E3S Web Conf.
Volume 213, 20202nd International Conference on Applied Chemistry and Industrial Catalysis (ACIC 2020)
|Number of page(s)||9|
|Section||Industrial Catalysis and Chemical Substance R&D and Application|
|Published online||01 December 2020|
Preparation of spherical LiNi0.5Mn1.5O4 with core-multilayer shells structure by co-precipitation method and long cycle performance
Heilongjiang Institute of Science and Technology, College of Environment and Chemical Engineering, NO. 2468 Puyuan Road, Harbin, 150022 China.
2 Sinopec Shengli Petroleum Engineering Co., Ltd, No. 125, Jinan Road, Dongying, 257002 China.
3 Heilongjiang Institute of Energy and Environment, No. 15, Songshan Road, Harbin, 150000 China.
* Corresponding author: email@example.com
As a promising cathode material for lithium ion battemensionalry of high voltage, spinel LiNi0.5Mn1.5O4 has attracted interest due to its high discharging voltage at 4.7 V and high energy density of 610 Wh kg-1. In this work, LiNi0.5Mn1.5O4 with a new core-multilayer shells structure (LNMO-900) is synthesized successfully by co-precipitation method and shows a better electrochemical performance. The formation of the core-multilayer shells structure is related to the kirkendall effect, the shell maintains structural stability, and improves long cycle performance. Core-multilayer shells structure is also beneficial for transmission of lithium ion, increasing rate performance. The effects of sintering temperature on the performance of LNMO were further investigated. Core-multilayer shells LiNi0.5Mn1.5O4 is synthesized successfully at 900 °C for 12 h uniquely. From the integral calculation of XPS spectra, a higher content of Mn4+ is observed in the outer shell of LNMO-900 compared with other homogeneous solid particles. The discharge specific capacity of LNMO-900 is 129.3 mAh g-1 at 1 C which is superior to others, and after 1000 cycles, LNMO-900 shows capacity retention of 87.9%. The initial capacity of LNMO-900 is 104.9 mAh g-1 at 5 C.
© The Authors, published by EDP Sciences, 2020
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