Layered Perovskite Lithium Yttrium Titanate as a Low‐Potential and Ultrahigh‐Rate Anode for Lithium‐Ion Batteries

Zhang, Yun; Huang, Jun; Saito, Nagahiro; Yang, Xiaolong; Zhang, Zhengxi; Yang, Li; Hirano, Shin‐ichi

doi:10.1002/aenm.202200922

Cited by 23 publications

(20 citation statements)

References 83 publications

(68 reference statements)

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“…Ideally, the anode voltage is low enough as well as the cathode voltage is high enough, providing a higher energy density of LIBs accordingly. After calculation, we obtained that the voltage platform of Li 2 CoB is 0.05 V, which is much closer to the redox potential for Li–metal (−3.04 V compared to the standard hydrogen electrode) than graphite (0.1 V), so that it could be paired with more cathode materials, indicating the feasibility of Li 2 CoB being a new anode material.…”

Section: Resultsmentioning

confidence: 85%

Layered Li–Co–B as a Low-Potential Anode for Lithium-Ion Batteries

et al. 2023

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An anode material is one of the key factors affecting the capacity, cycle, and rate (fast charge) performance of lithium-ion batteries. Using the adaptive genetic algorithm, we found a new ground-state Li 2 CoB and two metastable states LiCoB and LiCo 2 B 2 in the Li−Co−B system. The Li 2 CoB phase is a lithium-rich layered structure, and it has an equivalent lithium-ion migration barrier (0.32 eV) in addition to the lower voltage platform (0.05 V) than graphite, which is the most important commercial anode material at present. Moreover, we analyzed the mechanism of delithiation for Li 2 CoB and found that it maintained metallicity in the process of delithiation, indicating its good conductivity as an electrode material. Therefore, it is an excellent potential anode material for lithium-ion batteries. Our work provides a promising theoretical basis for the experimental synthesis of Li−Co−B and similar new materials.

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Section: Resultsmentioning

confidence: 85%

Layered Li–Co–B as a Low-Potential Anode for Lithium-Ion Batteries

et al. 2023

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“…The XPS spectrum of Ti(2p 3/2 , 2p 1/2 ) after HER testing does not show any shift in the peak positions, indicating that Ti remains in the same oxidation state of +4. The Y 3d spectrum displays two sets of doublets (shown in Figure c) which are fitted into two pairs of peaks; one pair corresponds to the Y 3+ of yttrium oxide for which the binding energy is 156.1 and 158.1 eV corresponding to the spin–orbit doublets 3d 5/2 and 3d 3/2 , respectively, and the other pair corresponds to the Y 3+ of the sample at ∼159.1 eV (3d 3/2 ) and ∼156.9 eV (3d 5/2 ) due to surface yttrium carbonate formation . The Na (1s) and O (1s) spectra of NaYTiO 4 are also given in Figure d,e, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…Ti 2p 3/2 and 2p 1/2 peaks appeared at 458 and 463.5 eV, respectively, for anatase TiO 2 , and peaks appeared at 457.5 and 463.4 eV, respectively, for the as-prepared samples of NaYTiO 4 , confirming the presence of Ti as Ti 4+ in the sample. 42,43 The slightly lower Ti (2p 3/2 , 2p 1/2 ) peaks for Ti 4+ in NaYTiO 4 compared to TiO 2 are due to the strong ionic interaction O with Y and Na ions in the sample that reduces the ionicity of the Ti− O bond that reduces the binding energy of Ti 2p states in the sample. The XPS spectrum of Ti(2p 3/2 , 2p 1/2 ) after HER testing does not show any shift in the peak positions, indicating that Ti remains in the same oxidation state of +4.…”

Section: ■ Experimental Studiesmentioning

confidence: 99%

Tuning of Redox Energy of Transition-Metal Ions through the Utilization of Interlayer Potentials in Layered Perovskites: Development of a Titanium-Based Superior HER Catalyst in an Acidic Medium

Jaiswal

Mondal

Kushwaha

et al. 2023

ACS Appl. Energy Mater.

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Efficient electrolysis of water is important for green hydrogen production using renewable energy sources, which requires efficient electrocatalysts having active sites for the hydrogen evolution reaction (HER) to reduce the overpotential and energy consumption. The most efficient HER catalysts are Pt-, Ru-, and Ir-based noble metals, which catalyze the HER with near-zero overpotential. Electrocatalysis utilizes a redox process of the active cation in the framework; the host cations accept/donate electrons for each such conversion reaction or catalytic activity. The relative position of these redox energies with respect to the Fermi level and controlling their variations in different oxides are important for designing novel electrocatalysts and electrodes for electrochemical conversion devices. The utilization of interlayer potential to tune the relative redox energies of the Ti(IV)/Ti(III) redox couples in layered K-and Gd-doped NaYTiO 4 , Na 1−x K x Y 1−x Gd x TiO 4 (x ≤ 0.2), was envisaged here to develop a superior HER electrocatalyst. Polycrystalline sodium yttrium titanate (NaYTiO 4 ) has been synthesized by the sol−gel method and presented as an efficient catalyst for the HER for the very first time. Electrochemical studies reveal superior HER activity; the NaYTiO 4 activity is not only better than that of TiO 2 due to distorted (elongated) octahedral TiO 6 present in NaYTiO 4 but also superior or at least equivalent to that of most of the oxide electrocatalysts studied for the HER. Electrochemical tests reveal good HER performance of our synthesized electrocatalyst with an overpotential of 148 mV and a Tafel slope of 102 mV/dec with good stability for 24 h. Furthermore, due to the increase in strength of the interlayer dipolar electric field (interlayer potential), NaY 0.8 Gd 0.2 TiO 4 (overpotential: 106 mV; Tafel slope: 90 mV/dec) showed superior activity to that of NaYTiO 4 . Utilization of the interlayer potential and strategy for altering the internal electric field (interlayer potential) in layered materials to tune the redox energies of active redox couples and superior electron transfer accelerated by the internal electric field or interlayer potential is presented in the article that can be further utilized to develop superior electrocatalysts and electronic materials.

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“…Typically, the SEs are incorporated in the battery, mainly to resolve the electrolyte leakage, flammability, and limited energy density of liquid electrolytes [2]. Compared with conventional liquid batteries, known as lithium-ion batteries, SEs show superior performance, higher safety in electric vehicles (EVs) and operational durability [3,4]. Nonetheless, the fabrication of the architecture is still challenged by interfacial issues between the electrode and SEs, generally due to the instability of the SEs against the metallic anode and cathode, obstructing their use in practical applications.…”

Section: Introductionmentioning

confidence: 99%

The Liquid-Mediated Synthesis and Performance Evaluation of Li-Zr-F Composite for Ion-Conduction

Moon¹,

Thiangtham²,

Ruijie³

et al. 2023

J Energ Power Technol

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Crystalline lithium fluoride (LiF) has been intensively pursued as potential alternative solid electrolytes (SEs) owing to its excellent chemical and electrochemical oxidation stability, and good deformability. However, due to its low ion conductivity, LiF is still challenging for practical SE applications. Herein, Li-Zr-F composite-based SE by liquid-mediated synthesis is proposed to be studied. methanol (CH3OH) was mainly evaluated as a liquid-mediated precursor for synthesizing Li-Zr-F composites under the stoichiometric proportion of LiF and ZrF4 (2:1 and 2:0.8) and a subsequent annealing process at 25°C/150°C, 50°C/150°C, and 70°C/150°C, respectively. X-ray diffraction results revealed that the Li-Zr-F composites could be crystallized in the three main types of phase formations, including Li2ZrF6 ( ), Li2ZrF6 ( ), and Li4ZrF8 ( ) octahedron structures. In addition, the effect of cation stack sublattice synthesized by methanol mediator on the ion conduction of Li-Zr-F composites was investigated by using electrochemical impedance spectroscopy (EIS). Through the Zr4+-substitution, Li2ZrF6 ( )-based SE exhibited the highest ion conduction which was increased to 2.40 × 10-8 S/cm and 3.89 × 10-8 S/cm under the stoichiometric proportion of LiF and ZrF4 2:0.8 at a dried temperature of 50°C/150°C with, respectively. A 0.21 eV activation energy ( ) was achieved for a battery with Li2ZrF6 ( )-based SE. Meanwhile, LiF exhibited up to 0.78 eV leading to a low kinetic rate for ion diffusion. These results implied that Li2ZrF6 ( )-based SE was successfully synthesized under the optimal condition of CH3OH-50°C/150°C which could improve the ion-conductivity of LiF.

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Layered Perovskite Lithium Yttrium Titanate as a Low‐Potential and Ultrahigh‐Rate Anode for Lithium‐Ion Batteries

Cited by 23 publications

References 83 publications

Layered Li–Co–B as a Low-Potential Anode for Lithium-Ion Batteries

Layered Li–Co–B as a Low-Potential Anode for Lithium-Ion Batteries

Tuning of Redox Energy of Transition-Metal Ions through the Utilization of Interlayer Potentials in Layered Perovskites: Development of a Titanium-Based Superior HER Catalyst in an Acidic Medium

The Liquid-Mediated Synthesis and Performance Evaluation of Li-Zr-F Composite for Ion-Conduction

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