Zinc negative electrode material of zinc air cell and preparation method for zinc negative electrode material

A zinc-air battery and zinc negative electrode technology, which is applied to battery electrodes, fuel cell-type half-cells, secondary battery-type half-cells, circuits, etc., can solve the problem of electrode porosity and reaction specific surface area reduction, and can not solve the problem of zinc The problem of densification of powder electrodes, improvement of battery discharge capacity and rate performance, etc., achieve high hydrophilicity and insulation, increase liquid storage rate and water delivery performance, and improve discharge capacity.

Inactive Publication Date: 2017-03-22
CENT SOUTH UNIV
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  • Abstract
  • Description
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Problems solved by technology

[0004] However, ordinary conductive additives, whether zero-dimensional or one-dimensional or other shapes, cannot solve the problem of densification of the zinc powder electrode caused by the redistribution of active materials in the zinc anode. With the repeated charging and discharging of the battery, The porosity of the electrode and the specific surface area of ​​the reaction decrease rapidly, and the H involved in the electrochemical reaction 2 O and OH - As a result, the ion diffusion channel is blocked, which eventually leads to the improvement of the discharge capacity and rate performance of the battery and cannot be maintained, and the cycle life of the battery is low.

Method used

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  • Zinc negative electrode material of zinc air cell and preparation method for zinc negative electrode material

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Experimental program
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Effect test

Embodiment 1

[0032] Bifunctional additive: inner diameter 50nm, titanium dioxide layer thickness 8nm, bismuth oxide layer thickness 100nm, length 45μm.

[0033] Percentage by weight: metal zinc powder 5%, zinc oxide powder 80%, bifunctional additive 7%, conductive carbon black 5%, polytetrafluoroethylene 3%.

[0034] Preparation of zinc anode material: Prepare 10 mL of absolute ethanol, add 4d polytetrafluoroethylene 60% suspension, and stir magnetically for 20 min. Weigh a certain amount of metal zinc powder, zinc oxide powder, bifunctional additives, and conductive carbon black according to the above ratio, and add them to the ethanol solution containing polytetrafluoroethylene in sequence, and then continue to stir for 30 minutes. Continue to stir the dispersed solution at a stirring speed of 600 rpm, and set the evaporation temperature of the dispersant at 60° C., and obtain the negative electrode slurry after 10 minutes.

[0035] The slurry was evenly coated on a 2cm×2cm brass mesh, ...

Embodiment 2

[0038] Bifunctional additive A: inner diameter 50nm, titanium dioxide layer thickness 12nm, chromium oxide layer thickness 200nm, length 23μm;

[0039] Bifunctional additive B: inner diameter 50nm, titanium dioxide layer thickness 10nm, lead dioxide layer thickness 180nm, length 23μm.

[0040] Percentage by weight: 10% of metal zinc powder, 76% of zinc oxide powder, 2% of bifunctional additive A, 2% of bifunctional additive B, 5% of conductive carbon black, and 5% of polyvinyl alcohol.

[0041] Preparation of zinc anode material: Prepare 15 mL of acetone, add 0.0588 g of polyvinyl alcohol, and stir magnetically for 30 min. Weigh a certain amount of metal zinc powder, zinc oxide powder, bifunctional additives A and B, and conductive carbon black according to the above ratio, and add them to the acetone solution containing polyvinyl alcohol in sequence, and then continue to stir for 30 minutes. Continue to stir the dispersed solution at a stirring speed of 2000 rpm, and set the...

Embodiment 3

[0045] Bifunctional additive: inner diameter 100nm, titanium dioxide layer thickness 4nm, bismuth oxide layer thickness 300nm, length 14μm.

[0046] Percentage by weight: 10% of metal zinc powder, 78% of zinc oxide powder, 2% of bifunctional additive, 5% of acetylene black, and 5% of polytetrafluoroethylene.

[0047] Preparation of zinc anode material: prepare 13 mL of deionized water, add 3d polytetrafluoroethylene 60% suspension, and stir magnetically for 30 min. Weigh a certain amount of metal zinc powder, zinc oxide powder, bifunctional additives, and acetylene black according to the above ratio, and add them to the dispersion containing polytetrafluoroethylene in sequence, and then continue to stir for 30 minutes. Continue to stir the dispersed solution at a stirring speed of 2000 rpm, and set the evaporation temperature of the dispersant to 75° C., and obtain the negative electrode slurry after 21 minutes.

[0048] The slurry was uniformly coated on a 2cm×2cm brass mesh...

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Abstract

The invention discloses a zinc negative electrode material of a zinc air cell and a preparation method for the zinc negative electrode material. The negative electrode material comprises metal zinc powder, zinc oxide powder, a binder, and a dual-functional additive with a one-dimensional tubular structure and formed by dual-layer metal oxide; the preparation method comprises the steps of adding the metal zinc powder, the zinc oxide powder, a conductive agent and the dual-functional additive into a binder-containing solution, performing ultrasonic dispersion processing, and heating and evaporating a solvent while stirring to obtain the zinc negative electrode material. The zinc negative electrode material is added with the dual-functional additive which can lower electrode internal resistance as well as supply a diffusion channel for an electrolyte, so that the discharging capacity and the rate capability of the cell can be improved; and meanwhile, a titanium dioxide inner layer has super-hydrophilic property and insulativity, so that the water delivery property of the electrolyte diffusion channel is forcefully enlarged, channel blocking is prevented, and the cycling life and the capacity stability of the cell are effectively prolonged and improved.

Description

technical field [0001] The invention relates to a zinc negative electrode material and a preparation method thereof, in particular to a zinc negative electrode material used in an alkaline zinc-air secondary battery, which belongs to the field of air batteries. Background technique [0002] The alkaline zinc-air secondary battery has the advantages of high capacity, high open circuit voltage, low cost of raw materials, environmental friendliness and safety, and is a green, high-energy and environment-friendly secondary battery. However, zinc-air secondary batteries are susceptible to the densification of the zinc negative electrode, the passivation during the discharge process, and the deformation and dendrite growth during the charge process, resulting in low discharge capacity of the battery, rapid capacity decay during discharge, and unstable capacity. As a result, its application has been greatly restricted. [0003] Zinc oxide, as the oxidation product of the negative ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M12/08
CPCH01M4/62H01M4/626H01M12/08Y02E60/10
Inventor 田忠良张志剑杨超张红亮郭伟昌杨凯
Owner CENT SOUTH UNIV
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