Structure and electrochemical properties of C-coated Li2O–V2O5–P2O5 glass-ceramic as cathode material for lithium-ion batteries

A series of glass cathode materials x Li 2 O–50V 2 O 5 –(50− x )P 2 O 5 ( x = 2 0 , 25, 30, 35 and 40) have been synthesized by a simple melting–quenching method. 30Li 2 O–50V 2 O 5 –20P 2 O 5 glass (LVP30) shows the best cycling performance with a preferable capacity retention after 50 cycles. Then, we prepared a series of carbon-coated LVP30 glass-ceramic cathode materials by carbon coating and heat treatment. The carbon-coated LVP30 samples consist of the crystalline phase V 2 O 3 , VO 2 and Li 2 O–V 2 O 5 –P 2 O 5 glass. Among the carbon-coated LVP30 samples, LVP30-15C sample exhibits the best cycling and rate performance. It can retain a discharge capacity of 140 mAh ⋅ g − 1 after 100 cycles. This unique glass-ceramic structure can result in good conductivity and structural ductility.