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Aqueous lithium ion flow battery

A flow battery, lithium ion technology, applied in water-based electrolyte fuel cells, battery electrodes, regenerative fuel cells, etc. High efficiency and energy density, low maintenance, high specific energy effect

Inactive Publication Date: 2015-06-17
NO 63971 TROOPS PLA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the long cycle life of this battery is based on the extremely thin LiMn coating 2 o 4 Electrodes and 4C charge and discharge at a high rate in a short time, such as a decrease in the discharge rate and a prolonged time, will lead to a mismatch between the positive and negative electrodes in the charge and discharge system; and the electrolyte is rich in chloride ions, which has serious corrosion problems
In addition, the above-mentioned aqueous lithium-ion batteries with deposited zinc electrodes as negative electrodes have problems such as zinc dendrites, electrode deformation, and passivation similar to the original solid Zn-Ni secondary batteries, resulting in poor cycle performance.
Therefore, although the above-mentioned aqueous lithium-ion batteries show good application prospects, they are not very suitable for large-scale storage in terms of discharge rate, specific capacity and cycle life.

Method used

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  • Aqueous lithium ion flow battery

Examples

Experimental program
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Effect test

example 1

[0021] Commercial LiMn after ball milling 2 o 4 Mix it with acetylene black and PTFE binder according to the weight ratio of 75:20:5 to make a slurry, press it into a sheet, press it on the foamed nickel current collector at a pressure of 10Mpa, and make an electrode after drying. After pre-charging and discharging, the actual capacity of the positive electrode is 78mAh / g, and the loading capacity of the active material is 11mg / cm 2 . by 1cm 2 The nickel-plated punching steel strip is the base electrode of the negative electrode zinc deposition, 50mL of 1.5M Li 2 SO 4 +1.5M Zn 2 SO 4 The solution (pH 4) is the electrolyte. The MP-10RN magnetic circulation pump is used as the power pump to circulate the electrolyte over the positive / negative electrode surface of the battery. The open-circuit voltage of the battery reaches 2.1V. When charged and discharged at 1C, the average discharge voltage is about 1.7V. The battery performance decay rate is lower than 10% after 1000 ...

example 2

[0023] Commercial carbon-coated LiFePO after ball milling 4 Mix it with 10% graphite powder and 5% PTFE binder to form a slurry, press it into a sheet, press it onto the foamed nickel current collector at a pressure of 10MPa, and make an electrode after drying; 2 The stainless steel mesh is the negative current collector, 50mL of 1.25M ZnSO 4 +2.0M Li 2 SO 4 The solution (pH value is 6) is the electrolyte, and the battery is assembled. The MP-10RN magnetic circulation pump is used to circulate the electrolyte over the positive / negative electrode surface of the battery. After pre-charging and discharging, the actual capacity of the positive electrode is 60mAh / g. The open-circuit voltage of the battery is about 1.20V. When charging and discharging at 1C, the average discharge voltage is about 1.0V. The charging and discharging cycles are 1000 times, and the battery performance decay rate is lower than 5. %.

example 3

[0025] Commercial LiMn after ball milling 2 o 4 Mix it with titanium dioxide powder and PVDF binder according to the weight ratio of 80:10:10 to make a slurry, evenly coat it on the conductive carbon paper, and make an electrode after drying. The active material loading capacity is 12mg / cm 2 . by 1cm 2 The nickel-plated punching steel strip is the base electrode of the negative electrode zinc deposition, 1.5M LiAC+1.5M Zn(AC) 2 The solution (pH 5) is the electrolyte. The MP-10RN magnetic circulation pump is used as the power pump to circulate the electrolyte over the positive / negative electrode surface of the battery. After pre-charging and discharging, the actual capacity of the positive electrode is 90mAh / g. The open-circuit voltage of the battery is 2.0V. When charging and discharging at 1C, the average discharge voltage is about 1.68V. The charging and discharging cycles are 1000 times, and the battery performance decay rate is small. .

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Abstract

The invention relates to a novel aqueous lithium ion flow battery with high performances and low cost. A lithium ion intercalation-deintercalation mechanism and a flow battery metal ion deposition-dissolution mechanism are optically combined in an energy storage device. A positive electrode adopts a lithium ion intercalatable-deintercalatable solid oxide material, a negative electrode adopts a deposition type metal electrode material deposited-dissolved on an inert electrode, an electrolyte is an aqueous electrolyte containing lithium ions and capable of depositing and dissolving metal ions, and the separation of positive electrode and the negative electrode by a diaphragm is not needed. In the charge and discharge process, the electrolyte is promoted by a liquid pump to go through a pipeline and continuously circularly flow between a storage tank and a battery main body. The aqueous lithium ion flow battery has the characteristics of long cycle life, high energy efficiency, safety, low cost, less maintenance, environmental protection, high utilization rate and energy density of active substances, and large specific capacity, and is especially suitable for large scale power storage of off-grid renewable energy power generation and distributed power supply.

Description

technical field [0001] The invention relates to a water-based lithium-ion flow battery, which belongs to the field of battery technology and is applied to large-scale power storage of non-grid-connected renewable energy power generation, distributed power supply in factories, mines, buildings, remote areas, etc., as well as peak shaving and valley addition of power grids. Background technique [0002] With the rapid development of modern industry and economy, the contradiction between energy supply and demand has become increasingly prominent. At the same time, the environmental pollution caused by the use of fossil energy has become more and more serious. To this end, it is necessary to actively develop large-scale power storage technology to meet the energy storage needs of renewable green new energy power generation, build a smart grid, and reduce human dependence on fossil energy. The development of large-scale power storage technology requires a low-cost, safe and envir...

Claims

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Application Information

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IPC IPC(8): H01M8/18H01M4/86
CPCH01M4/86H01M8/08Y02E60/50
Inventor 文越华程杰潘君丽徐艳赵鹏程曹高萍谢自立杨裕生
Owner NO 63971 TROOPS PLA
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