Journal Article10.1149/1.3110803
Electrochemical Activities in Li2MnO3
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TL;DR: Li 2 MnO 3 is shown to be electrochemically active, with a maximum charge capacity of 350 mAh/g and a discharge capacity of ~260 m Ah/g at 25°C as mentioned in this paper.
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Abstract: Li 2 MnO 3 is shown to be electrochemically active, with a maximum charge capacity of ~ 350 mAh/g and a discharge capacity of ~260 mAh/g at 25°C. A total of I mole of Li can be extracted from Li[Li 1/3 Mn 2/3 ]O 2 , and the first cycle efficiency is ∼66% regardless of state of charge. Larger charge-discharge capacity is obtained from materials with smaller particle size and larger amount of stacking faults. Composition and structural analyses indicate that Li are removed from both the Li and transitional metal layers of the material during charging. Results from X-ray-absorption fine-structure measurements suggest that the valence of Mn remains at 4+ during charging but is reduced during discharging. Charging is accompanied by gas generation: at 25°C, oxygen is the main gas detected, and the total amount accounts for ∼ 1/8 mole of O 2 generation from Li[Li 1/3 Mn 2/3 ]O 2 . At an elevated temperature, amount of CO 2 increases due to electrolyte decomposition. Li 2 MnO 3 shows poor cycle performance, which is attributed to phase transformation and low charge-discharge efficiency during cycling. Low first-cycle efficiency, gas generation, and poor cycle performance limit the usage of Li 2 MnO 3 in practical batteries.
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Citations
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132
Direct synthesis of oxygen-deficient Li2MnO3−x for high capacity lithium battery electrodes
Kei Kubota,Takayuki Kaneko,Masaaki Hirayama,Masao Yonemura,Yuichiro Imanari,Kenji Nakane,Ryoji Kanno +6 more
TL;DR: The structure of the reduced phase determined by X-ray diffraction experiments has oxygen vacancies in the layered structure, causing slightly larger lattice parameters than the stoichiometric Li 2 MnO 3.
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Quantifying the Capacity Contributions during Activation of Li2MnO3
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TL;DR: Li2MnO3 was originally considered to be electrochemically inert, but its observed activation has spawned a new class of Li-rich layered compounds that deliver capacities beyond the traditional t...
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Effect of magnesium doping on properties of lithium-rich layered oxide cathodes based on a one-step co-precipitation strategy
Ruizhi Yu,Xianyou Wang,Yanqing Fu,Lianwu Wang,Siyu Cai,Meihong Liu,Bing Lu,Gang Wang,Di Wang,Qifang Ren,Xiukang Yang +10 more
TL;DR: In this paper, a Mg-doped lithium-rich layered oxide material is successfully synthesized via a co-precipitation process and a subsequent high-temperature solid state method.
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Li2MnO3-stabilized LiMO2 (M = Mn, Ni, Co) electrodes for lithium-ion batteries
Michael M. Thackeray,Sun-Ho Kang,Christopher S. Johnson,John T. Vaughey,Roy Benedek,Stephen A. Hackney +5 more
TL;DR: In this paper, a strategy used to design high capacity (>200 mAh g−1), Li2MnO3-stabilized LiMO2 (M = Mn, Ni, Co) electrodes for lithium-ion batteries is discussed.
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Demonstrating Oxygen Loss and Associated Structural Reorganization in the Lithium Battery Cathode Li[Ni0.2Li0.2Mn0.6]O2
A. Robert Armstrong,Michael Holzapfel,Petr Novák,Christopher S. Johnson,Sun-Ho Kang,and Michael M. Thackeray,Peter G. Bruce +6 more
TL;DR: It is demonstrated directly, by in situ differential electrochemical mass spectrometry (DEMS), that O2 is evolved from such Mn4+ -containing compounds, Li-Mn-Ni-O compounds, which can, after O loss, store 200 mAhg(-1) of charge compared with 140mAhg (-1) for LiCoO(2).
1.5K
Understanding the Anomalous Capacity of Li / Li [ Ni x Li ( 1 / 3 − 2x / 3 ) Mn ( 2 / 3 − x / 3 ) ] O 2 Cells Using In Situ X-Ray Diffraction and Electrochemical Studies
Zhonghua Lu,J. R. Dahn +1 more
TL;DR: In this article, it was shown that Li/Li[Ni x Li (1/3-2x/3) Mn (2 /3-x /3) ]O 2 cells give smooth reversible voltage profiles reaching about 4.45 V when 2x Li atoms per formula unit are removed, as expected.
979
Layered Cathode Materials Li [ Ni x Li ( 1 / 3 − 2x / 3 ) Mn ( 2 / 3 − x / 3 ) ] O 2 for Lithium-Ion Batteries
TL;DR: The structure, synthesis, and electrochemical behavior of layered for 5/12, and 1/2 are reported for the first time in this article, where the authors derive from or by substitution of and by while maintaining all the remaining Mn atoms in the 4+ oxidation state.
944
The significance of the Li2MnO3 component in ‘composite’ xLi2MnO3 · (1 − x)LiMn0.5Ni0.5O2 electrodes
Christopher S. Johnson,J.-S. Kim,Christina Lefief,Naichao Li,John T. Vaughey,Michael M. Thackeray +5 more
TL;DR: In this paper, the performance of 0.3Li 2 MnO 3, 0.7LiMn 0.5 Ni 0.35 O 2 composite electrodes was compared with the behavior of electrodes that were preconditioned by acid treatment, showing that acid treatment significantly reduces the coulombic inefficiency of the initial charge/discharge cycle of the cells.
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