In situ synthesis of chemically bonded NaTi2(PO4)3/rGO 2D nanocomposite for high-rate sodium-ion batteries
NaTi2(PO4)3/reducedgraphene oxide (rGO)nanocomposite, chemical bonding, energy-efficiency, in situ synthesis, high-rate, sodium-ion batteries
A phase-pure NaTi2(PO4)3/reduced graphene oxide (rGO) nanocomposite wasprepared using a microwave-assisted one-pot method and subsequent heattreatment. The well-crystallized NaTi2(PO4)3 nanoparticles (30–40 nm) wereuniformly precipitated on rGO templates through Ti–O–C bonds. The chemicalinteractions between the NaTi2(PO4)3 nanoparticles and rGO could immobilizethe NaTi2(PO4)3 nanoparticles on the rGO sheets, which might be responsiblefor the excellent electrochemical performance of the nanocomposite. TheNaTi2(PO4)3/rGO nanocomposite exhibited a specific capacity of 128.6 mA·h·g–1approaching the theoretical value at a 0.1 C-rate with an excellent ratecapability (72.9% capacity retention at 50 C-rate) and cycling performance (only4.5% capacity loss after 1,000 cycles at a high rate of 10 C). These propertieswere maintained even when the electrodes were prepared without the use of anadditional conducting agent. The excellent sodium storage properties of theNaTi2(PO4)3/rGO nanocomposite could be attributed to the nano-sized NaTi2(PO4)3particles, which significantly reduced the transport lengths for Na+ ions, and anintimate contact between the NaTi2(PO4)3 particles and rGO due to chemicalbonding.
Tsinghua University Press
Ha-Kyung Roh,Hyun-Kyung Kim,Myeong-Seong Kim,Dong-Hyun Kim,Kyung Yoon Chung,Kwang Chul Roh,Kwang-Bum Kim, In situ synthesis of chemically bonded NaTi2(PO4)3/rGO 2D nanocomposite for high-rate sodium-ion batteries. NanoRes.2016, 9(6): 1844–1855