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Heterogeneous Ti3SiC2@C-containing Na2Ti7O15 architecture for high-performance sodium storage at elevated temperatures.

Zou, Guodong; Zhang, Qingrui; Fernandez, Carlos; Huang, Gang; Huang, Jianyu; Peng, Qiuming

Authors

Guodong Zou

Qingrui Zhang

Carlos Fernandez

Gang Huang

Jianyu Huang

Qiuming Peng



Abstract

Rational design of heterogeneous electrode materials with hierarchical architecture is a potential approach to significantly improve their energy densities. Herein, we report a tailored microwave-assisted synthetic strategy to create heterogeneous hierarchical Ti3SiC2@C-containing Na2Ti7O15 (MAX@C-NTO) composites as potential anode materials for high-performance sodium storage in a wide temperature range from 25 to 80 {deg}C. This composite delivers first reversible capacities of 230 mAh g-1 at 200 mA g-1 and 149 mAh g-1 at 3000 mA g-1 at 25 {deg}C. A high capacity of ~93 mAh g-1 without any apparent decay even after more than 10 000 cycles is obtained at an ultrahigh current density of 10 000 mA g-1. Moreover, both a high reversible capacity and an ultralong durable stability are achieved below 60 {deg}C for the same composites, wherein a 75.2% capacity retention (~120 mAh g-1 at 10 000 mA g-1) is achieved after 3000 cycles at 60 {deg}C. To the best of our knowledge, both the sodium storage performances and the temperature tolerances outperform those of all the Ti-based sodium storage materials reported so far. The superior sodium storage performances of the as-synthesized composites are attributed to the heterogeneous core'shell architecture, which not only provides fast kinetics by high pseudocapacitance but also prolongs cycling life by preventing particle agglomeration and facilitates the transportation of electrons and sodium ions by large micro/mesopore structure.

Journal Article Type Article
Publication Date Nov 30, 2017
Journal ACS nano
Print ISSN 1936-0851
Electronic ISSN 1936-086X
Publisher American Chemical Society
Peer Reviewed Peer Reviewed
Volume 11
Issue 12
Pages 12219-12229
Institution Citation ZOU, G., ZHANG, Q., FERNANDEZ, C., HUANG, G., HUANG, J. and PENG, Q. 2017. Heterogeneous Ti3SiC2@C-containing Na2Ti7O15 architecture for high-performance sodium storage at elevated temperatures. ACS nano [online], 11(12), pages 12219-12229. Available from: https://doi.org/10.1021/acsnano.7b05559
DOI https://doi.org/10.1021/acsnano.7b05559
Keywords Electrode; High rate performance; Intercalation; MAX@CNTO composite; Pseudocapacitance; Sodiumion batteries

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