Method for processing negative pole piece, sodium metal negative pole piece and electrochemical device

A technology of negative electrode sheet and processing method, which is applied in the field of secondary batteries, and can solve the problems of unrealistic commercial application, easy generation of sodium dendrites, low melting point, etc.

Active Publication Date: 2022-03-18
CONTEMPORARY AMPEREX TECH CO
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, due to the poor chemical stability of sodium metal in the air, low melting point (98C), and easy formation of sodium dendrites during electrochemical cycling, there are major problems in the preparation process and cycle life of sodium metal anode batteries. Currently unavailable for commercial application

Method used

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  • Method for processing negative pole piece, sodium metal negative pole piece and electrochemical device
  • Method for processing negative pole piece, sodium metal negative pole piece and electrochemical device
  • Method for processing negative pole piece, sodium metal negative pole piece and electrochemical device

Examples

Experimental program
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Embodiment 1

[0084] (1) Preparation of negative electrode sheet:

[0085] S1. Place the negative pole piece 1 in a vacuum chamber 2 through the transmission mechanism, and at the same time place the metal material 6, that is, the zirconium material in a metal vapor generator 4, the density of the zirconium material is 6.49g / cm 3 , with a relative atomic mass of 91. The metal vapor generator 4 is set in the vacuum chamber 2. When the vacuum degree in the vacuum chamber 2 reaches the threshold requirement, the zirconium material continues to melt and evaporate in the metal vapor generator 4 to form a metal vapor 7. The ejection flow rate of the metal vapor 7 The negative electrode sheet 1 was immersed in the metal vapor 7 at 500 ml / min. Among them, the vacuum degree can be realized by the vacuum unit 8, and the vacuum degree is ≤8×10 -2 Pa, the threshold requirement of the vacuum degree can be realized by setting the parameters of the vacuum unit 8 . A porous barrier layer 5 is arranged...

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Abstract

The invention provides a processing method for the negative pole piece, a sodium metal negative pole piece and an electrochemical device. That is, in a vacuum environment, the metal vapor reacts with oxygen, and the metal oxide formed by the reaction is plated on the surface of the sodium metal negative electrode sheet to form a metal oxide protective layer with high mechanical strength and stable chemical properties. The metal oxide protective layer can greatly reduce the phenomenon of low yield and performance deterioration caused by the reaction of sodium metal with air and water during the processing of sodium metal negative electrode sheets. Since the metal oxide has a nanoscale thickness, it can form a corresponding sodium salt with sodium metal under electrochemical conditions, thereby increasing the sodium ion transmission rate on the surface of the sodium metal negative electrode sheet and improving the kinetic performance of the battery. And the metal oxide has high mechanical strength, which can maintain the integrity of the structure when the volume of the sodium metal negative electrode changes during charging and discharging, prevent the direct contact between the sodium metal and the electrolyte to form a large number of sodium dendrites, and improve the battery cycle performance.

Description

technical field [0001] The present application relates to the technical field of secondary batteries, in particular to a processing method for negative pole pieces, a negative pole piece and an electrochemical device. Background technique [0002] 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 battery cost has always been high, and at the same time it is facing serious problems such as the depletion of related active material resources, so it is necessary to develop other low-cost metal ion secondary battery systems. [0003] Sodium-ion batteries have become a hot research direction in recent years due to their advantages such as low cost, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/04H01M4/131H01M4/1391H01M4/38H01M4/48
CPCH01M4/0421H01M4/131H01M4/1391H01M4/381H01M4/483H01M4/0404H01M2004/027Y02E60/10H01M4/661H01M4/74H01M10/052C23C14/08C23C14/0021C23C14/562C23C16/045C23C16/405H01M4/0428H01M4/0471H01M4/134H01M4/1395H01M4/366H01M4/62H01M10/4235H01M2004/021
Inventor 曾毓群
Owner CONTEMPORARY AMPEREX TECH CO
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