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Lithium titanate anode for high-performance lithium-ion batteries using octadecylamine and folic acid-functionalized graphene oxide for fabrication of ultrathin lithium titanate nanoflakes and modification of binder

Abstract

The paper reports one strategy for fabrication of lithium titanate anode for high-performance lithium-ion batteries. Firstly, octadecylamine and folic acid co-functionalized graphene oxide is dispersed in tertbutanol. Then, adds tetrabutyl titanate and lithium acetate. The mixed solution is heated at 180◦C to form lithium titanate precursor, which is further treated by thermal annealing at 650◦C in Ar/H2. The resulted lithium titanate-graphene hybrid shows a three-dimensional structure. Ultra thin lithium titanate nanoflakes are enbeded in graphene sheets. The unique structure achieves to large specific surface and good conductivity. Furthermore, the graphen oxide is introduced into PVDF for binder modification. The PVDF-graphene oxide composite film exhibits a much higher elasticity modulus (>5 times), bigger lithium-ion diffusion coefficient (>1.5 times) and lower electron transfer impedance (>2 times) compared with single PVDF film. The as-prepared lithium titanate-graphene anode provides high specific capacity (222.4 mA h g-1 at 0.2 C), high-rate capability (112.1 mAh g-1 at 10 C) and cycling stability (99.6% capacity retention at 1 C after 1200 cycles) for lithium ion batteries.

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Publication details

The article was received on 24 Jun 2018, accepted on 03 Aug 2018 and first published on 06 Aug 2018


Article type: Paper
DOI: 10.1039/C8NJ03138J
Citation: New J. Chem., 2018, Accepted Manuscript
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    Lithium titanate anode for high-performance lithium-ion batteries using octadecylamine and folic acid-functionalized graphene oxide for fabrication of ultrathin lithium titanate nanoflakes and modification of binder

    L. Youjie, R. Li, Y. Yang and Z. Li, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C8NJ03138J

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