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A kind of negative plate for sodium ion battery

A technology for sodium ion batteries and negative electrode sheets, which is applied in battery electrodes, electrode manufacturing, secondary batteries, etc., can solve the problems that the active material layer is easy to fall off, the preparation method of the negative electrode electrode is cumbersome, and the preparation method of the electrode is complicated. Increased area, easy to prepare effects

Active Publication Date: 2020-07-03
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Traditionally, tin oxide is used as the negative electrode material for sodium-ion batteries. The negative electrode sheet is composed of active materials, conductive agents and binders, so the energy density and capacity of the battery are limited.
The traditional pole piece preparation method is complicated. First, tin oxide particles are prepared by hydrothermal method. After the active material tin oxide, conductive agent and binder are mechanically mixed, 1-methyl-2-pyrrolidone is added dropwise to form a slurry and then coated. On copper foil, use after evaporative drying
Therefore, the preparation method of the negative electrode sheet of the traditional sodium ion battery using tin oxide as the negative electrode material is cumbersome, and the active material and the current collector can only be in two-dimensional plane contact, so the active material layer is relatively easy to fall off

Method used

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  • A kind of negative plate for sodium ion battery
  • A kind of negative plate for sodium ion battery
  • A kind of negative plate for sodium ion battery

Examples

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Effect test

Embodiment 1

[0030] This embodiment provides a negative electrode sheet for a sodium ion battery, comprising a porous current collector with a large number of pore structures distributed on the surface and tin oxide nano-spherical particles electroplated and deposited on the porous current collector. Wherein, the pore diameter of the pore structure is 100 nm-5 μm. The hole structure is a through hole and / or a blind hole, and the ratio of the projected area of ​​the hole structure to the projected area of ​​the porous current collector is 40%. The diameter of the tin oxide nano spherical particles is 100nm-3μm, and the tin oxide nano spherical particles are evenly deposited in the pore structure and the non-porous area of ​​the porous current collector. The ratio of the mass of the tin oxide nano-spherical particles to the mass of the porous current collector is 1:5.7. The porous current collector is made of copper.

[0031] Its preparation method at least includes the following steps:

...

Embodiment 2

[0041] This embodiment provides a negative electrode sheet for a sodium ion battery, comprising a porous current collector with a large number of pore structures distributed on the surface and tin oxide nano-spherical particles electroplated and deposited on the porous current collector. Wherein, the pore diameter of the pore structure is 100 nm-5 μm. The hole structure is a through hole and / or a blind hole, and the ratio of the projected area of ​​the hole structure to the projected area of ​​the porous current collector is 50%. The diameter of the tin oxide nano spherical particles is 100nm-3μm, and the tin oxide nano spherical particles are evenly deposited in the pore structure and the non-porous area of ​​the porous current collector. The ratio of the mass of the tin oxide nano-spherical particles to the mass of the porous current collector is 1:6.5. The porous current collector is made of copper.

[0042] Its preparation method at least includes the following steps:

...

Embodiment 3

[0051] This embodiment provides a negative electrode sheet for a sodium ion battery, comprising a porous current collector with a large number of pore structures distributed on the surface and tin oxide nano-spherical particles electroplated and deposited on the porous current collector. Wherein, the pore diameter of the pore structure is 100 nm-5 μm. The hole structure is a through hole and / or a blind hole, and the ratio of the projected area of ​​the hole structure to the projected area of ​​the porous current collector is 60%. The diameter of the tin oxide nano spherical particles is 100nm-3μm, and the tin oxide nano spherical particles are evenly deposited in the pore structure and the non-porous area of ​​the porous current collector. The ratio of the mass of the tin oxide nano-spherical particles to the mass of the porous current collector is 1:4.5. The porous current collector is made of copper.

[0052] Its preparation method at least includes the following steps:

...

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Abstract

The invention belongs to the technical field of a sodium ion battery, and particularly relates to a negative pole plate of the sodium ion battery. The negative pole plate comprises a porous current collector and tin oxide nanometer spherical particles, wherein a large amount of pore structures are arranged on a surface of the porous current collector, and the tin oxide nanometer spherical particles are electroplated and deposited on the porous current collector. Compared with the prior art, an active substance is directly electroplated on the current collector, and a conductive agent and a binding agent are prevented from being used. Moreover, the preparation method is simple. The operation of electroplating the tin oxide particles on the porous current collector is completed by two steps of firstly, forming the porous current collector by etching to obtain the porous current collector with holes having unequal diameters being 100 nanometers to 5 micrometers in the surface; and secondly, growing a large amount of tin oxide particles having diameters being 100 nanometers to 3 micrometers by electroplating and deposition so that the contact area of tin oxide and the current collector is substantially expanded. When the negative pole plate is used in the sodium ion battery, the reversible specific capacity reaches 432mAh / g.

Description

technical field [0001] The invention belongs to the technical field of sodium ion batteries, and in particular relates to a negative electrode sheet for sodium ion batteries. Background technique [0002] Nanoporous metal materials have dual properties of structural and functional materials. They not only have nanoscale pores and high specific surface area, but also have some special physical and chemical properties. [0003] The negative electrode sheet of the traditional sodium-ion battery using tin oxide as the negative electrode material is composed of active material, conductive agent and binder, so the energy density and capacity of the battery are limited. The traditional pole piece preparation method is complicated. First, tin oxide particles are prepared by hydrothermal method. After the active material tin oxide, conductive agent and binder are mechanically mixed, 1-methyl-2-pyrrolidone is added dropwise to form a slurry and then coated. On copper foil, use after ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/131H01M4/1391H01M4/04H01M10/054C25F3/02C25D9/06
CPCC25D9/06C25F3/02H01M4/0454H01M4/131H01M4/1391H01M10/054Y02E60/10
Inventor 贺艳兵位艳杰叶桁徐佳雷丹妮吕伟李宝华杨全红康飞宇
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV