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Sodium metal battery and electrochemical device

A technology of sodium metal and batteries, which is applied in the field of sodium batteries, can solve the problems of consumption of active sodium, uneven sodium deposition, and intensified electrolyte side reactions, etc., so as to ensure the uniformity of deposition, reduce the overpotential, and reduce the effect of deposition overpotential

Active Publication Date: 2022-07-29
CONTEMPORARY AMPEREX TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the deposition of anode-free sodium metal batteries on the surface of the anode current collector requires a higher overpotential, which also easily leads to uneven sodium deposition, which intensifies the side reaction with the electrolyte, greatly consumes active sodium, and ultimately affects the cycle performance of the battery cell.

Method used

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  • Sodium metal battery and electrochemical device
  • Sodium metal battery and electrochemical device
  • Sodium metal battery and electrochemical device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] (1) Preparation of negative electrode: A negative electrode was prepared by using an aluminum foil with a thickness of 12 μm as the negative electrode current collector, and the roughness of the negative electrode current collector was 0.5 μm.

[0059] (2) Preparation of positive electrode: the positive electrode active material NaFeP 2 O 7 , Binder polyvinylidene fluoride (PVdF), conductive agent conductive carbon black (Super-P) according to the mass ratio of 96%: 2%: 2% in N-methylpyrrolidone (NMP) solvent mixed uniformly to prepare positive electrode slurry The aluminum foil is coated on the surface of the aluminum foil according to the quality requirements of the positive electrode active material per unit area by an extrusion coater and dried, and then the coated pole piece is coated at a rate of 2.5g / cm by a cold press. 3 The designed compaction was cold-pressed to prepare the final positive electrode sheet, wherein the positive electrode material and coating qu...

Embodiment 2～3 and comparative example 1～2

[0065] Different from Example 1, adjusting the first coulombic efficiency of the battery cell changes the design value of the cell, as shown in Table 1 below.

Embodiment 4 and comparative example 3～4

[0067] Different from Example 1, the design value of the cell was changed by adjusting the coating quality of the active material, as shown in Table 1 below.

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Abstract

The invention relates to a sodium metal battery and an electrochemical device, the battery comprises a positive pole piece and a negative pole piece, the negative pole piece is a negative current collector, and the thickness of a sodium layer deposited in situ on the negative current collector after the battery is charged and discharged for the first time is greater than or equal to 30nm, the first charge capacity of a positive active material in the positive pole piece is QC mAh / g, the first discharge capacity is QDmAh / g, the coating mass of the positive active material is CW g / cm < 2 >, and the theoretical volume gram capacity of sodium metal is X mAh / cm < 3 >, so that a conductive coating is arranged on at least part of the surface of the negative current collector, and the thickness of the conductive coating is 1-10 microns.

Description

[0001] This application is a divisional application based on the invention application with the application number of 202110742607.7, the application date of June 26, 2021, and the invention name of "sodium metal battery, electrochemical device". technical field [0002] The present application relates to the technical field of sodium batteries, in particular to sodium metal batteries and electrochemical devices. Background technique [0003] With the gradual expansion of the application of lithium-ion battery technology in consumer electronics, electric vehicles, energy storage and other markets, the problem of insufficient lithium resources has begun to emerge. Na-based batteries have gradually attracted attention due to the sufficiently high abundance of sodium on the earth, and have an important strategic position in cost-demanding applications such as energy storage. Subject to the higher reduction potential and larger relative molecular mass of metal sodium relative to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/134H01M4/38H01M4/62H01M10/054
CPCH01M4/134H01M4/381H01M4/624H01M10/054H01M2004/027H01M2004/021Y02E60/10H01M4/667H01M4/668H01M4/661H01M10/0585H01M4/622H01M50/247H01M50/249H01M50/251H01M4/623H01M4/625
Inventor 曾毓群
Owner CONTEMPORARY AMPEREX TECH CO LTD
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