In situ growth-optimized synthesize of Al-MOF@RGO anode materials with long-life capacity-enhanced lithium-ion storage

Low lithium ions transport capacity, poor electronic conductivity and the structural stability of metal organic frameworks (MOFs) severely restrict the development of practical lithium-ion batteries (LIBs). Therefore, many researchers were motivated to conduct investigations from the direction of both pore size regulation and composite synthesize for MOF-based materials. In the present work, the Al-MOF (Al(OH)[O2C-C6H4-CO2]) particles with well-developed pore structures were conceived. They were optimized by adjusting the hydrothermal selfassembly reaction time and temperature, particularly when the pore size increased from micropores to mesopores, which greatly improves the transport capacity of lithium ions. Then, the in-situ growth-optimized Al-MOF particles on the reduced graphene oxide (RGO) layer can effectively improve electronic conductivity and structural stability through the dual regulation of electrostatic attraction and heterogeneous nucleation. The RGO-supported Al-MOF@RGO anode used in LIBs exhibits a specific capacity of 468.5 mAh/g after 1000 cycles at a current density of 1.0 A/g. The specific capacity of the Al-MOF@RGO anode is still as high as 282.0 mAh/g after 1000 cycles even at 2.0 A/g. As expected, the in-situ growth-optimized synthesize of the Al-MOF@RGO anode with a long-life capacity-enhanced trend shows superior lithium storage performance. The AlMOF@RGO//LiFePO4 full cell measurement demonstrates its potential of commercial applications in LIBs.

Automated summary

The transport capacity of lithium ions in metal organic frameworks (MOFs) is improved by optimizing the pore structure and enhancing electronic conductivity through the growth of Al-MOF particles on reduced graphene oxide (RGO) layer. The optimized Al-MOF@RGO anode exhibits high specific capacity after 1000 cycles, indicating its potential for commercial applications in lithium-ion batteries (LIBs).