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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 the problems of low energy density, slow speed, etc., to increase capacity, reduce irreversible losses, and improve primary The effect of efficiency and energy density

Active Publication Date: 2021-07-09
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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  • Sodium ion battery and preparation method thereof

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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 invention discloses a sodium ion battery and a preparation method thereof, and belongs to the technical field of sodium ion batteries. The preparation method comprises the following steps: providing a to-be-formed sodium ion battery and carrying out gradient formation on the to-be-formed sodium ion battery to obtain the sodium ion battery. The gradient formation comprises a plurality of charging and discharging steps, and the to-be-formed sodium ion battery is charged and discharged at different temperatures. According to the preparation method, the interlayer structure of hard carbon can be improved, the sodium ion storage capacity is improved, the migration speed of sodium ions in the hard carbon structure is increased, the sodium death phenomenon in hard carbon micropores is effectively reduced, and the first effect and the energy density of the sodium ion battery are improved.

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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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