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Next Generation Rechargeable Zn-Air Batteries: Sustainable and Abundant Materials
Due to the increased focus on implementing renewable energy and the consequences of the intermittent aspects of these technologies, energy storage has received a lot of attention. Heavy technological progression in recent decades resulted in an apparent solution in the form of batteries. Despite the success of the Li-ion batteries and its variants, there is a push towards developing high capacity, low-cost batteries due to the sheer amount of energy that needs to be stored if the energy sector commits to a full transition to renewable energy generation. A candidate for this role is the Zn-air battery, a battery with high energy density made from cheap and abundant materials that are already available commercially, but only as a primary battery. Aside from difficulties in recharging, the Zn-air batteries suffer form self-corrosion of the anode in alkaline media, dendrite formation. The aim of this thesis was to investigate Zn-air batteries using in situ techniques and thereby provide the information required to meet these challenges. A flow cell setup was developed to investigate dissolution of typical Zn-air anode current collectors. It was found that Ti, Cu, Sn and W are all suitable current collectors in alkaline media. Ti appeared to be the most stable, while Cu, Sn and W all dissolve quickly above the dissolution potential for Zn, with the two latter materials dissolving the fastest. Using a Differential Electrochemical Mass Spectrometer (DEMS), Znair batteries with four different electrolytes were investigated with the goal of correlating electrochemical properties to gas evolution. Electron numbers were determined for a KOH electrolyte and an optimised KOH electrolyte with the additives KF and K2CO3. Furthermore, a ZnCl 2 ¯ electrolyte at pH 8 and a neutral electrolyte composed of Zn(TFSI) and Li(TFSI) were found not to evolve O 2 .Using the same technique, the effect of dopants on the Hydrogen Evolution Reaction (HER) at a Zn surface was investigated. It was determined that a combination of In and Bi was ...
Next Generation Rechargeable Zn-Air Batteries: Sustainable and Abundant Materials
Due to the increased focus on implementing renewable energy and the consequences of the intermittent aspects of these technologies, energy storage has received a lot of attention. Heavy technological progression in recent decades resulted in an apparent solution in the form of batteries. Despite the success of the Li-ion batteries and its variants, there is a push towards developing high capacity, low-cost batteries due to the sheer amount of energy that needs to be stored if the energy sector commits to a full transition to renewable energy generation. A candidate for this role is the Zn-air battery, a battery with high energy density made from cheap and abundant materials that are already available commercially, but only as a primary battery. Aside from difficulties in recharging, the Zn-air batteries suffer form self-corrosion of the anode in alkaline media, dendrite formation. The aim of this thesis was to investigate Zn-air batteries using in situ techniques and thereby provide the information required to meet these challenges. A flow cell setup was developed to investigate dissolution of typical Zn-air anode current collectors. It was found that Ti, Cu, Sn and W are all suitable current collectors in alkaline media. Ti appeared to be the most stable, while Cu, Sn and W all dissolve quickly above the dissolution potential for Zn, with the two latter materials dissolving the fastest. Using a Differential Electrochemical Mass Spectrometer (DEMS), Znair batteries with four different electrolytes were investigated with the goal of correlating electrochemical properties to gas evolution. Electron numbers were determined for a KOH electrolyte and an optimised KOH electrolyte with the additives KF and K2CO3. Furthermore, a ZnCl 2 ¯ electrolyte at pH 8 and a neutral electrolyte composed of Zn(TFSI) and Li(TFSI) were found not to evolve O 2 .Using the same technique, the effect of dopants on the Hydrogen Evolution Reaction (HER) at a Zn surface was investigated. It was determined that a combination of In and Bi was ...
Next Generation Rechargeable Zn-Air Batteries: Sustainable and Abundant Materials
Christensen, Mathias Kjærgård (author)
2018-01-01
Christensen , M K 2018 , Next Generation Rechargeable Zn-Air Batteries: Sustainable and Abundant Materials . Technical University of Denmark , Kgs. Lyngby .
Book
Electronic Resource
English
DDC:
690
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