Zhao Mingshu, Zhang Weigang, Song Xiaoping
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.
Dalton Trans. 2017 Mar 21;46(12):3857-3863. doi: 10.1039/c7dt00199a.
The micromorphologies of NaVO materials 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). NaVO has 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, 3 × 10, 7.6 × 10 cm s, respectively, from the Warburg spectrum, which were three orders of magnitude larger than in conventional lithium-ion batteries. Furthermore, NaVO materials used in this ARLB have a high energy density of about 134.9 Wh kg at a power of 640 W kg. 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.
采用水热法和煅烧法合成的NaVO材料的微观形貌包括交错的微/纳米片状形状。这些材料可作为水系可充电锂离子电池（ARLB）的负极活性材料。在ARLB中，NaVO的电荷转移电阻为几欧姆，比传统锂离子电池小一个数量级。根据Warburg谱计算，相对于饱和甘汞电极（SCE），在0.15、-0.21和-0.65 V时锂离子扩散系数分别为7.3×10⁻¹⁰、3×10⁻¹⁰、7.6×10⁻¹⁰ cm² s⁻¹，比传统锂离子电池大三个数量级。此外，该ARLB中使用的NaVO材料在功率为640 W kg⁻¹时具有约134.9 Wh kg⁻¹的高能量密度。与传统锂离子电池的行为相反，我们发现合成材料的容量保持率和库仑效率随着ARLB放电电流密度的增加而增加，这表明这种新型ARLB系统在大规模储能和电源设备领域具有应用潜力。
