Secondary battery

A secondary battery and electrolyte technology, which is applied to secondary batteries, battery electrodes, circuits, etc., can solve the problems of battery capacity drop and cycle life shortening, and achieve long cycle life, high Coulombic efficiency, and low chemical reactivity Effect

Active Publication Date: 2014-08-06
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the pore structure of vanadium oxide, zinc ions can be inserted and extracted quickly in the vanadium oxide, so this rechargeable zinc ion battery has better charge and discharge performance, but because the vanadium oxide is in the charge and discharge cycle During the process, the structure will undergo irreversible changes, resulting in a decrease in battery capacity and a shortened cycle life.

Method used

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preparation example Construction

[0047] The present invention has no special limitation on the preparation process of the secondary battery electrode, which can be prepared according to conventional processes. When preparing the secondary battery positive pole described in the above technical scheme, the present invention can directly adopt the divalent metal ion ferricyanide complex solid as the positive pole; mixed with water, and then dried to obtain the positive electrode; the mixture of divalent metal ion ferricyanide complex, conductive agent, binder and water can also be coated on stainless steel and other inert materials, and then dried to obtain the positive electrode. When preparing the secondary battery negative electrode described in the above technical scheme, the present invention can directly use metal or metal alloy as the negative electrode; it is also possible to mix the powder of metal or metal alloy, conductive agent, binder and water, and then dry To obtain the negative electrode; the mix...

Embodiment 1

[0054] Weigh 2.68g ZnSO 4 With 1.35g potassium ferrocyanide; the ZnSO 4 It is prepared into an aqueous solution with a concentration of 0.1mol / L, and potassium ferrocyanide is prepared into an aqueous solution of 0.05mol / L; the ZnSO 4 The aqueous solution was slowly added to the potassium ferrocyanide aqueous solution, and after aging for 12 hours, the reaction product was obtained; then the obtained reaction product was cleaned with deionized water, and finally vacuum-dried at 80°C for 12 hours to obtain Zn 3 [Fe(CN) 6 ] 2 solid.

[0055] The above Zn was detected by inductively coupled plasma optical emission spectrometer 3 [Fe(CN) 6 ] 2 The solid is analyzed, and the relative proportion of K, Zn and Fe elements is obtained as K 0.08 Zn 1.44 Fe(CN) 6 .

[0056] The above Zn by X-ray diffractometer 3 [Fe(CN) 6 ] 2 The solid was analyzed to obtain the above Zn 3 [Fe(CN) 6 ] 2 Solid XRD curves, such as figure 1 As shown, curve 1 is the above Zn 3 [Fe(CN) 6 ] ...

Embodiment 2

[0061] 3.75g of zinc powder, 0.75g of acetylene black and 0.5g of polytetrafluoroethylene were stirred evenly, and then coated on a stainless steel mesh with a diameter of 1.3cm and dried in a vacuum to obtain a zinc powder electrode sheet.

[0062]With the zinc powder electrode sheet that above-mentioned makes is negative pole, with the zinc ferricyanide electrode sheet that makes in embodiment 1 is positive pole, with 3mol / LZnSO 4 The aqueous solution is an electrolyte solution, and a zinc ion secondary battery is assembled.

[0063] Carry out charge and discharge performance test to the secondary battery obtained above under 60mA / g constant current, obtain its charge and discharge performance curve, as Figure 4 As shown, curve 1 is the discharge curve, and curve 2 is the charge curve. Depend on Figure 4 It can be seen that the discharge platform of the secondary battery obtained above is as high as 1.75V, which is beneficial to increase the energy density of the battery...

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Abstract

The invention provides a secondary battery. The secondary battery comprises a positive electrode, a negative electrode, and an isolating membrane and electrolyte which are arranged between the positive electrode and the negative electrode; the positive electrode comprises a divalent metal ion iron cyanide complex; the secondary battery adopts the divalent metal ion iron cyanide complex as an positive electrode active material; the divalent metal ion iron cyanide complex is of a rhombohedral structure, belongs to the R-3c space group, and uses (Fe(CN)6) as a structural unit so that a three-dimensional frame network with a special pore passage structure is formed. positive ions can be rapidly embedded into and released from pore passages in a three-dimensional frame, and the three-dimensional frame is stable during embedding and releasing of the positive ions; the secondary battery adopting the divalent metal ion iron cyanide complex as the positive electrode active material has the high coulombic efficiency and the long cycle life; the divalent metal ion iron cyanide complex has the low reaction activity and the prepared battery is difficult to explode.

Description

technical field [0001] The invention belongs to the field of batteries, in particular to a secondary battery. Background technique [0002] Secondary batteries, also known as rechargeable batteries or storage batteries, refer to batteries that can be activated by charging the active material after the battery is discharged and continue to be used. The secondary battery realizes the conversion between electrical energy and chemical energy through the insertion and extraction of metal ions between the positive and negative electrodes. When charging, the metal ions are extracted from the positive electrode and embedded in the negative electrode. positive electrode. [0003] Due to its high energy density and long service life, lithium-ion secondary batteries have been widely used, but due to the high chemical reactivity and low melting point of metallic lithium, it is difficult to withstand accidents or abuse. Lithium metal is prone to violent reactions with electrolyte and a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M4/60
CPCY02E60/122H01M4/60H01M10/0525Y02E60/10
Inventor 陈亮张乐园周旭峰刘兆平
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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