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Negative pole piece of sodium ion battery, electrochemical device and electronic equipment

A technology of sodium-ion batteries and negative pole pieces, applied in the field of energy storage, can solve the problems of sodium-ion batteries that are difficult to realize commercial application, poor chemical stability, and easy to produce dendrites, etc., to achieve the suppression of the formation of sodium dendrites, high safety performance, the effect of reducing the overpotential

Pending Publication Date: 2022-07-05
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the poor chemical stability of sodium metal in air, low melting point (98°C), and the tendency of sodium metal to generate dendrites during electrochemical cycling, it is difficult to realize commercial application of sodium ion batteries.

Method used

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  • Negative pole piece of sodium ion battery, electrochemical device and electronic equipment
  • Negative pole piece of sodium ion battery, electrochemical device and electronic equipment
  • Negative pole piece of sodium ion battery, electrochemical device and electronic equipment

Examples

Experimental program
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Effect test

preparation example Construction

[0049] As an optional technical solution of the present application, the preparation method of the above-mentioned negative pole piece comprises the following steps:

[0050] The carbon material is put into a mixed solution of concentrated sulfuric acid and concentrated nitric acid with a volume ratio of 3:1 and stirred for 1 to 6 hours, and the reaction time is controlled to control the oxygen content;

[0051] The reacted carbon material was washed with deionized water, filtered, put into an oven, and dried at 80°C;

[0052] The dried carbon material and polymer binder are added to the solvent and stirred into a uniform slurry, so that the slurry is coated on the negative electrode current collector (specifically, copper / aluminum foil), and dried to obtain a pole piece; wherein , the solvent can be selected from at least one of water, acetone, N-methylpyrrolidone, dimethylformamide, and ethanol;

[0053] The pole piece is put into a physical vapor deposition device, and a u...

Embodiment

[0072] The following examples describe the disclosure of the present application in more detail, and these examples are provided for illustrative purposes only, as various modifications and changes within the scope of the disclosure of the present application will be apparent to those skilled in the art. Unless otherwise stated, all parts, percentages, and ratios reported in the following examples are on a weight basis, and all reagents used in the examples are either commercially available or synthesized according to conventional methods, and can be directly Used without further processing, and the instruments used in the examples are commercially available.

[0073] 1) Preparation of positive electrode sheet

[0074] 10wt% polyvinylidene fluoride binder was fully dissolved in N-methylpyrrolidone, 10wt% carbon black conductive agent and 80wt% Na were added. 4 Fe 3 (PO 4 ) 2 (P 2 O 7 ) The positive electrode active material is made into a uniformly dispersed positive ele...

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Abstract

The invention provides a negative electrode piece of a sodium ion battery, an electrochemical device and electronic equipment, the negative electrode piece comprises a negative electrode current collector, a carbon material coating formed on at least part of the surface of the negative electrode current collector, and a sodium metal layer formed on at least part of the surface, far away from the negative electrode current collector, of the carbon material coating, the thickness of the carbon material coating is smaller than or equal to 10 microns, the carbon material coating comprises a carbon material and a polymer binder, the carbon material comprises oxygen-containing groups, and the mass content of oxygen atoms in the carbon material is larger than or equal to 0.1%. According to the negative pole piece of the sodium ion battery provided by the invention, when the negative pole piece is charged for the first time, the metal sodium is deposited on the surface of the negative current collector, the metal sodium formed by deposition can be attached to the carbon material coating on the surface of the negative current collector, and the carbon material coating can effectively reduce the overpotential of sodium metal deposition and inhibit the formation of sodium dendrites; and the cycle performance of the battery is improved.

Description

[0001] This application is a divisional application based on the invention application with the application number of 202110742798.7, the application date of June 26, 2021, and the invention title of "Negative pole piece, electrochemical device and electronic equipment of sodium ion battery". technical field [0002] The present application relates to the technical field of energy storage, and in particular, to a negative pole piece, an electrochemical device, and an electronic device of a sodium ion battery. Background technique [0003] With the increasingly prominent energy and environmental issues, the new energy industry has received more and more attention. Lithium-ion batteries have been widely used as an important new energy storage device in recent years due to their high energy density and good cycle performance. However, due to the scarcity of active material resources related to lithium-ion batteries, the cost of batteries is always high, and at the same time, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/133H01M4/62H01M4/583H01M10/054
CPCH01M4/133H01M4/622H01M4/583H01M10/054H01M2004/027Y02E60/10H01M4/366H01M4/663H01M4/1393H01M4/66H01M4/0404H01M4/667H01M4/625H01M4/134H01M10/052
Inventor 曾毓群
Owner CONTEMPORARY AMPEREX TECH CO
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