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Preparation method for silicon/graphite/solid electrolyte composite negative electrode material

A technology of solid electrolyte and negative electrode material, applied in the direction of negative electrode, battery electrode, active material electrode, etc., can solve the problems of inability to solve lithium ion battery, poor safety, etc., to improve stability and safety, improve conductivity, reduce effect of dosage

Active Publication Date: 2020-03-03
RISESUN MENGGULI NEW ENERGY SCIENCE & TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above three patents still cannot solve the problem of poor stability and safety of lithium-ion battery anode materials

Method used

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  • Preparation method for silicon/graphite/solid electrolyte composite negative electrode material
  • Preparation method for silicon/graphite/solid electrolyte composite negative electrode material
  • Preparation method for silicon/graphite/solid electrolyte composite negative electrode material

Examples

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Effect test

Embodiment 1

[0029] The preparation method steps of the silicon / graphite / solid electrolyte composite material of this embodiment are as follows:

[0030] (1) Preparation of silicon / graphite / solid electrolyte precursor:

[0031] a. Dissolve 50g of binder PEO in 100g of absolute ethanol, and make a solution for later use.

[0032] b. Take 250g of artificial graphite with a particle size D50 of 5 μm, 100 g of nano-silicon powder with a particle size of D50 of 20 nm, 50 g of carbon nanotubes (50-500 nm in diameter, 5-15 μm in length), and 50 g of LATP solid electrolyte into the mixer Carry out dry mixing, and the dry mixing time is 30min.

[0033] c. Add PEO solution and stir for 30 minutes, then add absolute ethanol and continue stirring for 2 hours to adjust the viscosity of the dispersion to 200 mPa·s.

[0034]d. Use a spray granulation dryer to granulate to obtain a silicon / graphite / solid electrolyte precursor.

[0035] (2) Preparation of silicon / graphite / solid electrolyte composite mat...

Embodiment 2

[0039] (1) Preparation of silicon / graphite / solid electrolyte precursor:

[0040] a. Dissolve 50g of binder PPO in 100g of absolute ethanol, and make a solution for later use.

[0041] b. Take 250g of artificial graphite with a particle size D50 of 10μm, 100g of nano-silicon powder with a particle size of D50 of 50nm, 50g of carbon nanotubes (50-500nm in diameter, 5-15μm in length), and 50g of LLTO solid electrolyte into the mixer Dry mixing in 40 minutes.

[0042] c. Add PPO solution, stir for 30 minutes, add absolute ethanol and continue stirring for 4 hours, and adjust the viscosity of the dispersion to 800mPa·s.

[0043] d. Use a spray granulation dryer to granulate to obtain a silicon / graphite / solid electrolyte precursor.

[0044] (2) Preparation of silicon / graphite / solid electrolyte composite material:

[0045] e. Take 50g of high-temperature pitch (particle size D50 is 3 μm), 500g of silicon / graphite / solid electrolyte precursor and add them into the mixer for kneading...

Embodiment 3

[0048] (1) Preparation of silicon / graphite / solid electrolyte precursor:

[0049] a. Dissolve 50g of binder phenolic resin in 100g of absolute ethanol, and make a solution for later use.

[0050] b. Take 250g of natural graphite with a particle size D50 of 15μm, 100g of submicron silicon powder with a particle size of D50 of 500nm, 50g of carbon nanofibers (50-200nm, length 10-20μm), and 50g of LLTO solid electrolyte into the mixer Dry mixing was carried out in the medium, and the dry mixing time was 60 minutes.

[0051] c. Add the phenolic resin solution, stir for 30 minutes, add absolute ethanol and continue stirring for 4 hours, and adjust the viscosity of the dispersion to 200 mPa·s.

[0052] d. Use a spray granulation dryer to granulate to obtain a silicon / graphite / solid electrolyte precursor.

[0053] (2) Preparation of silicon / graphite / solid electrolyte composite material:

[0054] e. Take 50g of high-temperature pitch (particle size D50 is 3 μm), 500g of silicon / grap...

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Abstract

The invention discloses a preparation method for a silicon / graphite / solid electrolyte composite negative electrode material. The preparation method comprises the following steps of: firstly, mixing silicon powder, graphite, a binder, a conductive agent and a solid electrolyte to prepare a dispersion liquid, and then performing spray granulation and drying; and adding asphalt for kneading, sintering at high temperature, crushing, sieving and demagnetizing to obtain the silicon / graphite / solid electrolyte composite negative electrode material. According to the material prepared by the method, a conductive network is formed by utilizing conductive agents such as carbon nanotubes, carbon nanofibers and graphene, so that the conductivity of the material is improved; a high temperature-resistantsolid electrolyte is added, the effect of partial electrolyte can be replaced, an ionic conductance medium is achieved when the electrolyte enters the active material, the use amount of the electrolyte is reduced, and when an SEI film is heated and decomposed, the solid electrolyte can still exist stably, the ionic conductance effect is achieved, and the stability and the safety performance of thesilicon / graphite / solid electrolyte composite negative electrode material are improved.

Description

technical field [0001] The invention relates to the field of negative electrode materials for lithium ion batteries, in particular to a preparation method for silicon / graphite / solid electrolyte composite negative electrode materials for lithium ion batteries. Background technique [0002] Lithium-ion batteries are widely used in various consumer electronic devices and electric vehicles due to their advantages such as high specific energy, high battery voltage, and stable discharge. At present, commercial lithium-ion batteries generally use graphite as the negative electrode. However, the theoretical specific capacity of graphite is only 372mAh / g, which cannot meet the application requirements of lithium-ion power batteries such as large capacity, high power, safety and stability. A new lithium-ion battery anode material to replace graphite. [0003] The theoretical specific capacity of silicon is as high as 4200mAh / g, and the lithium intercalation potential is moderate, mak...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/587H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/587H01M4/624H01M4/625H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 刘建红王兴勤李梦培高亚伦刘贵娟
Owner RISESUN MENGGULI NEW ENERGY SCIENCE & TECHNOLOGY CO LTD
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