太陽能電池回收矽廢料在鋰離子電池負極材料的應用

Application of Solar Cell Recycling Si Waste Material of Si(nano)G/C Composite Anode of Lithium Ion Batteries

10.30069/MM.201809_62(3).0008

謝政哲(C. C. Hsieh)；劉偉仁(W. R. Liu)

矽 ； 碳披覆 ； 負極 ； 鋰離子電池 ； Si ； anode ； carbon coating ； Li ion battery

鑛冶：中國鑛冶工程學會會刊

62卷3期（2018 / 09 / 01）

65 - 70

繁體中文

本研究是開發一種高容量鋰離子電池負極材料，本研究之五大亮點包括(1)利用回收矽廢料與瀝青做結合降低製備成本；(2)透過不同含量的碳批覆來提升矽的循環穩定性；(3)透過高能球磨將矽顆粒由微米降到奈米等級；(4)結合石墨與石墨烯更進一步提升矽負極材料能量密度；(5)在0.5 C的測試下可以維持120圈700 mAh/g的電容量，維持率依舊77%。本篇研究將針對球磨前、球磨後、碳披覆與碳材的添加，透過XRD、SEM、粒徑、TEM與充放電測試等分析工具下分別探討矽球磨前後的顆粒大小變化，碳披覆後在充放電測試下的影響與添加碳材後對於碳矽複合材料的的影響。經研究證實透過濕式球磨可以輕易將矽球磨至100 nm，透過15%的碳披覆可以讓矽具有良好的充放電穩定性，更進一步添加碳材後可以有效提升快充能力，達到120圈的77%保持率，此研究於未來中有機會應用在電動車或是需高能量的行動裝置上。

In this study, we proposed to synthesize Si(nano) G/C composite material for high-capacity lithium-ion batteries. There were five highlights of this study: (1) we used the Si waste from solar cell waste to reduce the cost of preparation; (2) enhanced the electrode cyclability by different content of carbon coatings; (3) decreased Si particles by high-energy ball milling; (4) combined with graphite to enhance the energy density; and (5) maintained 120 cycles of 700 mAh at 0.5 C at 77% capacity retention. Our research focused on bare Si analysis, ball milling, carbon coating and the addition of carbon materials by XRD, SEM, particle size, TEM, charge and discharge analysis. SEM results indicated that the particle of nano Si about 200-100 nm. Si(nano)G/C composite delivered a high reversible capacity of 700 mAh/g after 100 cycles at 0.5 C, which was much higher than that of bare Si of 100 mAh/g after 100 cycles at 0.5 C. The anode material can be used on mobile phone and electric vehicle.

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