Lu Y.,Harbin Institute of Technology |
Lu Y.,Harbin Engineering University |
Lu Y.,Chaowei Power Co. |
Wang X.,Harbin Engineering University |
And 4 more authors.
Harbin Gongye Daxue Xuebao/Journal of Harbin Institute of Technology | Year: 2016
In order to explore the positive material with excellent cycling ability and good safety, the effects of co-mixed ratios(10:0, 8:2, 7:3, 6:4, 5:5, 0:10) of LiNi0.4Co0.2Mn0.4O2 with LiMn2O4 as the positive material of lithium ion battery on the first discharging properties, cycling abilities, rate capabilities, impedance spectroscopy and cyclic voltammetry were investigated. The co-mixed electrode materials were also characterized by SEM. The results indicated that the co-mixed ratio affected the electrochemical performances of the co-mixed materials. The materials with the ratios of 8:2,7:3 and 6:4 showed higher specific volumetric capacity, better cyclic and rate performances than that of LiNi0.4Co0.2Mn0.4O2 and LiMn2O4 materials. The co-mixed material with the ratio of 8:2 is the best. © 2016, Editorial Board of Journal of Harbin Institute of Technology. All right reserved.
Lv Y.-Z.,Harbin Engineering University |
Tang D.-D.,Harbin Engineering University |
Xu D.,Chaowei Power Co. |
Jin Y.-Z.,Harbin Engineering University |
And 7 more authors.
RSC Advances | Year: 2014
The electrochemical performance of Mg-8Li-0.5Zn electrode in 0.7 mol L-1 NaCl solution with different concentrations of NaF (0.0, 0.2, 0.5, 0.8, 1.0, 1.2 and 1.5 mmol L-1) was investigated by means of potentiodynamic polarization, potentiostatic current-time curves, electrochemical impedance spectroscopy, scanning electron microscopy and utilization efficiencies. The findings indicate that Mg-8Li-0.5Zn electrode in 0.7 mol L-1 NaCl solution with 1.0 mmol L-1 NaF has a higher discharge current density than that in 0.7 mol L-1 NaCl solution with the other concentrations of NaF that were investigated. The addition of 1.0 mmol L-1 NaF to the NaCl electrolyte solution loosens the product film and the oxidation products on the alloy surfaces of the electrode, which produces deeper and larger channels, as observed by the SEM investigation, compared with those in 0.7 mol L-1 NaCl solution without any NaF. The addition of 1.0 mmol L-1 NaF in 0.7 mol L-1 NaCl solution improves the continuous discharging utilization efficiency of Mg-8Li-0.5Zn electrode by more than 18.80%, and enhances the interval discharge utilization efficiency of Mg-8Li-0.5Zn electrode by more than 27.90%. © 2014 The Royal Society of Chemistry.
Huang T.,Fuzhou University |
Ou W.,Fuzhou University |
Feng B.,Fuzhou University |
Huang B.,Fuzhou University |
And 3 more authors.
Journal of Power Sources | Year: 2012
A cell with tall plates was simulated by two cells and the controlled voltage with time was successfully used to measure the response current-time curves. It indicates that the current in the upper part of the plate is much higher than that in the lower part in early stage of the discharge, but in late stage, it is reversed, especially at high discharge rates. The upper part of the plate has higher capacity and deeper depth of discharge (DOD) so that the active mass degrades and sheds more quickly in cyclic applications. In the initial discharge, the lead sulfate formed at positive plates produces the internal stress and enhances the electric connection among the active mass particles. But the positive active mass only contributes a little to the conductivity of plates. The negative active mass with a bit shrinking but no passivation has better conductivity than the expanded active mass. The higher ohmic polarization of the active mass appears at higher discharge rates, in the upper part of the plates, in the late stage of the discharge, in aged battery, especially for negative plates. © 2012 Elsevier B.V. All rights reserved.
Sun X.,Fuzhou University |
Zhao J.,Fuzhou University |
Chen T.,Chaowei Power Co. |
Liu X.,Chaowei Power Co.
Journal of Solid State Electrochemistry | Year: 2015
Commercial-grade fumed silica was dispersed by mechanical shearing and/or ultrasonic force to produce dispersed silica particles with different sizes. The light-scattering technique and a diagrammatic method of extrapolation used to eliminate the influence of particle interaction were applied to determine the size of the particles. Then, the effect of particle size on the gelation of fumed silica in sulphuric acid medium, as well as some electrochemical properties, such as ion transfer and redox capacities of lead, in the gelled electrolyte were examined. The results showed that the size of dispersed particles affected the gelation of fumed silica itself: with increasing size, the thixotropy of the system increased and the gelling time decreased, particularly for those particles obtained only by simple stirring. The strength of the gel increased with increasing particle size. At an identical silica content, the increase in particle size led to a decrease in the density of the particles: this weakened the three-dimensional structure of the silica particle network and reduced the efficiency of ion transfer. However, the effect of silica particle size on the redox capacities of lead was negligible. © 2015 Springer-Verlag Berlin Heidelberg
Zeng Y.,Fuzhou University |
Hu J.,Fuzhou University |
Ye W.,Fuzhou University |
Zhao W.,Chaowei Power Co. |
And 2 more authors.
Journal of Power Sources | Year: 2015
The battery temperature, H2SO4 distribution, Pb2+ ion concentration and composition of the plates during the plate soaking of the 12 V 12 Ah valve-regulated lead-acid (VRLA) battery are studied. A simulated cell composed by two pure Pb plates and the absorptive glass mat (AGM) separator is used to investigate the growth of the lead dendrite in the separator, which is verified by analyzing the faulty batteries after the formation and the failure batteries after the usage. It is found that the H2SO4 is exhausted very quickly after filling and the separator near the plates can become neutral during soaking. Low acidity, high temperature and small PbSO4 particle size will increase the Pb2+ ion concentration. Higher Pb2+ ion concentration makes more PbSO4 tend to deposit on the coarse glass fibers, develop along them and even enwrap the entire fiber. And the fine PbSO4 crystals are continually transformed into large PbSO4 crystals via dissolution-deposition. In the subsequent charge, these PbSO4 crystals will be reduced to the club-shaped lead dendrites and may lead to short circuit of the battery. © 2015 Elsevier B.V. All rights reserved.
Chaowei Power Co. | Date: 2015-08-12
Batteries, electric, for vehicles; accumulators, electric, for vehicles; battery boxes; plates for batteries; batteries for lighting; battery chargers; batteries, electric; accumulators, electric; photovoltaic cells; solar batteries.
Chaowei Power Co. | Date: 2016-12-28
Electric drives for vehicles; Suspension shock absorbers for vehicles; Motors, electric, for land vehicles; Electric cars; Transmissions, for land vehicles; Electrically-powered motor vehicles; Bicycles; Safety seats for children, for vehicles; Anti-theft alarms for vehicles; Tyres for vehicle wheels.