Lesson plan
LISICON
LISICON is an acronym for lithium super ionic conductor, which refers to a family of solids with the chemical formula Li 2+2x Zn 1−x GeO 4 . The first example of this structure was discovered in 1977, providing a chemical formula of Li 14 Zn(GeO 4 ) 4 . The crystal structure of LISICON consists of a network of [Li 11 Zn(GeO 4 ) 4 ] 3- as well as 3 loosely bonded Li + . The weaker bonds allow for the lithium ions to easily move from site to site, not needing to break strong bonds to do so. Also, this structure forms large “bottlenecks” between the interstitial positions which these ions occupy, additionally lowering the energy required to move from site to site. These two factors allow for the lithium ions to diffuse quickly and easily through the structure. However, because of the shape of the channels through which these lithium ions can diffuse, they are limited to 2 dimensional diffusion. LISICON compounds have relatively high ionic conductivity, on the order of 10 −6 S/cm at 25 °C. LISICONs readily react with lithium metal and atmospheric gases such as CO 2 ; as a result, their conductivity decreases with time.
Article summary
LISICON is an acronym for lithium super ionic conductor, which refers to a family of solids with the chemical formula Li 2+2x Zn 1−x GeO 4 . The first example of this structure was discovered in 1977, providing a chemical formula of Li 14 Zn(GeO 4 ) 4 . The crystal structure of LISICON consists of a network of [Li 11 Zn(GeO 4 ) 4 ] 3- as well as 3 loosely bonded Li + . The weaker bonds allow for the lithium ions to easily move from site to site, not needing to break strong bonds to do so. Also, this structure forms large “bottlenecks” between the interstitial positions which these ions occupy, additionally lowering the energy required to move from site to site. These two factors allow for the lithium ions to diffuse quickly and easily through the structure. However, because of the shape of the channels through which these lithium ions can diffuse, they are limited to 2 dimensional diffusion. LISICON compounds have relatively high ionic conductivity, on the order of 10 −6 S/cm at 25 °C. LISICONs readily react with lithium metal and atmospheric gases such as CO 2 ; as a result, their conductivity decreases with time.
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Discussion questions
- Summarise the article in your own words. Which single claim would you verify first, and why?
- Which claim in this article is most likely to be revised as the sources update? How would you check its current status?
- If two sources disagreed about one of these facts, what would you need in order to trust one over the other?
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Key claims and bibliography are generated from the same tracked claims and sources as the article page.