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Li/Na-O2 secondary battery with Li/Na composite metal negative pole

A composite metal, secondary battery technology, applied in the direction of fuel cell type half cells and secondary battery type half cells, battery electrodes, circuits, etc., can solve the problems of limiting the actual energy density, low discharge potential, etc. Effects of battery performance, long cycle life, and reduced manufacturing costs

Inactive Publication Date: 2018-09-07
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its relatively low discharge potential limits its practical energy density

Method used

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  • Li/Na-O2 secondary battery with Li/Na composite metal negative pole
  • Li/Na-O2 secondary battery with Li/Na composite metal negative pole
  • Li/Na-O2 secondary battery with Li/Na composite metal negative pole

Examples

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Effect test

Embodiment 1

[0037] A Li / Na-O with Li / Na composite mass ratio of 2:1 2 secondary batteries, such as figure 1 As shown, it consists of negative electrode shell 1, shrapnel 2, gasket 3, Li / Na composite sheet 4, diaphragm 5, positive electrode catalyst 6, current collector 7, and porous positive electrode casing 8, wherein Li / Na composite sheet 4 is the negative electrode, and the air The (oxygen) electrode is composed of a positive electrode catalyst 6 and a current collector 7 with a porous structure; the shrapnel 2 is a stainless steel sheet, which is used to fill the internal space of the battery to improve the airtightness of the battery; the gasket 3 is a stainless steel sheet; the diaphragm 5 is located on the negative electrode Li / Na Between the composite sheet 4 and the positive electrode catalyst 6, it is used to transmit ions while blocking electrons; the electrolyte is LiClO 4 / NaClO 4 / Tetraethylene glycol dimethyl ether (TEGDME) solution, in which LiClO 4 with NaClO 4 The m...

Embodiment 2

[0045] A kind of Li / Na-O 2 The preparation method of the secondary battery is basically the same as in Example 1, except that the Li / Na mass ratio in the Li / Na composite negative electrode used is 1:2.

[0046] Figure 9 It is an optical photo of a Li / Na composite negative electrode with a Li / Na mass ratio of 1:2, showing that the thickness of metal sodium and metal lithium is uniform, and the cross-section is neat. Figure 10 The middle curve ② is the Li / Na composite negative electrode with Li / Na mass ratio of 1:2-O 2 Secondary battery 200mA g -1 Charge and discharge performance graph, at 200mAg -1 Charge and discharge at current density, compared with pure Na anode, the discharge platform is increased by 0.2V. Figure 11 The middle curve ② is the Li / Na composite negative electrode with Li / Na mass ratio of 1:2-O 2 Secondary battery 100mAg -1 Charge and discharge performance graph, at 100mAg -1 Charge and discharge at current density, compared with pure Na anode, the di...

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Abstract

The invention relates to an Li / Na-O2 secondary battery with a composite metal negative pole; the Li / Na-O2 secondary battery is a button battery. The Li / Na-O2 secondary battery is formed by assemblinga negative pole shell, a spring sheet, a gasket, an Li / Na clad sheet, a diaphragm, electrolyte, a positive plate and a porous positive pole shell, wherein the Li / Na clad sheet is a negative pole; thepositive plate consists of a positive pole catalyst with a porous structure and a current collector; the spring sheet and the gasket are stainless steel sheets; the diaphragm is positioned between a negative pole sodium plate and the positive current collector; the electrolyte is an LiClO4 / NaClO4 / tetraethylene glycol dimethyl ether (TEGDME) solution; the electrolyte infiltrates the diaphragm. Thebattery provided by the invention has a high discharge platform and high discharge capacity. Furthermore, compared with a lithium-oxygen battery, the cost of the Li / Na-O2 secondary battery is greatlylowered.

Description

technical field [0001] The invention relates to a new type of secondary battery, in particular to a Li / Na-O battery using a Li / Na composite metal negative electrode. 2 A secondary battery and a preparation method thereof belong to the field of novel chemical power sources. Background technique [0002] Lithium-oxygen batteries and sodium-oxygen batteries are electrochemical energy storage devices in which oxygen is used as the battery energy source. The typical structure of the battery is to use alkali metal lithium or sodium as the negative electrode, an organic solvent dissolved with the corresponding metal salt as the electrolyte, porous carbon as the positive electrode carrier / catalyst, and the active material in the positive electrode is oxygen in the air. [0003] Compared with other energy storage systems such as lithium-ion batteries and lithium-sulfur batteries, lithium-oxygen batteries have higher theoretical capacity and energy density. Compared with the current...

Claims

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Application Information

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IPC IPC(8): H01M12/08H01M4/134H01M4/1395H01M4/04H01M4/96H01M4/88
CPCH01M4/04H01M4/0435H01M4/134H01M4/1395H01M4/8839H01M4/96H01M12/08H01M2300/0025Y02E60/10
Inventor 陈军李子凡张雪静张秋陶占良李海霞梁静
Owner NANKAI UNIV
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