Journal
ELECTROCHIMICA ACTA
Volume 319, Issue -, Pages 490-498Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2019.07.027
Keywords
Ultrathin SnO2; Al2O3 coating; Atomic layer deposition; Cycling stability; Lithium ion battery
Categories
Funding
- National Natural Science Foundation of China [61674085]
- Fundamental Research Funds for the Central Universities, Nankai University [023-63185006]
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SnO2 is considered as a high capacity anode material for lithium ion batteries. However, the poor cycling stability has seriously hindered its practical applications. In this work, we designed and prepared Al2O3/SnO2/CNTs composites by uniformly and conformally depositing SnO2 and Al2O3 on carbon nanotubes (CNTs) via a simple two-step atomic layer deposition (ALD) process. The thicknesses of SnO2 and Al2O3 were precisely controlled by tuning the number of ALD-cycle to optimize the cycling performance of Al2O3/SnO2/CNTs electrodes. The ultrathin SnO2 layer with a thickness of approximate 2.8 nm on CNTs exhibits a high capacity and an enhanced cycling stability due to the buffering effect of CNTs and limited SnO2 crystallization after the first step deposition. On this basis, Al2O3/SnO2/CNTs electrodes exhibit a significantly improved cycling stability, rate capability and Coulombic efficiency due to surface stability and the structural integrity brought by Al2O3 passivation after the second step deposition. Especially, 10-Al2O3/SnO2/CNTs electrode deliveries a discharge capacity of 581.6 mAh g(-1) at a current density of 100 mA g(-1) and capacity retention is 90.85% against 2nd cycle after 200 charge-discharge cycles. We believe that this work provides an effective way for the design of high performance anode materials in advanced batteries. (C) 2019 Elsevier Ltd. All rights reserved.
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