The research team of Professor Wang Chungang of Northeast Normal University reported a simple synthesis method of honeycomb layered microporous carbon nanospheres with large pore volume and uniform distribution

As we all know, lithium-ion batteries (LIBS) have been widely used in portable electronic devices and other devices Recently, due to the high content and low cost of sodium metal, sodium ion batteries (SIBS) have been widely concerned At present, many strategies have been proposed to develop anode materials for high performance LIBS and sibs Among them, red phosphorus (P), which has low cost and high theoretical capacity, is considered as the most promising negative candidate for LIBS and sibs However, red phosphorus has poor conductivity and huge volume change in the process of discharge / charge, resulting in poor kinetics, large polarization, low utilization of active substances, and sharp capacity degradation However, the combination of red phosphorus and porous carbon can not only improve the conductivity but also adapt to the volume change However, the single pore carbon materials can not meet the requirements because of the insufficient amount of red phosphorus loaded on it and the red phosphorus easy to permeate and block the pores, resulting in poor cycle performance and the reduction of electrode / electrolyte contact area Although the micropores in the graded mesoporous carbon materials can not only strongly adsorb the red phosphorus nanoparticles, but also limit the red phosphorus to the nanometer level However, most of the graded micro mesoporous carbon materials have uneven micropore distribution, which leads to the uneven size of red phosphorus nanoparticles, which is easy to cause agglomeration in the process of circulation Therefore, it is an effective way to improve the electrochemical properties of graded micro mesoporous carbon materials by forming uniform micropores to obtain uniform ultrafine red phosphorus Recently, Professor Wang Chungang and Associate Professor Li Lu of Northeast Normal University jointly reported a simple method for large-scale design and synthesis of honeycomb layered microporous carbon nanospheres (hhpcns) with large pore volume and uniform distribution Among them, the large pore volume provides enough space for red phosphorus loading and its volume expansion, and the uniform distribution of micropores enables red phosphorus to be loaded uniformly The hhpcnss / P composite shows very high capacity (at 0.1ag-1, LIBS and sibs are 2463.8 and 2367.6 Ma h g-1, respectively), excellent rate performance (at 10ag-1, LIBS and sibs are 842.2 and 831.1 Ma HG-1, respectively) and excellent cycle stability (at 2 and 5A g-1, LIBS are 1201.6 and 938.4 Ma HG-1, respectively, after 1000 cycles, while After 1000 cycles, sibs were 1269.4 and 861.8 Ma h g-1, respectively In addition, when used in combination with LiFePO 4 and Na 3V 2 (PO 4) 3 positive electrodes, the lithium / sodium ion battery shows high capacity, excellent rate and cycle performance, thus revealing the practicability of hhpcnss / P composite These excellent electrochemical properties are caused by honeycomb carbon network with large pore volume, graded micro mesoporous carbon nanostructure with uniform distribution, excellent conductivity and nanostructure stability, which are much better than the P / C materials reported for LIBS and sibs The research results were published on ACS Nano (DOI: 10.1021 / acsnano 9b07428), an international famous journal, entitled "capping red phosphorus in ultra large point volume hierarchical porus carbon nanospheres for lithium / medium ion half / full batteries".