Boosting energy efficiency of Li-rich layered oxide cathodes by tuning oxygen redox kinetics and reversibility

Yin, Chong; Wan, Liyang; Qiu, Bao; Wang, Feng; Jiang, Wei; Cui, Hui-Wang; Bai, Jianming; Ehrlich, Steven N.; Wei, Zhining; Liu, Zhaoping

doi:10.1016/j.ensm.2020.11.034

Cited by 50 publications

(40 citation statements)

References 71 publications

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“…The mechanisms of oxygen loss suppression were proposed as; core shell structure formation, and solid-solution formation. Compositional tuning, particularly by increasing Ni content was found to control oxygen redox as reported very recently by Yin et al [39] Introduction of a stepwise precycling treatment was found to suppress the oxygen release during activation in a Li 1.26 Mn 0.52 Fe 0.22 O 2 cell with graphite as counter electrode. With the aid of ex situ XAS and X-ray photoelectron spectroscopy (XPS), the main charge compensation mechanism was revealed to be a redox reaction of O 2− to form O 2 2− , in addition to the expected transition metal redox reaction.…”

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confidence: 60%

Direct Observation of Reductive Coupling Mechanism between Oxygen and Iron/Nickel in Cobalt‐Free Li‐Rich Cathode Material: An in Operando X‐Ray Absorption Spectroscopy Study

Dixon

Mangold

Knapp

et al. 2021

Advanced Energy Materials

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Development of positive electrode (cathode) materials for Li-ion batteries, possessing high capacity is necessary to meet current energy requirements and hence to facilitate their commercial applications. The layered Li-rich materials with a general composition xLi 2 MnO 3 •(1−x) LiMO 2 (M = Mn, Co, Ni, Fe) are attractive candidates as high-capacity cathode materials as they can deliver long term reversible capacities close to 200 mAh g −1 when cycled within the voltage range 2.0-4.8 V. [1][2][3][4][5][6] In the Li-rich layered materials, mixed transition metal/Li layers exist unlike in pure layered materials like LiCoO 2 . The former layer will be separated from Li-only layers by oxygen layers. Due to the presence of Li on the transition metal layer, a superlattice ordering of the transition metal and lithium takes place, which lowers the symmetry of the Li-rich material to mono clinic C2/m from R3m. [3] It was first demonstrated in 1999 by Kalyani et al., that Li 2 MnO 3 could be activated electrochemically in a Li-half cell by increasing the upper cut off voltage to 4.5 V. [7] When the initial research works were focused on purely manganese-containing layered Li-rich chemistries, later works mainly focused on Co and Ni-substituted layered Li-rich materials. [4,[8][9][10][11][12][13] Additionally, Fe-substituted layered materials also received considerable attention from the '90s onwards, due to the low cost and wide abundance of Fe compared to Co and Ni. [6,14,-20] In 1993, Reimers et al., reported a work on a Fe and Ni containing layered material, LiFe y Ni 1−y O 2 , which was found isostructural with LiNiO 2 in a selected composition range of 0 ≤ y ≤ 0.23. [21] In another composition range of 0.23 ≤ y ≤ 0.48, a coexistence of hexagonal (LiFe 0.23 Ni 0.77 O 2 , with a cation mixing between lithium layers and transition metal, particularly Fe) and cubic phases (LiFe 0.48 Ni 0.58 O 2 ) were observed. The electrochemical cycling conducted between voltage range of 2.0-4.2 V reveals a decrease in the reversible capacity with increase in the iron content "y". [21] Fe-substituted Li 2 MnO 3 was investigated as a 4 V cathode in lithium-ion cells in 2002, by Tabuchi et al. [22] The capacity delivered by the material was found to be influenced by the synthesis method, annealing temperature and voltage range applied. In situ Moessbauer spectroscopy investigations reveal the oxidation of Fe 3+ Li-rich cathodes possess high capacity and are promising candidates in next-generation high-energy density Li-ion batteries. This high capacity is partly attributed to its poorly understood oxygen-redox activity. The presentLi-rich cathodes contain expensive and environmentally-incompatible cobalt as a main transition metal. In this work, cobalt-free, iron-containing Li-rich cathode material (nominal composition Li 1.2 Mn 0.56 Ni 0.16 Fe 0.08 O 2 ) is synthesized, which exhibits excellent discharge capacity (≈250 mAh g −1 ) and cycling stability. In operando, X-ray absorption spectroscopy at Mn, Fe, and Ni K edges reveals its elec...

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supporting

confidence: 60%

Direct Observation of Reductive Coupling Mechanism between Oxygen and Iron/Nickel in Cobalt‐Free Li‐Rich Cathode Material: An in Operando X‐Ray Absorption Spectroscopy Study

Dixon

Mangold

Knapp

et al. 2021

Advanced Energy Materials

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“…Another strategy for this active material is to modify the surface using La-Co-O compounds [177]. Finally, this material has been also synthetized to improve the kinetics and reversibility of transition-metal (TM) ion migration, leading to an ultrahigh energy efficiency at 1 C (90.6%) and high capacity (>200 mAh•g −1 ) [178].…”

Section: Active Cathode Materialsmentioning

confidence: 99%

“…tion, leading to an ultrahigh energy efficiency at 1 C (90.6%) and high capacity (>200 mAh•g −1 ) [178].…”

Section: Active Cathode Materialsmentioning

confidence: 99%

Recent Advances on Materials for Lithium-Ion Batteries

et al. 2021

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Environmental issues related to energy consumption are mainly associated with the strong dependence on fossil fuels. To solve these issues, renewable energy sources systems have been developed as well as advanced energy storage systems. Batteries are the main storage system related to mobility, and they are applied in devices such as laptops, cell phones, and electric vehicles. Lithium-ion batteries (LIBs) are the most used battery system based on their high specific capacity, long cycle life, and no memory effects. This rapidly evolving field urges for a systematic comparative compilation of the most recent developments on battery technology in order to keep up with the growing number of materials, strategies, and battery performance data, allowing the design of future developments in the field. Thus, this review focuses on the different materials recently developed for the different battery components—anode, cathode, and separator/electrolyte—in order to further improve LIB systems. Moreover, solid polymer electrolytes (SPE) for LIBs are also highlighted. Together with the study of new advanced materials, materials modification by doping or synthesis, the combination of different materials, fillers addition, size manipulation, or the use of high ionic conductor materials are also presented as effective methods to enhance the electrochemical properties of LIBs. Finally, it is also shown that the development of advanced materials is not only focused on improving efficiency but also on the application of more environmentally friendly materials.

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Section: Introductionmentioning

confidence: 99%

“…14,15 One of the typical representatives are the lithium-rich oxides since they can provide more than one-electron storage capabilities in comparison to the conventional intercalation process. 16,17 The cationic redox is the main capacity contributor for lithium-rich oxides, and the low-cost Mn-based lithium-rich oxides are the key parts due to their special structures and unique electrochemical characteristics. 18,19 However, even though extra efforts have been made, the troublesome problems such as complex structures in short and long ranges, cation mixing, oxygen release based on newly discovered anionic redox activities, migration route of the transformed metal ions, and phase transformation in these Mn-based lithium-rich oxides have largely hindered their further applications as cathodes in the commercial markets.…”

Section: Introductionmentioning

confidence: 99%

Lithium-rich sulfide/selenide cathodes for next-generation lithium-ion batteries: challenges and perspectives

et al. 2022

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Boosting energy efficiency of Li-rich layered oxide cathodes by tuning oxygen redox kinetics and reversibility

Cited by 50 publications

References 71 publications

Direct Observation of Reductive Coupling Mechanism between Oxygen and Iron/Nickel in Cobalt‐Free Li‐Rich Cathode Material: An in Operando X‐Ray Absorption Spectroscopy Study

Direct Observation of Reductive Coupling Mechanism between Oxygen and Iron/Nickel in Cobalt‐Free Li‐Rich Cathode Material: An in Operando X‐Ray Absorption Spectroscopy Study

Recent Advances on Materials for Lithium-Ion Batteries

Lithium-rich sulfide/selenide cathodes for next-generation lithium-ion batteries: challenges and perspectives

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