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Method for activating ferricyanide and zinc ion battery prepared therefrom

A zinc-ion battery and iron ferricyanide technology, applied in battery electrodes, secondary batteries, electrolyte immobilization/gelation, etc., can solve low rate performance, specific capacity blocking PBA-cathode, rate performance capacity reduction, etc. problems, to achieve the effects of high ionic conductivity, excellent antifreeze function, and excellent cycle stability

Active Publication Date: 2021-11-02
香港城市大学深圳研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these PBA-type cathodes, such as cyanoferric hexacyanoferrate (FeHCF), suffer from short lifetime, low rate capability, and low operating voltage.
Significant specific capacity decay within short lifetime ≤ 1000 cycles prevents practical application of PBA-cathode
In addition, compared with the initial current density, at a current density of about 1A g -1 When the rate capability (rate capability) even experienced a severe capacity reduction of up to 50%
The insufficient lifetime and lower rate performance are attributed to the limited utilization of redox-active sites (Fe(III / II)), which is caused by the close-fitting effect exerted by six cyano groups per unit

Method used

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  • Method for activating ferricyanide and zinc ion battery prepared therefrom
  • Method for activating ferricyanide and zinc ion battery prepared therefrom
  • Method for activating ferricyanide and zinc ion battery prepared therefrom

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] This embodiment provides an antifreeze gel electrolyte, which is prepared through the following steps:

[0044] 1) Prepare 15mL 21M high-concentration bistrifluoromethanesulfonimide zinc-lithium electrolyte;

[0045] 2) Add 3 g of acrylamide to the high-concentration bistrifluoromethanesulfonimide zinc-lithium electrolyte, and stir at room temperature for 30 minutes;

[0046] 3) After adding 0.5 mg ammonium persulfate and 0.2 mg dimethylacrylamide, stir at room temperature for 30 min;

[0047] 4) Inject the product of step 3) into an ordinary glass mold, and place it in an oven at 70°C for 2 hours of polymerization;

[0048] 5) Remove the mold to obtain the final antifreeze gel electrolyte.

[0049] The present embodiment provides a kind of activation method of ferricyanide, it may further comprise the steps:

[0050] (1) The newly assembled Zn-FeHCF battery was left to stand at room temperature for 1 hour, wherein the electrolyte was the antifreeze gel electrolyte p...

Embodiment 2

[0056] The present embodiment provides a kind of activation method of ferricyanide, it may further comprise the steps:

[0057] (1) The newly assembled Zn-FeHCF battery was left to stand at room temperature for 1 hour, and the electrolyte was the antifreeze gel electrolyte prepared in Example 1;

[0058] (2) After standing still, perform a high-voltage scan on the Zn-FeHCF battery on the blue electric battery test system, and the current density is 2A g -1 , the voltage upper limit is 2.3V;

[0059] (3) After the high-voltage scan, the Zn-FeHCF battery is placed on the blue electric battery test system, and the standing time is 1s;

[0060] (4) After the program was left standing, the Zn-FeHCF battery was discharged on the blue electric battery test system, and the current density was 1A g -1 , the lower limit of the voltage is 0.01V; the battery completes a high-voltage scanning cycle after programmed discharge, and continues for 260 cycles to complete the activation and ob...

Embodiment 3

[0063] The present embodiment provides a kind of activation method of ferricyanide, it may further comprise the steps:

[0064] (1) The newly assembled Zn-FeHCF battery was left to stand at room temperature for 1 hour, and the electrolyte was the antifreeze gel electrolyte prepared in Example 1;

[0065] (2) After standing still, perform a high-voltage scan on the Zn-FeHCF battery on the blue electric battery test system, and the current density is 1A g -1 , the voltage upper limit is 2.3V;

[0066] (3) After the high-voltage scan, the Zn-FeHCF battery is placed on the blue electric battery test system, and the standing time is 5s;

[0067] (4) After the program was left standing, the Zn-FeHCF battery was discharged on the blue electric battery test system, and the current density was 1A g -1 , the lower limit of the voltage is 0.01V; the battery completes a high-voltage scanning cycle after programmed discharge, and continues for 500 cycles to complete the activation and ob...

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Abstract

The invention provides a method for activating ferricyanide and a zinc ion battery prepared thereby. The method comprises the following steps: carrying out high-voltage scanning to the Zn-FeHCF battery; after the high-voltage scanning, carrying out program static to the Zn-FeHCF battery; after the program static, carrying out program discharge to the Zn-FeHCF battery; After discharging, a high-voltage scanning cycle is completed, and 100-1000 cycles are continued to complete the activation. The invention also provides a zinc ion battery using the ferric ferricyanide activated by the above method as a cathode. An electrochemically more stable structure is produced by the activation method of the present invention, so that the Zn-FeHCF battery can achieve a record-breaking cycle performance of higher capacity retention after an ultra-long cycle.

Description

technical field [0001] The invention relates to a method for activating ferricyanide and a zinc ion battery prepared therefrom, belonging to the technical field of batteries. Background technique [0002] Zinc ion batteries (Zinc ion batteries, ZIBs), which store divalent zinc ions in the cathode body, are being intensively studied due to the high energy density and inherent safety of metallic zinc anodes. Zinc has a suitable plating / stripping voltage (approximately -0.76V vs SHE) and is electrochemically stable in water, which enables ZIBs to escape the use of toxic organic electrolytes and complex assembly in glove boxes compared to their lithium and sodium counterparts process. This advantage of the zinc anode has led researchers to pay more attention to the development of cathode host materials. Among these materials, MnO with various crystalline phases has been developed 2 Based on the cathode, the Mn(IV) / Mn(III)-based single-electron transfer reaction provides high ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M10/36
CPCH01M4/5825H01M10/36H01M2300/0085Y02E60/10
Inventor 支春义杨琪唐子杰梁国进
Owner 香港城市大学深圳研究院
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