Raising Lithium Storage Performances of NaTi2(PO4)3 by Nitrogen and Sulfur Dual-Doped Carbon Layer

NaTi2(PO4)(3) as anode exhibits promising prospects in aqueous lithium ion battery due to the open frame and good stability. In this paper, N/S dual-doped carbon encapsulated NaTi2(PO4)(3) nanoparticle (NTP@CNS) as anode for aqueous lithium ion battery has been successfully fabricated through sol-gel method followed by calcination treatment. Benefiting from the unique carbon layer doped nitrogen and sulfur, NTP@CNS shows excellent electrochemical property. It delivers discharge capacity of 119.4, 101.5, and 84.5 mAh g(-1) at 0.5, 7.0, and 15 C, separately, increasing by 10, 30.5, and 51.2 mAh g(-1) compared to original sample. Moreover, NTP@CNS demonstrates capacity retention of 83.4% after 1000 cycles at 6 C. The excellent property of NTP@CNS is because N/S dual-doping raises electronic conductivity of the sample, and also forms a lot of defects on the electrode surface. This can accelerate Li ion intercalation/deintercalation and electron transfer. N/S dual-doped carbon encapsulation for NaTi2(PO4)(3) offers an efficacious and hopeful strategy to ameliorate electrochemical performance of anode. (C) 2020 The Electrochemical Society ("ECS"). Published on behalf of ECS by IOP Publishing Limited.