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Self-healing binder for silicon-based negative electrode material for lithium battery, silicon-based negative electrode material for lithium battery, preparation method of silicon-based negative electrode material, negative electrode of battery and lithium battery

A silicon-based negative electrode material and lithium battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as internal structure damage and battery loss of function, and achieve good cycle performance and high initial Coulombic efficiency.

Inactive Publication Date: 2018-02-09
ASIA CUANON TECH SHANGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Based on the self-healing properties, this type of hydrogel can also exhibit excellent properties in lithium-ion batteries, because the internal structure of lithium batteries also suffers from certain mechanical damage during the charge-discharge cycle, and eventually cause the battery to lose its original function

Method used

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  • Self-healing binder for silicon-based negative electrode material for lithium battery, silicon-based negative electrode material for lithium battery, preparation method of silicon-based negative electrode material, negative electrode of battery and lithium battery

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[0037] Still other embodiments of the present invention provide a method for preparing a silicon-based negative electrode material for a lithium battery described in the above embodiments, comprising the following steps:

[0038] Step 101: preparing an aqueous polyacrylic acid solution with a concentration of 45-55 mg / ml;

[0039] Step 102: Prepare an aqueous ferric chloride solution with a concentration of 5-15 mg / ml;

[0040] Step 103: Weigh the silicon-based material and conductive carbon black, put them into a container together with the above-mentioned ferric chloride aqueous solution and polyacrylic acid aqueous solution, stir and mix thoroughly to form a gel-like mixture, and prepare the silicon-based negative electrode material for lithium batteries.

[0041] In this preparation method, polyacrylic acid and Fe in the above binder are first 3+ Prepared into an aqueous solution, and then at room temperature, polyacrylic acid aqueous solution and Fe 3+ The aqueous solut...

Embodiment 1

[0047] Prepare polyacrylic acid (PAA, Aladdin) aqueous solution 50mg / mL;

[0048] Preparation of ferric chloride (FeCl 3 , Aladdin) aqueous solution 10mg / mL;

[0049] Weigh 18mg of 1-5μm silicon powder, 6mg of Super-P conductive carbon black, FeCl 3 Add 14 μL of aqueous solution (2mol% vs acrylic acid) and 120 μL of PAA aqueous solution into an agate mortar, and stir well for 1 hour. Spread this gel-like mixture evenly on the treated Cu foil (150mm*100mm*9μm), dry it at room temperature for 2h, then place it in a vacuum oven, and dry it at 60°C for 12h. Cut the dried pole piece into a 7mm square. After weighing and calculating the mass of the active material on a single pole piece, vacuum dry at 60°C for 2 hours. 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 1M lithium hexafluorophosphate (LiPF 6 , Aladdin) is a ethylene carbonate / dimethyl carbonate (EC / DMC, Aladdin) s...

Embodiment 2

[0051] Prepare polyacrylic acid (PAA, Aladdin) aqueous solution 50mg / mL;

[0052] Preparation of ferric chloride (FeCl 3 , Aladdin) aqueous solution 10mg / mL;

[0053] Weigh 18mg of 1-5μm silicon powder, 6mg of Super-P conductive carbon black, FeCl 3 Add 7 μL of aqueous solution (1 mol% vs acrylic acid) and 120 μL of PAA aqueous solution into an agate mortar, and stir well for 1 hour. Spread this gel-like mixture evenly on the treated Cu foil (150mm*100mm*9μm), dry it at room temperature for 2h, then place it in a vacuum oven, and dry it at 60°C for 12h. Cut the dried pole piece into a 7mm square. After weighing and calculating the mass of the active material on a single pole piece, vacuum dry at 60°C for 2 hours. 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 1M lithium hexafluorophosphate (LiPF 6 , Aladdin) is a ethylene carbonate / dimethyl carbonate (EC / DMC, Aladdin) s...

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Abstract

The invention provides a self-healing binder for a silicon-based negative electrode material for a lithium battery, the silicon-based negative electrode material for the lithium battery, a preparationmethod of the silicon-based negative electrode material, a negative electrode of the battery and the lithium battery. The double-crosslinking self-healing binder comprises a polysaccharide polymer containing a polar group or a synthetic polymer containing the polar group and metal ions, preferably polyacrylic acid (PAA) and Fe<3+> ions. The binder comprises a network structure built through esterification crosslinking of the PAA, and meanwhile, secondary crosslinking is achieved through interaction between ions of the Fe<3+> and the PAA; the PAA is induced through the Fe<3+> to form a self-healing hydrogel system; the self-healing binder can play a double-crosslinking role in the silicon negative electrode material and can play a repairing role in mechanical damage of the electrode in thecharge-discharge cycle process; the energy consumption is extremely low, and meanwhile, the adverse effects of repeated volume changes of the silicon negative electrode in the charging and discharging processes of the battery are avoided; the cycle performance of the silicon-based negative electrode material is improved; the capacity attenuation of the battery is small; and the defects of the prior art are overcome.

Description

technical field [0001] The present invention relates to the technical field of lithium batteries, more specifically, to a double-crosslinked self-healing binder for silicon-based negative electrode materials for lithium batteries, a silicon-based negative electrode material for lithium batteries containing the binder, and a preparation method thereof. And a battery negative electrode and a lithium battery made of the lithium battery silicon-based negative electrode material. Background technique [0002] In the rapidly developing industrial field, as people's demand for energy storage continues to increase, lithium-ion batteries need to carry greater energy density and exhibit more excellent electrochemical performance. Although the traditional graphite anode material has excellent safety performance, its theoretical specific capacity (370 mAh / g) is too low, which has been hampering the development of lithium-ion batteries. Silicon anode has the advantages of ultra-high the...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/36H01M4/38H01M10/0525H01M4/134
CPCH01M4/134H01M4/364H01M4/386H01M4/622H01M4/628H01M10/0525Y02E60/10
Inventor 许军李驰麟张正河徐志新李金钟
Owner ASIA CUANON TECH SHANGHAI
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