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Improve First-Cycle Efficiency and Rate Performance of Layered-Layered Li1.2Mn0.6Ni0.2O2 Using Oxygen Stabilizing Dopant
被引:45
作者:

Li, Jinfeng
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机构:
Tsinghua Univ, Key Lab Organ Optoelect & Mol Engn, Dept Chem, Beijing 100084, Peoples R China Tsinghua Univ, Key Lab Organ Optoelect & Mol Engn, Dept Chem, Beijing 100084, Peoples R China

Zhan, Chun
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Argonne Natl Lab, Chem Sci & Engn Div, Argonne, IL 60439 USA Tsinghua Univ, Key Lab Organ Optoelect & Mol Engn, Dept Chem, Beijing 100084, Peoples R China

Lu, Jun
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机构:
Argonne Natl Lab, Chem Sci & Engn Div, Argonne, IL 60439 USA Tsinghua Univ, Key Lab Organ Optoelect & Mol Engn, Dept Chem, Beijing 100084, Peoples R China

Yuan, Yifei
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机构:
Argonne Natl Lab, Chem Sci & Engn Div, Argonne, IL 60439 USA
Michigan Technol Univ, Dept Mat Sci & Engn, Houghton, MI 49931 USA Tsinghua Univ, Key Lab Organ Optoelect & Mol Engn, Dept Chem, Beijing 100084, Peoples R China

Shahbazian-Yassar, Reza
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Michigan Technol Univ, Dept Mat Sci & Engn, Houghton, MI 49931 USA Tsinghua Univ, Key Lab Organ Optoelect & Mol Engn, Dept Chem, Beijing 100084, Peoples R China

Qiu, Xinping
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机构:
Tsinghua Univ, Key Lab Organ Optoelect & Mol Engn, Dept Chem, Beijing 100084, Peoples R China Tsinghua Univ, Key Lab Organ Optoelect & Mol Engn, Dept Chem, Beijing 100084, Peoples R China

Amine, Khalil
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h-index: 0
机构:
Argonne Natl Lab, Chem Sci & Engn Div, Argonne, IL 60439 USA Tsinghua Univ, Key Lab Organ Optoelect & Mol Engn, Dept Chem, Beijing 100084, Peoples R China
机构:
[1] Tsinghua Univ, Key Lab Organ Optoelect & Mol Engn, Dept Chem, Beijing 100084, Peoples R China
[2] Argonne Natl Lab, Chem Sci & Engn Div, Argonne, IL 60439 USA
[3] Michigan Technol Univ, Dept Mat Sci & Engn, Houghton, MI 49931 USA
基金:
美国国家科学基金会;
北京市自然科学基金;
关键词:
layered-layered Li1.2Mn0.6Ni0.2O2;
barium doping;
lithium ion battery;
oxygen releasing;
stabilizing oxygen radicals;
LI-RICH CATHODE;
SITU X-RAY;
ELECTROCHEMICAL PROPERTIES;
MANGANESE OXIDES;
CO ELECTRODES;
LITHIUM;
CAPACITY;
NI;
LI2MNO3;
MN;
D O I:
10.1021/acsami.5b04343
中图分类号:
TB3 [工程材料学];
学科分类号:
0805 ;
080502 ;
摘要:
The poor first-cycle Coulombic efficiency and rate performance of the Li-rich layered layered oxides are associated with oxygen gas generation in the first activation charging and sluggish charge transportation along the layers. hi this work, we report that barium doping improves the first-cycle efficiency of Li-rich layered-layered Li1.2Mn0.6Ni0.2O2 via suppression of the oxidation of O2- ions in the first charging. This effect can be attributed to the stabilizing effect of the barium cations on the oxygen radical intermediates generated during the oxidation of O2-. Meanwhile, because the stabilized oxygen radicals likely facilitate the charge transportation in the layered-layered structure, the barium-doped Li1.2Mn0.6Ni0.2O2 exhibits significant improvement in rate performance. Stabilizing the oxygen radicals could be a promising strategy to improve the electrochemical performance of Li-rich layered-layered oxides.
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收藏
页码:16040 / 16045
页数:6
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