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Tin-based negative electrode sodium ion secondary battery

A secondary battery and sodium ion technology, applied in secondary batteries, battery electrodes, circuits, etc., can solve the problems of tin electrode structure collapse, active material falling off, and loss of electrical contact, etc., so as to reduce the harm to the environment and improve Energy density, easy preparation effect

Inactive Publication Date: 2019-09-06
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the tin anode is completely sodiumized, different unit cell parameters and structures will lead to a huge volume change, with a volume expansion of up to 420%; during discharge, sodium ions are deintercalated from the tin anode, and the volume shrinks, causing the structure of the tin electrode to collapse.
After many cycles, the repeated volume expansion and contraction eventually lead to the loss of the active material from the tin current collector and the loss of electrical contact, leading to battery failure.

Method used

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  • Tin-based negative electrode sodium ion secondary battery
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  • Tin-based negative electrode sodium ion secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] This embodiment is the production of a pure tin sodium ion half-cell.

[0031] 100 μm tin foil and 100 μm sodium metal were cut into discs with a diameter of 12 mm as the negative electrode material of the half-cell, and assembled with sodium vanadium phosphate as the positive electrode to obtain a pure tin-sodium ion half-cell. Subsequently, the cycle test of the pure tin sodium ion half-cell was carried out, and the cycle coulombic efficiency was calculated. The test results are shown in figure 1 .

[0032] figure 1 It is a diagram of the cycle stability test results of the pure tin sodium ion half-cell in Example 1 of the present invention.

[0033] Such as figure 1 As shown, the abscissa represents the cycle number of the pure tin sodium ion half-cell, and the ordinate represents the coulombic efficiency of the pure tin sodium ion half cell, by figure 1 It can be seen that after the tin metal negative electrode has been activated for several initial cycles (abou...

Embodiment 2

[0035] This embodiment is the manufacture of a tin-silver-copper alloy sodium ion secondary full battery.

[0036] A tin-silver-copper alloy foil of 70 μm was selected as the negative electrode material, cut into a disc with a diameter of 12 mm, and a tin-silver-copper alloy sodium ion secondary full battery was assembled with the sodium vanadium phosphate positive electrode. Subsequently, the full battery was subjected to a cycle charge and discharge test, and the test results are shown in figure 2 . Wherein, the silver content in the tin-silver-copper alloy foil is 3wt%, the copper content is 0.5wt%, and the balance is tin.

[0037] figure 2 It is the capacity-voltage graph of the tin-based negative electrode sodium-ion full battery in Example 2 of the present invention.

[0038] Such as figure 2 As shown, the abscissa represents the battery charge and discharge capacity, and the ordinate represents the charge and discharge voltage. Depend on figure 2 It can be see...

Embodiment 3

[0040] This embodiment is the fabrication of a tin-antimony alloy sodium ion secondary full battery.

[0041] A tin-antimony alloy foil of 70 μm was selected as the negative electrode material, cut into discs with a diameter of 12 mm and assembled with a sodium vanadium phosphate positive electrode to obtain a tin-antimony alloy sodium ion secondary full battery, and the full battery was charged and discharged. The test results are shown in image 3 . Wherein, the antimony content in the tin-antimony alloy foil is 5wt%, and the balance is tin.

[0042] image 3 It is a graph showing the charge and discharge results of the tin-antimony alloy sodium ion secondary full battery in Example 3 of the present invention.

[0043] Such as image 3 As shown, the abscissa represents the number of cycles, the ordinate represents the discharge specific capacity, and the right ordinate represents the Coulomb efficiency. Depend on image 3 It can be seen that the initial discharge capaci...

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Abstract

The invention provides a tin-based negative electrode sodium ion secondary battery, which comprises a tin-based negative electrode and a sodium ion positive electrode, wherein the tin-based negative electrode is a tin-based metal foil. Due to direct use of the tin-based metal foil as the negative electrode material of the sodium ion secondary battery, tedious slurrying, coating and drying processes of the tin powder negative electrode are saved; and meanwhile, due to excellent electrical conductivity and mechanical properties of the tin-based metal foil, the tin-based metal foil can be used asa self-supporting electrode directly without a binding agent and a conductive agent, thereby reducing harm of an organic solvent to environment in the preparation process of a battery electrode sheet, and meanwhile, improving energy density of a battery. The provided tin-based negative electrode sodium ion secondary battery is easy to prepare; and the required industrial technology and equipmentare mature and easy to promote.

Description

technical field [0001] The invention belongs to the field of sodium ion secondary batteries, in particular to a tin-based negative electrode sodium ion secondary battery. Background technique [0002] With the development of society and the continuous growth of the world population, the human demand for energy is increasing day by day. Batteries store electrical energy in the form of chemical energy. When charging, the electrical energy provided by the external circuit is converted into chemical energy. When discharging, the chemical energy can be efficiently converted into electrical energy. Because it is portable and portable, batteries are widely used in various fields. Compared with primary batteries such as lead storage batteries, nickel-cadmium batteries, nickel-metal hydride batteries, and alkaline-manganese batteries, secondary batteries have many advantages. [0003] Both sodium-ion batteries and lithium-ion batteries belong to secondary batteries. Since sodium and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/054H01M4/134H01M4/1395H01M4/38
CPCH01M4/134H01M4/1395H01M4/387H01M10/054Y02E60/10
Inventor 胥会李洒黄云辉张灿陈鑫龙刘文健
Owner TONGJI UNIV
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