Degradation of Si/Ge core/shell nanowire heterostructures during lithiation and delithiation at 0.8 and 20 A g-1

Kim, Dongheun; Li, Nan; Sheehan, Chris J.; Yoo, Jinkyoung

doi:10.1039/C8NR00865E

Title: Degradation of Si/Ge core/shell nanowire heterostructures during lithiation and delithiation at 0.8 and 20 A g^-1

Journal Article · Wed Mar 28 00:00:00 EDT 2018 · Nanoscale

DOI:https://doi.org/10.1039/C8NR00865E· OSTI ID:1469549

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Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

We report that Si/Ge core/shell nanowire heterostructures have been expected to provide high energy and power densities for lithium ion battery anodes due to the large capacity of Si and the high electrical and ionic conductivities of Ge. Although the battery anode performances of Si/Ge core/shell nanowire heterostructures have been characterized, the degradation of Si/Ge core/shell nanowire heterostructures has not been thoroughly investigated. Here we report the compositional and structural changes of the Si/Ge core/shell nanowire heterostructure over cycling of lithiation and delithiation at different charging rates. The Si/Ge core/shell nanowire heterostructure holds the core and shell structure at a charging rate of 0.8 A g^-1 up to 50 cycles. On the other hand, compositional intermixing and loss of Si occur at a charging rate of 20 A g^-1 within 50 cycles. Lastly, the operation condition-dependent degradation provides a new aspect of materials research for the development of high performance lithium ion battery anodes with a long cycle life.

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Research Organization:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC52-06NA25396; AC04-94AL85000

OSTI ID:: 1469549

Alternate ID(s):: OSTI ID: 1434161

Report Number(s):: LA-UR-18-21413; NANOHL

Journal Information:: Nanoscale, Vol. 10, Issue 16; ISSN 2040-3364

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 13 works

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Title: Degradation of Si/Ge core/shell nanowire heterostructures during lithiation and delithiation at 0.8 and 20 A g-1

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Title: Degradation of Si/Ge core/shell nanowire heterostructures during lithiation and delithiation at 0.8 and 20 A g^-1