A lithium conducting phase (Li₂Te) can obviate need for nanocrystallites in the lithiation/de-lithiation of Germanium
| dc.contributor.advisor | Mullins, C. B. | en |
| dc.contributor.committeeMember | Heller, Adam | en |
| dc.creator | Powell, Emily Janette | en |
| dc.creator.orcid | 0000-0003-4822-5922 | en |
| dc.date.accessioned | 2015-11-02T17:00:12Z | en |
| dc.date.accessioned | 2018-01-22T22:28:44Z | |
| dc.date.available | 2015-11-02T17:00:12Z | en |
| dc.date.available | 2018-01-22T22:28:44Z | |
| dc.date.issued | 2015-08 | en |
| dc.date.submitted | August 2015 | en |
| dc.date.updated | 2015-11-02T17:00:12Z | en |
| dc.description | text | en |
| dc.description.abstract | Mainstream rechargeable lithium battery materials research of the past 20 years has focused on nano-particulate materials, where Li⁺-diffusion lengths exceeded at designated cycling rates the particle radii, and where the particles slipped rather than broke upon their expansion and shrinkage in lithiation/de-lithiation cycles. Here we show that in intrinsically rapidly Li⁺-transporting macrocrystalline germanium and even more so in a dispersion of non-cycling Li₂Te in macrocrystalline germanium it is unnecessary to use nanocrystalline materials and that Li₂Te increases the retained capacity at 1C rate after 500 cycles. Dispersions of 10-30 atom % of crystalline GeTe in 90-70 atom % crystalline Ge were synthesized by quenching from the melt followed by high energy ball milling to 1μm-5μm particle size. The particles, as well as similarly made and similarly sized pure Ge particles were incorporated in electrodes, which were galvanostatically lithiated/de-lithiated. In the initial cycle, GeTe is reduced to Li[subscript x]Ge alloys and Li₂Te. In 500 1C cycles of Li[subscript x]Ge de-lithiation/Ge lithiation the capacity of the pure Ge faded more rapidly than that of the Ge electrodes containing Li₂Te, which retained 94-96 % of their initial capacity after 500 cycles at 1C rate. | en |
| dc.description.department | Chemistry | en |
| dc.format.mimetype | application/pdf | en |
| dc.identifier | doi:10.15781/T26W5S | en |
| dc.identifier.uri | http://hdl.handle.net/2152/32119 | en |
| dc.language.iso | en | en |
| dc.subject | Germanium | en |
| dc.subject | Lithium-ion batteries | en |
| dc.subject | Anode materials | en |
| dc.title | A lithium conducting phase (Li₂Te) can obviate need for nanocrystallites in the lithiation/de-lithiation of Germanium | en |
| dc.type | Thesis | en |