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Energy technology: fully penetrating polypyrrole conductive network enhances lithium storage performance of bimetallic MOF derived znmno3 mesoporous microchips

wallpapers News 2020-09-28

has many advantages such as high theoretical specific capacity low DE intercalation voltage environment-friendly abundant reserves low price. Spinel znmno3 has become a potential anode material for lithium-ion batteries. However its low electronic conductivity the problems of material aggregation pulverization caused by volume expansion during cycling limit its application in the field of energy storage to a certain extent The application of. Therefore the structural design of znmno3 material has become an urgent problem.

recently the research group of former Changzhou professor of Jinan university designed synthesized a kind of mesoporous znmno3 microchip derived from bimetallic Zn Mn MOF constructed a three-dimensional continuous conducting network of PPy inside the mesoporous microchip through high-efficiency vapor phase polymerization so as to improve the electronic transport structural stability of the whole electrode material. The development potential of lithium-ion anode materials was discussed.

based on the recent research focus metal organic framework (MOF) the bimetallic Zn was prepared by the coordination assembly of metal ions organic ligs Mn MOF flake precursor can be controlled to obtain mesoporous znmno3 microchips by subsequent precise heat treatment. Based on the high-efficiency gas-phase polymerization strategy a three-dimensional continuous conductive network of PPy is constructed inside the mesoporous znmno3 to improve the electronic conductivity structural stability of the electrode materials. This kind of wood is a hybrid material( PPY@ZMO )The porous structure of the electrode material / electrolyte significantly improves the electroactive sites ion transport rate. The three-dimensional PPy conductive network effectively alleviates the volume change during the charge discharge process significantly improves the ion / electron transport in the electrode material. Based on this when used as anode material of lithium ion battery PPY@ZMO It shows excellent cycle stability reversible specific capacity. Half cell test shows that the hybrid electrode material has a capacity of 752.0 MAH g-1 at a current density of 2 a g-1 a reversible capacity of 1037.6 MAH g-1 after 220 cycles at a current density of 0.5 A g-1. When assembled with commercial lini0.8co0.1mn0.1o2 the device has a specific energy density of 206 whkg-1 which has a good application prospect. What's more the designed strategy is expected to be extended to other multi metal oxide / conductive polymer hybrid materials for accurate synthesis so as to provide ideal materials for electrochemical energy storage other fields.

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