Lanthanide doping induced electrochemical enhancement of Na2 Ti3 O7 anodes for sodium-ion batteries

Chemical Science
Jiale XiaYaping Du

Abstract

Na2Ti3O7 is considered as a promising anode material for sodium ion batteries (SIBs) due to its excellent high-rate performance compared with hard carbons. However, the electrochemical performance of Na2Ti3O7 is heavily limited by its low electrical conductivity. In this study, we synthesized a series of lanthanide (Ln = La, Ce, Nd, Sm, Gd, Er, and Yb) doped microsized Na2Ti3O7 anode materials and systematically studied the electrochemical performance. Compared with pristine Na2Ti3O7, all the doped samples show superior electrochemical performance. Especially, the Yb3+ doped sample not only delivers a high reversible capacity of 89.4 mA h g-1 at 30C, but also maintains 71.6 mA h g-1 at 5C after 1600 cycles, nearly twice that of pristine Na2Ti3O7. It is found for the first time that the enhancement in doped samples is attributed to the introduction of lanthanides which induces lattice distortion and oxygen vacancies.

References

Nov 20, 2001·Nature·J M Tarascon, M Armand
Jun 9, 2012·Advanced Materials·Yuwon ParkSung You Hong
Jun 20, 2012·Angewandte Chemie·Johann M FecklThomas Bein
Oct 6, 2012·Advanced Materials·Laifa ShenGuozhong Cao
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Dec 6, 2016·Nature Materials·Hyung-Seok KimBruce Dunn

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Citations

Aug 20, 2020·Chemical Communications : Chem Comm·Stephanie A BeachLinda H Doerrer
Aug 28, 2020·Chemistry : a European Journal·Sara I R CostaNuria Tapia-Ruiz
Mar 13, 2021·Advanced Materials·Shuai ZhangChun-Hua Yan
Sep 23, 2021·ACS Applied Materials & Interfaces·Guo-Ping YangXing-Long Wu
Dec 11, 2021·Nanoscale Horizons : the Home for Rapid Reports of Exceptional Significance in Nanoscience and Nanotechnolgy·Zhong LiangYaping Du

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Methods Mentioned

BETA
X-ray

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