TY - JOUR
T1 - Engineering Oxygen Vacancies in a Polysulfide-Blocking Layer with Enhanced Catalytic Ability
AU - Li, Zhaohuai
AU - Zhou, Cheng
AU - Hua, Junhui
AU - Hong, Xufeng
AU - Sun, Congli
AU - Li, Hai Wen
AU - Xu, Xu
AU - Mai, Liqiang
N1 - Funding Information:
This work was supported by the National Natural Science Foundation of China (51702247, 51832004), the National Key Research and Development Program of China (2018YFB0104200), the National Natural Science Fund for Distinguished Young Scholars (51425204), the Yellow Crane Talent (Science & Technology) Program of Wuhan City and the Fundamental Research Funds for the Central Universities (WUT: 2019III174, 2018IVB034, 2018IVA088, 2018III025), and the Basic Research Expense of the State Key Laboratory (20131d0005). The S/TEM work was performed at the Nanostructure Research Center (NRC), which was supported by the Fundamental Research Funds for the Central Universities (WUT: 2019III012GX), the State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, and the State Key Laboratory of Silicate Materials for Architectures (all of the laboratories are at Wuhan University of Technology). The State Key Laboratory of Advanced Technology for Materials Synthesis and Processing (WUT:2019‐KF‐5, 2020‐KF‐3).
Funding Information:
This work was supported by the National Natural Science Foundation of China (51702247, 51832004), the National Key Research and Development Program of China (2018YFB0104200), the National Natural Science Fund for Distinguished Young Scholars (51425204), the Yellow Crane Talent (Science & Technology) Program of Wuhan City and the Fundamental Research Funds for the Central Universities (WUT: 2019III174, 2018IVB034, 2018IVA088, 2018III025), and the Basic Research Expense of the State Key Laboratory (20131d0005). The S/TEM work was performed at the Nanostructure Research Center (NRC), which was supported by the Fundamental Research Funds for the Central Universities (WUT: 2019III012GX), the State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, and the State Key Laboratory of Silicate Materials for Architectures (all of the laboratories are at Wuhan University of Technology). The State Key Laboratory of Advanced Technology for Materials Synthesis and Processing (WUT:2019-KF-5, 2020-KF-3).
Publisher Copyright:
© 2020 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2020/1/1
Y1 - 2020/1/1
N2 - The practical application of the lithium–sulfur (Li–S) battery is seriously restricted by its shuttle effect, low conductivity, and low sulfur loading. Herein, first-principles calculations are conducted to verify that the introduction of oxygen vacancies in TiO2 not only enhances polysulfide adsorption but also greatly improves the catalytic ability and both the ion and electron conductivities. A commercial polypropylene (PP) separator decorated with TiO2 nanosheets with oxygen vacancies (OVs-TiO2@PP) is fabricated as a strong polysulfide barrier for the Li–S battery. The thickness of the OVs-TiO2 modification layer is only 500 nm with a low areal mass of around 0.12 mg cm−2, which enhances the fast lithium-ion penetration and the high energy density of the whole cell. As a result, the cell with the OVs-TiO2@PP separator exhibits a stable electrochemical behavior at 2.0 C over 500 cycles, even under a high sulfur loading of 7.1 mg cm−2, and an areal capacity of 5.83 mAh cm−2 remains after 100 cycles. The proposed strategy of engineering oxygen vacancies is expected to have wide applications in Li–S batteries.
AB - The practical application of the lithium–sulfur (Li–S) battery is seriously restricted by its shuttle effect, low conductivity, and low sulfur loading. Herein, first-principles calculations are conducted to verify that the introduction of oxygen vacancies in TiO2 not only enhances polysulfide adsorption but also greatly improves the catalytic ability and both the ion and electron conductivities. A commercial polypropylene (PP) separator decorated with TiO2 nanosheets with oxygen vacancies (OVs-TiO2@PP) is fabricated as a strong polysulfide barrier for the Li–S battery. The thickness of the OVs-TiO2 modification layer is only 500 nm with a low areal mass of around 0.12 mg cm−2, which enhances the fast lithium-ion penetration and the high energy density of the whole cell. As a result, the cell with the OVs-TiO2@PP separator exhibits a stable electrochemical behavior at 2.0 C over 500 cycles, even under a high sulfur loading of 7.1 mg cm−2, and an areal capacity of 5.83 mAh cm−2 remains after 100 cycles. The proposed strategy of engineering oxygen vacancies is expected to have wide applications in Li–S batteries.
UR - http://www.scopus.com/inward/record.url?scp=85078670305&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85078670305&partnerID=8YFLogxK
U2 - 10.1002/adma.201907444
DO - 10.1002/adma.201907444
M3 - Article
C2 - 31995271
AN - SCOPUS:85078670305
VL - 32
JO - Advanced Materials
JF - Advanced Materials
SN - 0935-9648
IS - 10
M1 - 1907444
ER -