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Title: Surface Gradient Ti-Doped MnO 2 Nanowires for High-Rate and Long-Life Lithium Battery

Abstract

Cryptomelane-type a-MnO 2 has been demonstrated as a promising anode material for high-energy Li-ion batteries (LIBs) due to its high capacity and intriguing [2 × 2] tunnel structure. However, applications of MnO 2 electrode especially at high current rates and mass active material loading are limited by the poor mechanical stability, unstable solid electrolyte interphase (SEI) layer, and low reversibility of conversion reactions. Here, we report a design of homogeneous core-shell MnO 2 nanowires (NWs) created by near-surface gradient Ti doping (Ti-MnO 2 NWs). Such a structurally-coherent core-shell configuration endowed gradient volume expansion from inner core to outer shell, which could effectively release the stress of the NW lattice during the cycling and avoid the pulverization of the electrode. In this way, the Ti-MnO 2 NWs achieved a high reversible capacity (766 mAh g -1 at 200 mA g -1), a superior round-trip efficiency (coulombic efficiency achieved above 99.5% after only 30 cycles), and a long lifetime (a capacity of 742 mAh g -1 after 3000 cycle at 10 A g -1). In addition, the detailed conversion reaction mechanism was investigated through in-situ TEM, which further evidenced the unique homogeneous core-shell structure could largely suppress the separation of core andmore » shell upon charging and discharging. This new NW configuration could benefit the design of other large-volume-change lithium battery anode materials.« less

Authors:
ORCiD logo [1];  [2]; ORCiD logo [3]; ORCiD logo [4];  [3]; ORCiD logo [5]; ORCiD logo [3]; ORCiD logo [4]; ORCiD logo [3]
  1. Department of Material Science and Engineering, University of Wisconsin−Madison, Madison, Wisconsin 53706, United States; State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, P. R. China
  2. Department of Material Science and Engineering, University of Wisconsin−Madison, Madison, Wisconsin 53706, United States; Environmental and Molecular Sciences Laboratory (EMSL), Pacific Northwest National Laboratory, Richland 99352, Washington, United States
  3. Department of Material Science and Engineering, University of Wisconsin−Madison, Madison, Wisconsin 53706, United States
  4. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, P. R. China
  5. Environmental and Molecular Sciences Laboratory (EMSL), Pacific Northwest National Laboratory, Richland 99352, Washington, United States
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)
OSTI Identifier:
1494397
Report Number(s):
PNNL-SA-132890
Journal ID: ISSN 1944-8244
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
ACS Applied Materials and Interfaces
Additional Journal Information:
Journal Volume: 10; Journal Issue: 51; Journal ID: ISSN 1944-8244
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English

Citation Formats

Zhao, Kangning, Sun, Congli, Yu, Yanhao, Dong, Yifan, Zhang, Chenyu, Wang, Chongmin, Voyles, Paul M., Mai, Liqiang, and Wang, Xudong. Surface Gradient Ti-Doped MnO2 Nanowires for High-Rate and Long-Life Lithium Battery. United States: N. p., 2018. Web. doi:10.1021/acsami.8b13376.
Zhao, Kangning, Sun, Congli, Yu, Yanhao, Dong, Yifan, Zhang, Chenyu, Wang, Chongmin, Voyles, Paul M., Mai, Liqiang, & Wang, Xudong. Surface Gradient Ti-Doped MnO2 Nanowires for High-Rate and Long-Life Lithium Battery. United States. doi:10.1021/acsami.8b13376.
Zhao, Kangning, Sun, Congli, Yu, Yanhao, Dong, Yifan, Zhang, Chenyu, Wang, Chongmin, Voyles, Paul M., Mai, Liqiang, and Wang, Xudong. Thu . "Surface Gradient Ti-Doped MnO2 Nanowires for High-Rate and Long-Life Lithium Battery". United States. doi:10.1021/acsami.8b13376.
@article{osti_1494397,
title = {Surface Gradient Ti-Doped MnO2 Nanowires for High-Rate and Long-Life Lithium Battery},
author = {Zhao, Kangning and Sun, Congli and Yu, Yanhao and Dong, Yifan and Zhang, Chenyu and Wang, Chongmin and Voyles, Paul M. and Mai, Liqiang and Wang, Xudong},
abstractNote = {Cryptomelane-type a-MnO2 has been demonstrated as a promising anode material for high-energy Li-ion batteries (LIBs) due to its high capacity and intriguing [2 × 2] tunnel structure. However, applications of MnO2 electrode especially at high current rates and mass active material loading are limited by the poor mechanical stability, unstable solid electrolyte interphase (SEI) layer, and low reversibility of conversion reactions. Here, we report a design of homogeneous core-shell MnO2 nanowires (NWs) created by near-surface gradient Ti doping (Ti-MnO2 NWs). Such a structurally-coherent core-shell configuration endowed gradient volume expansion from inner core to outer shell, which could effectively release the stress of the NW lattice during the cycling and avoid the pulverization of the electrode. In this way, the Ti-MnO2 NWs achieved a high reversible capacity (766 mAh g-1 at 200 mA g-1), a superior round-trip efficiency (coulombic efficiency achieved above 99.5% after only 30 cycles), and a long lifetime (a capacity of 742 mAh g-1 after 3000 cycle at 10 A g-1). In addition, the detailed conversion reaction mechanism was investigated through in-situ TEM, which further evidenced the unique homogeneous core-shell structure could largely suppress the separation of core and shell upon charging and discharging. This new NW configuration could benefit the design of other large-volume-change lithium battery anode materials.},
doi = {10.1021/acsami.8b13376},
journal = {ACS Applied Materials and Interfaces},
issn = {1944-8244},
number = 51,
volume = 10,
place = {United States},
year = {2018},
month = {11}
}