Applied Surface Science, Vol.399, 624-629, 2017
The preparation and graphene surface coating NaTi2(PO4)(3) as cathode material for lithium ion batteries
The graphene coated NaTi2(PO4)(3) has been fabricated via a simple sol-gel process followed by calcination. The NaTi2(PO4)(3)/graphene (NTP/G) composite is used directly as cathode electrode material for lithium ion battery and the electrochemical properties of the composite in this system is firstly studied in detail. In the charge-discharge process, two Li+ can occupy octahedral M (2) site and be reversibly intercalated into the 3D framework of NTP through the ion conduction channel where almost all of Na+ are immobilized to sustain the framework. At 5C rate, the capacity retention of the NTP/G composite after 800 cycles is still up to 82.7%. The superior electrochemical properties of NTP/G is ascribed to its stable 3-D framework and the enhanced electronic conduction resulting from the graphene sheets surface modification. (C) 2016 Elsevier B.V. All rights reserved.