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A kind of sodium ion battery and preparation method thereof

A sodium-ion battery and battery internal resistance technology, applied in the manufacture of electrolyte batteries, secondary batteries, non-aqueous electrolyte batteries, etc., can solve problems such as slow speed and low energy density, reduce irreversible losses, increase capacity, and accelerate migration speed effect

Active Publication Date: 2022-04-22
SHANDONG YUHUANG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with lithium-ion batteries, sodium-ion batteries have a lower energy density, which makes their large-scale commercial application slower. How to improve the energy density of sodium-ion batteries has increasingly attracted extensive attention from researchers.

Method used

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  • A kind of sodium ion battery and preparation method thereof

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Experimental program
Comparison scheme
Effect test

preparation example Construction

[0067] The preparation method of the sodium ion battery to be formed may further comprise the steps:

[0068] In the preparation of sodium ion batteries, the positive electrode material is sodium ion transition metal oxide, and the negative electrode material is biomass hard carbon. The sodium salt in the sodium salt electrolyte is sodium hexafluorophosphate, and the solvent is EC / DEC / PC. Dry membrane.

Embodiment 1

[0070] (1) Prepare a sodium ion battery to be formed, wherein the negative pole of the sodium ion battery is hard carbon, the positive pole is a sodium ion oxide, the electrolyte is a sodium salt electrolyte, and the sodium salt in the sodium salt electrolyte is sodium hexafluorophosphate, and the solvent It is dimethyl carbonate, the cation is nickel ion, and the anion is phosphate ion;

[0071] (2) Place the sodium-ion battery to be formed in step (1) at 25°C for 15 hours;

[0072] (3) The first time into:

[0073] S1: At a temperature of 35°C and a pressure of -0.09Mpa, charge the sodium-ion battery in step (2) for 30 minutes at a rate of 0.01C. After charging, lower the battery temperature to 25°C and let it stand for 10 minutes;

[0074] S2: At a temperature of 45°C and a pressure of -0.07Mpa, charge the sodium-ion battery prepared in S1 at a rate of 0.02C for 60 minutes. After charging, lower the battery temperature to 25°C and let it stand for 5 minutes;

[0075] S3: ...

Embodiment 2

[0088] (1) Prepare a sodium ion battery to be formed, wherein the negative pole of the sodium ion battery is hard carbon, the positive pole is a sodium ion oxide, the electrolyte is a sodium salt electrolyte, and the sodium salt in the sodium salt electrolyte is sodium tetrafluoroborate, and the solvent It is ethyl acetate, the cation is copper ion, and the anion is oxygen ion;

[0089] (2) Place the sodium ion battery to be formed prepared in step (1) at 25° C. for 10 h;

[0090] (3) The first time into:

[0091] S1: At a temperature of 25°C and a pressure of -0.09Mpa, charge the sodium-ion battery in step (2) for 40 minutes at a rate of 0.02C. After charging, lower the battery temperature to 25°C and let it stand for 8 minutes;

[0092] S2: At a temperature of 49°C and a pressure of -0.07Mpa, charge the sodium-ion battery prepared in S1 at a rate of 0.05C for 60 minutes. After charging, lower the battery temperature to 25°C and let it stand for 8 minutes;

[0093] S3: At a...

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Abstract

The application discloses a sodium ion battery and a preparation method thereof, belonging to the technical field of sodium ion batteries. The preparation method includes providing a sodium-ion battery to be formed and performing gradient formation on the sodium-ion battery to be formed to obtain the sodium-ion battery. The gradient formation includes multiple charging and discharging steps. Sodium-ion batteries charge and discharge. The preparation method can improve the interlayer structure of hard carbon, improve the ability to store sodium ions, accelerate the migration speed of sodium ions in the hard carbon structure, effectively reduce the occurrence of dead sodium in hard carbon micropores, and improve the performance of sodium ion batteries. First effect and energy density.

Description

technical field [0001] The application relates to a sodium ion battery and a preparation method thereof, belonging to the technical field of sodium ion batteries. Background technique [0002] Na-ion battery is a new type of secondary energy storage battery, which has the advantages of low raw material cost and high safety performance, and has broad prospects for large-scale energy storage applications. The ionic radius of sodium ions is larger than that of lithium ions, which makes graphite no longer suitable as a negative electrode material for batteries, while hard carbon has a large interlayer spacing and abundant micropores, making it the first choice for the main material of negative electrodes for sodium-ion batteries. [0003] There are two ways to store sodium ions in hard carbon, one is intercalation and the other is pore filling. Pore filling is the main reason affecting the first efficiency of sodium ion batteries. How to increase the filling degree while reducin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/054H01M10/058H01M10/44
CPCH01M10/054H01M10/058H01M10/443H01M10/446Y02P70/50Y02E60/10
Inventor 张立君时爽二戚昌伟马春响王瑛
Owner SHANDONG YUHUANG NEW ENERGY TECH
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