Application of monoclinic graphene-decorated Li₃V₂(PO₄)₃/C nanocrystals as an ultra-high-rate cathode for lithium-ion batteries

详细信息    查看全文

• 作者：Dalei Sun ; ^{sdlei80@163.com" class="auth_mail" title="E-mail the corresponding author} ; Jun Li ; Jijin Mai ; Yanxiong Fang
• 关键词：Lithium-ion batteries ; Cathode material ; Li3V2(PO4)3/C ; Conductive graphene ; Rate performance
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：1 May 2016
• 年：2016
• 卷：42
• 期：6
• 页码：7390-7396
• 全文大小：1712 K

文摘

A nanocomposite, consisting of conductive graphene intercalated with nanosized Li₃V₂(PO₄)₃/C hybrids, was successfully synthesized through a solution route followed by microwave irradiation. XRD results reveal that the crystal structure of graphene modified Li₃V₂(PO₄)₃/C remains unchanged. TEM images demonstrate that the Li₃V₂(PO₄)₃/C nanoparticles in the composite are well enwrapped by graphene. Compared to the pure Li₃V₂(PO₄)₃/C electrode, the graphene-decorated Li₃V₂(PO₄)₃/C nanocomposite exhibits an excellent high-rate capability and outstanding cycling stability. In the potential range of 3.0–4.8 V, it delivers a high initial discharge capacity of 189 mA h g⁻¹ at a low rate of 0.1 C, and maintains an initial discharge capacity of 143 at 10 C. The superior performance can be attributed to the synergetic effect of the nanosized Li₃V₂(PO₄)₃/C particles and the conductive graphene wrapping layers. Therefore, we believe that this strategy can be used for the preparation of other graphene-based cathode or anode materials for high-rate lithium-ion batteries.