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Effect of the Niobi...
Effect of the Niobium Doping Concentration on the Charge Storage Mechanism of Mesoporous Anatase Beads as an Anode for High-Rate Li-Ion Batteries
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- Cavallo, Carmen, 1986 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology,Universitetet i Oslo,University of Oslo,Chalmers Univ Technol, Dept Phys, S-41296 Gothenburg, Sweden.,Chalmers Univ Technol, Dept Chem & Chem Engn, S-41296 Gothenburg, Sweden.
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- Calcagno, Giulio, 1990 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology,Chalmers Univ Technol, Dept Chem & Chem Engn, S-41296 Gothenburg, Sweden.
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- Pereira de Carvalho, Rodrigo (författare)
- Uppsala universitet,Materialteori
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- Sadd, Matthew, 1994 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology,Chalmers Univ Technol, Dept Phys, S-41296 Gothenburg, Sweden.
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- Gonano, Bruno (författare)
- Universitetet i Oslo,University of Oslo,Univ Oslo, Ctr Mat Sci & Nanotechnol, Dept Chem, N-0371 Oslo, Norway.
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- Araujo, Moyses, 1975- (författare)
- Uppsala universitet,Materialteori
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- Palmqvist, Anders, 1966 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Matic, Aleksandar, 1968 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology,Chalmers Univ Technol, Dept Phys, S-41296 Gothenburg, Sweden.;Univ Oslo, Ctr Mat Sci & Nanotechnol, Dept Chem, N-0371 Oslo, Norway.
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(creator_code:org_t)
- 2020-12-17
- 2021
- Engelska.
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Ingår i: ACS Applied Energy Materials. - : American Chemical Society (ACS). - 2574-0962. ; 4:1, s. 215-225
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Abstract
Ämnesord
Stäng
- A promising strategy to improve the rate performance of Li-ion batteries is to enhance and facilitate the insertion of Li ions into nanostructured oxides like TiO2. In this work, we present a systematic study of pentavalent-doped anatase TiO2 materials for third-generation high-rate Li-ion batteries. Mesoporous niobium-doped anatase beads (Nb-doped TiO2) with different Nb5+ doping (n-type) concentrations (0.1, 1.0, and 10% at.) were synthesized via an improved template approach followed by hydrothermal treatment. The formation of intrinsic n-type defects and oxygen vacancies under RT conditions gives rise to a metallic-type conduction due to a shift of the Fermi energy level. The increase in the metallic character, confirmed by electrochemical impedance spectroscopy, enhances the performance of the anatase bead electrodes in terms of rate capability and provides higher capacities both at low and fast charging rates. The experimental data were supported by density functional theory (DFT) calculations showing how a different n-type doping can be correlated to the same electrochemical effect on the final device. The Nb-doped TiO2 electrode materials exhibit an improved cycling stability at all the doping concentrations by overcoming the capacity fade shown in the case of pure TiO2 beads. The 0.1% Nb-doped TiO2-based electrodes exhibit the highest reversible capacities of 180 mAh g-1 at 1C (330 mA g-1) after 500 cycles and 110 mAh g-1 at 10C (3300 mA g-1) after 1000 cycles. Our experimental and computational results highlight the possibility of using n-type doped TiO2 materials as anodes in high-rate Li-ion batteries.
Ämnesord
- NATURVETENSKAP -- Kemi -- Oorganisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Inorganic Chemistry (hsv//eng)
- NATURVETENSKAP -- Kemi -- Materialkemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Materials Chemistry (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Kemiteknik -- Annan kemiteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Chemical Engineering -- Other Chemical Engineering (hsv//eng)
Nyckelord
- DFT calculation
- Rietveld refinement
- mesoporous niobium doped anatase
- n-type doped anode materials
- high-rate batteries
- Li-ion batteries
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Cavallo, Carmen, ...
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Calcagno, Giulio ...
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Pereira de Carva ...
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Sadd, Matthew, 1 ...
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Gonano, Bruno
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Araujo, Moyses, ...
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Palmqvist, Ander ...
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Matic, Aleksanda ...
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