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vanadium redox flow battery (VRFB)

New ion-exchange membrane to improve VRFB performance

Fri, 11/26/2021 - 09:20 -- Vic
new ion-exchange membrane

Researchers in China have developed a hybrid membrane based on two-dimensional nanohybrid materials to improve the performance of vanadium redox flow batteries (VRFBs).

The team from the Shenzhen Institute of Advanced Technology of the Chinese Academy of Sciences embedded graphene oxide (GO) nanosheets in the perfluorinated sulfonic acid (PFSA) matrix to act as a ‘barrier’ to reduce vanadium ion permeation.

Tungsten trioxide (WO3) nanoparticles were grown on the surface of the GO nanosheets to overcome the electrostatic effect and enhance the hydrophilicity and dispersibility of the GO nanosheets.

Severe vanadium ion permeation of the PFSA ion-exchange membrane (IEM) used in most VRFBs will shorten the life of the cell and cause unsatisfactory cell performance.

The team was led by professor Huiyun Li, professor Shuhui Yu and doctor Jiaye Ye.

The study was published in the journal Advanced Functional Materials in November.

Doctor Ye, the first author of the study, said: "These hydrophilic tungsten trioxide nanoparticles on GO nanosheet surfaces serve as proton active sites to facilitate proton transportation."

The sheets were embedded into a novel PFSA membrane with a sandwich structure, that had also been reinforced for stability, with a thin layer of polytetrafluoroethylene (PTFE). This enabled the graphene oxide sheets to act as a barrier, reducing the permeation of vanadium ions.

The nanoparticles also served as active sites to promote the transport of protons, making for a high coulombic efficiency (>98.1%) and high energy efficiency (>88.9%).

The authors say this exceeds the efficiencies of commercially available membranes, while also addressing the stability issue. The team says the experiments indicate the hybrid membrane is highly suited to vanadium redox flow batteries.

In a previous study, published in Chemical Engineering Journal, the research team developed a sandwich structure composite membrane based on one-dimensional functionalised silicon carbide nanowires.

The researchers introduced functionalised silicon carbide nanowires in a PFSA matrix and sandwiched an ultrathin porous PTFE layer.

This hybrid membrane not only maintains good proton conductivity but also effectively reduces the penetration of vanadium ions, thus improving the performance of the VRFB cell.

These studies provide a preparation strategy for designing high-performance IEMs for VRFBs based on one-dimensional and two-dimensional modified materials, which can be extended to other fields including water treatment and fuel cells.

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AVL deals to deploy vanadium redox flow batteries and manufacturer materials in Australia

Thu, 11/18/2021 - 14:29 -- Paul Crompton

Australian Vanadium, in conjunction with its 100% owned subsidiary VSUN Energy, has signed a non-binding sales and materials memorandum of understanding (MOU) with Spanish vanadium redox flow battery (VRFB) manufacturer E22. 

The MOU includes sales of E22’s VRFBs in Australia, vanadium pentoxide offtake arrangements to support E22’s global VRFB sales, and vanadium electrolyte manufacture and supply in Australia. 

The two year MOU has an option to renew for a further 12 months by agreement in writing, with a 30-day notice period on either side for termination. 

Australian Vanadium’s managing director, Vincent Algar said: “What attracted us to E22 in particular was the mid-size VRFB that they are able to supply. 

“Small to medium sized commercial applications, in addition to mining and agricultural industries, require a system that is smaller than the majority of the VRFB manufacturers currently supply. 

“The requirement is for a robust and reliable system that can be increased in size and redeployed as needed.” 

VSUN Energy’s standalone power system (SPS) forms part of the project partly funded through the Modern Manufacturing Initiative (MMI) Australian Government grant that AVL was awarded in July 2021. 

The MMI grant also includes funding towards the build of a 33MWh annual capacity vanadium electrolyte manufacturing facility in Western Australia. 

Primero Group has been engaged for early contractor involvement in the plant build2 which is to be based on technology licensed from U.S. Vanadium LLC3. 

Installing a VRFB

AVL has signed an agreement to install a standalone power system using a 300kWh VRFB energy storage technology at mining company IGO Limited’s nickel operation in Australia.

The system will deliver power independently to the grid and uses a combination of solar, wind, VRFB from E22 and backup generation from diesel or gas.

Total renewable penetration of 85-90% is being targeted for the trial of the VRFB based system. 

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TNG launches VRFB business arm to capitalise on vanadium mine

Wed, 11/18/2020 - 14:03 -- Paul Crompton

Australian company TNG Limited has established a vanadium redox flow battery (VRFB) business unit as part of its vertical integration strategy for one of its mines in the Northern Territory, Australia.

The launch of the business unit marks a growth and diversification step for the company’s wholly owned Mount Peake Vanadium-Titanium-Iron Project.

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Enerox now 90% owned by investment consortium championing VRFB deployment

Thu, 08/06/2020 - 10:02 -- Paul Crompton

Vertically integrated primary vanadium producer Bushveld Minerals has increased its share capital of vanadium redox flow battery (VRFB) maker Enerox by 65.1% through investment firm Enerox Holdings.

The deal, first announced last December, is part of Bushveld’s goal of generating capital to support the growth of VRFB original equipment manufacturers.

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Saudi and German firms sign JV to build one of world’s biggest VRFB facilities

Thu, 05/14/2020 - 10:16 -- Paul Crompton

Saudi Arabian owned Nusaned Investment and German firm Schmid Group have formed a joint venture to establish a 3GWh vanadium redox flow battery (VRFB) manufacturing facility in the Western Asia kingdom.

The joint venture (JV) between Nusaned Investment (investment firm owned by petrochemical company Sabic) and VRFB company Schmid will focus on manufacturing and developing VRFB systems. 

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Firms sign MoU to develop and commercialise vanadium redox flow batteries

Wed, 02/05/2020 - 15:41 -- Paul Crompton

Minerals firm VanadiumCorp Resource announced a partnership to develop vanadium redox flow battery (VRFB) energy storage systems with Indian company Delectrik Systems.

The memorandum of understanding aims to develop and scale up commercial production of VRFB systems, electrolytes and model application uses.

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Dairy farm to use Australian Vanadium’s redox flow battery to harvest solar power

Tue, 10/22/2019 - 15:40 -- Paul Crompton

Vsun Energy, the wholly owned subsidiary of Australian Vanadium, is set to install a vanadium redox flow battery (VRFB) energy storage system at a dairy farm in Victoria, Australia.

The system will deliver at least four hours of supply while allowing the farm to eventually increase its onsite renewable generation and consumption to 100%.

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