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Silk fibroin coating modified zinc anode, preparation method and application thereof

A silk fibroin, zinc anode technology, applied in electrode manufacturing, battery electrodes, active material electrodes, etc., can solve problems such as anode instability

Pending Publication Date: 2022-07-22
JILIN 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 provide a zinc metal anode modified by silk fibroin coating, a preparation method and its application. The modified zinc metal anode provided by the present invention aims to solve the problem of anode instability and extreme Overheating problem, thereby improving the rate performance and cycle stability of the battery, and prolonging the service life of the battery

Method used

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  • Silk fibroin coating modified zinc anode, preparation method and application thereof
  • Silk fibroin coating modified zinc anode, preparation method and application thereof
  • Silk fibroin coating modified zinc anode, preparation method and application thereof

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Embodiment 1

[0024] Preparation of silk fibroin-coated zinc anode: First, silk fibroin was prepared. Cut silkworm cocoons (5g) into small pieces, put in 50ml, 0.02M Na 2 CO 3 Boil in aqueous solution for 35 minutes, rinse thoroughly with distilled water, and dry in air at room temperature. Subsequently, 0.4 g of anhydrous calcium chloride was dissolved in 15 ml of anhydrous formic acid (HCOOH) to obtain a uniform and transparent solution, and then 0.8 g of dried silk fibroin was added to the above solution under vigorous stirring until completely dissolved. The surface of the zinc foil was polished with sandpaper, then washed with deionized water and ethanol. After drying at room temperature, the silk fibroin mixed solution was coated on the zinc foil with a spatula with a thickness of 6 μm. After overnight drying, a solid was prepared. For silk fibroin coating, the dried coating was soaked in water to induce the formation of β-sheets and pores, thereby preparing a silk fibroin-coated zi...

Embodiment 2

[0027] Preparation of Zn / / Zn (Zn-SF / / Zn-SF) symmetrical cells: The symmetrical cells were fabricated by using two pure Zn electrodes (or two Zn- SF electrodes were assembled as cathode and anode, respectively. 2M ZnSO 4 Aqueous solution and glass fiber separator (GF / C, Whatman) were used as electrolyte and separator, respectively, and the volume of electrolyte added was 200 μl.

[0028] Zn(Zn-SF)-Zn x V 2 O 5 ·nH 2 Preparation of O full cells: Zn x V 2 O 5 ·nH 2 O powder, acetylene black, and polytetrafluoroethylene (PTFE) were mixed in a mass ratio of 7:2:1 to prepare a self-supporting film, which was pressed onto a stainless steel mesh and cut into pieces (1x1 cm) after being vacuum-dried at room temperature 2 ) as the cathode. The mass load was measured to be 2 mg cm -2 . The cathode was assembled in a CR2025 coin cell with pure Zn or Zn-SF as anode, glass fiber separator (GF / C, Whatman) and 2M ZnSO 4 (200 μL) was used as separator and electrolyte.

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Abstract

The invention discloses a zinc anode modified by a silk fibroin coating as well as a preparation method and application thereof, and belongs to the technical field of energy materials. The preparation method comprises the following steps: firstly, preparing a zinc anode (Zn-SF) coated with silk fibroin, then preparing a ZnxV2O5.nH2O cathode material, assembling the cathode in a CR2025 button cell, and assembling by taking the Zn-SF as the anode, a glass fiber diaphragm and 2M ZnSO4 as a diaphragm and electrolyte to obtain the (Zn-SF)-ZnxV2O5.nH2O total cell. The zinc anode modified by the SF coating provides high rate capability and longer cycle stability, the total battery combined with the ZnxV2O5.nH2O cathode provides a method for constructing the zinc anode on an interface, the zinc anode is used for a high-rate aqueous zinc ion battery, the electrochemical performance of the battery is improved, and the cycle life of the battery is prolonged.

Description

technical field [0001] The invention belongs to the technical field of energy materials, and in particular relates to a zinc anode modified by a silk fibroin coating, a preparation method and an application thereof. Background technique [0002] Aqueous zinc-ion batteries hold great potential in large-scale energy storage systems due to their high theoretical capacity, low redox potential, and natural abundance. However, as an important part of batteries, zinc anodes always suffer from serious problems, such as dendrite growth, hydrogen evolution reaction, and by-product generation, which greatly reduce their cycle life and cause safety concerns. Therefore, to obtain stable zinc anodes, researchers have proposed many methods, including anode structure tuning (3D current collectors or alloys), electrolyte optimization (additives / high-concentration salts), and surface protective coatings. The anode structure tuning strategy enlarges the specific surface area and greatly reduc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/02H01M4/04H01M4/38H01M10/36
CPCH01M4/628H01M4/02H01M4/0409H01M10/36H01M4/38H01M2004/027
Inventor 贾晓腾晁单明卢革宇赵力
Owner JILIN UNIV
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