New Energy and Materials Laboratory NEML

Shanghai, China

New Energy and Materials Laboratory NEML

Shanghai, China
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Qu Q.,New Energy and Materials Laboratory NEML | Li L.,New Energy and Materials Laboratory NEML | Tian S.,New Energy and Materials Laboratory NEML | Guo W.,New Energy and Materials Laboratory NEML | And 2 more authors.
Journal of Power Sources | Year: 2010

Studies of the electrochemical behavior of K0.27MnO2·0.6H2O in K2SO4 show the reversible intercalation/deintercalation of K+-ions in the lattice. An asymmetric supercapacitor activated carbon (AC)/0.5 mol l-1 K2SO4/K0.27MnO2·0.6H2O was assembled and tested successfully. It shows an energy density of 25.3 Wh kg-1 at a power density of 140 W kg-1; at the same time it keeps a very good rate behavior with an energy density of 17.6 Wh kg-1 at a power density of 2 kW kg-1 based on the total mass of the active electrode materials, which is higher than that of AC/0.5 mol l-1 Li2SO4/LiMn2O4. In addition, this asymmetric supercapacitor shows excellent cycling behavior without the need to remove oxygen from the electrolyte solution. This can be ascribed in part to the stability of the lamellar structure of K0.27MnO2·0.6H2O. This asymmetric aqueous capacitor has great promise for practical applications due to high energy density at high power density. © 2009 Elsevier B.V. All rights reserved.


Zhao N.H.,New Energy and Materials Laboratory NEML | Yang L.C.,New Energy and Materials Laboratory NEML | Zhang P.,New Energy and Materials Laboratory NEML | Wang G.J.,New Energy and Materials Laboratory NEML | And 3 more authors.
Materials Letters | Year: 2010

One-dimensional (1D) SnO2 nanowires, coated by in situ formed amorphous carbon nanotubes (a-CNTs) with a mean diameter of ca. 60 nm, were synthesized by annealing the anodic alumina oxide (AAO) filled with a sol of SnO2. X-ray diffraction (XRD) and selected area electron diffraction (SAED) patterns revealed that the prepared SnO2 nanowires exist in polycrystalline rutile structure. The coating of carbon nanotubes has some defects on the wall after the internal SnO2 nanoparticles were removed. The 1D SnO2 nanowires present a reversible capacity of 441 mAh/g and an excellent cycling performance as an anode material for lithium ion batteries. This suggests that 1D nanostructured materials have great promise for practical application. © 2010 Elsevier B.V. All rights reserved.


Yang L.C.,New Energy and Materials Laboratory NEML | Yang L.C.,Fudan University | Gao Q.S.,New Energy and Materials Laboratory NEML | Gao Q.S.,Fudan University | And 6 more authors.
Electrochemistry Communications | Year: 2010

Mesoporous Ge was prepared by mechanochemical reaction of GeO2 and Mg powders followed by an etching process with HCl solution. It was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and charge-discharge measurement. With a pore-distribution concentrated around 10 nm, the product presents a BET surface area of 49.98 m2/g. When using as an anode material for lithium ion battery, the mesoporous Ge exhibits a reversible capacity of 950 mA h/g and retains a capacity of 789 mA h/g after 20 cycles at a current density of 150 mA/g. The cycleability is significantly improved compared with non-porous Ge. © 2010 Elsevier B.V. All rights reserved.

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