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Chemically coupled silicon-conductive polymer composite electrode with stable interface and preparation method thereof

A conductive polymer, chemical coupling technology, used in battery electrodes, electrochemical generators, circuits, etc., can solve the problems of battery capacity decline, electrode material Coulomb efficiency and cycle stability decline, SEI film damage, etc. SEI resistance, improved interfacial compatibility, high peel force effect

Inactive Publication Date: 2020-11-10
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of volume expansion of the silicon material used as an electrode material that causes SEI film damage and repeated generation, resulting in the irreversible consumption of electrolyte and lithium ions, resulting in a decrease in the Coulombic efficiency and cycle stability of the electrode material, causing battery To solve the problem of sudden drop in capacity, provide a chemically coupled silicon-conductive polymer composite electrode with stable interface to inhibit the repeated generation of SEI film and the continuous consumption of electrolyte, and improve the cycle stability and high rate performance of the battery

Method used

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  • Chemically coupled silicon-conductive polymer composite electrode with stable interface and preparation method thereof
  • Chemically coupled silicon-conductive polymer composite electrode with stable interface and preparation method thereof
  • Chemically coupled silicon-conductive polymer composite electrode with stable interface and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Mix 80mg nano silicon powder, 20mg (1.428mL 1.4wt% aqueous solution) PEDOT:PSS and 10mg silane coupling agent GOPS (Chinese name is γ-glycidoxypropyl) trimethoxysilane) into a uniform slurry material. After stirring for 6 hours, the slurry was uniformly scraped on the surface of the copper foil with a wet film preparation device, and placed in a vacuum oven at 80°C to dry overnight. The dried pole piece is punched into a disc with a diameter of 12mm with a disc machine. Put the punched disc in a vacuum drying oven at 180°C for 60 minutes to conduct a full cross-linking reaction. The obtained electrode sheet is recorded as the SGP-10-180-60 electrode.

[0040] For comparison, we used the same method to prepare electrode pads with 5 mg and 20 mg of GOPS added, which were denoted as SGP-5-180-60 electrode and SGP-20-180-60 electrode, respectively.

[0041] Among them, SGP means silane coupling agent cross-linked PEDOT:PSS-silicon anode, the first number represents the amount ...

Embodiment 2

[0058] Mix and stir 80 mg nano silicon powder, 20 mg PEDOT:PSS and 5 mg GOPS into a uniform slurry. After stirring for 6 hours, the slurry was evenly scraped on the surface of the copper foil, and placed in a vacuum oven at 80°C to dry overnight.

[0059] According to the method of Example 1, the electrode sheet was made, except that the amount of GOPS used was reduced to 5 mg. Example 2 The obtained sample was subjected to a constant current charge and discharge test. At a current density of 200mA / g, the reversible specific capacity and specific capacity retention rate of the SGP-5-180-60 electrode were 1511.4mAhg after 200 cycles of cycles. -1 And 54.4%.

Embodiment 3

[0061] Mix and stir 80 mg nano silicon powder, 20 mg PEDOT:PSS and 20 mg GOPS into a uniform slurry. After stirring for 6 hours, the slurry was evenly scraped on the surface of the copper foil, and placed in a vacuum oven at 80°C to dry overnight.

[0062] According to the method of Example 1, the electrode sheet was produced, except that the amount of GOPS used was 20 mg. Example 3 The obtained sample was subjected to a constant current charge and discharge test. At a current density of 200mA / g, the reversible specific capacity and the specific capacity retention rate of the SGP-20-180-60 electrode were 841.2mAhg after cycling for 200 cycles. -1 And 31.2%.

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Abstract

The invention relates to a chemically coupled silicon conductive polymer composite electrode with a stable interface and a preparation method thereof. The composite electrode comprises an electrode slice, the electrode slice is coated with a cross-linked conductive polymer binder silicon electrode, and the cross-linked conductive polymer binder silicon electrode is composed of the following raw materials: a silicon active material, PEDOT: PSS and a silane coupling agent. The introduction of the silane coupling agent improves the interfacial compatibility between the non-hydrophilic silicon material and the conductive polymer aqueous solution, so the uniform slurry is formed more easily, the high-performance electrode is prepared from simple raw materials, the method is simple, the design is ingenious, and the cost is low. The prepared cross-linked conductive polymer binder electrode has good rate capability and long cycle stability, and has a very high practical application prospect.

Description

Technical field [0001] The invention relates to the technical field of batteries, in particular to a chemically coupled silicon-conductive polymer composite electrode with stable interface and a preparation method thereof. Background technique [0002] Silicon material has been studied for decades due to its high theoretical lithium storage capacity (4200mAh g-1). However, since the volume change of silicon in the process of deintercalating lithium is higher than 300%, it will cause the active material to be powdered and fall off from the current collector, so the specific capacity of the silicon negative electrode will attenuate during the cycle. In response to this problem, researchers have developed nano-silicon materials, such as nanoparticles, nanowires, core-shell structures and porous structures. At present, nano-silicon has achieved industrial production, and the cost of materials has been reduced a lot. The application of nano-silicon materials greatly improves the cyc...

Claims

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Application Information

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IPC IPC(8): H01M4/134H01M4/1395H01M4/38H01M4/62H01M10/42
CPCH01M4/134H01M4/1395H01M4/386H01M4/621H01M4/624H01M10/4235Y02E60/10
Inventor 宰建陶刘雪娇钱雪峰戚嵘嵘田恒陈明张寓弛闫昶宇李文倩
Owner SHANGHAI JIAO TONG UNIV