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Bimetallic hot regeneration amino battery system, flow battery system and use method

A technology of amino batteries and liquid flow batteries, which is applied in the direction of regenerative fuel cells, battery electrodes, fuel cells, etc., and can solve problems such as limiting power density and energy density

Pending Publication Date: 2018-07-24
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, single-metal (Cu, Ag, Co, Ni) thermally regenerative amino batteries (such as US2017 / 0250433A1, WO2016 / 057894A1) have achieved high power densities (115Wm -2 ) output, but its battery voltage does not exceed 0.45V, which fundamentally limits its power density and energy density

Method used

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  • Bimetallic hot regeneration amino battery system, flow battery system and use method
  • Bimetallic hot regeneration amino battery system, flow battery system and use method
  • Bimetallic hot regeneration amino battery system, flow battery system and use method

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Experimental program
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Effect test

Embodiment 1

[0096] like figure 1As shown in (a), the monometallic thermally regenerative amino battery (TRAB) only includes the discharge process and thermal regeneration process, but the discharge voltage is very low. When the metal silver Ag is used as the electrode, the highest voltage is only 0.45V; the bimetallic thermal regeneration Although the amino battery (B-TRAB) needs to be charged, it has two thermal regeneration processes, which can recover more waste heat energy; and the charging voltage is much lower than the discharging voltage. The discharge voltage of Ag / Zn-TRAB can reach 1.84V, while the charge voltage is only 1.13V; the discharge voltage of Cu / Zn-TRAB can reach 1.38V, while the charge voltage is only 0.72V. Similarly, Ag / Ni-TRAB, Ag / Co-TRAB, Ag / Cu-TRAB, Cu / Ni-TRAB, Cu / Co-TRAB, etc. also belong to the category of bimetallic thermally regenerative amino batteries (B-TRAB).

[0097] Battery device: such as figure 1 As shown in (b), a single Cu-Zn thermally regenerative...

Embodiment 2

[0118] The theoretical discharge voltage of Ag / Zn-TRAB can reach 1.84V, while the charging voltage is only 1.13V. Replace copper grid electrodes with silver electrodes (thickness 0.2mm, 0.8cm×2cm), 0.1M Ag + / Zn 2+ , 3M NH 4 NO 3 , 2M NH 3 As an electrolyte, a discharge polarization test was performed. like Figure 9 As shown in (a), the maximum power density of Ag / Zn-TRAB reaches 1175W m -2 , which is more than twice that of Cu / Zn-TRAB under the same concentration conditions, and there is a possibility of further optimization. like Figure 9 As shown in (b), the anode potential of Ag / Zn-TRAB is lower than that of Cu / Zn-TRAB, which may be due to the anion (NO 3 - , SO 4 2- ), Zn will form a passivation film ZnO / Zn(OH) on the surface during the anode process 2 , so that the pH near the electrode surface decreases, thereby reducing the surface NH 3 concentration. Different anions have a decisive influence on the difficulty of breaking the passivation film, SO 4 2...

Embodiment 3

[0120] like Figure 10 As shown in (a) and 10(b), a single Cu-Zn thermally regenerative ammonia flow battery (Cu / Zn-TRAFB) consists of a positive electrode (copper plate, 50×50×0.5 mm, McMaster-Carr), a negative electrode (zinc plate , 50×50×0.5mm, McMaster-Carr), anion membrane (AEM, Selemion AMV, Japan; effective surface area is 8cm 2 ) and positive and negative flow channels (thickness 1.5mm, cross-sectional area 2×4cm, high-purity silica gel, McMaster-Carr), the flow paths of cathode and anode liquid during charging and discharging are as follows: Figure 10 (c) and 10(d). From the outside to the inside, the flow battery module is fixed and sealed by compression of polycarbonate (PC) end plates, polytetrafluoroethylene blocks and single-sided adhesive silicone plates, as well as bolts and nuts.

[0121] The construction of two Cu / Zn-TRAFB in series and in parallel is as follows Figure 11 As shown in (a) and 11(b), the middle Cu and Zn electrodes are separated by insula...

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Abstract

The invention discloses a high-voltage discharging and low-voltage charging bimetallic hot regeneration amino battery system for low grade waste heat utilization and a use method. Two different metalscapable of forming an ammonia complex are adopted as electrodes, a metal M1 with negative electrode potential is used as the negative electrode, and a metal M2 with positive electrode potential is used as the positive electrode. One closed cycle consists of a discharging process, a charging process and two hot regeneration processes. Deposition / corrosion reaction cyclically occurs to the electrode M1 / M2 during charging / discharging, the separation of NH3 can convert waste heat energy into chemical energy, and then the chemical energy can be converted into electric energy. The discharging voltage is greatly enhanced, and then the power density and energy density of a heat regenerated battery. The discharging voltage is greater than the charging voltage, so that the heat regenerated batterycan have high coulomb efficiency, energy efficiency and voltage efficiency. The invention also discloses a bimetallic hot regeneration amino flow battery system that can enable a compact battery structure and continuous charging and discharging and the use method thereof.

Description

technical field [0001] The invention belongs to a thermal-electrochemical system, and in particular relates to a high-voltage discharge and low-voltage charge bimetal thermal regeneration amino battery system, a liquid flow battery system and a use method. Background technique [0002] A large amount of low-grade waste heat energy exists in industrial production, geothermal energy, and solar energy. Converting these low-grade waste heat energy into electrical energy is an energy-saving and environmentally-friendly technical means. Solid-state thermoelectric generators based on semiconductor materials can directly convert thermal energy into electrical energy, but their material costs are high and electrical energy cannot be stored. Liquid thermal regenerative batteries or cycles can store electrical energy with low cost. Thermal regenerative batteries or cycle technologies based on Seebeck effect and salt concentration difference can complete high-efficiency thermoelectric c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M8/04298H01M8/18
CPCH01M4/86H01M4/8647H01M8/04298H01M8/182Y02E60/50
Inventor 王伟光田华舒歌群霍东兴
Owner TIANJIN UNIV
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