Author
Min Liu
Bio: Min Liu is an academic researcher from Xiangtan University. The author has contributed to research in topics: Mesoporous material & Scanning electron microscope. The author has an hindex of 12, co-authored 18 publications receiving 413 citations.
Papers
More filters
TL;DR: Hollow porous carbon spheres (HPCSs) with micro/mesoporous combination shell and macroporous core are prepared through a facile and efficient hydrothermal method by using silica nanospheres as hard template and furfuryl alcohol (FA) as carbon source as discussed by the authors.
112 citations
TL;DR: In this article, the boron-doped ordered mesoporous carbons (BOMCs) were used as a promising electrode material for the application of supercapacitors.
87 citations
TL;DR: The galvanostatic testing demonstrates that the electrochemical performances of lithium ion batteries (LIBs) are highly dependent on the morphology and size of Li1.2Ni0.13Mn0.54O2 cathode materials, and the olive-like morphology cathode material with suitable size exhibits much better Electrochemical performances compared with the other two cathodes materials.
Abstract: The controllable morphology and size Li-rich Mn-based layered oxide Li1.2Ni0.13Co0.13Mn0.54O2 with micro/nano structure is successfully prepared through a simple coprecipitation route followed by subsequent annealing treatment process. By rationally regulating and controlling the volume ratio of ethylene glycol (EG) in hydroalcoholic solution, the morphology and size of the final products can be reasonably designed and tailored from rod-like to olive-like, and further evolved into shuttle-like with the assistance of surfactant. Further, the structures and electrochemical properties of the Li-rich layered oxide with various morphology and size are systematically investigated. The galvanostatic testing demonstrates that the electrochemical performances of lithium ion batteries (LIBs) are highly dependent on the morphology and size of Li1.2Ni0.13Co0.13Mn0.54O2 cathode materials. In particular, the olive-like morphology cathode material with suitable size exhibits much better electrochemical performances comp...
72 citations
TL;DR: In this article, a dual-modification strategy of Mg substitution for transition metal in bulk structure and NaTi2(PO4)3 surface coating layer is designed to solve above defects.
41 citations
TL;DR: In this paper, the physicochemical and electrochemical properties of the Cr-doped Fe2F5·H2O cathode materials are systematically characterized, and the results indicate that the Crdoped materials not only reduce the crystalline size, but also remarkably enhance electronic conductivity.
31 citations
Cited by
More filters
TL;DR: In this article, a facile one-pot soft-templating and one-step pyrolysis method was used to synthesize carbon spheres with mesoporous structure and nitrogen doping for high-performance supercapacitor applications.
326 citations
30 Jan 2015
TL;DR: In this paper, the phase entropy as a function of lithium filling in the layered oxide was studied and the configuration multiplicity (number of ways the inserted lithium cations could be arranged in the host lattice) was analyzed.
Abstract: Phase entropy as a function of lithium filling in the layered oxide S = KB ln(Ω) , Boltzman configuration entropy With Ω the configuration multiplicity (number of ways the inserted lithium cations could be arranged in the host lattice). Under the reasonable assumption of indistinguishable lithium cations, the configuration multiplicity of N lithium cations into the host material with Ns effective total number of sites follows the combinatorial equation below: Notes by MIT Student (and MZB)
321 citations
255 citations
208 citations
TL;DR: In this paper, the authors employed in situ X-ray absorption spectroscopy (XAS), transmission electron microscopy (TEM), density-functional-theory (DFT) calculations, and galvanostatic intermittent titration technique (GITT) to first correlate the voltage profile of iron fluoride ($FeF_3$), a representative conversion electrode material, with evolution and spatial distribution of intermediate phases in the electrode.
Abstract: Metal fluoride and oxides can store multiple lithium-ions through conversion chemistry to enable high energy-density lithium-ion batteries. However, their practical applications have been hindered by an unusually large voltage hysteresis between charge and discharge voltage-profiles and the consequent low energy efficiency (< 80%). The physical origins of such hysteresis are rarely studied and poorly understood. Here we employ in situ X-ray absorption spectroscopy (XAS), transmission electron microscopy (TEM), density-functional-theory (DFT) calculations, and galvanostatic intermittent titration technique (GITT) to first correlate the voltage profile of iron fluoride ($FeF_3$), a representative conversion electrode material, with evolution and spatial distribution of intermediate phases in the electrode. The results reveal that, contrary to conventional belief, the phase evolution in the electrode is symmetrical during discharge and charge. However, the spatial evolution of the electrochemically active phases, which is controlled by reaction kinetics, is different. We further propose that the voltage hysteresis in the $FeF_3$ electrode is kinetic in nature. It is the result of Ohmic voltage drop, reaction overpotential, and different spatial distributions of electrochemically-active phases (i.e. compositional inhomogeneity). Therefore, the large hysteresis can be expected to be mitigated by rational design and optimization of material microstructure and electrode architecture to improve the energy efficiency of lithium-ion batteries based on conversion chemistry.
181 citations