Uniform coaxial CNT@Li2MnSiO4@C as advanced cathode material for lithium-ion battery

The rational design of the nano structure is crucial for overcoming the inherent defect and engineering high performance of Li2MnSiO4 cathode material. In the present study, uniform coaxial carbon nanotube CNT@Li2MnSiO4@C has been designed and synthesized by an efficient step-by-step strategy and applied as high-performance cathode for lithium ion battery. It is demonstrated that the product has a uniform coaxial structure, the thickness of Li2MnSiO4 shell and outermost carbon layer is about 20 nm and 4.5 nm, respectively. This properly design can effectively improve the electric conductivity, shorten the Li ion diffusion length, relax volume change upon charge/discharge and relieve the manganese dissolution. Benefit from its unique structural features, the CNT@Li2MnSiO4@C electrode material overcomes the intrinsic disadvantage of Li2MnSiO4 of poor electronic/ionic conductivity and fast capacity fading rate, and hence exhibiting promising improvement on reversible capacity and cycling properties.