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Aqueous zinc ion battery electrolyte containing additive, preparation method of aqueous zinc ion battery electrolyte and battery

A technology for preparing zinc ion batteries and electrolytes, which is applied to aqueous electrolytes, secondary batteries, circuits, etc., can solve problems such as short circuit, low Coulombic efficiency, loss of active materials, etc., and achieves simple process, improved Coulombic efficiency, and improved energy density. Effect

Active Publication Date: 2021-07-23
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, studies have shown that zinc tends to deposit in the form of dendrites during the deposition process to form zinc dendrites, which will fall off to form dead zinc when it grows wantonly to a certain extent, resulting in the loss of active materials, low Coulombic efficiency, and even piercing. The diaphragm causes an internal short circuit

Method used

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  • Aqueous zinc ion battery electrolyte containing additive, preparation method of aqueous zinc ion battery electrolyte and battery
  • Aqueous zinc ion battery electrolyte containing additive, preparation method of aqueous zinc ion battery electrolyte and battery
  • Aqueous zinc ion battery electrolyte containing additive, preparation method of aqueous zinc ion battery electrolyte and battery

Examples

Experimental program
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Effect test

Embodiment 1

[0040] At room temperature, completely dissolve 14.38 g of zinc sulfate heptahydrate in 50 mL of deionized water, then add 0.283 g of lanthanum sulfate (0.01 mol / L), dissolve evenly, and set aside. Zinc foil is used as the positive and negative electrodes, and glass fiber is used as the diaphragm to assemble the water system zinc-ion symmetrical battery. Sodium vanadate is used as the positive electrode, zinc foil is used as the negative electrode, and glass fiber is used as the diaphragm to assemble the aqueous zinc-ion full battery. Preparation of positive and negative electrodes and assembly of coin-type CR2032 symmetrical batteries and NaV 3 o 8 1.5H 2 O / / Zn full battery, XRD, SEM sample preparation, and open circuit voltage test procedures are the same as in Comparative Example 1. Figure 5 The XRD pattern shows that all the characteristic peaks match well with the standard phase of metal Zn (PDF#04-0831), and no impurity peaks are observed, proving that La 3+ Will ex...

Embodiment 2

[0042] At room temperature, completely dissolve 14.38 g of zinc sulfate heptahydrate in 50 mL of deionized water as an electrolyte, then add 0.849 g of lanthanum sulfate (0.03 mol / L), dissolve evenly, and set aside. Zinc foil is used as the positive and negative electrodes, and glass fiber is used as the diaphragm to assemble the water system zinc-ion symmetrical battery. Manganese dioxide is used as the positive electrode, zinc foil is used as the negative electrode, and glass fiber is used as the diaphragm to assemble the water-based zinc-ion full battery. Preparation of positive and negative electrodes and assembly of coin-type CR2032 symmetrical batteries and MnO 2 / / Zn full battery, XRD, SEM sample preparation, and open circuit voltage test procedures are the same as in Comparative Example 1. The electrochemical test results are shown in Table 1. The water-based zinc-ion symmetric battery was tested at 1, 5 and 10 mA cm -2 , the cycle life is as high as 308, 602 and 586...

Embodiment 3

[0044] At room temperature, completely dissolve 14.38 g of zinc sulfate heptahydrate in 50 mL of deionized water, then add 0.849 g of lanthanum sulfate (0.03 mol / L), dissolve evenly, and set aside. Sodium vanadate is used as the positive electrode, zinc foil is used as the negative electrode, and glass fiber is used as the diaphragm to assemble the aqueous zinc-ion full battery. Preparation of positive and negative electrodes and NaV 3 o 8 1.5H 2 The assembly of O / / Zn full cells is the same as in Comparative Example 1. Electrochemical test results are shown in Table 1 and Figure 9 As shown, the aqueous Zn-ion full battery is at 1A·g -1 , the Coulombic efficiency is 99% and the capacity retention after 100 cycles is 92%, and Figure 10 It also shows a small impedance, which is beneficial to reduce the full cell polarization voltage.

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Abstract

The invention discloses an additive-containing aqueous zinc ion battery electrolyte, a preparation method thereof and a battery. The electrolyte additive is a lanthanum-containing compound (such as lanthanum sulfate, lanthanum nitrate, lanthanum chloride, lanthanum acetate and hydrates thereof). The electrolyte additive can form a protective layer on a surface of zinc metal through absorption or deposition in the zinc metal deposition process, and the protective layer can adjust the deposition behavior of zinc ions and effectively inhibit generation of zinc dendrites, so the energy utilization rate and cycle stability of the battery are improved; by matching with a high-performance positive electrode material, the industrialization process of the water-based zinc ion battery can be promoted.

Description

technical field [0001] The invention belongs to the technical field of water-based zinc-ion batteries, and in particular relates to an electrolyte solution for a water-based zinc-ion battery containing additives, a preparation method thereof, and a battery. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, long cycle life and high reversibility, and have been widely used in portable electronic devices, electric vehicles and aerospace, and have good application prospects in large-scale energy storage and other fields. However, the high cost of lithium-ion batteries, lack of lithium resources, and poor safety limit their further development. Compared with traditional organic lithium-ion batteries, aqueous zinc-ion batteries have the advantages of high safety, low cost and high ion conductivity, and have good application prospects in the field of large-scale energy storage. At present, most of the research on zinc-ion batteries foc...

Claims

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Application Information

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IPC IPC(8): H01M10/36
CPCH01M10/36H01M2300/0002Y02E60/10
Inventor 孙旦李翼虎王海燕唐有根钟威
Owner CENT SOUTH UNIV
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