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快充和超长稳定的高度互联Cu-Si合金纳米管锂离子电池阳极材料
发表时间：2017-09-30 浏览量：1695 下载量：316
| 全部作者： | 王鸿祥，宋虎成，林子夏，江小帆，余林蔚，徐骏，张晓伟，于忠卫，郑明波，刘一杰，何平，周豪慎，施毅，陈坤基 |
| 作者单位： | 南京大学电子科学与工程学院；南京大学现代工程与应用科学学院 |
| 摘 要： | 研究开发具有高比容量、高倍率性能及长循环稳定性的锂离子电池阳极材料对促进电动汽车和移动设备的推广使用至关重要。提出一种理想的制备方法——将CuO/a-Si核壳纳米线还原转换成高度互联的中空Si-Cu合金纳米管。在H2氛围下高温退火，CuO芯被还原成Cu，进而扩散至a-Si壳层（充当储能介质），并与之合金化形成Cu3Si纳米颗粒，提高了自身导电性，同时互联结构增强了机械稳定性。该阳极结构在没有使用任何导电添加剂的基础上，于3.4 A/g（20 A/g）电流密度下循环1 000次，依然保持1 005 mAh/g（775 mAh/g）高比容量，保持率高达84%（88%）. 更振奋人心的是，该合金纳米管结构可承受超高电流70 A/g（对应30 s充满一次电）快速充放电35次循环，仍然具有88%的比容量恢复率。这种性能优异的Si-Cu合金纳米管结构是实现高效快充Si基锂离子电压应用的理想候选者。 |
| 关 键 词： | 二次能源；能源储存和转化；Si-Cu合金纳米管；快充；锂离子电池 |
| Title： | Highly interconnected Cu-Si alloy nanotubes as fast charge and long stability anode materials for lithium-ion batteries |
| Author： | WANG Hongxiang, SONG Hucheng, LIN Zixia, JIANG Xiaofan, YU Linwei, XU Jun, ZHANG Xiaowei, YU Zhongwei, ZHENG Mingbo, LIU Yijie, HE Ping, ZHOU Haoshen, SHI Yi, CHEN Kunji |
| Organization： | School of Electronic Science and Engineering, Nanjing University; College of Engineering and Applied Sciences, Nanjing University |
| Abstract： | Seeking for materials with high capacity, high rate and durable anode for lithium-ion batteries has been a crucial aspect to promote the use of electric vehicles and other portable electronics. We here report a novel alloy-forming approach to convert amorphous Si (a-Si) coated CuO core-shell nanowires into hollow and highly-interconnected Si-Cu alloy (mixture) nanotubes. Upon a simple H2annealing, the CuO cores are reduced to Cu and diffuse out to the a-Si shell, alloying for Cu3Si nanoparticle and then producing highly-interconnected hollow Si-Cu alloy nanotubes, which can serve as high capacity and self-conductive anode structures with robust mechanicalsupport. A high specific capacity of 1 005 mAh/g (or 775 mAh/g) has been achieved after 1 000 cycles at 3.4 A/g (or 20 A/g), with a capacity retention rate of 84% (88%), without the use of any binder or conductive agent. Remarkably, they can survive extremely the fast charging rate at 70 A/g for 35 runs (corresponding to one full cycle in 30 s) and recover 88% capacity. This novel Si-Cu alloy-nanotube structure could represent as an ideal candidate to fulfill the true potential of Si-loaded lithium-ion voltage applications. |
| Key words： | secondary energy; energy storage and conversion; Si-Cu alloy nanotubes; fast charge; lithium-ion batteries |
| 发表期数： | 2017年9月第18期 |
| 引用格式： | 王鸿祥，宋虎成，林子夏，等. 快充和超长稳定的高度互联Cu-Si合金纳米管锂离子电池阳极材料[J]. 中国科技论文在线精品论文，2017，10（18）：2048-2056. |
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