In situ generated spinel-phase skin on layered Li-rich short nanorods as cathode materials for lithium-ion batteries

Zhao, Taolin; Ji, Rixin; Yu, Muhuo; Zhang, Guanglei; Si, Huayan; Wang, Yuhua; Yang, Minli; Wu, Feng; Li, Li; Chen, Renjie

doi:10.1007/s10853-019-03425-8

Cited by 15 publications

(5 citation statements)

References 28 publications

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“…28 The Fe 2p spectra confirms the presence of Fe in the +3 state within the sample, which agrees with previous studies of the Fe doped samples. 29,30 Magnetic properties.-Figure 6 shows M-H measurement of the Fe-doped LSMO samples at 10 K. The M-H plots clearly show the ferromagnetic behavior of Fe-doped LSMO, for x ⩾0.09 the M-H loop remains unsaturated up to a magnetic field of 4 T. The saturation magnetization (M s ) also decreases with Fe concentration at the Mn site as shown in Table II [Fig. 7a].…”

Section: X-ray Photoelectron Spectroscopy (Xps) Analysismentioning

confidence: 95%

Role of Fe (x = 0–0.15) Substitution on Structural, Magnetic, and Transport Properties of the La_0.7Sr_0.3Fe_xMn_1−xO₃ System

Navin¹,

Subohi

Ball³

et al. 2021

ECS J. Solid State Sci. Technol.

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This paper investigates the effect of Fe substitution on the structural, magnetic and transport properties of the La0.7Sr0.3MnxFe1-xO3 (LSMO) system where x ranged between 0 and 0.15. Samples were prepared using a non-aqueous sol-gel synthesis method. Structural and chemical analysis confirmed the Fe 3+ substitution at Mn 3+ sites without any impurity phase resulted in a small change in structural parameters of the LSMO. The change in magnetic behavior and Curie temperature of the Fe-doped LSMO is explained through competitive exchange interactions developed in the system. The temperature-dependent resistivity demonstrated that the resistivity of the samples increased with Fe concentration due to different conduction mechanisms related to the ferromagnetic-metallic and paramagnetic-insulating regions. The magneto-transport measurement showed significant improvement in the magnetoresistance due to Fe doping at Mn site, which was attributed to enhancement of the spin-glass phase in Fe doped LSMO system. The reduction in magnetoresistance for higher Fe concentration is explained with the help of percolation threshold mechanism.

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Section: X-ray Photoelectron Spectroscopy (Xps) Analysismentioning

confidence: 95%

Role of Fe (x = 0–0.15) Substitution on Structural, Magnetic, and Transport Properties of the La_0.7Sr_0.3Fe_xMn_1−xO₃ System

Navin¹,

Subohi

Ball³

et al. 2021

ECS J. Solid State Sci. Technol.

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“…Due to the enhanced electronic conductivities provide by the CNT and fast ionic conductivities endowed by spinel structure, such a designed sample exhibited a high energy density (1077 Wh kg −1 at 0.1 C) and excellent rate capability (195 mAh g −1 at 10 C) (Figure 5b). In addition to carbon nanotubes, many surface treatment agents also have been used, such as PH 3 , [ 41 ] NH 3 , [ 42 ] H 2 C 2 O 4 , [ 14d ] oleic acid, [ 43 ] Mn(AC) 2 , [ 44 ] KClO 3 , [ 45 ] Na 2 S 2 O 3 , [ 46 ] Na 2 S 2 O 8 , [ 47 ] PVdF, [ 14b ] ammonium salt [ 14e,34,48 ] and other carbon source. [ 13g,14c,f,h,40,49 ] Most of the surface treatments were able to result in other surface modifications besides spinel layer.…”

Section: In Situ Surface Reconstruction Strategiesmentioning

confidence: 99%

In Situ Surface Self‐Reconstruction Strategies in Li‐Rich Mn‐Based Layered Cathodes for Energy‐Dense Li‐Ion Batteries

Gou

Hao

et al. 2022

Adv Funct Materials

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Lithium‐rich manganese‐based layered oxides (LROs) are standing out as cathode materials of lithium‐ion batteries (LIBs) due to merits on both capacity (>250 mAh g−1) and operation voltage (≈3.6 V). However, the applications of LROs are plagued by almost inevitable degradation of structure, in which electrode surface bears the brunt as the primacy barrier for Li+ transport. Plenty of surface modification strategies are proposed to stabilize the structure and in situ self‐reconstruction strategies with atomic level connection to bulk structures provide robust layers to prevent the degradation. Herein, a critical review focusing on in situ surface reconstruction of LROs is summarized. It is started from the overview of LROs and then the surface challenges including lattice oxygen release, phase transformation, transition metal ions dissolution, and interfacial side reactions are further discussed. In situ self‐reconstruction strategies are emphasized to alleviate the performance degradation of LROs, from creating oxygen vacancies to synthesizing layered‐spinel or layered‐rocksalt heterogeneous structures. Among these approaches, synthesis and characterization methods, formation mechanisms and roles to stabilize the structures are highlighted. Finally, the prospects from the aspects of precise/large scale preparations, interphase design between electrolytes and electrodes, and in‐operando characterization approaches for the commercialization of LROs are provided.

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“…Various strategies have been proven to be effective in enhancing the structure stability, capacity retention stability, and voltage stability of LLOs, including element doping, [ 27–31 ] surface coating, [ 32–37 ] and morphology control. [ 38–41 ] However, most of these strategies were applied to polycrystalline LLOs. Polycrystalline LLOs are inherently prone to particle fracture and the exposure of fresh particle surfaces during cycling due to lattice expansion/contraction, which further promotes undesirable cathode/electrolyte interfacial side reactions.…”

Section: Introductionmentioning

confidence: 99%

High‐Performance Single‐Crystal Lithium‐Rich Layered Oxides Cathode Materials via Na₂WO₄‐Assisted Sintering

Duan,

Wang,

Huang

et al. 2023

Small

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Single‐crystal lithium‐rich layered oxides (LLOs) with excellent mechanical properties can enhance their crystal structure stability. However, the conventional methods for preparing single‐crystal LLOs, require large amounts of molten salt additives, involve complicated washing steps, and increase the difficulty of large‐scale production. In this study, a sodium tungstate (Na2WO4)‐assisted sintering method is proposed to fabricate high‐performance single‐crystal LLOs cathode materials without large amounts of additives and additional washing steps. During the sintering process, Na2WO4 promotes particle growth and forms a protective coating on the surface of LLOs particles, effectively suppressing the side reactions at the cathode/electrolyte interface. Additionally, trace amounts of Na and W atoms are doped into the LLOs lattice via gradient doping. Experimental results and theoretical calculations indicate that Na and W doping stabilizes the crystal structure and enhances the Li+ ions diffusion rate. The prepared single‐crystal LLOs exhibit outstanding capacity retention of 82.7% (compared to 65.0%, after 200 cycles at 1 C) and a low voltage decay rate of 0.76 mV per cycle (compared to 1.80 mV per cycle). This strategy provides a novel pathway for designing the next‐generation high‐performance cathode materials for Lithium‐ion batteries (LIBs).

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In situ generated spinel-phase skin on layered Li-rich short nanorods as cathode materials for lithium-ion batteries

Cited by 15 publications

References 28 publications

Role of Fe (x = 0–0.15) Substitution on Structural, Magnetic, and Transport Properties of the La_0.7Sr_0.3Fe_xMn_1−xO₃ System

Role of Fe (x = 0–0.15) Substitution on Structural, Magnetic, and Transport Properties of the La_0.7Sr_0.3Fe_xMn_1−xO₃ System

In Situ Surface Self‐Reconstruction Strategies in Li‐Rich Mn‐Based Layered Cathodes for Energy‐Dense Li‐Ion Batteries

High‐Performance Single‐Crystal Lithium‐Rich Layered Oxides Cathode Materials via Na₂WO₄‐Assisted Sintering

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In situ generated spinel-phase skin on layered Li-rich short nanorods as cathode materials for lithium-ion batteries

Cited by 15 publications

References 28 publications

Role of Fe (x = 0–0.15) Substitution on Structural, Magnetic, and Transport Properties of the La0.7Sr0.3FexMn1−xO3 System

Role of Fe (x = 0–0.15) Substitution on Structural, Magnetic, and Transport Properties of the La0.7Sr0.3FexMn1−xO3 System

In Situ Surface Self‐Reconstruction Strategies in Li‐Rich Mn‐Based Layered Cathodes for Energy‐Dense Li‐Ion Batteries

High‐Performance Single‐Crystal Lithium‐Rich Layered Oxides Cathode Materials via Na2WO4‐Assisted Sintering

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Role of Fe (x = 0–0.15) Substitution on Structural, Magnetic, and Transport Properties of the La_0.7Sr_0.3Fe_xMn_1−xO₃ System

Role of Fe (x = 0–0.15) Substitution on Structural, Magnetic, and Transport Properties of the La_0.7Sr_0.3Fe_xMn_1−xO₃ System

High‐Performance Single‐Crystal Lithium‐Rich Layered Oxides Cathode Materials via Na₂WO₄‐Assisted Sintering