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首页> 外文期刊>RSC Advances >3D interconnected hierarchically macro-mesoporous TiO2 networks optimized by biomolecular self-assembly for high performance lithium ion batteries
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3D interconnected hierarchically macro-mesoporous TiO2 networks optimized by biomolecular self-assembly for high performance lithium ion batteries

机译：3D互连的分层宏观 - 中孔TiO2通过用于高性能锂离子电池的生物分子自组装优化的网络

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摘要

Biomolecular self-assembly is an effective synthesis strategy for material fabrication with unique structural complexity and properties. For the first time, we integrate inner-particle mesoporosity in a three-dimensional (3D) interconnected macroporous TiO _(2) structure via the mediation of biomolecular self-assembly of the lipids and proteins from rape pollen coats and Pluronic P123 to optimize the structure for high performance lithium storage. Benefitting from the hierarchically 3D interconnected macro-mesoporous structure with high surface area, small nanocrystallites and good electrolyte permeation, such a unique porous structure demonstrates superior electrochemical performance, with high initial coulombic efficiency (94.4% at 1C) and a reversible discharge capacity of 161, 145, 127 and 97 mA h g ~(?1) at 2, 5, 10 and 20C for 1000 cycles, with 79.3%, 89.9%, 90.1% and 87.4% capacity retention, respectively. Using SEM, TEM and HRTEM observations on the TiO _(2) materials before and after cycling, we verify that the inner-particle mesoporosity and the Li _(2) Ti _(2) O _(4) nanocrystallites formed during the cycling process in interconnected macroporous structure greatly enhance the cycle life and rate performance. Our demonstration here offers opportunities towards developing and optimizing hierarchically porous structures for energy storage applications via biomolecular self-assembly.
机译：生物分子自组装是具有独特结构复杂性和性质的材料制造的有效合成策略。首次，我们通过脂质和蛋白质的生物分子和蛋白质的中介，将内粒子渗透率整合在三维（3D）互连的大孔TiO _（2）结构中的互连的大孔TiO _（2）结构，并从强奸花粉涂层和Pluronic P123优化高性能锂储存的结构。具有高表面积，小纳米晶体和良好的电解质渗透的层次3D互连的宏观 - 中孔结构，这种独特的多孔结构具有优异的电化学性能，具有高初始库仑效率（94.4％在1C时）和可逆放电容量为161在2,5,10和20℃下，145,127和97 mA Hg〜（α1）为1000次循环，分别为79.3％，89.9％，90.1％和87.4％的容量保留。在循环之前和之后的TiO _（2）材料上使用SEM，TEM和HRTEM观察，我们确认在循环期间形成的内粒子介质和Li _（2）Ti _（2）O _（4）纳米晶体互联大孔结构的过程大大提高了循环寿命和速率性能。我们的演示提供了通过生物分子自组装开发和优化储能应用的分层多孔结构的机会。

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