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Composite modified negative electrode for aqueous metal battery

A negative electrode and zinc-ion battery technology, applied in the direction of battery electrodes, negative electrodes, electrode manufacturing, etc., can solve the problems of local hydroxide concentration increase, accelerated electrolyte consumption, electrode surface passivation, etc., to reduce charge transfer resistance, Effects of inhibiting dendrite growth and reducing polarization voltage

Pending Publication Date: 2022-05-24
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of metal plating and stripping, there are usually the following problems: (1) The uneven deposition of zinc ions will lead to the formation of zinc dendrites, and the accumulation of dendrites will pierce the separator and cause a short circuit, and the increased specific surface area will also cause Accelerate the consumption of electrolyte; (2) Hydrogen evolution reaction occurs, which increases the local hydroxide concentration and forms insoluble substances during charging; (3) By-products attach to the surface of the metal foil to passivate the electrode surface

Method used

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  • Composite modified negative electrode for aqueous metal battery
  • Composite modified negative electrode for aqueous metal battery
  • Composite modified negative electrode for aqueous metal battery

Examples

Experimental program
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Effect test

Embodiment 1

[0033] (1) Dissolve 4 mmol of citric acid, 4 mmol of tetrabutyl titanate, 2 mmol of sodium acetate and 6 mmol of phosphoric acid in 40, 40, 20, and 20 mL of absolute ethanol, respectively, and mix them in sequence after fully stirring them to dissolve. The mixed solution was heated with stirring in an oil bath at 70°C until a white gel formed. The gel was dried at 70°C overnight to obtain a composite precursor.

[0034] (2) The precursor is calcined in a tube furnace (Ar protective gas) to obtain a carbon-coated composite material NTP@C. The calcination conditions were as follows: from room temperature to 350 °C at a heating rate of 2 °C / min, and holding for 4 h; then, the temperature was continuously raised to 700 °C at the same heating rate, and held for 8 h to obtain black powder (NTP@C).

[0035] (3) Mix NTP@C and PVDF in a mass ratio of 9:1, add an appropriate amount of NMP, prepare a coating agent slurry by stirring, and uniformly coat the coating agent slurry on the zi...

Embodiment 2

[0039] In step (2), the calcination condition is to raise the temperature from room temperature to 350°C at a heating rate of 2°C / min, and keep for 4 hours; after that, the temperature is continuously heated to 600°C at the same heating rate, and the temperature is kept for 8 hours to obtain black powder. Others are the same as in Example 1.

Embodiment 3

[0041] The calcination condition in step (2) is to raise the temperature from room temperature to 350°C at a heating rate of 2°C / min, and keep for 4 hours; then, the temperature is continuously heated to 800°C at the same heating rate, and the temperature is kept for 8 hours to obtain black powder. Others are the same as in Example 1.

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Abstract

The invention discloses a composite modified negative electrode for an aqueous metal battery. The preparation method of the negative electrode comprises the following steps: preparing a carbon-coated composite material precursor by a sol-gel method, calcining the precursor in a protective atmosphere to form black powder, finally forming a coating agent by the black powder, a binder and a solvent, and coating the coating agent on a zinc foil to form the modified negative electrode. Through the synergistic effect of the prepared composite modified negative electrode, double-layer metal deposition is realized, and dendritic crystal growth is inhibited; the polarization voltage of the battery is further reduced while conductive carbon is introduced, and long-term stable circulation of the battery is realized.

Description

technical field [0001] The present invention generally relates to an aqueous metal battery, and more particularly, to a modified negative electrode of the battery. Background technique [0002] To address increased environmental pollution and climate change caused by over-reliance on fossil fuels, the demand for clean and sustainable energy has increased rapidly in recent years. Solar energy, wind energy, tidal energy, etc. as renewable energy sources limit their further use due to their inherent intermittency, unpredictability, and dispersion, while electrochemical energy storage is highly competitive due to reliable and manageable energy delivery. Currently, lithium-ion batteries dominate secondary battery applications ranging from portable electronic devices (mobile phones and laptops, etc.) to electric vehicles due to their high energy density and mature manufacturing technology. However, due to the shortage of metal lithium resources, high cost, harsh preparation condi...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/62H01M4/42H01M4/02H01M10/36H01M10/38
CPCH01M4/0402H01M4/02H01M4/42H01M4/628H01M4/625H01M10/36H01M10/38H01M2004/027H01M2004/021Y02E60/10Y02P70/50
Inventor 吴川赵然杨菁菁白莹吴锋
Owner BEIJING INSTITUTE OF TECHNOLOGYGY