Open AccessPartially Reduced Titanium Niobium Oxide: A High‐Performance Lithium‐Storage Material in a Broad Temperature Range
Author(s) -
Jiang Tian,
Ma Siyuan,
Deng Jianbin,
Yuan Tao,
Lin Chunfu,
Liu Meilin
Publication year - 2022
Publication title -
advanced science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.388
H-Index - 100
ISSN - 2198-3844
DOI - 10.1002/advs.202105119
Subject(s) - materials science , niobium , lithium (medication) , electrochemistry , titanium , faraday efficiency , atmospheric temperature range , niobium oxide , conductivity , chemical engineering , electrode , metallurgy , chemistry , thermodynamics , medicine , physics , engineering , endocrinology
The existing electrode materials for lithium‐ion batteries (LIBs) generally suffer from poor rate capability at low temperatures, severely limiting their applications in winter and cold climate area. Here, partially reduced TiNb 24 O 62 (PR‐TNO) are reported that demonstrates excellent electrochemical performance in a broad temperature range, notably at low temperatures. Its crystal structure is similar to that of Ti 2 Nb 10 O 29 upon partial reduction in H 2 . The titanium and niobium ions in PR‐TNO enable multielectron transfer, safe operation, and high Coulombic efficiencies. Benefiting from the increased electronic conductivity of the partially reduced phase and its robust crystal structure with a large interlayer spacing, PR‐TNO shows fast electron and Li + transport, small volume change associated with Li + storage, and notable capacitive behavior, resulting in good electrochemical performance even at very low temperatures. At −20 °C, a large reversible capacity of 313 mAh g −1 is obtained at 0.1C, reaching 83.3% of that at 25 °C. At 5C, high rate capability (58.3% of that at 0.5C) is achieved, only slightly lower than that at 25 °C (60.7%). Furthermore, PR‐TNO demonstrates excellent cyclic stability with 99.2% of the initial capacity after 1680 cycles, confirming its excellent suitability for low‐temperature LIBs.