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Revisited Ti2Nb2O9 as an Anode Material for Advanced Li-Ion Batteries.
Drozhzhin, Oleg A; Grigoryev, Vladislav V; Alekseeva, Anastasia M; Samigullin, Ruslan R; Aksyonov, Dmitry A; Boytsova, Olga V; Chernyshov, Dmitry; Shapovalov, Victor V; Guda, Alexander A; Soldatov, Alexander V; Stevenson, Keith J; Abakumov, Artem M; Antipov, Evgeny V.
Affiliation
  • Drozhzhin OA; Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russian Federation.
  • Grigoryev VV; Skoltech Center for Energy Science and Technology, Skolkovo Institute of Science and Technology, Nobel Str. 3, 143026 Moscow, Russian Federation.
  • Alekseeva AM; Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russian Federation.
  • Samigullin RR; Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russian Federation.
  • Aksyonov DA; Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russian Federation.
  • Boytsova OV; Skoltech Center for Energy Science and Technology, Skolkovo Institute of Science and Technology, Nobel Str. 3, 143026 Moscow, Russian Federation.
  • Chernyshov D; Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russian Federation.
  • Shapovalov VV; Kurnakov Institute of General and Inorganic Chemistry RAS, Moscow, 119071, Russia.
  • Guda AA; Swiss-Norwegian Beamlines, European Synchrotron, 71 Rue des Martyrs, Grenoble, 38043, France.
  • Soldatov AV; Peter the Great St. Petersburg Polytechnic University, 29 Polytekhnicheskaya St, Saint-Petersburg, 195251, Russia.
  • Stevenson KJ; The Smart Materials Research Institute, Southern Federal University, 178/24 A. Sladkova street, Rostov-on-Don, 344090, Russia.
  • Abakumov AM; The Smart Materials Research Institute, Southern Federal University, 178/24 A. Sladkova street, Rostov-on-Don, 344090, Russia.
  • Antipov EV; The Smart Materials Research Institute, Southern Federal University, 178/24 A. Sladkova street, Rostov-on-Don, 344090, Russia.
ACS Appl Mater Interfaces ; 13(47): 56366-56374, 2021 Dec 01.
Article in En | MEDLINE | ID: mdl-34784712
ABSTRACT
Ti2Nb2O9 with a tunnel-type structure is considered as a perspective negative electrode material for Li-ion batteries (LIBs) with theoretical capacity of 252 mAh g-1 corresponding to one-electron reduction/oxidation of Ti and Nb, but only ≈160 mAh g-1 has been observed practically. In this work, highly reversible capacity of 200 mAh g-1 with the average (de)lithiation potential of 1.5 V vs Li/Li+ is achieved for Ti2Nb2O9 with pseudo-2D layered morphology obtained via thermal decomposition of the NH4TiNbO5 intermediate prepared by K+→ H+→ NH4+ cation exchange from KTiNbO5. Using operando synchrotron powder X-ray diffraction (SXPD), single-phase (de)lithiation mechanism with 4.8% unit cell volume change is observed. Operando X-ray absorption near-edge structure (XANES) experiment revealed simultaneous Ti4+/Ti3+ and Nb5+/Nb4+ reduction/oxidation within the whole voltage range. Li+ migration barriers for Ti2Nb2O9 along [010] direction derived from density functional theory (DFT) calculations are within the 0.15-0.4 eV range depending on the Li content that is reflected in excellent C-rate capacity retention. Ti2Nb2O9 synthesized via the ion-exchange route appears as a strong contender to widely commercialized Ti-based negative electrode material Li4Ti5O12 in the next generation of high-performance LIBs.
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Full text: 1 Database: MEDLINE Language: En Year: 2021 Type: Article
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Full text: 1 Database: MEDLINE Language: En Year: 2021 Type: Article