Double crosslinking binder for silicon-based negative electrode material for lithium battery, silicon-based negative electrode material for lithium battery, preparation method, negative electrode of battery and lithium battery

A silicon-based negative electrode material, double cross-linking technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, secondary batteries, etc., can solve the problems of unstable ester bonds, high energy consumption, battery capacity attenuation, etc.

Inactive Publication Date: 2018-01-19
ASIA CUANON TECH SHANGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, its cross-linking structure is obtained by inducing esterification reaction under high temperature, and the conditions for realizing cross-linking are high energy consumption; at the same time, with the change of environmental conditions, this type of ester bond is not stable, that is, this type of The cross-linked network structure obtained by the esterification reaction will show instability with the change of external environmental conditions; moreover, the degree of cross-linking cannot be quantitatively controlled
Unable to completely solve the adverse effects of repeated volume changes of the silicon negative electrode during charging and discharging, resulting in serious battery capacity attenuation

Method used

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

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[0032] 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:

[0033] Step 101: preparing polyacrylic acid in N,N-dimethylformamide solution with a concentration of 45-55 mg / ml;

[0034] Step 102: Prepare a N,N-dimethylformamide solution of hexamethylene diisocyanate at a concentration of 15-55 mg / ml;

[0035] Step 103: Weigh the silicon-based material and conductive carbon black, put them into the container together with the N,N-dimethylformamide solution of polyacrylic acid, stir and mix well, and then add the N,N, The N-dimethylformamide solution is continuously stirred to form a uniformly mixed slurry to obtain the silicon-based negative electrode material for lithium batteries.

[0036] In this preparation method, the polyacrylic acid and diisocyanate in the binder given in the above examples are first configured ...

Embodiment 1

[0042] Prepare PAA / N,N-dimethylformamide solution (DMF) at a concentration of 50 mg / mL.

[0043] Prepare a hexamethylene diisocyanate (HDI) / N,N-dimethylformamide solution with a concentration of 50 mg / mL.

[0044] Weigh 18 mg of silicon powder 1-5 μm, 6 mg of Super-P conductive carbon black, and 120 μL of PAA / DMF into an agate mortar, stir well for 1 hour, then add HDI / DMF (6 μL, 2mol% vs acrylic acid) dropwise, continue Stir for 0.5h. Spread the uniformly mixed slurry evenly on the treated Cu foil (150mm*100mm*9μm), dry at room temperature for 2h, and then place it in a vacuum oven and dry 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 1.3M lithium hexafluorophosphate (Aladdin, LiPF 6 ) is an ...

Embodiment 2

[0046] Prepare PAA / N,N-dimethylformamide solution (DMF) at a concentration of 50 mg / mL.

[0047] Prepare a hexamethylene diisocyanate (HDI) / N,N-dimethylformamide solution with a concentration of 50 mg / mL.

[0048] Weigh 18 mg of silicon powder 1-5 μm, 6 mg of Super-P conductive carbon black, and 120 μL of PAA / DMF into an agate mortar, stir and mix well for 1 hour, then add HDI / DMF (15 μL, 5mol% vs acrylic acid base) dropwise, continue Stir for 0.5h. Spread the uniformly mixed slurry evenly on the treated Cu foil (150mm*100mm*9μm), dry at room temperature for 2h, then place in a vacuum oven, and dry 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 1.3M lithium hexafluorophosphate (Aladdin, LiPF 6 ...

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Abstract

The invention provides a double crosslinking binder for a silicon-based negative electrode material for a lithium battery, a silicon-based negative electrode material for the lithium battery, a preparation method, a negative electrode of the battery and the lithium battery. The double crosslinking binder comprises polyacrylic acid and diisocyanate. According to the double crosslinking binder, polycondensation reaction of the diisocyanate and carboxyl of the polyacrylic acid is achieved under a room-temperature condition through adding the diisocyanate, and the double crosslinking binder playsa further stabilizing role on a polymer binder, formed by the polyacrylic acid, with a network structure, thereby achieving double crosslinking; the double crosslinking binder is extremely low in consumed energy; and meanwhile, the adverse effect, caused by repeated volume change, of the silicon negative electrode in charging and discharging processes of the battery is 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 invention relates to the technical field of lithium batteries, more specifically, to a double-crosslinked binder for silicon-based negative electrode materials for lithium batteries, a silicon-based negative electrode material for lithium batteries and a preparation method thereof, and the use of the silicon-based negative electrode material for lithium batteries Made of battery negative electrode and lithium battery. 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 theoretical specific capacity (420...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/62H01M10/0525
CPCY02E60/10
Inventor 许军李驰麟张正河徐志新李金钟
Owner ASIA CUANON TECH SHANGHAI
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