Dresden 2017 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 79: Poster: New Materials
HL 79.10: Poster
Donnerstag, 23. März 2017, 15:00–19:00, P2-OG3
structural engineering of electrode materials for Na-ion batteries — •Benrong Hai1,2, Yang Xu1, Min Zhou1, Chengliang Wang1, Liying Liang1, Yan Mi1, and Yong Lei1 — 1TU-ilmenau, Ilmenau, Germany — 2Northeastern University, Shenyang, P. R. China
In response to the increased demands of energy storage, Na-ion batteries (SIBs) appear as alternatives to lithium ion batteries. However, because of large radius of Na ions, more complex requirements for the intrinsic properties raise the difficulties in finding a suitable material. Structural engineering is a promising approach to enhance sodium storage, of which amorphization and introduction of oxygen vacancies are two efficient methods to allow the crystalline features of active materials more suitable for large sodium ions. For the former method, TiO2 electrodes with different orderliness of atomic arrangement are employed as the state-of-the art example. Corresponding results prove that the disordering at the surface is benefit for the faradaic contribution from surface processes, which is particularly significant to the electrode materials with poorer affinity of transporting ions. With regard to the influences of oxygen vacancies (OVs), the SIB performance of MoO3 and amorphous SnO2 with and without OVs both evidence that the OVs can increase the electric conductivity and Na-ion diffusion coefficient, leading to the promotion of sodium storage.