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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

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.
Authors:
ORCiD logo [1] ; ORCiD logo [1] ;  [1] ; ORCiD logo [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Report Number(s):
LA-UR-18-21413
Journal ID: ISSN 2040-3364; NANOHL
Grant/Contract Number:
AC52-06NA25396; AC04-94AL85000
Type:
Accepted Manuscript
Journal Name:
Nanoscale
Additional Journal Information:
Journal Volume: 10; Journal Issue: 16; Journal ID: ISSN 2040-3364
Publisher:
Royal Society of Chemistry
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Silicon; Germanium; Nanowire; Core/shell; intermixing; lithium ion battery anodes; degradation
OSTI Identifier:
1469549
Alternate Identifier(s):
OSTI ID: 1434161

Kim, Dongheun, Li, Nan, Sheehan, Chris J., and Yoo, Jinkyoung. Degradation of Si/Ge core/shell nanowire heterostructures during lithiation and delithiation at 0.8 and 20 A g-1. United States: N. p., Web. doi:10.1039/C8NR00865E.
Kim, Dongheun, Li, Nan, Sheehan, Chris J., & Yoo, Jinkyoung. Degradation of Si/Ge core/shell nanowire heterostructures during lithiation and delithiation at 0.8 and 20 A g-1. United States. doi:10.1039/C8NR00865E.
Kim, Dongheun, Li, Nan, Sheehan, Chris J., and Yoo, Jinkyoung. 2018. "Degradation of Si/Ge core/shell nanowire heterostructures during lithiation and delithiation at 0.8 and 20 A g-1". United States. doi:10.1039/C8NR00865E.
@article{osti_1469549,
title = {Degradation of Si/Ge core/shell nanowire heterostructures during lithiation and delithiation at 0.8 and 20 A g-1},
author = {Kim, Dongheun and Li, Nan and Sheehan, Chris J. and Yoo, Jinkyoung},
abstractNote = {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.},
doi = {10.1039/C8NR00865E},
journal = {Nanoscale},
number = 16,
volume = 10,
place = {United States},
year = {2018},
month = {3}
}