Li/Na Storage Properties of Disordered Carbons Synthesized by Mechanical Milling

Shimizu, Soma; Rajendra, Hongahally Basappa; Watanuki, Ryuta; Yabuuchi, Naoaki

doi:10.5796/electrochemistry.19-00029

Cited by 8 publications

(7 citation statements)

References 25 publications

(37 reference statements)

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“…Although the phase-pure sample is not obtained in the binary system of NaMnO 2 -TiO 2 , both layered and tunnel phases are electrochemically active as clearly shown in Figure 5(b). Therefore, no sacrifice of reversible capacity is observed for these nonpure phases, which are used as highcapacity positive electrode materials for high-performance and cost-effective sodium storage applications combined with carbonaceous negative electrode materials [48] in the future.…”

Section: Energy Materials Advancesmentioning

confidence: 99%

Efficient Stabilization of Na Storage Reversibility by Ti Integration into O′3-Type NaMnO ₂

et al. 2021

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The development of an energy storage system with abundant elements is a key challenge for a sustainable society, and the interest of Na intercalation chemistry is extending throughout the research community. Herein, the impact of Ti integration into NaMnO2 in a binary system of x NaMnO2–(1–x) TiO2 (0.5≤x≤1) is systematically examined for rechargeable Na battery applications. Stoichiometric NaMnO2, which is classified as an in-plane distorted O′3-type layered structure, delivers a large initial discharge capacity of approximately 200 mAh g-1, but insufficient capacity retention is observed, most probably associated with dissolution of Mn ions on electrochemical cycles. Ti-substituted samples show highly improved electrode performance as electrode materials. However, the appearance of a sodium-deficient phase, Na4Mn4Ti5O18 with a tunnel-type structure, is observed for Ti-rich phases. Among the samples in this binary system, Na0.8Mn0.8Ti0.2O2 (x=0.8), which is a mixture of a partially Ti-substituted O′3-type layered oxide (Na0.88Mn0.88Ti0.12O2) and tunnel-type Na4Mn4Ti5O18 as a minor phase elucidated by Rietveld analysis on both neutron and X-ray diffraction patterns, shows good electrode performance on the basis of energy density and cyclability. Both phases are electrochemically active as evidenced by in situ X-ray diffraction study, and the improvement of reversibility originates from the suppression of Mn dissolution on electrochemical cycles. From these results, the feasibility of Mn-based electrode materials for high-energy rechargeable Na batteries made from only abundant elements is discussed in detail.

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Section: Energy Materials Advancesmentioning

confidence: 99%

Efficient Stabilization of Na Storage Reversibility by Ti Integration into O′3-Type NaMnO ₂

et al. 2021

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“…However, sodium ions cannot be inserted into graphite, which presumably originates from the thermodynamic limitation, and only a high stage graphite intercalation compound is formed by electrochemical reduction in aprotic electrolyte solutions with Na salts. 8 Instead of graphite, hard carbon, which has different microporous structures, 9 is used as a negative electrode material for sodium storage applications. 10,11 Na ions are reversibly accumulated in hard carbon with micropores in which quasi-metallic sodium is formed.…”

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P2-type layered Na_0.67Cr_0.33Mg_0.17Ti_0.5O₂ for Na storage applications

et al. 2021

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“…The highly graphitic carbon layer is also effective to reduce the side reaction of electrolyte decomposition. 29 Consequently, the graphitic carbon layer derived from PTCDA is evidenced to play a major role in improving the rate capability of LNVO with the DRS structure.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Highly Graphitic Carbon Coating on Li_1.25Nb_0.25V_0.5O₂ Derived from a Precursor with a Perylene Core for High-Power Battery Applications

Konuma

Campéon

et al. 2022

Chem. Mater.

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A Li-excess cation-disordered rocksalt (DRS) positive electrode material with Nb/V ions, Li 1.25 Nb 0.25 V 0.5 O 2 (LNVO), delivers a high reversible specific capacity of >250 mA h g −1 on the basis of two-electron redox of V 3+ /V 5+ . However, the inferior rate performance originating from a character of the disordered structure prevents its use for practical applications. Here, a facile and efficient top-down approach to synthesize nanosized LNVO carbon composited materials has been developed through a combination of ball-milling and subsequent heat-treating steps. The markedly improved rate capability is achieved by highly graphitic carbon coating with superior conductivity derived from a precursor with a perylene core. The growth of particle sizes of LNVO is effectively suppressed by uniform mixing of the precursor by optimized milling conditions. The optimized nanosized sample with shorter Li ion migration paths shows excellent rate capability for the rocksalt oxide. Moreover, superior capacity retention for continuous 100 cycles is also achieved. Furthermore, by lowering the Li ion migration barrier at elevated temperatures, a larger reversible specific capacity of 300 mA h g −1 , which nearly corresponds to its theoretical specific capacity, is obtained, coupled with further improved rate capability because of facile conduction for Li ions in oxides and electrolyte. This finding opens the possibility to develop high-performance electrode materials with a cation-DRS structure for practical battery applications.

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Li/Na Storage Properties of Disordered Carbons Synthesized by Mechanical Milling

Cited by 8 publications

References 25 publications

Efficient Stabilization of Na Storage Reversibility by Ti Integration into O′3-Type NaMnO ₂

Efficient Stabilization of Na Storage Reversibility by Ti Integration into O′3-Type NaMnO ₂

P2-type layered Na_0.67Cr_0.33Mg_0.17Ti_0.5O₂ for Na storage applications

Highly Graphitic Carbon Coating on Li_1.25Nb_0.25V_0.5O₂ Derived from a Precursor with a Perylene Core for High-Power Battery Applications

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Li/Na Storage Properties of Disordered Carbons Synthesized by Mechanical Milling

Cited by 8 publications

References 25 publications

Efficient Stabilization of Na Storage Reversibility by Ti Integration into O′3-Type NaMnO 2

Efficient Stabilization of Na Storage Reversibility by Ti Integration into O′3-Type NaMnO 2

P2-type layered Na0.67Cr0.33Mg0.17Ti0.5O2 for Na storage applications

Highly Graphitic Carbon Coating on Li1.25Nb0.25V0.5O2 Derived from a Precursor with a Perylene Core for High-Power Battery Applications

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Efficient Stabilization of Na Storage Reversibility by Ti Integration into O′3-Type NaMnO ₂

Efficient Stabilization of Na Storage Reversibility by Ti Integration into O′3-Type NaMnO ₂

P2-type layered Na_0.67Cr_0.33Mg_0.17Ti_0.5O₂ for Na storage applications

Highly Graphitic Carbon Coating on Li_1.25Nb_0.25V_0.5O₂ Derived from a Precursor with a Perylene Core for High-Power Battery Applications