Sodium metal battery and electrochemical device

A sodium metal and battery technology, applied in the field of sodium batteries, can solve the problems of intensifying electrolyte side reactions, consuming active sodium, uneven sodium deposition, etc., achieving the effects of reducing deposition overpotential, ensuring deposition uniformity, and reducing overpotential

Active Publication Date: 2021-09-28
CONTEMPORARY AMPEREX TECH CO
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  • 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 the negative electrode: the negative electrode was prepared by using an aluminum foil with a thickness of 12 um as the negative electrode collector, and the roughness of the negative electrode collector was 0.5 um.

[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 material, use an extrusion coater to coat the surface of the aluminum foil according to the mass requirements per unit area of ​​the positive electrode active material and dry it, and then use a cold press to coat the coated pole piece at a rate of 2.5g / cm 3 The design compaction was carried out by cold pressing to prepare the final positive electrode sheet. The positive electrode materials and coating quality of each emb...

Embodiment 2～3 and comparative example 1～2

[0065] The difference from Example 1 is that adjusting the first Coulombic efficiency of the battery cell changes the design value of the cell, see Table 1 below for details.

Embodiment 4 and comparative example 3～4

[0067] The difference from Example 1 is that the design value of the cell is changed by adjusting the coating quality of the active material, see Table 1 below for details.

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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; 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 larger than or equal to 30 nm. By utilizing the first irreversible capacity of a positive electrode material and the design optimization of a battery cell, after the battery cell is charged and discharged for the first time, the amount of residual sodium metal is enough, so that the sodium deposition layer with a certain thickness can be uniformly formed on the surface of the negative current collector; and therefore, higher nucleation energy required by deposition of sodium to the surface of the current collector in the subsequent charge-discharge cycle process is avoided, the overall deposition overpotential is reduced, and the deposition uniformity of sodium metal and the reversibility of the charge-discharge process are ensured.

Description

technical field [0001] The invention relates to the technical field of sodium batteries, in particular to sodium metal batteries and electrochemical devices. Background technique [0002] 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 also begun to emerge. Sodium-based batteries have gradually attracted attention due to the high enough abundance of sodium in the earth, and have an important strategic position in applications with high cost requirements such as energy storage. Due to the higher reduction potential and larger relative molecular mass of metal sodium relative to metal lithium, the energy density of sodium-ion batteries with similar working principles is significantly lower than that of lithium-ion batteries; the larger ionic radius of sodium ions also makes it in positive and negative When intercalation...

Claims

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Application Information

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