Weakly acidic electrolyte additive for aqueous rechargeable zinc battery and application of weakly acidic electrolyte additive

A zinc battery, weakly acidic technology, applied in the field of water system rechargeable zinc battery electrolyte, can solve problems such as uncontrollable growth of zinc dendrites, irreversible side reactions between zinc electrodes and electrolyte

Pending Publication Date: 2021-09-07
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a weakly acidic electrolyte additive for water-based zinc-chargeable batteries, aiming at the uncontrollable growth of zinc dendrites and irreversible side reactions between zinc electrodes and electrolytes, which are common in water-based zinc-chargeable batteries. and its application

Method used

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  • Weakly acidic electrolyte additive for aqueous rechargeable zinc battery and application of weakly acidic electrolyte additive
  • Weakly acidic electrolyte additive for aqueous rechargeable zinc battery and application of weakly acidic electrolyte additive
  • Weakly acidic electrolyte additive for aqueous rechargeable zinc battery and application of weakly acidic electrolyte additive

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Embodiment 1

[0032] The invention discloses a weakly acidic electrolyte additive for a water system rechargeable zinc battery and its application in the electrolyte and the battery. The electrolyte additive is vanillin, and the electrolyte formula includes the vanillin additive, soluble zinc salt and deionized water. Zinc salt is zinc sulfate (ZnSO 4 ), and the solvent was deionized water. The preparation method is as follows: in the air environment (25°C), using deionized water as a solvent, prepare a zinc sulfate electrolyte solution with a concentration of 2mol / L, then add vanillin to make the concentration reach 3mmol / L, and ultrasonically disperse for 10 minutes to make it Uniformly dispersed to obtain the electrolyte solution (2mol / L ZnSO 4 +3mmol / L vanillin).

Embodiment 2-18

[0033] Embodiment 2-18 and comparative example 1-9

[0034] In Examples 2-18 and Comparative Examples 1-9, except that the proportions of the components of the electrolyte are added as shown in Table 1 and Table 2, the rest are the same as in Example 1. In addition, zinc trifluoromethanesulfonate: Zn(CF 3 SO 3 ) 2 ; Zinc acetate: Zn(CH 3 COO) 2 .

[0035] The composition ratio of each component of the electrolyte of table 1, embodiment 1-18

[0036] example Zinc salt type Zinc salt concentration Vanillin concentration Example 1 ZnSO 4

2mol / L 3mmol / L Example 2 ZnSO 4

2mol / L 5mmol / L Example 3 ZnSO 4

2mol / L 7mmol / L Example 4 ZnSO 4

2mol / L 10mmol / L Example 5 ZnSO 4

2mol / L 15mmol / L Example 6 ZnSO 4

2mol / L 25mmol / L Example 7 ZnSO 4

0.5mol / L 5mmol / L Example 8 ZnSO 4

1mol / L 10mmol / L Example 9 ZnSO 4

3mol / L 5mmol / L Example 10 ...

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Abstract

The invention discloses a weakly acidic electrolyte additive for a water-based rechargeable zinc battery and application of the weakly acidic electrolyte additive, and belongs to the technical field of zinc battery electrolyte. The electrolyte additive is vanillin (C8H8O3) small organic molecules, and the use amount of the vanillin additive is 1-60 mmol/L. The vanillin additive has a zinc-loving characteristic, can be adsorbed on the surface of a zinc negative electrode and guide zinc ion deposition at a zinc negative electrode/electrolyte interface, can effectively inhibit zinc dendrite growth, corrosion and other side reactions, improves the deposition/stripping efficiency of zinc, and further improves the cycle life and coulombic efficiency of the water-based rechargeable zinc battery. The vanillin additive has the advantages of being low in cost, environmentally friendly, free of toxicity and the like, the electrolyte formula and the preparation process are simple, and the vanillin additive has very wide application prospects in the field of water system rechargeable zinc batteries.

Description

technical field [0001] The invention belongs to the technical field of electrolyte for water system rechargeable zinc batteries, in particular to a weak acid electrolyte additive for water system rechargeable zinc batteries and its application. Background technique [0002] Due to the abundant zinc resources, low cost and easy availability, high environmental stability, and the high safety and environmental friendliness of aqueous electrolytes, aqueous rechargeable zinc batteries have attracted widespread attention in recent years as a new type of green electrochemical energy storage technology. However, due to the uncontrollable dendrite growth of the zinc anode and the irreversible side reactions of the electrode / electrolyte in the aqueous rechargeable zinc battery, the battery has low Coulombic efficiency and poor cycle stability, which hinders the practical application of the aqueous zinc rechargeable battery. . [0003] Aiming at the problems existing in water-based zi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/42H01M10/36
CPCH01M10/36H01M10/4235H01M2300/0005Y02E60/10
Inventor 程方益赵康张宇栋邱晓光李海霞
Owner NANKAI UNIV
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