Facile synthesis of rutile TiO2/carbon nanosheet composite from MAX phase for lithium storage
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2019年第9期
论文作者：Zhaoruxin Guan Xiaoxue Wang Tingting Li Qizhen Zhu Mengqiu Jia Bin Xu
文章页码：1977 - 1981
摘 要：Titanium oxide（TiO2）, with excellent cycling stability and low volume expansion, is a promising anode material for lithium-ion battery（LIB）, which suffers from low electrical conductivity and poor rate capability. Combining nano-sized TiO2 with conductive materials is proved an efficient method to improve its electrochemical properties. Here, rutile TiO2/carbon nanosheet was obtained by calcinating MAX（Ti3 AlC2） and Na2 CO3 together and water-bathing with HCl. The lamellar carbon atoms in MAX are converted to 2 D carbon nanosheets with urchin-like rutile Ti O2 anchored on. The unique architecture can offer plentiful active sites, shorten the ion diffusion distance and improve the conductivity. The composite exhibits a high reversible capacity of 247 m Ahg-1, excellent rate performance(38 m Ahg-1 at 50 C)and stable cycling performance（0.014% decay per cycle during 2000 cycles） for lithium storage.
Zhaoruxin Guan，Xiaoxue Wang，Tingting Li，Qizhen Zhu，Mengqiu Jia，Bin Xu
State Key Laboratory of Organic-Inorganic Composites, Beijing Key Laboratory of Electrochemical Process and Technology for Materials, Beijing University of Chemical Technology
摘 要：Titanium oxide（TiO2）, with excellent cycling stability and low volume expansion, is a promising anode material for lithium-ion battery（LIB）, which suffers from low electrical conductivity and poor rate capability. Combining nano-sized TiO2 with conductive materials is proved an efficient method to improve its electrochemical properties. Here, rutile TiO2/carbon nanosheet was obtained by calcinating MAX（Ti3 AlC2） and Na2 CO3 together and water-bathing with HCl. The lamellar carbon atoms in MAX are converted to 2 D carbon nanosheets with urchin-like rutile Ti O2 anchored on. The unique architecture can offer plentiful active sites, shorten the ion diffusion distance and improve the conductivity. The composite exhibits a high reversible capacity of 247 m Ahg-1, excellent rate performance(38 m Ahg-1 at 50 C)and stable cycling performance（0.014% decay per cycle during 2000 cycles） for lithium storage.
关键词：
