Lithium-ion storage properties of a micro/nanosheet-like NaV6O15anode in aqueous solution.
The micromorphologies of NaV6O15materials synthesized using the hydrothermal method and calcination comprise staggered micro/nanosheet-like shapes. These materials can act as anode active materials in aqueous rechargeable lithium-ion batteries (ARLBs). NaV6O15has a charge transfer resistance of several ohms in the ARLB, which is an order of magnitude smaller than in traditional lithium-ion batteries. The lithium-ion diffusion coefficients at 0.15, -0.21 and -0.65 V vs. saturated calomel electrode (SCE) were calculated as 7.3 × 10-9, 3 × 10-12, 7.6 × 10-11cm2s-1, respectively, from the Warburg spectrum, which were three orders of magnitude larger than in conventional lithium-ion batteries. Furthermore, NaV6O15materials used in this ARLB have a high energy density of about 134.9 Wh kg-1at a power of 640 W kg-1. In contrast to traditional LIB behavior, we found that the capacity retention and coulombic efficiency of the as-synthesized materials increased with the increasing ARLB discharge current density, which showed potential for this new ARLB system to be applied in the field of large-scale energy storage and power source devices.
School of Science, MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, Key Laboratory of Shaanxi for Advanced Functional Materials and Mesoscopic Physics, Xi'an Jiaotong University, Xi'an, 710049, China. zhaomshu@mail.xjtu.edu.cn.
Mingshu
http://orcid.org/0000-0001-7229-4392
M
Zhao
School of Science, MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, Key Laboratory of Shaanxi for Advanced Functional Materials and Mesoscopic Physics, Xi'an Jiaotong University, Xi'an, 710049, China. zhaomshu@mail.xjtu.edu.cn.
Weigang
W
Zhang
School of Science, MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, Key Laboratory of Shaanxi for Advanced Functional Materials and Mesoscopic Physics, Xi'an Jiaotong University, Xi'an, 710049, China. zhaomshu@mail.xjtu.edu.cn.
Xiaoping
X
Song