Aqueous zinc ion battery electrolyte for inhibiting vanadium dissolution of vanadium-based positive electrode as well as preparation method and application thereof

A zinc-ion battery, electrolyte technology, applied in water-based electrolytes, secondary batteries, acid electrolytes, etc., to achieve the effect of improving stability, reducing quantity, and inhibiting the activity of water molecules

Inactive Publication Date: 2021-07-09
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the problem of vanadium dissolution is often ignored in the research of aqueous vanadium-based zinc-ion batteries.

Method used

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  • Aqueous zinc ion battery electrolyte for inhibiting vanadium dissolution of vanadium-based positive electrode as well as preparation method and application thereof
  • Aqueous zinc ion battery electrolyte for inhibiting vanadium dissolution of vanadium-based positive electrode as well as preparation method and application thereof
  • Aqueous zinc ion battery electrolyte for inhibiting vanadium dissolution of vanadium-based positive electrode as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Preparation of aqueous zinc-ion battery electrolyte:

[0027] On the basis of 2M zinc trifluoromethanesulfonate electrolyte, add 3M concentration of lithium trifluoromethanesulfonate, ultrasonically disperse for a certain period of time and dissolve to obtain an aqueous zinc-ion battery electrolyte.

[0028] Preparation of positive electrode sheet:

[0029] The active substance (VO 2 ), carbon black, and PVDF were formulated into a slurry in a ratio of 7:2:1, and after stirring for 24 hours, the slurry was coated on a stainless steel mesh, and vacuum-dried for 12 hours to obtain VO 2 Positive pole piece.

[0030] Use Raman (LabRAM HR, Horiba JobinYvon) to analyze the activity of water molecules in the electrolyte, and get figure 1 and figure 2 . From figure 1 and figure 2 It can be seen that as the concentration of lithium trifluoromethanesulfonate increases, the intensity of the water absorption peak corresponding to Raman decreases gradually, indicating that ...

Embodiment 2

[0035] On the basis of the 2M zinc trifluoromethanesulfonate electrolyte, add 6M lithium trifluoromethanesulfonate, ultrasonically disperse and dissolve for a certain period of time to obtain an aqueous zinc-ion battery electrolyte.

[0036] The positive electrode sheet and battery test conditions were the same as in Example 1. Test results such as image 3 , 4 As shown, it can be seen that the cycle stability of the battery is further improved.

Embodiment 3

[0038] On the basis of the 2M zinc trifluoromethanesulfonate electrolyte, add 8M lithium trifluoromethanesulfonate, ultrasonically disperse and dissolve for a certain period of time to obtain an aqueous zinc-ion battery electrolyte.

[0039] The positive electrode sheet and battery test conditions were the same as in Example 1. Test results such as image 3 , 4 As shown, it can be seen that the cycle stability of the battery has been greatly improved. On the premise of sacrificing part of the initial capacity, the higher the concentration, the better the cycle stability of the battery. Among them, 0.1A g at low current density -1After 200 cycles, its capacity retention rate still reaches 99.6%, basically no decline, and the high current density is 10A g -1 Next, after 10,000 cycles, the capacity retention rate is 89.7%. It shows that the invention has significantly improved battery stability.

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Abstract

The invention provides an aqueous zinc ion battery electrolyte for inhibiting vanadium dissolution of a vanadium-based positive electrode as well as a preparation method and application of the aqueous zinc ion battery electrolyte. The aqueous zinc ion battery electrolyte comprises the following components: zinc trifluoromethanesulfonate (Zn (CF3SO3) 2), lithium trifluoromethanesulfonate (LiCF3SO3) and water. Through combination of the zinc trifluoromethanesulfonate and the lithium trifluoromethanesulfonate, on one hand, the number of free water molecules in the electrolyte can be effectively reduced, the activity of the water molecules is inhibited, and the stability of an electrode interface is improved; and on the other hand, the solvation structure of hydrated zinc ions in the aqueous electrolyte can be changed, the number of coordinated water molecules is reduced, the number of intercalated water molecules is further reduced, and the lattice main structure is effectively stabilized. The electrolyte is used for being matched with the vanadium-based positive electrode of the aqueous zinc ion battery, so that the cycling stability of the positive electrode under small current is remarkably improved, and the purpose of inhibiting vanadium dissolution is achieved.

Description

technical field [0001] The invention relates to an aqueous zinc-ion battery electrolyte capable of inhibiting the dissolution of vanadium in a vanadium-based positive electrode, a preparation method and application thereof. Background technique [0002] The current research work on aqueous rechargeable zinc-ion batteries is mainly focused on exploring high-performance cathode materials, such as vanadium-based materials, manganese-based materials, Prussian blue and its derivatives, transition metal dichalcogenides, and organic electrode materials. Through a series of mechanism research and structural optimization, the electrochemical performance of cathode materials, especially the cycle stability, has been greatly improved. Among them, vanadium oxides exhibit different oxidation valence states (V 5+ , V 4+ , V 3+ , V 2+ ), these valence states can be transformed into each other. Moreover, due to the distortion produced by the V-O coordination polyhedron and the mutual t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/38H01M10/36H01M10/42
CPCH01M10/38H01M10/36H01M10/4235H01M2300/0005Y02P70/50Y02E60/10
Inventor 李成超刘苏城杨阳张宇斐叶明晖
Owner GUANGDONG UNIV OF TECH
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