Volume 16, Issue 26 2000681
Full Paper

SnO2 Quantum Dots: Rational Design to Achieve Highly Reversible Conversion Reaction and Stable Capacities for Lithium and Sodium Storage

Yong Cheng

Yong Cheng

State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, CAS, Changchun, 130022 China

Key Laboratory of Preparation and Applications of Environmental Friendly Materials, Ministry of Education, Jilin Normal University, Changchun, 130103 China

Search for more papers by this author
Shaohua Wang

Shaohua Wang

State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, CAS, Changchun, 130022 China

Search for more papers by this author
Lin Zhou

Corresponding Author

Lin Zhou

State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, CAS, Changchun, 130022 China

E-mail: [email protected], [email protected], [email protected]

Search for more papers by this author
Limin Chang

Limin Chang

Key Laboratory of Preparation and Applications of Environmental Friendly Materials, Ministry of Education, Jilin Normal University, Changchun, 130103 China

Search for more papers by this author
Wanqiang Liu

Wanqiang Liu

School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun, 130022 China

Search for more papers by this author
Dongming Yin

Corresponding Author

Dongming Yin

State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, CAS, Changchun, 130022 China

E-mail: [email protected], [email protected], [email protected]

Search for more papers by this author
Zheng Yi

Corresponding Author

Zheng Yi

State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, CAS, Changchun, 130022 China

E-mail: [email protected], [email protected], [email protected]

Search for more papers by this author
Limin Wang

Limin Wang

State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, CAS, Changchun, 130022 China

Search for more papers by this author
First published: 04 June 2020
Citations: 101

Abstract

SnO2 has been considered as a promising anode material for lithium-ion batteries (LIBs) and sodium ion batteries (SIBs), but challenging as well for the low-reversible conversion reaction and coulombic efficiency. To address these issues, herein, SnO2 quantum dots (≈5 nm) embedded in porous N-doped carbon matrix (SnO2/NC) are developed via a hydrothermal step combined with a self-polymerization process at room temperature. The ultrasmall size in quantum dots can greatly shorten the ion diffusion distance and lower the internal strain, improving the conversion reaction efficiency and coulombic efficiency. The rich mesopores/micropores and highly conductive N-doped carbon matrix can further enhance the overall conductivity and buffer effect of the composite. As a result, the optimized SnO2/NC-2 composite for LIBs exhibits a high coulombic efficiency of 72.9%, a high discharge capacity of 1255.2 mAh g−1 at 0.1 A g−1 after 100 cycles and a long life-span with a capacity of 753 mAh g−1 after 1500 cycles at 1 A g−1. The SnO2/NC-2 composite also displays excellent performance for SIBs, delivering a superior discharge capacity of 212.6 mAh g−1 at 1 A g−1 after 3000 cycles. These excellent results can be of visible significance for the size effect of the uniform quantum dots.

Conflict of Interest

The authors declare no conflict of interest.

The full text of this article hosted at iucr.org is unavailable due to technical difficulties.