The lithium insertion reactions with tin (II) oxide (SnO) and
tin-based composite oxide (abbreviated as TBCO) are studied by solid
7Li-NMR Knight shift, T1 and T1ρ relaxation rate, TEM and in situ XRD methods. By the insertion reaction for SnO, the lithium oxide and
β-tin are produced first at Li/Sn = 2; at Li/Sn = 3 to 6
the products are not simple and a mixture of LiSn2, LiSn,
Li5Sn2 and Li7Sn2 alloys is detected during
the insertion. For the
TBCO, which is revealed as amorphous, mainly constituted by randomly
distributed very short-range (order of 10-9 m) regions by TEM
observation, it is found that electrochemically inserted lithium forms Li2O
and produces metallic tin (Sn) in the first step (Li/Sn <2), then
the highly ionic lithium-tin alloys, Li7Sn2 (and Li7Si2), are
produced in the second step (Li/Sn >2). During the second step, the
Li/Sn ratio of formed lithium-tin alloy is kept at almost 4. By the analyses
of 7Li NMR Knight shifts, line shape and in situ XRD, the
lithium-inserted TBCOs are characterized as almost amorphous and mixtures of
highly ionic components.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.