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Hierarchical Carbon-Coated Ball-Milled Silicon: Synthesis and Applications in Free-Standing Electrodes and High-Voltage Full Lithium-Ion Batteries
ACS Nano ( IF 15.8 ) Pub Date : 2018-06-04 00:00:00 , DOI: 10.1021/acsnano.8b03312 Chenfei Shen 1 , Xin Fang 1 , Mingyuan Ge 2 , Anyi Zhang 1 , Yihang Liu 3 , Yuqiang Ma 3 , Matthew Mecklenburg 4 , Xiao Nie 1 , Chongwu Zhou 1, 3
ACS Nano ( IF 15.8 ) Pub Date : 2018-06-04 00:00:00 , DOI: 10.1021/acsnano.8b03312 Chenfei Shen 1 , Xin Fang 1 , Mingyuan Ge 2 , Anyi Zhang 1 , Yihang Liu 3 , Yuqiang Ma 3 , Matthew Mecklenburg 4 , Xiao Nie 1 , Chongwu Zhou 1, 3
Affiliation
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Lithium-ion batteries have been regarded as one of the most promising energy storage devices, and development of low-cost batteries with high energy density is highly desired so that the cost per watt-hour ($/Wh) can be minimized. In this work, we report using ball-milled low-cost silicon (Si) as the starting material and subsequent carbon coating to produce low-cost hierarchical carbon-coated (HCC) Si. The obtained particles prepared from different Si sources all show excellent cycling performance of over 1000 mAh/g after 1000 cycles. Interestingly, we observed in situ formation of porous Si, and it is well confined in the carbon shell based on postcycling characterization of the hierarchical carbon-coated metallurgical Si (HCC-M-Si) particles. In addition, lightweight and free-standing electrodes consisting of the HCC-M-Si particles and carbon nanofibers were fabricated, which achieved 1015 mAh/g after 100 cycles based on the total mass of the electrodes. Compared with conventional electrodes, the lightweight and free-standing electrodes significantly improve the energy density by 745%. Furthermore, LiCoO2 and LiNi0.5Mn1.5O4 cathodes were used to pair up with the HCC-M-Si anode to fabricate full cells. With LiNi0.5Mn1.5O4 as cathode, an energy density up to 547 Wh/kg was achieved by the high-voltage full cell. After 100 cycles, the full cell with a LiNi0.5Mn1.5O4 cathode delivers 46% more energy density than that of the full cell with a LiCoO2 cathode. The systematic investigation on low-cost Si anodes together with their applications in lightweight free-standing electrodes and high-voltage full cells will shed light on the development of high-energy Si-based lithium-ion batteries for real applications.
中文翻译：
分层碳涂层球磨硅：自由电极和高压全锂离子电池的合成及应用
锂离子电池已经被认为是最有前途的能量存储设备之一，并且迫切需要开发具有高能量密度的低成本电池，从而可以使每瓦特时的成本（$ / Wh）最小化。在这项工作中，我们报告使用球磨的低成本硅（Si）作为起始材料，随后进行碳涂层以生产低成本的分层碳涂层（HCC）Si。由不同的Si源制备的所得颗粒在1000次循环后均显示出超过1000mAh / g的优异循环性能。有趣的是，我们在原地观察基于分层碳包覆的冶金Si（HCC-M-Si）颗粒的循环后表征，它被很好地限制在碳壳中。此外，制造了由HCC-M-Si颗粒和碳纳米纤维组成的轻巧且自立的电极，经过100次循环后，电极的总质量达到了1015 mAh / g。与常规电极相比，重量轻且自立的电极可将能量密度显着提高745％。此外，使用LiCoO 2和LiNi 0.5 Mn 1.5 O 4阴极与HCC-M-Si阳极配对以制造完整的电池。含LiNi 0.5 Mn 1.5 O 4作为阴极，高压全电池可实现高达547 Wh / kg的能量密度。在100个循环之后，具有LiNi 0.5 Mn 1.5 O 4阴极的完整电池比具有LiCoO 2阴极的完整电池提供46％的能量密度。低成本Si阳极的系统研究及其在轻量级自立式电极和高压全电池中的应用将为实际应用中高能硅基锂离子电池的开发提供启发。
更新日期：2018-06-04
中文翻译：
分层碳涂层球磨硅：自由电极和高压全锂离子电池的合成及应用
锂离子电池已经被认为是最有前途的能量存储设备之一，并且迫切需要开发具有高能量密度的低成本电池，从而可以使每瓦特时的成本（$ / Wh）最小化。在这项工作中，我们报告使用球磨的低成本硅（Si）作为起始材料，随后进行碳涂层以生产低成本的分层碳涂层（HCC）Si。由不同的Si源制备的所得颗粒在1000次循环后均显示出超过1000mAh / g的优异循环性能。有趣的是，我们在原地观察基于分层碳包覆的冶金Si（HCC-M-Si）颗粒的循环后表征，它被很好地限制在碳壳中。此外，制造了由HCC-M-Si颗粒和碳纳米纤维组成的轻巧且自立的电极，经过100次循环后，电极的总质量达到了1015 mAh / g。与常规电极相比，重量轻且自立的电极可将能量密度显着提高745％。此外，使用LiCoO 2和LiNi 0.5 Mn 1.5 O 4阴极与HCC-M-Si阳极配对以制造完整的电池。含LiNi 0.5 Mn 1.5 O 4作为阴极，高压全电池可实现高达547 Wh / kg的能量密度。在100个循环之后，具有LiNi 0.5 Mn 1.5 O 4阴极的完整电池比具有LiCoO 2阴极的完整电池提供46％的能量密度。低成本Si阳极的系统研究及其在轻量级自立式电极和高压全电池中的应用将为实际应用中高能硅基锂离子电池的开发提供启发。
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