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Highly Ordered Carbon Coating Prepared with Polyvinylidene Chloride Precursor for High‐Performance Silicon Anodes in Lithium‐Ion Batteries
Batteries & Supercaps ( IF 5.1 ) Pub Date : 2020-10-29 , DOI: 10.1002/batt.202000193 Shuo Zhou 1 , Chen Fang 1 , Xiangyun Song 1 , Gao Liu 1
Batteries & Supercaps ( IF 5.1 ) Pub Date : 2020-10-29 , DOI: 10.1002/batt.202000193 Shuo Zhou 1 , Chen Fang 1 , Xiangyun Song 1 , Gao Liu 1
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A highly ordered carbon structure based on polyvinylidene chloride precursor has been developed to host silicon nanoparticles. The stoichiometric ratio of sacrificial H and Cl elements facilitated full utilization of the carbon content of the precursor that produced robust carbon coatings on silicon nanoparticles with excellent mechanic properties and electrochemical stabilities. The optimal sintering temperature and carbon content have been investigated. When evaluated as the anode of a lithium‐ion battery (LIB), the Si : C 1 : 2 composite sintered at 800 °C (SiC12‐800) provided excellent capacity retention of 85 % at 0.1 C after 50 cycles with an enhanced CE, which reached 99 % only after 10 cycles. The SiC12‐800 electrode maintained a specific capacity of 709.2 mAh/g after 300 cycles at 0.3 C, and delivered a high rate performance of 737.9 mAh/g and 485.6 mAh/g at 5 C and 10 C, respectively. The results indicate that polymer precursors with stoichiometric ratio of sacrificial elements have high potential for generating highly robust carbon coatings for silicon anodes in high energy density LIBs.
中文翻译：
聚偏二氯乙烯前驱体制备的用于锂离子电池高性能硅阳极的有序碳涂层
已经开发出基于聚偏二氯乙烯前体的高度有序的碳结构来容纳硅纳米颗粒。牺牲性H和Cl元素的化学计量比有助于充分利用前驱体的碳含量，该前驱体在硅纳米颗粒上产生了坚固的碳涂层，具有优异的机械性能和电化学稳定性。研究了最佳烧结温度和碳含量。当评估为锂离子电池（LIB）的阳极时，在800°C下烧结的Si：C 1：2复合材料（SiC12-800）在50次循环后，在0.1 C下具有出色的容量保持率85％，并具有增强的CE ，仅在10个循环后达到99％。SiC12-800电极在0.3 C下300次循环后仍保持709.2 mAh / g的比容量，并具有737的高倍率性能。在5 C和10 C下分别为9 mAh / g和485.6 mAh / g。结果表明，具有化学计量比的牺牲元素的聚合物前体具有高潜力，可在高能量密度的LIB中为硅阳极生成高度坚固的碳涂层。
更新日期：2021-01-05
中文翻译：
聚偏二氯乙烯前驱体制备的用于锂离子电池高性能硅阳极的有序碳涂层
已经开发出基于聚偏二氯乙烯前体的高度有序的碳结构来容纳硅纳米颗粒。牺牲性H和Cl元素的化学计量比有助于充分利用前驱体的碳含量，该前驱体在硅纳米颗粒上产生了坚固的碳涂层，具有优异的机械性能和电化学稳定性。研究了最佳烧结温度和碳含量。当评估为锂离子电池（LIB）的阳极时，在800°C下烧结的Si：C 1：2复合材料（SiC12-800）在50次循环后，在0.1 C下具有出色的容量保持率85％，并具有增强的CE ，仅在10个循环后达到99％。SiC12-800电极在0.3 C下300次循环后仍保持709.2 mAh / g的比容量，并具有737的高倍率性能。在5 C和10 C下分别为9 mAh / g和485.6 mAh / g。结果表明，具有化学计量比的牺牲元素的聚合物前体具有高潜力，可在高能量密度的LIB中为硅阳极生成高度坚固的碳涂层。
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