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首页> 外文期刊>RSC Advances >Nanostructured diatom earth SiO2 negative electrodes with superior electrochemical performance for lithium ion batteries
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Nanostructured diatom earth SiO2 negative electrodes with superior electrochemical performance for lithium ion batteries

机译：纳米结构硅藻土SiO2负电极具有卓越的锂离子电池电化学性能

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Diatomaceous earth (DE) is a naturally occurring silica source constituted by fossilized remains of diatoms, a type of hard-shelled algae, which exhibits a complex hierarchically nanostructured porous silica network. In this work, we analyze the positive effects of reducing DE SiO _(2) particles to the sub-micrometer level and implementing an optimized carbon coating treatment to obtain DE SiO _(2) anodes with superior electrochemical performance for Li-ion batteries. Pristine DE with an average particle size of 17 μm is able to deliver a specific capacity of 575 mA h g ~(?1) after 100 cycles at a constant current of 100 mA g ~(?1) , and reducing the particle size to 470 nm enhanced the reversible specific capacity to 740 mA h g ~(?1) . Ball-milled DE particles were later subjected to a carbon coating treatment involving the thermal decomposition of a carbohydrate precursor at the surface of the particles. Coated ball-milled silica particles reached stable specific capacities of 840 mA h g ~(?1) after 100 cycles and displayed significantly improved rate capability, with discharge specific capacities increasing from 220 mA h g ~(?1) (uncoated ball-milled SiO _(2) ) to 450 mA h g ~(?1) (carbon coated ball-milled SiO _(2) ) at 2 A g ~(?1) . In order to trigger SiO _(2) reactivity towards lithium, all samples were subjected to an electrochemical activation procedure prior to electrochemical testing. XRD measurements on the activated electrodes revealed that the initial crystalline silica was completely converted to amorphous phases with short range ordering, therefore evidencing the effective role of the activation procedure.
机译：硅藻土（DE）是由硅藻的僵化遗体构成的天然存在的二氧化硅源，一种硬壳藻类，其表现出复杂的分层纳米结构多孔二孔网络。在这项工作中，我们分析将DE SiO _（2）颗粒的正效应分析到亚微米水平，并实施优化的碳涂层处理，以获得具有卓越电化学性能的DE SiO_（2）阳极对锂离子电池的阳极性能。平均粒径为17μm的原始DE能够在100mA g〜（α1）的恒定电流下100次循环后提供575 mA Hg〜（α1）的特定容量，并将粒径降至470 NM增强了可逆的特定容量至740 mA hg〜（？1）。较晚的球磨颗粒介于碳涂层处理，涉及含有碳水化合物前体的热分解颗粒表面的碳水化合物前体。涂层球磨二氧化硅颗粒在100次循环后达到840 mA Hg〜（α1）的稳定特异性容量，并显示出显着提高的速率能力，从220 ma hg〜（α1）增加的放电特定容量增加（未涂覆的球磨sio _ （2））至450 mA Hg〜（α1）（碳涂覆球磨SiO _（2）），在2 a g〜（α1）。为了引发SiO_（2）对锂的反应性，在电化学测试之前对所有样品进行电化学活化程序。在活性电极上的XRD测量显示，初始结晶二氧化硅完全转化为具有短范围排序的无定形相，因此证明了活化程序的有效作用。

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