Synthesis and application of ultra-long Na0.44MnO2 submicron slabs as a cathode material for Na-ion batteries

Novel ultra-long Na0.44MnO2 submicron slabs were fabricated through the sol-gel method, followed by high-temperature calcination. The material has a thickness ranging from 100 to 250 nm and a length varying from 10 mu m to 40 mu m. Electrochemical characterization indicates that the material can deliver a high capacity, larger than 120 mA h g(-1) with stable cycling over 100 cycles in assembled nonaqueous Na-ion cells, the good performance of which is mainly attributed to the reduced sodium ion diffusion distance.