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Silicon-carbon composite negative electrode material, negative electrode and lithium secondary battery

A negative electrode material, silicon-carbon composite technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problem of low energy density, achieve the effect of improving energy density, excellent life performance, and improving cycle life

Pending Publication Date: 2022-06-07
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] At present, the mixed material of silicon-based composite material and graphite is used as the negative electrode material in the commercialized negative electrode, so the increase in actual energy density is not high

Method used

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  • Silicon-carbon composite negative electrode material, negative electrode and lithium secondary battery
  • Silicon-carbon composite negative electrode material, negative electrode and lithium secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] The present embodiment provides a silicon-carbon composite anode material (referred to as a Si / C composite material) and a preparation method thereof, the preparation method comprising the following steps:

[0057]30 g of silicon nanoparticles were treated in piranha solution (6 L) at 85 °C for 2 h, and the Piranha-treated silicon particles were repeatedly washed three times with distilled water and filtered. Take 30 g of washed silicon nanoparticles and disperse them in 1 L distilled water for 1 h. Add 375 ml (3-aminopropyl) triethoxysilane (APTES) (APTES mass of 355 g) and 44 g silicon nanoparticles, stirred at 70 °C for 4 hours, repeatedly filtered four times with distilled water, and then dried in a vacuum oven at 100 °C to give APTES-coated silicon nanoparticles.

[0058] Take 30g of the above-mentioned dried APTES-coated silicon nanoparticles, mix with 1000g graphene oxide (GO) gel (wherein, 20g GO) and sucrose, add water for 2h after sonication spray drying, heat t...

Embodiment 2

[0061] Preparation of electrodes

[0062] Dissolve 5 g of polyacrylic acid (PAA) and 5 g of sodium carboxymethyl cellulose (NaCMC) in 490 g of distilled water to prepare a 500 g mass concentration 2% adhesive solution.

[0063] The above 6g of silicon carbon composite anode material powder, 100g of the above adhesive solution and 2g of carbon black as a conductive material were added to the mixer and mixed to prepare the slurry.

[0064] Pour the prepared slurry on a copper foil collector, coat it with a manual coater and dry it in a convection oven at 110 °C for 2 h. Then, the dried electrodes are pressed with a roller press to complete the negative electrode.

Embodiment 3

[0066] Measurement of porosity

[0067]The battery cell is composed of a negative electrode, a positive electrode and a diaphragm, which is assembled by alternately stacking the negative, positive and diaphragms, which are located between the positive and negative electrodes. When assembling the winding battery, it is repeatedly stacked from the bottom in the order of diaphragm, negative electrode, diaphragm and positive electrode, and the uppermost electrode is positioned with a negative electrode and finally wrapped with a diaphragm. Record the thickness of the negative electrode, recorded as the first thickness;

[0068] The assembled coiled battery is loaded into an aluminum-plastic film bag, hot welded and leaving an electrolyte injection hole, and a force of 200 N is applied to both sides of the wide surface of the battery by a fixture to fix it, and the thickness of the battery is measured.

[0069] The electrolyte is then injected into a bag-shaped battery whose thickness ...

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Abstract

The invention discloses a silicon-carbon composite negative electrode material, a negative electrode and a lithium secondary battery. The silicon-carbon composite negative electrode material comprises a silicon material, amorphous carbon and a conductive carbon material, the surface of the silicon material is coated with a silane binder, the amorphous carbon is bonded with the silane binder, and the amorphous carbon is bonded with the conductive carbon material. A negative electrode prepared from the silicon-carbon composite negative electrode material can keep a constant porosity range, so that the energy density and the cycle life of a battery are improved.

Description

Technical field [0001] The present invention relates to the field of new energy technology, relates to a silicon-carbon composite anode material, anode and lithium secondary battery. Background [0002] In lithium-ion batteries, during charging, lithium ions are released from the positive electrode, moved and stored into the negative electrode, and during discharge, lithium ions return from the negative electrode to the positive electrode, and an electrochemical reaction occurs in the above process. However, graphite, the negative electrode material in traditional lithium-ion batteries, limits the increase in battery energy density due to its low specific capacity. [0003] Silicon material is a negative electrode material with a high specific capacity, can replace the application of graphite in the negative electrode, however, due to the huge volume expansion of silicon in the process of charging and discharging, its cycle life is greatly reduced, and due to the low conductivity...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/587
CPCH01M4/362H01M4/386H01M4/587Y02E60/10
Inventor 崔荣吉马忠龙
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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