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Cellulose-based integrated zinc ion battery and preparation method thereof

A zinc-ion battery, cellulose technology, applied in battery electrodes, secondary batteries, battery pack parts and other directions, can solve the problems of lack of flexibility of products, expensive copper foam, high preparation cost, and solve the problem of high modification cost , excellent flexibility and electrochemical performance, low cost effect

Active Publication Date: 2020-10-16
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In Science 356 (2017) 415-418, Rolison et al. used zinc powder as a raw material to prepare a three-dimensional zinc foam by mold casting and subsequent high-temperature sintering, which showed excellent performance as the negative electrode of alkaline zinc batteries; but The preparation method is relatively complicated, and the product is a solid block without flexibility
In Chemical Engineering Journal 379(2020) 122248, Zhou et al. electroplated zinc onto copper foam with three-dimensional porous structure and achieved excellent cycle stability; however, copper foam is expensive and lacks flexibility
Although the above two strategies greatly increase the contact area between zinc and the electrolyte, and alleviate the uneven distribution of the electric field on the surface of the negative electrode, thereby reducing the nucleation overpotential and slowing down the dendrite growth during zinc deposition; however, The preparation cost is high, and the product lacks flexibility, so it is not suitable for flexible wearable energy storage devices
For zinc-ion batteries, there is still a problem at this stage, that is, the electrodes and the separator are easy to detach and lose effective contact when bending, which will inevitably reduce the performance of the battery.

Method used

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  • Cellulose-based integrated zinc ion battery and preparation method thereof
  • Cellulose-based integrated zinc ion battery and preparation method thereof
  • Cellulose-based integrated zinc ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Disperse 400mg of zinc powder, 50mg of nanocellulose and 50mg of carbon nanotubes in 50mL of deionized water, and disperse evenly;

[0027] (2) Disperse 500mg of micron-sized cellulose in 20mL of deionized water and disperse evenly;

[0028] (3) Disperse 28mg carbon nanotube / manganese dioxide composite positive electrode material, 4mg nanocellulose and 8mg conductive carbon black in 30mL deionized water, and disperse evenly;

[0029] (4) Vacuum filter the dispersion obtained in step (1), step (2) and step (3) in sequence, then freeze-dry and press at 5MPa high pressure, and finally add 2M zinc sulfate + 0.2M manganese sulfate Aqueous electrolyte.

[0030] The integrated zinc ion battery obtained in this embodiment has excellent flexibility. The integrated zinc-ion battery obtained in this embodiment was tested at a voltage range of 1.0-1.85V. The zinc storage rate performance of the resulting zinc-ion battery is as follows: figure 1 shown, at an initial 0.2mA cm...

Embodiment 2

[0032] (1) Disperse 400mg of zinc powder, 50mg of nanocellulose and 50mg of carbon nanotubes in 50mL of deionized water, and disperse evenly;

[0033] (2) Disperse 500mg of micron-sized cellulose in 20mL of deionized water and disperse evenly;

[0034] (3) Vacuum filter the dispersion liquid obtained in step (1) and step (2) according to the positive sequence, then freeze-dry and press at 5MPa high pressure, as an integrated negative electrode and diaphragm, and finally add 2M zinc sulfate + 0.2M Manganese sulfate aqueous electrolyte and assembled with titanium foil coated with carbon nanotube / manganese dioxide composite cathode material.

[0035] The integrated zinc-ion battery obtained in this embodiment was tested at a voltage range of 1.0-1.85V. The zinc storage rate performance of the resulting zinc-ion battery is as follows: figure 2 shown, at an initial 0.2mA cm -2 The discharge specific capacity of the 10th cycle under the current density is 180.4μAh cm -2 ; when ...

Embodiment 3

[0037] (1) Disperse 400mg of zinc powder, 50mg of nanocellulose and 50mg of carbon nanotubes in 50mL of deionized water, and disperse evenly;

[0038] (2) Disperse 250mg of nanocellulose in 80mL of deionized water and disperse evenly;

[0039] (3) Vacuum filter the dispersion liquid obtained in step (1) and step (2) according to the positive sequence, and then freeze-dry it as an integrated negative electrode and diaphragm, and finally add 2M zinc sulfate + 0.2M manganese sulfate for aqueous electrolysis liquid and assembled with titanium foil coated with carbon nanotube / manganese dioxide composite cathode material.

[0040] The integrated zinc-ion battery obtained in this embodiment was tested at a voltage range of 1.0-1.85V. The zinc storage rate performance of the resulting zinc-ion battery is as follows: Figure 4 shown, at an initial 0.2mA cm -2 The discharge specific capacity of the 10th cycle at the current density is 121.1 μAh cm -2 . When the current density incr...

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Abstract

The invention discloses a cellulose-based integrated zinc ion battery and a preparation method thereof. The battery comprises a cellulose-based self-supporting positive electrode or a conductive current collector coated with a positive electrode material, a cellulose-based diaphragm and a cellulose-based self-supporting negative electrode, wherein the positive electrode, the diaphragm and the negative electrode or both the diaphragm and the negative electrode are combined in an integrated manner. According to the battery, zinc dendrites and inert products can be prevented from being generatedon the negative electrode, the electrode is avoided from being separate from the diaphragm when the battery is bent, and the obtained cellulose-based integrated zinc ion battery has excellent flexibility and electrochemical performance.

Description

technical field [0001] The invention relates to a zinc ion battery and a preparation method thereof, in particular to a cellulose-based integrated zinc ion battery and a preparation method thereof. Background technique [0002] Rechargeable zinc-ion batteries using neutral or weakly acidic aqueous electrolytes can be traced back to the Zn / / ZnSO proposed by Yamamoto et al. in 1986. 4 / / MnO 2 system, which is currently considered to be one of the most promising electrochemical energy storage devices for large-scale energy storage systems and flexible wearable electronic devices. First of all, zinc metal has the following advantages: environmental friendliness, safety and non-toxicity, low price, low redox potential, high overpotential for water splitting, high theoretical specific capacity, and good stability in water and air. Secondly, compared with organic electrolytes, aqueous electrolytes have significant advantages such as low cost, high safety, and high ionic conductiv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M4/62H01M4/66H01M10/36H01M10/38
CPCH01M10/36H01M10/38H01M4/668H01M4/628Y02E60/10Y02P70/50
Inventor 陈继章王安冉
Owner NANJING FORESTRY UNIV
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