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A kind of porous tin foil negative electrode and its preparation method and sodium ion secondary battery

A secondary battery, sodium ion technology, applied in secondary batteries, battery electrodes, electrode manufacturing and other directions, can solve problems affecting battery charge and discharge efficiency, cycle performance safety performance, negative electrode pulverization, etc., to improve charge and discharge efficiency, The effect of stable performance and easy industrial production

Active Publication Date: 2020-04-21
REAL POWER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this new type of high-efficiency battery system has higher specific energy density and lower cost due to the reduction of traditional negative electrode active materials, there are some problems when using tin foil as a negative electrode sheet, such as volume expansion when tin-sodium alloying ( 112%) makes the negative electrode pulverized and the tin foil is compatible with the electrolyte during charging and discharging, which affects the charging and discharging efficiency, cycle performance and safety performance of the battery

Method used

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  • A kind of porous tin foil negative electrode and its preparation method and sodium ion secondary battery
  • A kind of porous tin foil negative electrode and its preparation method and sodium ion secondary battery
  • A kind of porous tin foil negative electrode and its preparation method and sodium ion secondary battery

Examples

Experimental program
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Effect test

Embodiment 1

[0048] A preparation method of a porous tin foil negative electrode, comprising the following steps:

[0049] (1) For a tin foil with a thickness of 20 microns, according to the design parameters that the area of ​​the hole in each smallest unit is 25%, the hole diameter is 1 mm, the shape of the hole is a round hole, and the distance between the edge of the outermost hole and the edge of the tin foil is 2 mm, Porous tin foil is processed and manufactured by mechanical molding, and compressed air is used to purge and remove burrs;

[0050] (2) Subsequently, an aqueous solution containing 1 wt% acetylene black was coated on the porous tin foil obtained above, and dried at a constant temperature of 100° C. for 4 hours to obtain a porous tin foil negative electrode.

[0051] figure 1 It is a schematic structural view of the porous tin foil of Example 1 of the present invention; among the figures, d is the distance (4 mm) between the edge of the outermost hole and the edge of the...

Embodiment 2-25

[0059] Referring to the specific steps of Example 1, adjusting relevant parameters can obtain different Examples 2-25. Concrete embodiment parameter and test result are as shown in table 1:

[0060] Table 1

[0061]

[0062]

Embodiment 26

[0064] A preparation method of a porous tin foil negative electrode, comprising the following steps:

[0065] (1) The tin foil with a thickness of 20 microns is mechanically molded according to the design parameters that the area ratio of the holes in the smallest unit is 25%, the hole diameter is 1 mm, the shape of the hole is a round hole, and the distance between the edge of the hole and the edge of the tin foil is 2 mm. Processing method, process and manufacture porous tin foil, and use compressed air to blow and remove burrs;

[0066] (2) Subsequently, an aqueous solution containing 1 wt% acetylene black was coated on the porous tin foil obtained above, and dried at a constant temperature of 100° C. for 4 hours to obtain a porous tin foil negative electrode.

[0067] image 3 Shown is a schematic structural view of the porous tin foil of Example 64 of the present invention. In the figure, d is the distance between the edge of the outermost hole and the edge of the tin f...

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Abstract

The invention provides a porous tinfoil negative pole which comprises porous tinfoil, wherein the porous holes are arranged in the porous tinfoil; the triangle region formed by the central lines of every three adjacent holes is the minimum unit; the area of holes in each minimum unit accounts for 1-89%; and the distance between the edge of the porous tinfoil and each porous hole is 0.1-10mm. The porous tinfoil negative pole can be used in a novel sodium ion battery system which uses tinfoil simultaneously as the current collector and negative pole active material, effectively solves the problem of battery expansion caused by tin-sodium alloying, and can effectively relieve the problem that the solid electrolyte membrane is decomposed in the battery charge-discharge cycle process and the problem of short circuit since the tinfoil burr punctures the diaphragm, thereby enhancing the charge-discharge efficiency, cycle stability and safety performance of the battery. The invention also provides a preparation method of the porous tinfoil negative pole and a sodium ion secondary battery.

Description

technical field [0001] The invention relates to the technical field of sodium ion secondary batteries, in particular to a porous tin foil negative electrode, a preparation method thereof and a sodium ion secondary battery. Background technique [0002] In 2016, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences made a breakthrough in the research of new high-efficiency batteries, and developed a new aluminum-graphite dual-ion battery technology. The research results were published on "Advanced Energy Materials" (DOI: 10.1002 / aenm.201502588), this new type of high-efficiency battery system uses aluminum foil as the negative electrode sheet, and the aluminum foil acts as the current collector and negative electrode active material at the same time. Due to the reduction of traditional negative electrode active materials, the specific energy density is higher and the cost is lower. It has great applications prospect. [0003] At the same time, the research...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/38H01M4/04H01M10/054
CPCH01M4/04H01M4/387H01M10/054Y02E60/10
Inventor 唐永炳谢呈德圣茂华
Owner REAL POWER IND LTD