A high-performance dual-ion cell utilizing Si nanosphere@graphene anode
A high-performance dual-ion cell utilizing Si nanosphere@graphene anode
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DOI：
10.1016/j.electacta.2018.07.030
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发表时间：
2018-08
影响因子：
6.6
通讯作者：
Shuai Wang;X. Xiao;Yanping Zhou;C. Fu;S. Jiao
中科院分区：
文献类型：
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作者：
Shuai Wang;X. Xiao;Yanping Zhou;C. Fu;S. Jiao
全球对高安全、低成本和高工作电压储能设备的需求日益增长，引发了人们对尖端锂离子电池以外的新型电池的极大兴趣。在本论文中，我们首先在LiPF6有机电解液中制备了一种新型的可充电双离子电池，其阴极为石墨，阳极为硅纳米球/石墨烯(Si-NS@G)。固定在硅纳米球表面的石墨烯薄膜可以适应硅纳米球的体积膨胀，提高其导电性。电池具有稳定的长期循环性能和优异的倍率性能，1000次循环后的放电容量为100mA h g−1，电流密度为100 mA g−1。此外，电池运行的高工作电压为>；4.2 V，从而实现了更高的能量密度。我们的结果可能为新的电化学电池技术和应用开辟新的范式。
The growing global demands of high-safety, low-cost and high working voltage energy storage devices trigger great interests in novel batteries beyond state-of-the-art lithium-ion battery. Herein, we firstly fabricate a novel rechargeable dual-ion cell with graphite cathode and Si nanosphere@graphene (Si-NS@G) composite anode in a LiPF6-based organic electrolyte. The graphene layers anchored onto Si nanospheres surface can accommodate the volume expansion and improve the electrical conductivity of Si nanospheres. The cell shows stable long-term cycling and excellent rate performance with a high discharge capacity of 100 mA h g−1at the current density of 100 mA g−1after 1000 cycles. Moreover, the cell operates a high working voltage of >4.2 V, enabling a higher energy density. Our result may open a new paradigm for novel electrochemical cell technologies and applications.