The results show that below the rate of C/2, the voltage platform and capacity is not sensitive to the rate. When the rate is increased to 1C, the capacity is decreased and the voltage platform is increased in charge processing and decreased in discharge processing.
The results indica ted that as positive electrode materials LiMn_2O_4 containing suitable amount of p olypyrrole exhibited high voltage platform and high discharge capacity, and LiMn_2O_4/PPY composites exhibited high discharge capacity and low voltage platform.
The specific capacity of (battery) with LiCoO_2 increased from 128 mAh/g to 139 mAh/g by changing sintering technology. After cycled 100 times, the (decrease) of specific capacity was less than 15%, the decrease of voltage platform was less than 17%. The electrochemical (properties) of products were the same as the import goods.
The results showed that LiFePO_4 were simple pure olive-type phase, and exhibit a 3.4V discharge voltage plateau. LiFePO_4 as prepared possessed excellent electrochemical performance, whose first specific capacities were 142.3mAh/g at 0.2mA/cm 2,127 mAh/g at 0.4 mA/cm 2, after 20 times cycling, the specific capacities were 129.7mAh/g,105.5mAh/g respectively.
The results showed that sulfur electrodes based on the prepared electrolytes showed two voltage plateaus at around 2.3 V and 2.0 V,the voltage of lower voltage plateau was highly dependent on the viscosity of the electrolyte.
LiFePO_4/C showed a good charge-discharge voltage plateau at 3.4 V and higher capacity and better cyclability compared with LiFePO_4.The first specific discharge capacities were 133 mAh/g, and 93.8% of which retained after 20 times cycling at 60 ℃.
The electrode can get a 5 voltage flat by using 3d transition metal element to partly replacing the Mn of the spinel lithium manganese Oxide,and the advantage of the 5V battery is the high power density.
The test results showed that discharge capacities at 0.2C5、0.5C5、1C5 were all beyond 500mAh, and the discharge flats on 3.6V were respectively 92.2%、86.1%、75.8%. Cycle life was 300 times, the attenuation of capacity less than 10%.
(f) The average voltages for LiMn2O4, LiCoO2, LiNiO2 have been calculated by total energy change between non-intercalated and intercalated models. There are two steps with 3.205V and 4.002V during the lithium insertion of Mn4O8 Li2Mn4O8 Li4Mn4O8;
Its design permits to operate at 80 kV without a bulky high voltage platform, in order to produce multi-mA beams of protons and H2+.
One of the important features of this facility is the availability of relatively large currents of multiply charged positive ions from an electron cyclotron resonance (ECR) source placed entirely on a high voltage platform.
All the electronic and vacuum systems related to the ECR source including 10 GHz ultra high frequency (UHF) transmitter, high voltage power supplies for extractor and Einzel lens are placed on a high voltage platform.
In order to achieve sufficiently high energy for transmission through the foils, the experimental setup is mounted on a high voltage platform.
The high voltage platform, accelerating system and the beam lines are designed and developed indigenously.
The EDLC cell with the polymer hydrogel electrolyte showed lower voltage decay on open circuit than that with a KOH aqueous solution.
Open-circuit voltage decay (OCVD) of many monocrystalline silicon solar cells after IR optical and electrical excitation (PIVD) has been measured.
More realistic circuit model evaluations of the stored charge of minority carriers yield a second time constant besides minority carrier lifetime, apparent in the voltage decay and excitation dependent.
The features of both distributions are determined by breaks in the voltage gradient (the slope of monotonic voltage decay) at the sites of local non-uniformity of the dendritic geometry, such as abrupt change in diameter and asymmetric branching.
At normal pH (8.2), the voltage decay following a charge-pulse of 500 ns duration fed to the vacuole could be described by summing two exponential relaxations.
A review with 16 references was given on the methods to decrease the internal resistance to improve the discharge voltage platform from several aspects such as hydrogen storage materials, manufacturing of the nagetive electrode and positive electrode,composition of electrolyte.
According to the research results of internal and external spherical nickel hydroxides,it was shown that they were different in such respects as chemical composition,crystal structure and Crystallite size etc. The external nickel hydroxides represented by Japan were excellent in the electrochemical performances such as longer discharge voltage platform and longer charge-discharge cycle life under high current because of their branch-crystalline-form and smaller crystallite size. On the other hand,the internal...
According to the research results of internal and external spherical nickel hydroxides,it was shown that they were different in such respects as chemical composition,crystal structure and Crystallite size etc. The external nickel hydroxides represented by Japan were excellent in the electrochemical performances such as longer discharge voltage platform and longer charge-discharge cycle life under high current because of their branch-crystalline-form and smaller crystallite size. On the other hand,the internal nickel hydroxides were inferior to the external ones in electrochemical performances because of their grain-crystalline-form and bigger crystallite size.