Sodium ion rechargeable battery and negative electrode active material used for the sodium ion rechargeable battery

A technology of negative active material and positive active material, which is applied in the direction of secondary battery, active material electrode, battery electrode, etc., can solve problems such as difficulty in use, and achieve excellent treatment, excellent potential stability, and excellent secondary battery effects

Inactive Publication Date: 2013-12-11
KYUSHU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it has been found that such a carbon material is difficult to dope and dedope sodium ions. When manufacturing a sodium ion secondary battery, the carbon material that can be used as the negative electrode active material of the lithium ion secondary battery is directly used as the negative electrode active material as described above. use is difficult

Method used

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  • Sodium ion rechargeable battery and negative electrode active material used for the sodium ion rechargeable battery
  • Sodium ion rechargeable battery and negative electrode active material used for the sodium ion rechargeable battery
  • Sodium ion rechargeable battery and negative electrode active material used for the sodium ion rechargeable battery

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Experimental program
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Effect test

Embodiment 1、2

[0087] (Charge and discharge performance evaluation of the sodium ion secondary battery of the present invention)

[0088] (1) Preparation of negative electrode

[0089] Weigh a glassy carbon material (manufactured by Tokai Carbon, trade name "GC20SS", granular, the average particle diameter of the constituent particles is 12 μm, the particle diameter of all particles is 30 μm or less, and the BET specific surface area is 0.5 μm 2 / g) and polyvinylidene fluoride (PVDF) used as a binder, to form a glassy carbon material: a composition of binder=95:5 (weight ratio), the binder is dissolved in N-methylpyrrolidone (NMP), add glassy carbon material to it to make slurry. The obtained slurry was coated on a copper foil having a thickness of 10 μm as a negative electrode current collector with a doctor blade, and dried with a drier to obtain an electrode sheet. The electrode sheet was punched into a diameter of 1.5 cm with an electrode punching machine to obtain a circular active el...

Embodiment 3

[0104] (Charge and discharge performance evaluation of sodium ion secondary battery)

[0105] (1) Synthesis of positive active material

[0106] In a glove box with argon atmosphere, weigh Na 2 o 2 (manufactured by Fluka Chemie AG) and Fe 3 o 4 (Aldrich Chemical Company, Inc.), so that Na and Fe form NaFeO 2 stoichiometric ratio, followed by thorough mixing with an agate mortar. The obtained mixture was put into an alumina crucible, placed in an electric furnace, kept at 650° C. for 12 hours, and taken out to obtain a positive electrode active material MC1 for a sodium ion secondary battery.

[0107] (2) Production of positive electrode

[0108] The positive electrode active material MC1 obtained in the above (1) and the conductive material were weighed so as to have a composition of 70:25, and mixed with an agate mortar to obtain a mixture X. After that, polyvinylidene fluoride (PVDF) as a binder was weighed to form a composition of MC1:conductive material:binder=70:25...

Embodiment 4、5

[0125] Except for Tokai Carbon (GC10 (trade name) granular, the average particle size of the constituent particles is 6 μm, the particle size of all particles is 20 μm or less, and the BET specific surface area is 1 m 2 / g) as the glassy carbon material is used for the negative electrode active material, except making the negative electrode EA4 as working pole, make test cell TB4 (embodiment 4, electrolytic solution is 1MNaClO 4 / PC), TB5 (embodiment 5, electrolyte is 1M NaClO 4 / EC+DMC), carry out charge and discharge test.

[0126] The charge and discharge test result of TB4 (embodiment 4) is as Figure 4 As shown, the charge capacity in the first cycle was 279mAh / g, and the discharge capacity was 241mAh / g.

[0127] The charge and discharge test result of TB5 (embodiment 5) is as follows Figure 5 As shown, the charge capacity in the first cycle was 245mAh / g, and the discharge capacity was 181mAh / g.

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Abstract

The invention provided a sodium ion rechargeable battery that can exhibit a very stable potential during the repetition of charge and discharge. The invention also provided a negative electrode active material used for the sodium ion rechargeable battery that can achieve efficient doping and de-doping of sodium ions for use in the sodium ion rechargeable battery. The sodium ion rechargeable battery comprises a positive electrode, a negative electrode and an electrolyte containing sodium ions. The positive electrode comprises a positive electrode active material that can dope and de-dope the sodium ion. The negative electrode comprises a negative electrode active material containing, as a simple substance or as a main component, a vitreous carbon material that can dope and de-dope the sodium ion. In addition, the negative electrode active material for a nonaqueous electrolyte sodium ion rechargeable battery contains a vitreous carbon material as a simple substance or a main component.

Description

technical field [0001] The present invention relates to a sodium ion secondary battery and a negative electrode active material therefor. Background technique [0002] Lithium ion secondary batteries are representative as nonaqueous electrolyte secondary batteries. Lithium-ion secondary batteries are in increasing demand because they can be used as large-scale secondary batteries for automobiles such as electric vehicles and hybrid vehicles, or as large-scale secondary batteries for distributed power storage. However, lithium-ion secondary batteries use a large amount of rare metals such as cobalt, nickel, and lithium as materials. Therefore, there is concern about the supply of these rare metals to meet the increasing demand for large-scale secondary batteries. [0003] On the other hand, a sodium ion secondary battery has been studied as a nonaqueous electrolyte secondary battery that can solve the problem of battery material supply. The sodium ion secondary battery has ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M10/40H01M10/054H01M4/587
CPCH01M4/02H01M4/587H01M10/054H01M2004/021Y02E60/10
Inventor 冈田重人西岛学土井贵之山木准一牧寺雅巳山本武继
Owner KYUSHU UNIV
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