/366H01M4/386H01M4/583H01M4/625H01M10/0525H01M4/36Y02E60/10
Inventor 许志
Owner XIFENG 2D FUJIAN MATERIAL TECH CO LTD
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