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Sodium metal batteries, electrochemical devices

A sodium metal and battery technology, applied in the field of sodium batteries, can solve the problems of aggravated electrolyte side reactions, consumption of active sodium, uneven sodium deposition, etc., and achieve the effect of reducing deposition overpotential, ensuring deposition uniformity, and reducing overpotential.

Active Publication Date: 2022-05-06
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 batteries, electrochemical devices
  • Sodium metal batteries, electrochemical devices
  • Sodium metal batteries, electrochemical devices

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 present application relates to a sodium metal battery and an electrochemical device. The battery includes a positive pole piece and a negative pole piece. The negative pole piece is a negative current collector. The thickness of the deposited sodium layer is ≥30nm. The present invention utilizes the first irreversible capacity of the positive electrode material and the design optimization of the battery cell. After the battery cell is charged and discharged for the first time, the amount of residual sodium metal is large enough to uniformly form a layer of sodium deposition layer with a certain thickness on the surface of the negative electrode current collector. Avoid the higher nucleation energy required for sodium to deposit on the surface of the current collector during the subsequent charge-discharge cycle, reduce the overall deposition overpotential, and ensure the uniformity of sodium metal deposition and the reversibility of the charge-discharge process.

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 Patents(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
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