Engineering of Cerium Modified TiNb 2 O 7 Nanoparticles For Low-Temperature Lithium-Ion Battery.

Autor: Yu G; School of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao, Shandong, 266590, P. R. China., Huang J; Key Laboratory for Liquid-Solid Structural Evolution & Processing of Materials (Ministry of Education), Shandong University, Jinan, Shandong, 250061, P. R. China., Bai X; School of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao, Shandong, 266590, P. R. China., Li T; Key Laboratory for Liquid-Solid Structural Evolution & Processing of Materials (Ministry of Education), Shandong University, Jinan, Shandong, 250061, P. R. China., Song S; School of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao, Shandong, 266590, P. R. China., Zhou Y; School of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao, Shandong, 266590, P. R. China., Wu N; School of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao, Shandong, 266590, P. R. China., Yao S; School of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao, Shandong, 266590, P. R. China., Lu X; College of Energy Storage Technology, Shandong University of Science and Technology, Qingdao, Shandong, 266590, P. R. China., Wu W; Key Laboratory for Liquid-Solid Structural Evolution & Processing of Materials (Ministry of Education), Shandong University, Jinan, Shandong, 250061, P. R. China.
Jazyk: angličtina
Zdroj: Small (Weinheim an der Bergstrasse, Germany) [Small] 2024 Aug; Vol. 20 (34), pp. e2308858. Date of Electronic Publication: 2024 Apr 15.
DOI: 10.1002/smll.202308858
Abstrakt: Although TiNb 2 O 7 (TNO) with comparable operating potential and ideal theoretical capacity is considered to be the most ideal replacement for negative Li 4 Ti 5 O 12 (LTO), the low ionic and electronic conductivity still limit its practical application as satisfactory anode for lithium-ion batteries (LIBs) with high-power density. Herein, TNO nanoparticles modified by Cerium (Ce) with outstanding electrochemical performance are synthesized. The successful introduction of Ce 3+ in the lattice leads to increased interplanar spacing, refined grain size, more oxygen vacancy, and a smaller lithium diffusion barrier, which are conducive to improve conductivity of both Li + and electrons. As a result, the modified TNO reaches high reversible capacity of 256.0 mA h g -1 at 100 mA g -1 after 100 cycles, and 183.0 mA h g -1 even under 3200 mA g -1 . In particular, when the temperature drops to -20 °C, the cell undergoing 1500 cycles at a high current density of 500 mA g -1 can still reach 89.7 mA h g -1 , corresponding to a capacity decay rate per cycle of only 0.033%. This work provides a new way to improve the electrochemical properties of alternative anodes for LIBs at extreme temperature.
(© 2024 Wiley‐VCH GmbH.)
Databáze: MEDLINE
Externí odkaz: