Li3V2(PO4)3 modified LiFePO4/C cathode materials with improved high-rate and low-temperature properties

F-doped LiFePO4/C cathode materials were synthesized by two-step solid-state reaction route. The F-doped LiFePO4/C increases the intrinsic conductivity, the diffusion of lithium ions, also improves the high-rate and low-temperature performances of LiFePO4. The SEM images reveal some small morphology changes of the two kinds of the materials, so the improved properties may not due to grain size changes but crystal structure changes. The F-doped material has a higher capability at low temperature. At -20°C, with the rate of 0.5C, the discharge capacity was 82mAhg-1, higher than that of undoped material(65mAhg-1) and the result is better than the previous study[17](65mAhg-1 at the rate of 0.3C), and the disparity would enlarge with the rate increased. The CV plots indicate that the doped material reveals less degree of polarization. F-doping sample improves the electrical conductivity of material, accelerating the process of Li+ deintercalation, therefore, improving the electrochemical performances at low temperature.

Download Full-text

LiMgxMn2−xO4 (x≤0.10) cathode materials with high rate performance prepared by molten-salt combustion at low temperature

Ceramics International ◽

10.1016/j.ceramint.2015.04.032 ◽

2015 ◽

Vol 41 (8) ◽

pp. 9662-9667 ◽

Cited By ~ 21

Author(s):

Jijun Huang ◽

Fangli Yang ◽

Yujiao Guo ◽

Cancan Peng ◽

Hongli Bai ◽

...

Keyword(s):

Low Temperature ◽

Molten Salt ◽

Cathode Materials ◽

High Rate ◽

Rate Performance ◽

High Rate Performance

Download Full-text

Enhanced High-Rate and Low-Temperature Electrochemical Properties of LiFePO4/Polypyrrole Cathode Materials for Lithium-ion Batteries

International Journal of Electrochemical Science ◽

10.20964/2019.04.01 ◽

2019 ◽

pp. 3408-3417 ◽

Cited By ~ 2

Author(s):

Yuan Gao ◽

Keyword(s):

Low Temperature ◽

Electrochemical Properties ◽

Lithium Ion Batteries ◽

Cathode Materials ◽

Lithium Ion ◽

High Rate

Download Full-text

Rapid Freezing of Freeze-Etch Specimens

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s1431927600003275 ◽

1980 ◽

Vol 38 ◽

pp. 752-755

Author(s):

A. Elgsaeter ◽

T. Espevik ◽

G. Kopstad

Keyword(s):

Low Temperature ◽

Metal Surface ◽

Relative Velocity ◽

Thermal Contact ◽

High Rate ◽

Rapid Freezing ◽

Temperature Decrease ◽

Freeze Etching

The importance of a high rate of temperature decrease (“rapid freezing”) when freezing specimens for freeze-etching has long been recognized1. The two basic methods for achieving rapid freezing are: 1) dropping the specimen onto a metal surface at low temperature, 2) bringing the specimen instantaneously into thermal contact with a liquid at low temperature and subsequently maintaining a high relative velocity between the liquid and the specimen. Over the last couple of years the first method has received strong renewed interest, particularily as the result of a series of important studies by Heuser and coworkers 2,3. In this paper we will compare these two freezing methods theoretically and experimentally.

Download Full-text