Sulfur-doped graphene promoted Li4Ti5O12@C nanocrystals for lithium-ion batteries

Herein, sulfur-doped graphene modified Li4Ti5O12@C nanocomposite (SG-T@C) has been firstly fabricated via a sol-gel method assisted with solid-state route. In this composite, the Li4Ti5O12@C nanocrystals (T@C) are homogeneously dispersed into the two-dimensional sulfur-doped graphene. The introduced sulfur-doped graphene acted as conductive bridge within the resulted nanocomposite, thereby enhancing the electrical conductivity of T@C nanoparticles. The as-fabricated SG-T@C displays superior high-rate performance for lithium-ion batteries. It can deliver the capacities of 171.9 and 145.2 mAh/g at 0.1 and 10 C respectively. Besides, SG-T@C exhibits 96.2% capacity retention at 20 C over 800 cycles, demonstrating an excellent cycling stability. Therefore, the designed SG-T@C can be used as an advanced electrode for lithium-ion batteries.