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Chargeable and dischargeable aqueous solution energy storage device

An aqueous solution, charging and discharging technology, applied in electrical components, electrochemical generators, circuits, etc., can solve the problems of low battery voltage and low energy density, and achieve low voltage, high energy density, excellent stability and cycle performance Effect

Active Publication Date: 2019-11-12
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the problems of low voltage and low energy density of aqueous solution batteries, and provide a rechargeable and dischargeable aqueous solution energy storage device with high voltage and high energy density

Method used

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  • Chargeable and dischargeable aqueous solution energy storage device
  • Chargeable and dischargeable aqueous solution energy storage device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Except that the electrolyte is 4M Mg(ClO 4 )+1M LiClO 4 Except +20wt.% PEG-400 aqueous solution, other compositions and test conditions are the same as Comparative Example 1. The data obtained from the tests are summarized in Table 1. Its CV diagram at a scan rate of 0.3mV / s, the charge-discharge curve at a current density of 0.25A / g, and the 300-time charge-discharge cycle curve are shown in Figure 1(a), Figure 1(b) and Figure 1, respectively. (c).

Embodiment 2

[0054] Except that the electrolyte is 4M Mg(ClO 4 )+1M LiClO 4 Except for +10wt.% PVA aqueous solution, other compositions and test conditions are the same as Comparative Example 2. The data obtained from the tests are also summarized in Table 1. Its CV diagram at a scan rate of 0.3mV / s, the charge-discharge curve at a current density of 1A / g, and 300 charge-discharge cycle curves are shown in Figure 1(a), Figure 1(b) and Figure 1( c).

Embodiment 3

[0058] Except that the electrolyte is 6M Mg(ClO 4 )+10wt.% PEO aqueous solution, other compositions and test conditions are the same as Comparative Example 2. The data obtained from the tests are also summarized in Table 1. Its CV diagrams at different scan rates, charge-discharge curves at different current densities, and 2200 charge-discharge cycle curves are shown in Figure 3(a), Figure 3(b) and Figure 3(c), respectively.

[0059] Table 1. Part data and results of comparative examples and embodiments

[0060]

[0061]

[0062] *: Data calculated based on the actual capacity and actual average voltage of positive and negative active materials;

[0063] **: Negative electrode material is calculated based on the amount of metal magnesium as 1 mole.

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Abstract

The invention relates to a chargeable and dischargeable aqueous solution energy storage device. The energy storage device is mainly composed of a magnesium salt aqueous solution containing an organicadditive and an electrode material, wherein the negative electrode is metal magnesium or magnesium alloy; and the positive electrode is a carbon material capable of performing ion reversible adsorption / desorption, oxide capable of producing pseudocapacitance or a conductive polymer capable of generating pseudocapacitance, oxide capable of performing a redox reaction or an intercalation compound capable of performing ion reversible intercalation / deintercalation. The chargeable and dischargeable aqueous solution energy storage device has a high electrochemical stability window, and the energy density can reach more than 260Wh / kg, which is much higher than that of an ordinary aqueous solution energy storage device. The chargeable and dischargeable aqueous solution energy storage device can beused for storage and release of power.

Description

technical field [0001] The present invention relates to a chargeable and dischargeable aqueous solution energy storage device, in particular to a rechargeable and dischargeable aqueous solution energy storage device based on a metal magnesium negative electrode, and more particularly to a magnesium salt aqueous solution storage device based on a metal magnesium negative electrode and containing organic additives. capable device. Background technique [0002] Rechargeable magnesium batteries have been considered as a very promising technology for energy storage and conversion. Magnesium metal is one of the metal negative electrodes that can be used in high-energy-density batteries. It has the following characteristics: mild chemical properties and abundant reserves; magnesium has a low reduction potential (-2.37V); the theoretical specific capacity is large (2205mAh / g, 3830mAh / cm 3 ); unlike Li metal, Mg metal does not form dendrites during the reversible electrochemical d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/054H01M10/0569
CPCH01M10/0567H01M10/054H01M10/0569H01M2300/0025Y02E60/10
Inventor 吴宇平袁新海朱玉松付丽君陈宇辉
Owner NANJING UNIV OF TECH
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