Advanced energy materials: winding with carbon nanotubes CoP@C ⊂ carbon framework constructs hierarchical structure to realize efficient lithium storage

wallpapers Nicaragua News 2020-11-22

transition metal phosphide (TMP) based on conversion reaction mechanism has attracted more more attention due to its higher specific capacity than traditional intercalation materials. However due to the phase transition the large volume change in the reaction process the rapid capacity decay in the cycle process is often encountered. In addition the preparation of phosphides is much more difficult than metal oxides or sulfides toxic substances are generally produced in the synthesis process. In order to solve this series of problems people have made great efforts. An effective method is to assemble nanostructures composites with porous carbon framework which is conducive to the penetration of electrolyte slow down the expansion; it can also provide ion electron transport channels shorten the diffusion length so as to improve the reaction kinetics the stability of electrode structure.

recently Xi Baojuan School of chemistry chemical engineering Shong University has synthesized a carbon coated cobalt phosphide embedded in one-dimensional porous carbon composite by a self template autocatalytic strategy( CoP@C ⊂ PCF / ncnts) which has a multi-level hierarchical structure combines the advantages of carbon nanotubes one-dimensional porous micro nano materials achieves a better performance Good lithium storage performance. Compared with the previous preparation route the synthesis route of

has a certain breakthrough in material design. Carbon nanotubes (CNTs) were grown in situ in one-dimensional (1D) by Co nanoparticles CoP@C Core shell structure. The one-dimensional porous carbon framework is conducive to the rapid ion electron transport which can maintain the stability of the electrode structure effectively alleviate the volume expansion. The inner core-shell structure can prevent the aggregation of cop particles. The carbon nanotubes with in-situ growth on the surface provide the staggered conductive network to promote the electrolyte penetration charge transfer. Thanks to the unique multi-level nanostructure composition characteristics CoP@C ⊂ PCF / ncnts as anode materials for lithium ion batteries show excellent electrochemical storage performance including excellent cycling rate performance. The test results show that the discharge capacity of 712 MAH g − 1 can be obtained after 700 cycles at a current density of 0.5 A / g. when the current density is increased to 2 It can cycle more than 1000 cycles maintain a reversible capacity of 316 MAH g − 1. The specific capacity of 230.6 MAH / G can be maintained even at a high rate of 5 A / g. The capacity of the cell can be maintained at 0.2-113 mg / h. The researchers of

believe that the hierarchical structure construction method in this work which integrates the primary secondary structures not only provides a new idea for the synthesis of complex hierarchical structure with adjustable structure composition but also plays a certain role in improving the performance of related phosphorus based anode materials. The related work is supported by the National Natural Science Foundation of China the future plan for young scholars of Shong University the China Postdoctoral Science Foundation the Taishan Scholars project of Shong Province.

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