LiNi1/3Co1/3Mn1/3O2 cathode coated with a thin layer of graphene (~8nm) is successfully synthesized by self-assembly and pyrolysis of polyelectrolyte layers on the surface of NMC particles. The graphene coated NMCs still possess a layered structure with good crystallinity and demonstrate a superior electrochemical performance (e.g., rate capability and cycling stability). The best graphene coated NMC cathode is prepared at a calcination temperature of 800°C, exhibiting a capacity retention of ~90% vs. 78% for pristine NMC @ cycle 100 and 1C rate. The improvement in cycling performance is further enlarged after 500 cycles (74% vs. 51%). This can be attributed to the dual functions of graphene coating in enhancing electronic conductivity and protecting NMC surface from the contact with electrolyte during the electrochemical reaction.
BT - Ceramics International DA - 03/2017 DO - 10.1016/j.ceramint.2017.03.066 IS - 10 LA - eng N2 -LiNi1/3Co1/3Mn1/3O2 cathode coated with a thin layer of graphene (~8nm) is successfully synthesized by self-assembly and pyrolysis of polyelectrolyte layers on the surface of NMC particles. The graphene coated NMCs still possess a layered structure with good crystallinity and demonstrate a superior electrochemical performance (e.g., rate capability and cycling stability). The best graphene coated NMC cathode is prepared at a calcination temperature of 800°C, exhibiting a capacity retention of ~90% vs. 78% for pristine NMC @ cycle 100 and 1C rate. The improvement in cycling performance is further enlarged after 500 cycles (74% vs. 51%). This can be attributed to the dual functions of graphene coating in enhancing electronic conductivity and protecting NMC surface from the contact with electrolyte during the electrochemical reaction.
PY - 2017 SP - 7668 EP - 7673 ST - Ceramics International T2 - Ceramics International TI - Synthesis of LiNi1/3Mn1/3Co1/3O2@graphene for lithium-ion batteries via self-assembled polyelectrolyte layers VL - 43 SN - 02728842 ER -