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Aqueous battery

A water-based electrolyte and battery technology, applied in secondary batteries, water-based electrolytes, circuits, etc., can solve the problems of reducing ion diffusion rate and high cost, and achieve the effect of improving electrochemical window, low cost, and improving energy density

Active Publication Date: 2021-07-20
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Existing methods, such as the use of high-concentration salt and the use of electrolyte additives can improve the electrochemical window of aqueous batteries to a certain extent and improve the stability of materials in aqueous solutions, but they often face the problems of high cost and reduced ion diffusion rate

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Preparation of Na by co-precipitation 1.87 mn 0.78 [Fe(CN) 6 ]·2.1H 2 O is used as the positive electrode active material and prepares the positive electrode sheet. The specific preparation process is as follows: 50 milliliters of 0.2mol / L sodium ferrocyanide solution (if no special instructions, all use water as solvent) and 50 milliliters of 0.2mol / L sodium ferrocyanide solution The manganese sulfate solution is injected into 100 milliliters of 0.3mol / L disodium ethylenediaminetetraacetic acid solution at the same time, and at 60°C, the positive active material is obtained through co-precipitation reaction; the positive active material, conductive carbon, and polyvinylidene fluoride are The ratio of 7:2:1 is mixed evenly, and the positive electrode sheet is obtained by stirring, coating, drying, and rolling.

[0051] Assemble the positive pole piece, zinc sheet, and water-based electrolyte into a water-based battery. The solvent in the water-based electrolyte used ...

Embodiment 2

[0058] The preparation of the positive electrode sheet is the same as in Example 1. The positive electrode sheet, zinc sheet, and aqueous electrolyte are assembled into an aqueous battery. The solvent in the aqueous electrolyte used is heavy water, and the solute is 1mol / kg NaCF 3 SO 3 , 0.1mol / kg of Zn(CF 3 SO 3 ) 2 , and 6mol / kg of Na 2 C 4 h 8 o 8 . The battery was cycled for 100 times at a voltage range of 0.2-2.15V and a current of 5C, and the capacity retention rate was 71%.

Embodiment 3

[0060] Preparation of K by ion exchange method 1.77 Fe[Fe(CN) 6 ] 0.94 1.2H 2 O is used as the positive electrode active material and prepares the positive electrode sheet. The specific preparation process is as follows: 50 milliliters of 0.2mol / L potassium ferrocyanide solution (if no special instructions, all use water as solvent) and 50 milliliters of 0.2mol / L potassium ferrocyanide solution Ferrous sulfate solution injects in the disodium edetate solution of 0.3mol / L of 100 milliliters simultaneously, at room temperature obtains positive active material through coprecipitation reaction; Positive active material, conductive carbon, polyvinylidene fluoride are weighed The ratio of 7:2:1 is mixed evenly, and the positive electrode sheet is obtained by stirring, coating, drying, and rolling.

[0061] Assemble the positive electrode sheet, zinc sheet, and water-based electrolyte into a water-based battery. The water-based electrolyte used is heavy water as a solvent, and the...

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Abstract

The invention discloses an aqueous battery which comprises a positive electrode, a negative electrode and an aqueous electrolyte, and the aqueous electrolyte comprises heavy water and salt. According to the invention, the special aqueous electrolyte consisting of heavy water and salt is adopted, so that the electrochemical window of the electrolyte is widened, and the use of a high-voltage electrode material is facilitated, thereby improving the energy density of the battery; meanwhile, in the aqueous electrolyte, the stability of the electrode material is improved, so that the cycle life of the aqueous battery can be prolonged.

Description

technical field [0001] The invention relates to the technical field of energy storage batteries, in particular to an aqueous battery. Background technique [0002] With the consideration of increasingly serious energy and environmental problems, it is imminent to develop clean and renewable energy sources such as solar energy, wind energy, and tidal energy. However, this kind of clean and renewable energy is greatly affected by time and climate, and has disadvantages such as instability, discontinuity, and uncontrollability. To improve the utilization efficiency of this kind of clean energy, high-performance energy storage batteries are needed, among which cheapness and safety are important indicators. [0003] Aqueous batteries have received widespread interest due to their cheapness, safety, and environmental protection. However, the aqueous electrolytes used in them are not conducive to the use of high-voltage electrode materials due to their narrow electrochemical windo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/36
CPCH01M10/36H01M2300/0002Y02E60/10
Inventor 谢健孙云坡许峥赵新兵
Owner ZHEJIANG UNIV