N-DOPED POROUS CARBON DERIVED FROM COPPER-BASED METAL ORGANIC FRAMEWORK AS ANODE MATERIALS FOR LITHIUM-ION BATTERIES

摘要

Lithium-ion batteries (LIBs) are believed to be a promising power-source for electric vehicles [1 ]. However its application is limited by relative low capacity. Among all kinds of carbon materials, N-doped is considered to be one of the most simple and efficient way to improve the capacity. Recently, N-doped porous carbon (NPC) has attracted much attention owning to i ts unique structure and excellent properties [2]. However, facile preparation of porous carbon with high N-doped content remains a big challenge until now. Herein, we prepared a novel porous carbon material with high content of nitrogen doped by a facile heat treatment of a copper-based metal organic framework (Cu-MOF) using hexamine and copper nitrate as precursors. When used as anode materials for LIBs, the N-doped porous carbon exhibits a specific capacity of 737 mAh/g at the current density of 50 mA/g, and still owns a capacity of 588mAh/g after 60 cycles. The better electrochemical performance should attribute to that the high N co ntent is beneficial to enhance the compatibility between porous carbon and electrolyte solution [3]. Therefore, the porous carbon with high N-doped content is expected to replace the commercial graphite as a promising anode material for LIBs.