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Sodium secondary cell electrode and sodium secondary cell

A sodium secondary battery and electrode technology, applied in the field of sodium secondary battery electrodes and sodium secondary batteries, can solve problems such as worry, and achieve the effect of suppressing the reduction of discharge capacity

Inactive Publication Date: 2013-12-11
TOKYO UNIVERSITY OF SCIENCE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, in lithium secondary batteries, raw materials containing expensive rare metal elements such as lithium are often used in the manufacture of its constituent materials, so the supply of the raw materials used to cope with the increase in demand for large-scale power supplies is difficult. say worrying

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0085] As the solvent used in the preparation of the electrode mixture paste, for example, in addition to water, aprotic polar solvents such as N-methylpyrrolidone; alcohols such as isopropanol, ethanol, and methanol; propylene glycol dimethyl ether, etc. Ethers; ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone, etc. In the case where the binder increases the viscosity, a plasticizer may also be used for ease of coating on the current collector.

[0086] There is no particular limitation on the method of coating the electrode mixture paste on the current collector. For example, methods such as a slot die coating method, a screen coating method, a curtain coating method, a knife coating method, a gravure coating method, and an electrostatic spraying method are mentioned. In addition, as drying performed after coating, heat treatment may be performed, and blast drying, vacuum drying, or the like may be performed. In the case of drying by heat treatment, the...

Embodiment 1

[0161] (Na secondary battery electrode E 1 manufacturing)

[0162] Sn powder (manufactured by Aldrich Corporation (particle size: 150 nm, purity: 99.7%) , acetylene black (manufactured by Denki Kagaku Kogyo Co., Ltd.) as a conductive material, and polyvinylidene fluoride (PVdF: manufactured by KUREHA Co., Ltd., #1300) as an electrode-forming agent. First, the electrode-forming agent was added to an agate mortar, and Among them, an appropriate amount of N-methyl-2-pyrrolidone (NMP: manufactured by Tokyo Chemical Industry Co., Ltd.) was added as a solvent and mixed thoroughly. After confirming that the electrode forming agent was dissolved, an electrode active material and a conductive material were added and mixed thoroughly. This results in an electrode mixture paste. Apply the resulting electrode mixture paste on a copper foil with a thickness of 100 μm using a dispenser, put it in a dryer, and dry it sufficiently while removing the solvent to obtain Electrode sheet. After ...

Embodiment 2

[0164] (Na secondary battery electrode E 2 manufacturing)

[0165] Except that polyacrylic acid (PAA: manufactured by Sigma Aldrich, molecular weight 750,000) was used as an electrode forming agent instead of PVdF, and ion-exchanged water was used as a solvent, the sodium secondary battery electrode E was obtained by the same operation as in Example 1. 2 .

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Abstract

The present invention provides an electrode that can be used for a sodium secondary cell having a discharge capacity upon repeated charging and discharging that is greater than in the prior art. This sodium secondary cell electrode contains tin (Sn) powder as an electrode active material. The electrode further contains one or more electrode-forming agents selected from the group consisting particularly of polyvinylidene fluoride (PVDF), polyacrylic acid (PAA), sodium polyacrylate (PAANa), and carboxymethyl cellulose (CMC), thereby making it possible to provide a sodium secondary cell having even greater electrode performance.

Description

technical field [0001] The invention relates to a sodium secondary battery electrode and a sodium secondary battery. Background technique [0002] As secondary batteries, lithium secondary batteries have been put into practical use as small power sources such as mobile phones and notebook personal computers, and can also be used as large power sources such as power sources for electric vehicles, hybrid vehicles, etc., and power sources for distributed storage. use, so its demand is increasing. [0003] However, in lithium secondary batteries, raw materials containing expensive rare metal elements such as lithium are often used in the manufacture of its constituent materials, so the supply of the raw materials used to cope with the increased demand for large-scale power supplies is difficult. Said it was worrying. [0004] In view of this, studies on sodium secondary batteries have been conducted as secondary batteries that can solve the above-mentioned supply concerns. In...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/134H01M4/36H01M4/40H01M4/485H01M4/505H01M4/525H01M4/62H01M10/054H01M10/0569
CPCH01M4/04H01M4/0404H01M4/043H01M4/0471H01M4/134H01M4/381H01M4/387H01M4/40H01M4/485H01M4/505H01M4/525H01M4/622H01M4/623H01M4/625H01M10/054H01M10/0569Y02E60/10H01M4/36H01M4/38
Inventor 驹场慎一薮内直明村田涉石川彻松浦祐多久世智
Owner TOKYO UNIVERSITY OF SCIENCE
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