Zinc ion battery and preparation method thereof

A zinc-ion battery and zinc foil technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as short circuit, capacity attenuation, ZIBs life does not reach acceptable standards, etc., and achieve good cycle performance and high conductivity , the effect of inhibiting the growth of dendrites

Pending Publication Date: 2021-06-29
SHAOYANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the practical performance of Zn anodes in neutral electrolytes is severely limited due to obvious disadvantages such as dendrite growth, self-discharge issues, and side reactions.
Specifically, continuous dendrite growth causes short circuits by piercing the separator, leading to rapid capacity fading
As a result, the current lifetime of ZIBs is far from acceptable

Method used

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  • Zinc ion battery and preparation method thereof
  • Zinc ion battery and preparation method thereof
  • Zinc ion battery and preparation method thereof

Examples

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Embodiment 1

[0032] A zinc-ion battery, including a positive electrode, a separator, a negative electrode and an aqueous electrolyte, the positive electrode includes zinc foil and a positive electrode active material, the positive electrode active material is PEDOT:PSS / graphene layer, and the thickness of the positive electrode active material is 10 μm; PEDOT:PSS / graphite The ene layer includes PEDOT:PSS / graphene and PVDF, and the weight ratio of PEDOT:PSS / graphene and PVDF is more than 8:1. In this embodiment, since PEDOT:PSS itself has a certain viscosity, the content of PVDF can be further reduced, or even not used, as long as PEDOT:PSS / graphene can be firmly adhered to the zinc foil.

[0033] In this embodiment, the negative electrode includes a current collector and a negative electrode active material, and the negative electrode active material includes manganese dioxide and titanate ATiO 3 The mixture prepared at a mass ratio of 100:1 to 10, the ATiO 3 A in is Mg, Ca or Pb. The el...

Embodiment 2

[0044] In this embodiment, the positive electrode active material is a graphene layer, which is prepared in step 1 of the graphene sheet during preparation. , no PEDOT:PSS was added to the electrolyte; while in step 2), graphene sheets and PVDF were mixed in N-methylpyrrolidone (NMP) solvent at a weight ratio of 4:1; this is because the There is no PEDOT:PSS in the graphene sheet, so the amount of PVDF needs to be increased. Others are the same as in Example 1.

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Abstract

A zinc ion battery comprises a positive electrode, a diaphragm, a negative electrode and an aqueous electrolyte, the positive electrode comprises a zinc foil and a positive electrode active material, the positive electrode active material comprises a graphene layer or a PEDOT: PSS/graphene layer, and the thickness of the positive electrode active material is 1-50 [mu] m; the graphene layer comprises graphene and PVDF; and the weight ratio of the graphene to the PVDF is (8: 1)-(2: 1). According to the invention, effective interface optimization is carried out on the zinc (Zn) positive electrode through a nanofluid channel layer composed of graphene sheets or PEDOT: PSS modified graphene sheets; the distribution density of zinc ions can be effectively adjusted; and the growth of dendritic crystals is inhibited. Meanwhile, the positive electrode active material composed of the PEDOT: PSS modified graphene sheets is high in conductivity; and the cycle performance of the zinc ion battery is good.

Description

technical field [0001] The invention relates to a zinc ion battery, in particular to a zinc ion battery with no dendrite or less dendrite positive electrode and a preparation method thereof. Background technique [0002] Compared with current commercial lithium-ion batteries (LIBs), aqueous zinc-ion batteries (ZIBs) are more feasible for grid-scale battery technology. Zinc (Zn) metal cathodes for ZIBs have relatively high energy-to-price ratio, good electrical conductivity, suitable redox potential, and high water compatibility. Furthermore, employing aqueous electrolytes instead of organic electrolytes in ZIBs can significantly improve operational safety and reduce production costs. However, the practical performance of Zn anodes in neutral electrolytes is severely limited due to obvious disadvantages such as dendrite growth, self-discharge issues, and side reactions. Specifically, continuous dendrite growth causes short circuits by piercing through the separator, leading...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/36H01M4/62H01M10/38
CPCH01M4/624H01M4/625H01M4/628H01M10/36H01M10/38Y02E60/10Y02P70/50
Inventor 刘桂香周本胡唐鸽白文超
Owner SHAOYANG UNIV
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