Green Strategy to Single Crystalline Anatase TiO 2 Nanosheets with Dominant (001) Facets and Its Lithiation Study toward Sustainable Cobalt-Free Lithium Ion Full Battery
Kwak, Won Jin
Sun, Yang Kook
KAUST DepartmentPhysical Sciences and Engineering (PSE) Division
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AbstractA green hydrothermal strategy starting from the Ti powders was developed to synthesis a new kind of well dispersed anatase TiO nanosheets (TNSTs) with dominant (001) facets, successfully avoiding using the HF by choosing the safe substitutes of LiF powder. In contrast to traditional approaches targeting TiO with dominant crystal facets, the strategy presented herein is more convenient, environment friendly and available for industrial production. As a unique structured anode applied in lithium ion battery, the TNSTs could exhibit an extremely high capacity around 215 mAh g at the current density of 100 mA g and preserved capacity over 140 mAh g enduring 200 cycles at 400 mA g. As a further step toward commercialization, a model of lithiating TiO was built for the first time and analyzed by the electrochemical characterizations, and full batteries employing lithiated TNSTs as carbon-free anode versus spinel LiNiMnO (x = 0, 0.5) cathode were configured. The full batteries of TNSTs/LiMnO and TNSTs/LiNiMnO have the sustainable advantage of cost-effective and cobalt-free characteristics, and particularly they demonstrated high energy densities of 497 and 580 Wh kg (i.e., 276 and 341 Wh kg ) with stable capacity retentions of 95% and 99% respectively over 100 cycles. Besides the intriguing performance in batteries, the versatile synthetic strategy and unique characteristics of TNSTs may promise other attracting applications in the fields of photoreaction, electro-catalyst, electrochemistry, interfacial adsorption photovoltaic devices etc.
CitationMing H, Kumar P, Yang W, Fu Y, Ming J, et al. (2015) Green Strategy to Single Crystalline Anatase TiO2Nanosheets with Dominant (001) Facets and Its Lithiation Study toward Sustainable Cobalt-Free Lithium Ion Full Battery. ACS Sustainable Chemistry & Engineering 3: 3086–3095. Available: http://dx.doi.org/10.1021/acssuschemeng.5b00553.
SponsorsFinancial supports from the Nature Science Foundation of China (Nos. 20873089, 20975073), Nature Science Foundation of Jiangsu Province (Nos. BK2011272), Industry-Academia Cooperation Innovation Fund Projects of Jiangsu Province (Nos. BY2011130), Project of Scientific and Technologic Infrastructure of Suzhou (SZS201207), Graduate Research and Innovation Projects in Jiangsu Province (CXZZ13_0802), and Hunan Provincial Innovation Foundation for Postgraduate (CX2012B206) are gratefully acknowledged. This work was mainly supported by the Global Frontier R&D Program (2013M3A6B1078875) on Center for Hybrid Interface Materials (HIM) funded by the Ministry of Science, Information & Communication Technology (ICT) and Future Planning and also supported by the National Research Foundation of Korea (NRF) grant funded by the Korea Government Ministry of Education and Science Technology (MEST) (No.2014R1A2A1A13050479). J.M., P.IC, and L.-J.L. thank the great support from King Abdullah University of Science and Technology, Thuwal, Saudi Arabia.
PublisherAmerican Chemical Society (ACS)