Nickel-iron layered double hydroxides and reduced graphene oxide composite with robust lithium ion adsorption ability for high-capacity energy storage systems
作者： Meng Zhang , Zengxi Wei , Tao Wang , Shoaib Muhammad , Jian Zhou
DOI: 10.1016/J.ELECTACTA.2018.11.058
关键词:
摘要: Abstract Rationally designed electrode materials with high capacity, excellent stability, and good rate capability are essential for high-performance energy storage systems. This study reported the design of nickel-iron layered double hydroxides nanosheets reduced graphene oxide composites (NiFe-LDHs/rGO composites) high-capacity LIB electrode. The NiFe-LDHs/rGO were prepared by adsorption Ni2+ Fe3+ ions onto (GO) surface, co-deposition NiFe-LDHs from adsorbed in alkaline solution, reduction GO into rGO. In composites, a large interlayer spacing 7.55 A proper Li+ ion (−4.36 eV) greatly facilitate reversible transport abundant ions. Meanwhile, outer rGO wrappings offer highly conductive matrix as efficient electron pathways. With these advantages, demonstrated cyclic stability 602.8 mAh g−1 capacity remained over 80 charge/discharge cycles at current density 500 mA g−1. Thus, our studies low-cost material LIBs.
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