A high performance wire-shaped flexible lithium-ion battery based on silicon nanoparticles within polypyrrole/twisted carbon fibers
A high performance wire-shaped flexible lithium-ion battery based on silicon nanoparticles within polypyrrole/twisted carbon fibers
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DOI：
10.1039/c7ra02051a
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发表时间：
2017-05
期刊：
影响因子：
3.9
通讯作者：
Jiangyu Rao;Nishuang Liu;Luying Li;J. Su;F. Long;Z. Zou;Yihua Gao
中科院分区：
文献类型：
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作者：
Jiangyu Rao;Nishuang Liu;Luying Li;J. Su;F. Long;Z. Zou;Yihua Gao
目前，机械柔性和强电池是可弯曲和便携式设备的发展所需要的。为了满足这一要求，一个简单的和可扩展的合成柔性线形锂离子电池的阳极已开发出一个简单的一步原位聚合方法。聚吡咯生长在硅纳米颗粒表面，并附着在扭曲的碳纤维上。Si/PPy沿着碳纤维基体形成的交联结构提供了连续的电子传输网络和多孔结构，以调节充放电过程中Si颗粒的大体积变化。在制造线状Li离子电池时，发现互连的Si/PPy/CF混合电极提供了在柔性测试后容量降低3.9%的优异性能，大大提高了2287 mA h g-1的循环容量，并且在100次半电池测试循环后容量保持率约为75%。全湿法工艺为制备适用于电池制造的线状电极提供了一条有前途的途径。
Currently, mechanically flexible and strong batteries are desired for the development of bendable and portable devices. To meet this requirement, a simple and scalable synthesis of the anode for flexible wire-shaped lithium-ion batteries has been developed by a facile one-step in situ polymerization method. Polypyrrole was found to grow on the surface of Si nanoparticles and attach to twisted carbon fibers. The formed cross-linked structure of Si/PPy along with carbon fiber substrate offers a consecutive electron transport network and a porous structure to adjust large volumetric changes of Si particles during charging and discharging processes. On fabricating the wire-shaped Li-ion battery, the interconnected Si/PPy/CF hybrid electrode was found to offer an excellent performance of 3.9% capacity decrease after the flexibility test, a greatly improved cycling capacity of 2287 mA h g−1 and a capacity retention of about 75% after 100 cycles of the half-cell test. The all-wet methodology may provide a promising route for a new scalable way to produce applicable wire-shaped electrode in battery fabrication.