Observation of reversible pore change in mesoporous tin phosphate anode material during Li alloying/dealloying
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- Observation of reversible pore change in mesoporous tin phosphate anode material during Li alloying/dealloying
- Kim, Hansu; Park, Gyeong-Su; Kim, Eunjin; Kim, Jinyoung; Doo, Seok-Gwang; Cho, Jaephil
- Lithium alloying; Nanocrystals; Pore expansion; Porewall size
- Issue Date
- ELECTROCHEMICAL SOC INC
- JOURNAL OF THE ELECTROCHEMICAL SOCIETY, v.153, no.9, pp.A1633 - A1636
- We observed the pore expansion and contraction of mesoporous tin phosphate during Li alloying/dealloying using small-angle X-ray scattering and transmission electron microscopy. As-prepared mesoporous tin phosphate showed pore and porewall sizes of 3 and 2 nm, respectively. During lithium alloying (discharging), pore size was slightly contracted, but porewall size was slightly expanded within the range of 1 nm. However, during lithium dealloying (charging), pore and porewall sizes recovered to their original sizes before cycling. The charged sample had a nanoscale pore (∼3 nm) array with a more or less uniformly sized open-porewall structure of amorphous lithium phosphates with metallic α-Sn face-centered-cubic nanocrystals ∼2 nm in diameter.
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