Influence of Co increment on the electrochemical properties of Li 1.2 [Mn 0.52−0.5 x Ni 0.2−0.5 x Co 0.08+ x ]O 2 cathode materials for lithium-ion batteries

Autor: Chunlei Wang, Chao Yu, Wei-Ping Tang, Jizhou Kong, Zhou Tang, Jun-Xiu Li, Chong Ren, Fei Zhou
Rok vydání: 2015
Předmět:
Zdroj: Journal of Alloys and Compounds. 643:223-230
ISSN: 0925-8388
DOI: 10.1016/j.jallcom.2015.04.141
Popis: MCO 3 precursors are synthesized via co-precipitation method using NaCO 3 as the precipitation, and the environment friendly C 3 H 5 NaO 3 is acted as complexing agent to replace NH 3 ⋅H 2 O. And then the mixtures of MCO 3 precursors and LiOH⋅H 2 O are calcined at 950 °C to form Li 1.2 [Mn 0.52−0.5 x Ni 0.2−0.5 x Co 0.08+ x ]O 2 cathode materials with different Co increments. The influence of Co increment on the microstructure and electrochemical properties of Li 1.2 [Mn 0.52−0.5 x Ni 0.2−0.5 x Co 0.08+ x ]O 2 cathode materials has been analyzed. The results show that the c / a ratio for cathode material becomes higher, and then the layered structure becomes better when the Co increment increases. Among them, Li 1.2 [Mn 0.51 Ni 0.19 Co 0.1 ]O 2 ( x = 0.02) shows the best electrochemical properties with the initial discharge capacity of 261.0 mA h g −1 , capacity retention of 99.4% (189.9 mA h g −1 ) after 100 cycles at the charging and discharging current density of 100 mA g −1 and highest discharge capacity of 157.6 mA h g −1 at the discharging current density of 400 mA g −1 .
Databáze: OpenAIRE
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