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Electrode plate and preparation method and use thereof

A technology of electrode pole piece and negative pole piece, applied in the direction of negative electrode, battery electrode, active material electrode, etc., can solve the problems of poor long-term cycle performance and structural damage of silicon-carbon negative electrode materials, so as to improve cycle performance, reduce damage, The effect of preventing co-embedding

Inactive Publication Date: 2020-01-24
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the long-term cycle performance of the silicon-carbon negative electrode material is poor, and its structure is damaged by repeated charging and discharging.

Method used

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  • Electrode plate and preparation method and use thereof
  • Electrode plate and preparation method and use thereof
  • Electrode plate and preparation method and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] (1) Mix silicon carbon negative electrode material silicon carbon 650, aqueous binder sodium hydroxymethyl cellulose (CMC), styrene-butadiene rubber (SBR) and conductive agent (super P) according to the mass ratio of 8:0.5:0.5:1 Grind evenly, add water and place it on a magnetic stirrer to fully stir for 8 hours, coat it on copper foil, and then place it in a vacuum drying oven at 80°C to dry for later use to obtain a silicon carbon negative pole piece;

[0059] (2) Dissolve tris (Tris) in distilled water, add hydrochloric acid to adjust the pH to make 500mL Tris buffer (pH 8.5), add dopamine to dissolve, the concentration is 2.0g / L, then add oxidant persulfuric acid Ammonium, a reaction system is prepared, the concentration of ammonium persulfate in the reaction system is 20mmol / L, and the concentration of tris is 10mmol / L;

[0060] (3) Soak the dried silicon-carbon negative electrode sheet into the reaction system at 36°C, control the self-polymerization reaction time...

Embodiment 2

[0062] The difference from Example 1 is that the self-polymerization reaction time of step (3) is 40min.

Embodiment 3

[0064] The difference from Example 1 is that the self-polymerization reaction time of step (3) is 60min.

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Abstract

The invention relates to a preparation method of an electrode plate, which comprises the following steps: (1) dissolving dopamine in a buffer solution, and adding an oxidant to obtain a reaction system; and (2) infiltrating a reaction plate into the reaction system to obtain an electrode plate. According to the invention, a multifunctional group on dopamine is introduced to the electrode plate, and in the charging and discharging process, the multi-electron amido attached to the surface of the electrode plate can promote the reduction of electrolyte and additives in the electrolyte solution and promote the formation of a stable SEI film on the surface of the electrode. On one hand, the electrolyte solution can be separated from the electrode as soon as possible, and the contact is reduced;and on the other hand, co-intercalation of solvent molecules can be prevented, and damage to the structure of the electrode material can be reduced in the two aspects. Therefore, generation of irreversible capacity is reduced, the cycle performance of the electrode is improved, and breaking and smashing of the electrode plate caused by volume expansion in the charging and discharging process arereduced.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to an electrode pole piece, a preparation method and application thereof. Background technique [0002] With the massive consumption of fossil fuels, environmental problems are becoming more and more severe, and it is imminent to develop new energy sources to replace traditional fossil fuels. Lithium-ion batteries (LIBs) have been widely used in portable electronic devices (such as mobile phones, laptops, and cameras), but with the development of electric vehicles (EVs) and energy storage systems (ESSs), the demands on the capacity and performance of batteries are increasing. The development of high-energy, environment-friendly green power sources is becoming increasingly urgent. [0003] Silicon has an ultra-high theoretical intercalation capacity of about 4200mAh / g, which is more than ten times the ultimate specific capacity of commercial graphite anodes, and the el...

Claims

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Application Information

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IPC IPC(8): H01M4/1393H01M4/1395H01M4/133H01M4/134H01M4/62H01M4/38H01M4/587H01M10/0525H01M10/054
CPCH01M4/133H01M4/134H01M4/1393H01M4/1395H01M4/386H01M4/587H01M4/628H01M10/0525H01M10/054H01M2004/027Y02E60/10
Inventor 陈仕谋王如梦王晓阳刘玉文张锁江
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI