Application method of hard carbon negative electrode material in sodium-ion battery

The technology of a sodium ion battery and its application method, which is applied in the field of sodium ion batteries, can solve the problems of ignoring the influence of the formation of the interface film on the electrochemical performance and the low electrochemical performance of the battery, so as to achieve the advantages of electric charge transmission, excellent rate performance, and small battery capacity. Effect of Polarization Voltage

Inactive Publication Date: 2020-08-28
SHANDONG UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Most of the existing research on hard carbon materials is the use of hard carbon synthesized in the laboratory, and there is little use and research on commercial hard carbon materials. At the same time, the use of hard carbon materials in batteries ignores the formation of interfacial films and the impact on electrochemical processes. Influenced by performance, the electrochemical performance of the obtained battery is not high

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  • Application method of hard carbon negative electrode material in sodium-ion battery
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Examples

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Embodiment 1

[0036] The application method of hard carbon negative electrode material on sodium ion battery, this application method comprises:

[0037] (1) Negative plate preparation: mix hard carbon material, acetylene black, binder sodium alginate (SA) and SBR in a mass ratio of 8:1:1, then add water, ball mill into slurry, and coat on On copper foil, after coating, vacuum-dry at 60°C, roll and press after drying, and cut into negative electrode sheets, the mass of active material per unit area is 1.5-2.0mg cm -2 .

[0038] (2) Preparation of positive electrode sheet: mix the active material, conductive agent, and binder at a mass ratio of 8:1:1, then add nitrogen-methylpyrrolidone (NMP), ball-mill it into a slurry, and coat it on aluminum foil. After coating, dry it in vacuum at 80°C, roll it after drying, and cut it into pole pieces. The mass of active material per unit area is 4.0-5.0 mg cm -2 .

[0039] (3) Battery assembly: including the positive electrode sheet (Na sheet and Na...

experiment example 1

[0047] Electrochemical performance and mechanism test

[0048] Example 1 and Comparative Examples 1-3 were tested for the first-cycle coulombic efficiency, as can be seen from the first-cycle coulombic efficiency, the hard carbon material in NaPF 6 -The first effect in DGM electrolyte is higher than that in NaClO 4 -EC / DEC electrolyte, NaClO 4 -DGM electrolyte and NaPF 6 -EC / DEC electrolyte.

[0049] figure 2 It is the experimental example 1 of the present invention in NaPF 6 -Charge-discharge curve and in-situ XRD diffraction pattern diagram of the electrochemical reaction mechanism in the DGM electrolyte; a is the charge-discharge curve, b is the in-situ XRD diffraction pattern diagram, it can be seen from the figure that there is no diffraction during the discharge process The change of the peak indicates that only the adsorption of sodium ions has occurred. With the gradual decrease of the potential, there is a new peak Na x The formation of C indicates that the har...

experiment example 2

[0051] Formation mechanism and control of SEI film

[0052] From the NMR spectra, it can be seen that image 3 a is the change of F1s energy spectrum during the discharge process, indicating that NaPF under OCV 6 React with water to produce NaF, when discharged to 0.01V, NaPF 6 Decomposition produces Na x PF y o z . image 3 b is during discharge 1 The change of H spectrum, it can be seen that in the whole discharge process, DGM has not changed, and at the same time and figure 1 Corresponding to the high first-cycle Coulombic efficiency, we found that by adjusting the concentration of the electrolyte, the thickness of the SEI film can be controlled, such as Figure 4 As shown, as the electrolyte concentration increases, the SEI film becomes thicker and thicker.

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Abstract

The invention relates to an application method of a hard carbon negative electrode material in a sodium ion battery. According to the invention, commercial hard carbon is selected as a negative electrode material of a sodium-ion battery, NaPF6-DGM is used as an electrolytic solution, Celgard 2325 is used as a diaphragm, and the formed sodium ion battery has low polarization voltage and excellent cycle rate performance in the aspect of electrochemical property, has high first effect and coulombic efficiency, takes high capacity and long service life into consideration, and still has the capacity of 224.4 mAh g<-1> after being circulated 3500 circles under the current density of 1 A g<-1>.

Description

Technical field: [0001] The invention provides an application method of a hard carbon negative electrode material on a sodium ion battery, and belongs to the technical field of the sodium ion battery. Background technique: [0002] Lithium-ion batteries (LIBs) have received widespread attention as a new type of energy storage equipment (Adv. Mater. 2018, 30, 1800561). However, with people's demand for large-scale energy storage equipment, the lack of lithium resource content and high price limit the development of lithium-ion batteries in large-scale energy storage equipment. Relatively speaking, although the energy density of sodium-ion batteries (NIBs) is low, it is abundant in nature and has similar chemical properties to lithium. The composition and principle of sodium-ion batteries and lithium-ion batteries are similar, and aluminum foil can be used as a current collector. , which reduces the assembly cost, is more and more favored by scientific researchers. However, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/587H01M10/0568H01M10/0569H01M2/16H01M4/04H01M4/1393H01M10/054H01M10/058
CPCH01M4/0404H01M4/1393H01M4/587H01M10/054H01M10/0568H01M10/0569H01M10/058H01M2300/0025H01M50/449Y02E60/10Y02P70/50
Inventor 杨剑潘军钱逸泰
Owner SHANDONG UNIV
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