Decheng Li

Improved electrochemical properties of Li[Li0.2Ni0.17Mn0.56Co0.07]O2 cathode material via micro-structural rearrangement

To improve the rate capability of lithium-rich layered cathode material Li[Li0.2Ni0.17Mn0.56Co0.07]O2 a facile method aimed at micro-structural rearrangement was proposed. Through the combination of excess lithium and chemical activation post-treatment, the resulting material showed well ordered bulk and surface structures. The capacity retention for the modified material improved significantly (compared with untreated sample) at high discharge current densities. Moreover, the unique electrochemical behavior of the modified material reveals the existence of the chemically activated Li2MnO3 component within the composite.

Preparation, microstructure, and electrochemical properties of Sn-Co-C anode materials using composited carbon sources

Sn-Co-C alloy as a promising anode material was prepared via a facile carbothermal reduction method, using both graphite and sucrose as the composited carbon sources. The effect of the combination pattern of graphite and sucrose on the microstructure and electrochemical performances of the alloys was investigated using X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and galvanostatic cycling tests. Compared with the Sn-Co-C samples using only graphite or sucrose as the carbon sources, the sample using the composited carbon sources has a relative higher reversible capacity and better rate capability, which is probably related to the continuous and stable conductive network formed by graphite and amorphous carbon originated from the thermal decomposition of sucrose, as well as the small particle size and uniform distribution in the conductive network.

Influence of post-annealing in N2 on structure and electrochemical characteristics of LiNi0.5Mn1.5O4

LiNi0.5Mn1.5O4 prepared by a spray drying method was re-treated in N2 at 500, 600 and 700 °C, respectively. Their structural and electrochemical properties were studied by means of Fourier transform infrared(FTIR), X-ray diffraction(XRD), and charge-discharge tests. The space group of the LiNi0.5Mn1.5O4 transforms from P4332 to

Improved electrochemical properties of Li1.2Ni0.18Mn0.59Co0.03O2 by surface modification with LiCoPO4

Fd\bar 3m

Cathode material of secondary battery and preparation method thereof as well as anode and secondary battery

at an annealing temperature of 700 °C. The electrochemical characteristics of the treated samples are closely related to the annealing temperature. The sample treated in N2 at 500 °C shows both an improved rate capability and cyclic performance at a high temperature compared with the as-prepared sample, while the sample treated in N2 at 700 °C shows dramatically decrease in its reversible capacity.

Anode material for lithium battery and preparation method thereof, and lithium battery anode and lithium battery

ZnMn2O4 and Zn1−xAlxMn2O4 were synthesized by a spray drying process followed by an annealing treatment. Their structural and electrochemical characteristics were investigated by SEM, XRD, XPS, charge–discharge tests and EIS. XPS data indicate that the substitution of Al3+ for Zn2+ causes manganese to be in a mixed valence state by a charge compensation mechanism. Moreover, the presence of this charge compensation significantly improves the electrochemical performance of Zn1−xAlxMn2O4, such as increasing the initial coulombic efficiency, stabilizing the cycleability as well as improving the rate capability. The sample with 2% Al doping shows the best performance, with a first cycle coulombic efficiency of 69.6% and a reversible capacity of 597.7 mA h g−1 after 100 cycles. Even at the high current density of 1600 mA g−1, it still retained a capacity of 558 mA h g−1.