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
Density Functional Investigation on Li2MnO3
Ruijuan Xiao,Hong Li,Liquan Chen +2 more
TL;DR: Li2MnO3 component plays a key role in Li-rich Mn-based layered materials for achieving unusually high lithium storage capacity as mentioned in this paper, however, detailed lithium storage mechanism in Li2mNO3, such as structure evolution and charge compensation are still not very clear.
274
Lithium Extraction Mechanism in Li-Rich Li2MnO3 Involving Oxygen Hole Formation and Dimerization
Hungru Chen,M. Saiful Islam +1 more
TL;DR: In this paper, Li extraction is charge-compensated by oxidation of the oxide anion, so that the overall delithiation reaction involves lattice oxygen loss and localized holes on oxygen (O) are formed as the first step but are not stable leading to oxygen dimerization and eventually to the formation of molecular O2.
243
Influence of Cationic Substitutions on the Oxygen Loss and Reversible Capacity of Lithium-Rich Layered Oxide Cathodes
TL;DR: In this article, the influence of cationic substitutions on the ease with which oxygen loss occurs from lithium-rich layered oxide cathodes during first charge has been studied with three series of samples: Li[Li0.33Mn0.13Co0.20]O2 (0 ≤ x ≤ 0.40).
237
Atomic Structure of Li2MnO3 after Partial Delithiation and Re-Lithiation
TL;DR: Li2MnO3 is the parent compound of Li-rich Mn-based cathode materials xLi(2)mnO(3)center dot(1-x)LiMO2 for high-energy-density Li-ion batteries as discussed by the authors.
230
Structural Changes in Li2MnO3 Cathode Material for Li‐Ion Batteries
Jatinkumar Rana,Marian Cristian Stan,Richard Kloepsch,Jie Li,Gerhard Schumacher,Edmund Welter,Ivo Zizak,John Banhart,John Banhart,Martin Winter +9 more
TL;DR: In this paper, structural changes in Li2MnO3 cathode material for rechargeable Li-ion batteries are investigated during the first and 33rd cycles, and it is found that both the participation of oxygen anions in redox processes and Li+-H+ exchange play an important role in the electrochemistry of Li 2MnNO3.
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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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