Phosphorus-Doping-Induced Surface Vacancies of 3D Na2Ti3O7 Nanowire Arrays Enabling High-Rate and Long-Life Sodium Storage |
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Authors: | Dao-Sheng Liu Feng Jin Dr. Aijian Huang Dr. Xiaoli Sun Hao Su Dr. Yang Yang Dr. Yufei Zhang Dr. Xianhong Rui Dr. Hongbo Geng Prof. Cheng Chao Li |
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Affiliation: | 1. School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, 510006 P.R. China;2. School of Electronic Science and Engineering, Center for Public Security Technology, University of Electronic Science and Technology of China, Chengdu, 610054 P.R. China;3. Guangzhou Key Laboratory of Low-Dimensional Materials and Energy Storage Devices, Collaborative Innovation Center of, Advanced Energy Materials, School of Materials and Energy, Guangdong University of Technology, Guangzhou, 510006 Guangdong, P.R. China |
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Abstract: | Sodium-ion batteries have attracted interest as an alternative to lithium-ion batteries because of the abundance and cost effectiveness of sodium. However, suitable anode materials with high-rate and stable cycling performance are still needed to promote their practical application. Herein, three-dimensional Na2Ti3O7 nanowire arrays with enriched surface vacancies endowed by phosphorus doping are reported. As anodes for sodium-ion batteries, they deliver a high specific capacity of 290 mA h g−1at 0.2 C, good rate capability (50 mA h g−1at 20 C), and stable cycling capability (98 % capacity retention over 3100 cycles at 20 C). The superior electrochemical performance is attributed to the synergistic effects of the nanowire arrays and phosphorus doping. The rational structure can provide convenient channels to facilitate ion/electron transport and improve the capacitive contributions. Moreover, the phosphorus-doping-induced surface vacancies not only provide more active sites but also improve the intrinsic electrical conductivity of Na2Ti3O7, which will enable electrode materials with excellent sodium storage performance. This work may provide an effective strategy for the synthesis of other anode materials with fast electrochemical reaction kinetics and good sodium storage performance. |
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Keywords: | doping electrochemistry nanostructures sodium-ion batteries titanium |
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