Brighsun New Energy Pty Ltd

Keysborough, Australia

Brighsun New Energy Pty Ltd

Keysborough, Australia

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Guo Q.,Shanghai Institute of Technology | Chang C.,Shanghai Institute of Technology | Zhang D.,Shanghai Institute of Technology | Huang K.,Brighsun New Energy Pty Ltd
Journal of Alloys and Compounds | Year: 2017

New anode materials (Cox/Li3Ti4Co1−xCrO12) had been successfully prepared via a high temperature solid-state method. Pure phase Co-Cr replaced solid solution (Li3Ti4CoCrO12) was obtained by calcinating the precursor under air atmosphere while the Co modified solid solutions (Cox/Li3Ti4Co1−xCrO12) were prepared under a reducing atmosphere. Various methods, such as XRD, SEM, EDX mapping, cyclic testing, EIS, CV, XPS and EPR were employed to characterize the powder samples and investigate their electrochemical behavior. SEM results showed spherical shape of the products with nano sized primary crystals. EDX mapping further confirmed the different existence of the Co element, uniform distribution of Co2+ ions within the spinel lattice and separated metallic Co on the particle surface. Cyclic tests revealed that the Co modified samples showed great promotion in their electrochemical performance. For the sample with x = 0.1, the best results with an initial capacity of 157.6 mA h/g and a capacity retention of 96.4% after 100 runs were observed. Such promotion can be explained by the improved electronic conductivity and enhanced Li+ diffusion coefficient confirmed by the EIS and CV simulation, which was caused by the oxygen vacancy produced during the calcination under the reducing atmosphere. © 2016 Elsevier B.V.


Wang Y.,Shanghai Institute of Technology | Zhang D.,Shanghai Institute of Technology | Chang C.,Shanghai Institute of Technology | Deng L.,Shanghai Institute of Technology | Huang K.,Brighsun New Energy Pty Ltd
Materials Research Innovations | Year: 2015

A nanocrystalline spherical morphology LiFePO4/C composite material was synthesised by milling-assisted spray pyrolysis method using commercial LiOH•H2O, Fe, H3PO4 and glucose as raw materials. To optimise phase purity, the as-sprayed powder was calcined at 720°C in N2. In the ball milling process, the grain size of the LiFePO4/C was controlled at ∼ 100-300 nm. The samples were characterised by thermo-gravimetric analysis, X-ray diffraction and scanning electron microscopy. Electrochemical performance tests were investigated in terms of charge-discharge curves and cycling capacity by a battery test system (Land CT2001A). Results showed that the initial discharge capacity of the LiFePO4/C cathode at 0-2, 0-5 and 1 C was 166-2, 160-8 and 155-2 mAh g-1, respectively. The cycling capacity retention rate reached 99% after 20 cycles. This indicated that the obtained lithium-ion battery cathode material, lithium iron phosphate, has excellent electrochemical performance. © W. S. Maney & Son Ltd 2015.


Cai Y.,Shanghai Institute of Technology | Zhang D.,Shanghai Institute of Technology | Chang C.,Shanghai Institute of Technology | Sheng Z.,Shanghai Institute of Technology | Huang K.,Brighsun New Energy Pty Ltd
Ionics | Year: 2016

A comparison of electrochemical performance between LiFe0.4Mn0.595Cr0.005PO4/C and LiMnPO4/C cathode materials was conducted in this paper. The cathode samples were synthesized by a nano-milling-assisted solid-state process using caramel as carbon sources. The prepared samples were investigated by XRD, SEM, TEM, energy-dispersive X-ray spectroscopy (EDAX), powder conductivity test (PCT), carbon-sulfur analysis, electrochemical impedance spectroscopy (EIS), and galvanostatic charge-discharge cycling. The results showed that LiFe0.4Mn0.595Cr0.005PO4/C exhibited high specific capacity and high energy density. The initial discharge capacity of LiFe0.4Mn0.595Cr0.005PO4/C was 163.6 mAh g−1 at 0.1C (1C = 160 mA g−1), compared to 112.3 mAh g−1 for LiMnPO4/C. Moreover, the Fe/Cr-substituted sample showed good cycle stability and rate performance. The capacity retention of LiFe0.4Mn0.595Cr0.005PO4/C was 98.84 % over 100 charge-discharge cycles, while it was only 86.64 % for the pristine LiMnPO4/C. These results indicated that Fe/Cr substitution enhanced the electronic conductivity for the prepared sample and facilitated the Li+ diffusion in the structure. Furthermore, LiFe0.4Mn0.595Cr0.005PO4/C composite presented high energy density (606 Wh kg−1) and high power density (574 W kg−1), thus suggested great potential application in lithium ion batteries (LIBs). © 2016 Springer-Verlag Berlin Heidelberg


Wang Y.,Shanghai Institute of Technology | Zhang D.,Shanghai Institute of Technology | Chang C.,Shanghai Institute of Technology | Deng L.,Shanghai Institute of Technology | Huang K.,Brighsun New Energy Pty Ltd
Materials Chemistry and Physics | Year: 2014

Two different LiFePO4 microplates grown in parallel with (010) and (001) lattice planes were obtained using a controllable hydrothermal process. The as-synthesized materials were characterized physically and electrochemically. XRD, SEM and HRTEM investigations confirmed the preferred growth and two corresponding growth mechanisms based on nucleation and recrystallization process were proposed. The calculation of Li ion diffusion coefficient along [001] and [010] directions using CV and EIS results revealed that (010) microplates have a higher diffusion coefficient than the (001) ones, implying a good electrochemical performance for (010) microplates over the (001) ones. Capacity tests confirmed the above assumption. Both the two cathode materials showed high specific capacities, and the (010) microplates exhibit a value around 158 mAh g1 at a rate of 0.5C, showing a great advantage of (010) microplates for future application in LIBs for EV application. © 2014 Elsevier B.V. All rights reserved.


Guo Q.,Shanghai Institute of Technology | Zhang D.,Shanghai Institute of Technology | Chang C.,Shanghai Institute of Technology | Sheng Z.,Shanghai Institute of Technology | Huang K.,Brighsun New Energy Pty Ltd.
Materials Letters | Year: 2016

Ni modified spinel Li3Ti4NiCrO12 (Ni/Li3Ti4NiCrO12) anode material was synthesized by a simple high temperature solid-state reaction in a reducing atmosphere. The existence of metallic Ni not only changes the growth manner of the synthesized Ni/Li3Ti4NiCrO12, but also reduces the grain size, which further leads to a significant improvement in electric conductivity. Such Ni modified Li3Ti4NiCrO12 anode material showed excellent electrochemical behavior upon cyclic test, with a high initial capacity of 158.8 mA h/g and high capacity retention (97.2%) after 80 cycles. All the results confirmed the significance of metallic Ni in promoting the electrochemical behaviors of Li3Ti4NiCrO12, suggesting high potential of Ni/Li3Ti4NiCrO12 in future application. © 2015 Elsevier B.V. All rights reserved.

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