Heteroepitaxy-Induced Rutile VO2 with Abundantly Exposed (002) Facets for High Lithium Electroactivity

Sangbaek Park; Chan Woo Lee; Jae Chan Kim; Hee Jo Song; Hyun Woo Shim; Sangwook Lee; Dong Wan Kim

doi:10.1021/acsenergylett.6b00147

Heteroepitaxy-Induced Rutile VO₂ with Abundantly Exposed (002) Facets for High Lithium Electroactivity

Sangbaek Park, Chan Woo Lee, Jae Chan Kim, Hee Jo Song, Hyun Woo Shim, Sangwook Lee, Dong Wan Kim

Research output: Contribution to journal › Article › peer-review

27 Citations (Scopus)

Abstract

Research on VO₂ cathodes for lithium ion batteries has been mainly focused on the VO₂ (B) phase. However, rutile VO₂ (M/R) has rarely been studied because of the intrinsically low lithium activity resulting from the highly anisotropic nature of lithium accommodation. Here, we demonstrate that heteroepitaxial engineering can be an effective strategy for activating the anisotropic electrode and developing kinetically superior electrodes. Appropriate lattice mismatch between the active material (VO₂) and conductive support (Sb:SnO₂) yields a coherent interface, where tensile strain aids preferential growth along the rutile c-axis as well as expansion in the ab plane and thereby the exposure of reactive (002) facets. The VO₂-Sb:SnO₂ electrode exhibits high reversible capacity (350 mA h g^-1 at 100 mA g^-1) and ultrafast rate capability (196 mA h g^-1 at 2000 mA g^-1) with structural stability, which represents record-high performance compared with previous VO₂ reports, including those on other polymorphs such as VO₂ (A) and VO₂ (B).

Original language	English
Pages (from-to)	216-224
Number of pages	9
Journal	ACS Energy Letters
Volume	1
Issue number	1
DOIs	https://doi.org/10.1021/acsenergylett.6b00147
Publication status	Published - 2016 Jul 8

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) Grant funded by the Ministry of Science, ICT, and Future Planning (No. 2016R1A2B2012728).

Publisher Copyright:
© 2016 American Chemical Society.

ASJC Scopus subject areas

Chemistry (miscellaneous)
Renewable Energy, Sustainability and the Environment
Fuel Technology
Energy Engineering and Power Technology
Materials Chemistry

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1021/acsenergylett.6b00147

Cite this

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title = "Heteroepitaxy-Induced Rutile VO2 with Abundantly Exposed (002) Facets for High Lithium Electroactivity",

abstract = "Research on VO2 cathodes for lithium ion batteries has been mainly focused on the VO2 (B) phase. However, rutile VO2 (M/R) has rarely been studied because of the intrinsically low lithium activity resulting from the highly anisotropic nature of lithium accommodation. Here, we demonstrate that heteroepitaxial engineering can be an effective strategy for activating the anisotropic electrode and developing kinetically superior electrodes. Appropriate lattice mismatch between the active material (VO2) and conductive support (Sb:SnO2) yields a coherent interface, where tensile strain aids preferential growth along the rutile c-axis as well as expansion in the ab plane and thereby the exposure of reactive (002) facets. The VO2-Sb:SnO2 electrode exhibits high reversible capacity (350 mA h g-1 at 100 mA g-1) and ultrafast rate capability (196 mA h g-1 at 2000 mA g-1) with structural stability, which represents record-high performance compared with previous VO2 reports, including those on other polymorphs such as VO2 (A) and VO2 (B).",

author = "Sangbaek Park and Lee, {Chan Woo} and Kim, {Jae Chan} and Song, {Hee Jo} and Shim, {Hyun Woo} and Sangwook Lee and Kim, {Dong Wan}",

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AU - Shim, Hyun Woo

AU - Lee, Sangwook

AU - Kim, Dong Wan

N1 - Funding Information: This work was supported by the National Research Foundation of Korea (NRF) Grant funded by the Ministry of Science, ICT, and Future Planning (No. 2016R1A2B2012728). Publisher Copyright: © 2016 American Chemical Society.

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N2 - Research on VO2 cathodes for lithium ion batteries has been mainly focused on the VO2 (B) phase. However, rutile VO2 (M/R) has rarely been studied because of the intrinsically low lithium activity resulting from the highly anisotropic nature of lithium accommodation. Here, we demonstrate that heteroepitaxial engineering can be an effective strategy for activating the anisotropic electrode and developing kinetically superior electrodes. Appropriate lattice mismatch between the active material (VO2) and conductive support (Sb:SnO2) yields a coherent interface, where tensile strain aids preferential growth along the rutile c-axis as well as expansion in the ab plane and thereby the exposure of reactive (002) facets. The VO2-Sb:SnO2 electrode exhibits high reversible capacity (350 mA h g-1 at 100 mA g-1) and ultrafast rate capability (196 mA h g-1 at 2000 mA g-1) with structural stability, which represents record-high performance compared with previous VO2 reports, including those on other polymorphs such as VO2 (A) and VO2 (B).

AB - Research on VO2 cathodes for lithium ion batteries has been mainly focused on the VO2 (B) phase. However, rutile VO2 (M/R) has rarely been studied because of the intrinsically low lithium activity resulting from the highly anisotropic nature of lithium accommodation. Here, we demonstrate that heteroepitaxial engineering can be an effective strategy for activating the anisotropic electrode and developing kinetically superior electrodes. Appropriate lattice mismatch between the active material (VO2) and conductive support (Sb:SnO2) yields a coherent interface, where tensile strain aids preferential growth along the rutile c-axis as well as expansion in the ab plane and thereby the exposure of reactive (002) facets. The VO2-Sb:SnO2 electrode exhibits high reversible capacity (350 mA h g-1 at 100 mA g-1) and ultrafast rate capability (196 mA h g-1 at 2000 mA g-1) with structural stability, which represents record-high performance compared with previous VO2 reports, including those on other polymorphs such as VO2 (A) and VO2 (B).

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