Investigation of Anatase-TiO 2 As an Efficient Electrode Material for Magnesium-Ion Batteries
The advent of lithium-ion electrochemical has ushered in a new era of high energy density rechargeable batteries, with applications ranging from portable electronics to electric vehicles. 1 However, several challenges have stymied the implementation of lithium-ion batteries that approach the thermod...
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| Published in: | Meeting abstracts (Electrochemical Society) 2016-04, Vol.MA2016-01 (2), p.301-301 |
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| Main Authors: | , , |
| Format: | Article |
| Language: | eng |
| Online Access: | Get full text |
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| Summary: | The advent of lithium-ion electrochemical has ushered in a new era of high energy density rechargeable batteries, with applications ranging from portable electronics to electric vehicles.
1
However, several challenges have stymied the implementation of lithium-ion batteries that approach the thermodynamic capacity and energy density limit. This is largely associated with the use of a lithium-metal anode, which under extensive cycling conditions and current densities promotes the formation of dendritic lithium deposits. Lithium dendrites result in the formation of electrochemically “dead” lithium, resulting in poor cycling efficiency.
2
In addition, dendritic lithium has been implicated in the cell shorting and thermal runaway. To mitigate such problems, alternative energy storage systems have been heavily pursued recently, with efforts largely focused on the development of sodium-ion and magnesium-ion electrochemical cells.
3
The implementation of a magnesium metal anode is highly advantageous to lithium, as the volumetric capacity is nearly double (3833 mAh/mL vs. 2062 mAh/mL, respectively) and the deposition morphology is described as non-dendritic.
2
As such, considerable attention has been focused the development of magnesium electrochemical cells utilizing a magnesium metal anode, high capacity cathode, and suitable electrolyte. One of the leading cathode materials is the Chevrel-phase Mo
6
S
8
, introduced in 2000 with an experimentally determined specific capacity of 105 mAh/g.
4
Recently, Sheha described an anatase TiO
2
/ reduced graphene oxide (rGO) composite cathode material was used in a magnesium-ion electrochemical cell utilizing a Mg metal anode and polyvinyl alcohol/ MgBr
2
/ tetraglyme/ H
2
O electrolyte. This cathode was shown to maintain cyclability to fifty cycles. Following this report and the plethora of publications concerning the insertion electrochemistry of anatase-phase titanium dioxide, we decided to investigate the feasibility of TiO
2
/ carbon black/ poly tetrafluoroethylene (PTFE) as an electrode for magnesium-ion batteries.
Herein, we report a study concerning the electrochemistry of Mg/TiO
2
cells as well as a full characterization using spectroscopic and microscopic techniques. Figure 1 shows the voltage profiles of the TiO
2
/Mg coin cell with the All Phenyl Complex (APC) electrolyte between 0.05 and 2.2 V at a current density of 5 μA/ mg. During the first discharge, TiO
2
exhibits a well-defined plateau at approximately |
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| ISSN: | 2151-2043 2151-2043 |