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Novel aqueous copper-bromine secondary battery

A secondary battery, water system technology, applied in the field of electrochemical energy storage, to achieve the effects of excellent rechargeability, low cost, and stable charge and discharge

Inactive Publication Date: 2020-02-21
CHINA TRIUMPH INT ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult to find positive and negative electrode materials with lower price and excellent performance.

Method used

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  • Novel aqueous copper-bromine secondary battery
  • Novel aqueous copper-bromine secondary battery
  • Novel aqueous copper-bromine secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The invention provides a novel aqueous copper-bromine secondary battery, comprising a positive pole, a negative pole and an electrolyte, and the positive pole can realize Br- / Br 2 An electrode material for redox reaction, the negative pole is metal copper, copper alloy or its modification, and the electrolyte contains Cu 2+ and Br- / Br 2 .

[0024] Such as figure 1 As shown, the battery reaction mechanism of the aqueous copper-bromine secondary battery is as follows: the negative electrode of the aqueous copper-bromine secondary battery undergoes reversible deposition and oxidation reaction of copper ions on metal copper or its negative electrode substrate, and the positive electrode bromine ion is adsorbed in a state that can realize Substances that mediate the redox reaction of bromide ions (e.g. figure 1 shown on the surface of the carbon material), and a reversible redox process occurs. By calculating the standard electrode potential of positive and negative reac...

Embodiment 2

[0036] Different concentrations of Br - / Br 2 Aqueous copper bromine secondary battery in aqueous solution:

[0037] Prepare the electrolyte: dissolve 16g of copper sulfate into 30ml of water to prepare a saturated solution of copper sulfate, and then add different masses of NaBr (0.2M, 0.16M, 0.14M, 0.13M, 0.125M, 0.12M, 0.1M, 0.08M, 0.06M, 0M) and Br 2 (respectively 0M, 0.04M, 0.06M, 0.07M, 0.075M, 0.08M, 0.1M, 0.12M, 0.14M, 0.2M), fully stirred to prepare the electrolyte.

[0038] The assembly of the aqueous copper-bromine secondary battery: the shell is made of stainless steel or polymer material, a copper rod is inserted in the middle as the negative electrode, and the copper rod is used as the conductor for drawing the current, and the positive electrode material is a large piece of curled graphite felt (purchased from Dalian Longtian Science and Technology Co., Ltd. ), the electrolyte is each mixed solution prepared above, fills the whole battery system, and the uppe...

Embodiment 3

[0043] Modification of graphite felt:

[0044] The graphite felt is subjected to O-Plasma (oxygen plasma) treatment in a tube furnace filled with an ammonia atmosphere at 1000°C (applying sufficient energy to oxygen to ionize it into a plasma state, using the properties of these active components to treat sample surface).

[0045] The preparation of the electrolyte and the electrical performance test are the same as in the above-mentioned Example 2. The positive electrode material used in the assembly of the aqueous copper-bromine secondary battery is modified graphite felt, and the rest are the same as in the Example 2. The results are shown in Table 2.

[0046] Table 2

[0047]

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Abstract

The present invention relates to a novel aqueous copper-bromine secondary battery, and the battery comprises a positive electrode, a negative electrode and an electrolyte; the positive electrode is anelectrode material capable of achieving a Br- / Br2 oxidation reduction reaction, the negative electrode is metal copper, a copper alloy or a modifier thereof, and the electrolyte contains Cu2+ and Br- / Br2. According to the novel aqueous copper-bromine secondary battery disclosed by the invention, the positive electrode adopts the electrode material with better electrochemical activity, and a soluble redox couple Br- / Br2 is used for reaction on a positive electrode / electrolyte interface; and the negative electrode completes the reversible deposition and oxidation reaction of copper ions on metal copper or a negative electrode substrate thereof. The copper-bromine secondary battery disclosed by the invention is low in cost and has excellent chargeability, cycle life and high-current discharge performance; the stable charging and discharging can be carried out, the capacity can be 190-630 mAhg<-1>, and the capacity retention ratio is 89-93% after 5000 cycles; the energy density of the copper-bromine secondary battery can be 210-690 Whkg<-1>, and the power density of the copper-bromine secondary battery can be 1.78-2.1 kWkg<-1>.

Description

technical field [0001] The invention relates to the field of electrochemical energy storage, in particular to a novel aqueous copper-bromine secondary battery. Background technique [0002] Energy crisis and environmental pollution are issues that humans pay close attention to and urgently need to solve. In recent years, with the development of electric vehicles and grid energy storage, the development of low-cost, high-security, high-energy-density and power-density secondary Batteries are essential. However, the lithium battery has its own safety hazards, high price, and difficulty in fast charging, which limit its wide application in electric vehicles, hybrid electric vehicles and smart grids. Aqueous solutions have the advantages of being cheap, easy to obtain, safe and environmentally friendly. However, the early lead-acid batteries, Ni-Cd batteries, and Ni-MH batteries based on aqueous electrolytes were gradually eliminated due to their low energy density, poor cycle ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/587H01M10/04H01M10/36
CPCH01M10/36H01M4/38H01M4/587H01M10/0422H01M2300/0002H01M2300/0085Y02E60/10Y02P70/50
Inventor 彭寿常郑
Owner CHINA TRIUMPH INT ENG
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