Water system rechargeable battery based on copper ferrocyanide positive electrode and phenazine organic matter negative electrode

A technology of copper ferrocyanide and rechargeable batteries, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of poor cycle performance and low specific capacity of rechargeable batteries, and achieve good rate performance, reversible multi-electron redox The effect of original kinetics and high specific capacity

Pending Publication Date: 2022-05-13
CHANGZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the problems of low specific capacity and poor cycle performance of the existing water-based rechargeable batteries using inorganic negative electrode materials, and provide a high specific capacity battery composed of copper ferrocyanide positive electrode material and phenazine organic negative electrode material. Aqueous rechargeable battery system

Method used

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  • Water system rechargeable battery based on copper ferrocyanide positive electrode and phenazine organic matter negative electrode
  • Water system rechargeable battery based on copper ferrocyanide positive electrode and phenazine organic matter negative electrode
  • Water system rechargeable battery based on copper ferrocyanide positive electrode and phenazine organic matter negative electrode

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Embodiment 1

[0034] Prepare 50mL 25mM K at room temperature 4 Fe(CN) 6 Solution (containing 1% hydrochloric acid by mass percentage), prepare 50mL50mM CuCl 2 solution (containing 1% hydrochloric acid by mass percentage). The above K 4 Fe(CN) 6 solution and CuCl 2 The solution was added dropwise at a uniform speed into a vigorously stirred 1% hydrochloric acid solution (20 mL) by mass, then the temperature was raised to 60° C., and the reaction was stirred for 3 hours. Subsequently, the reaction solution was aged at room temperature for 260 hours. The product was separated by high-speed centrifugation and washed several times with deionized water and ethanol. The collected solid was vacuum dried at 60°C for 12 hours to obtain a copper ferrocyanide material.

[0035] figure 1 and figure 2 SEM and TEM images of copper ferrocyanide material, respectively.

[0036] image 3 Is the infrared spectrum of copper ferrocyanide material. 2109cm -1 The infrared absorption at is derived fr...

Embodiment 2

[0047] Embodiment 2: with the K in embodiment 1 4 (EN) 6 Change to Na 4 (EN) 6 . All the other are identical with embodiment 1. The chemical formula of copper ferrocyanide obtained by ICP-AES analysis is K 0.38 Cu 1.78 Fe(CN) 6 . The discharge specific capacity of copper ferrocyanide at 2A / g is 72.6mAh / g.

Embodiment 3

[0048] Embodiment 3: take the copper ferrocyanide of embodiment 1 as positive electrode material to prepare positive electrode sheet, according to copper ferrocyanide: Ketjen black: the ratio of polytetrafluoroethylene=70:20:10 mixes evenly, adds to An aqueous solution of isopropanol, ultrasonically dispersed to form a homogeneous slurry. The slurry is coated on a porous carbon felt to form a positive electrode sheet.

[0049] Prepare the negative electrode sheet with tetrapyridine phenazine as the negative electrode active material, according to active material (tetrapyridine phenazine): conductive carbon material (Ketjen Black, Ketjen Black): binder (perfluorosulfonic acid ionomer, Nafion )=50:40:10 ratio of uniform mixing, adding to the aqueous solution of isopropanol, ultrasonic dispersion to form a uniform slurry. The slurry is coated on carbon paper to form a negative electrode sheet. Glass fiber membrane GF / D is the diaphragm, 1mol / L KCl+0.5mol / L NH 4 The Cl mixed so...

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Abstract

The invention belongs to the field of new energy, and particularly relates to an aqueous rechargeable battery based on a copper ferrocyanide positive electrode and a phenazine organic matter negative electrode. The positive electrode adopts copper ferrocyanide with a metal organic framework structure, the negative electrode is an electroactive conjugated phenazine compound capable of reversibly storing cations, the supporting electrolyte solution is an aqueous solution of soluble salt with ionic conductivity, and the positive electrode and the negative electrode are separated by using a porous membrane or an ion exchange membrane; the charge-discharge process relates to reversible transfer of two or more cations between two poles. The battery system has the advantages of high discharge voltage platform, high specific capacity, long service life, environmental protection and the like, and can provide a low-cost, safe and reliable electrochemical energy storage scheme for large-scale power storage of renewable energy sources.

Description

technical field [0001] The invention belongs to the field of new energy, and in particular relates to a water-based rechargeable battery based on a copper ferrocyanide positive electrode and a phenazine organic compound negative electrode. Background technique [0002] Aqueous rechargeable batteries have attracted extensive attention due to their high ionic conductivity, intrinsic safety, and cost advantages of aqueous electrolytes [Nat.Energy 2019,4,495; Chem 2020,6,2442; J.Mater.Chem.A 2020,8, 26013; CN 105047933A]. [0003] However, although commercial water-based rechargeable batteries such as lead-acid batteries and nickel-metal hydride batteries have high safety and reliability, they generally have problems such as low energy density, short cycle life, and self-discharge [Nano Res.2020, 13, 676 ]. Therefore, there is an urgent need to develop new aqueous rechargeable battery systems with high performance and durability. [0004] Anode materials for aqueous rechargea...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): H01M4/58H01M4/60H01M4/62
CPCH01M4/58H01M4/5825H01M4/60H01M4/625Y02E60/10
Inventor曹剑瑜张文飞许娟
OwnerCHANGZHOU UNIV