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Binder suitable for silicon-based negative electrode material of lithium ion battery, manufacturing method for binder and negative electrode material

A technology for lithium ion batteries and negative electrode materials, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of carboxyl groups and hydroxyl groups affecting dispersibility, poor processing performance, and poor thermodynamic performance of lithium polyacrylate. , to achieve the effect of improving dispersibility, low price, improving mechanical properties and processability

Inactive Publication Date: 2016-07-06
HUZHOU CHUANGYA POWER BATTERY MATERIALS
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Problems solved by technology

[0004] Polyacrylic acid (PAA) is a relatively good binder for silicon-based negative electrode materials, but the carboxyl groups and hydroxyl groups in it are prone to agglomeration and affect its dispersion
After completely neutralizing its carboxyl group to obtain polyacrylic acid lithium (PAA-Li), the binder will be more uniformly dispersed due to the electrostatic repulsion between carboxylate groups, and polyacrylic acid lithium can also enhance the conductivity of lithium ions and electrons, so When used as a silicon-based negative electrode material, the material has better cycle performance, but lithium polyacrylate has poor thermodynamic properties and poor processability

Method used

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  • Binder suitable for silicon-based negative electrode material of lithium ion battery, manufacturing method for binder and negative electrode material

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Embodiment 1

[0026] Weigh 0.70g of silicon nanoparticles, 0.15g of conductive carbon black and PAAH 0.5 -Li 0.5 Add 0.15g into the beaker, measure 3mL of distilled water into the beaker, stir and disperse at 1200rpm. Spread the well-mixed slurry evenly onto the treated Cu foil and dry it. The dried pole pieces were cut into small discs with a diameter of 1 cm, and vacuum-dried at 90° C. for 12 h. The dried pole piece was moved to a glove box, and a lithium piece was used as a counter electrode to assemble a 2032 button cell. The electrolyte is 1MLiPF6 EC / DMC / DEC solution with a conductive salt volume ratio of 1:1:1, and VC with a mass fraction of 2% and FEC with a mass fraction of 10% are added as additives. Seal the assembled battery and let it stand for 10h. Test the electrochemical performance of the static battery on a charge-discharge tester with constant current, set the charge-discharge current to 100mA / g, and the voltage range to 0.01-2V. Determination of the capacity retentio...

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Abstract

The invention relates to a binder, and particularly to a binder suitable for a silicon-based negative electrode material of a lithium ion battery. The invention also relates to a preparation method for the binder and the silicon-based negative electrode material of the lithium ion battery prepared from the binder. The binder suitable for the silicon-based negative electrode material of the lithium ion battery is disclosed, wherein the binder is partially-neutralized polyacrylic acid. By adoption of the partially-neutralized polyacrylic acid provided by the invention, the dispersity of the binder is improved, the mechanical property and machinability of the binder are improved as well, and the electrochemical performance of the material can be further improved.

Description

technical field [0001] The present invention relates to a binder, in particular to a binder suitable for silicon-based negative electrode materials for lithium-ion batteries. The invention also relates to the preparation method of the binder and the lithium ion produced by the binder. Battery silicon anode material. Background technique [0002] Lithium-ion batteries have attracted people's attention due to their high energy density and good cycle performance, and have been developed rapidly in the past 20 years. At present, the negative electrode materials of commercial lithium-ion batteries are mainly various graphite materials, and their theoretical specific capacity is 372mAh / g. However, the current commercial graphite anode material is close to its theoretical specific capacity. To further increase the energy density of lithium-ion batteries, it is necessary to develop new high-capacity lithium-ion battery anode materials. At present, silicon-based anode materials hav...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M10/0525
CPCH01M4/622H01M10/0525Y02E60/10
Inventor 郭挺王双才郭雷胡博
Owner HUZHOU CHUANGYA POWER BATTERY MATERIALS
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