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Author Ruiyi, Li ♦ Tengyuan, Chen ♦ Beibei, Sun ♦ Zaijun, Li ♦ Zhiquo, Gu ♦ Guangli, Wang ♦ Junkang, Liu
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword NANOSCIENCE AND NANOTECHNOLOGY ♦ AGGLOMERATION ♦ CAPACITY ♦ CRYSTALS ♦ DISTRIBUTION ♦ ELECTRIC BATTERIES ♦ ELECTRIC CONDUCTIVITY ♦ ELECTROCHEMISTRY ♦ ELECTRODES ♦ ELECTROLYTES ♦ ELECTRON TRANSFER ♦ ENERGY STORAGE ♦ GRAPHENE ♦ LITHIUM IONS ♦ LITHIUM TITANATES ♦ MASS ♦ MICROWAVE RADIATION ♦ POROUS MATERIALS ♦ STABILITY ♦ SYNTHESIS
Abstract Graphical abstract: We developed a new Novel lithium titanate-graphene nanohybrid containing two graphene conductive frameworks. The unique architecture creates fast electron transfer and rapid mass transport of electrolyte. The hybrid electrode provides excellent electrochemical performances for lithium-ion batteries, including high specific capacity, outstanding rate capability and intriguing cycling stability. - Highlights: • We reported a new LTO-graphene nanohybrid containing two graphene conductive frameworks. • One graphene framework greatly improves the electrical conductivity of LTO crystal. • Another graphene framework enhances electrical conductivity of between LTO crystals and electrolyte transport. • The unique architecture creates big tap density, ultrafast electron transfer and rapid mass transport. • The hybrid electrode provides excellent electrochemical performance for lithium-ion batteries. - ABSTRACT: The paper reported the synthesis of lithium titanate(LTO)-graphene hybrid containing two graphene conductive frameworks (G@LTO@G). Tetrabutyl titanate and graphene were dispersed in tertbutanol and heated to reflux state by microwave irradiation. Followed by adding lithium acetate to produce LTO precursor/graphene (p-LTO/G). The resulting p-LTO/G offers homogeneous morphology and ultra small size. All graphene sheets were buried in the spherical agglomerates composed of primitive particles through the second agglomeration. The p-LTO/G was calcined to LTO@graphene (LTO@G). To obtain G@LTO@G, the LTO@G was further hybridized with graphene. The as-prepared G@LTO@G shows well-defined three-dimensional structure and hierarchical porous distribution. Its unique architecture creates big tap density, fast electron transfer and rapid electrolyte transport. As a result, the G@LTO@G provides high specific capacity (175.2 mA h g{sup −1} and 293.5 mA cm{sup −3}), outstanding rate capability (155.7 mAh g{sup −1} at 10C) and intriguing cycling stability (97.2% capacity retention at 5C after 1000 cycles)
ISSN 00255408
Educational Use Research
Learning Resource Type Article
Publisher Date 2015-10-15
Publisher Place United States
Journal Materials Research Bulletin
Volume Number 70


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