Electrochemical performances discharged to lower potential for LiNi0.5Mn1.5O4 cathode material synthesized by PAA-assisted co-precipitation method

DOI

10.2991/icimm-15.2015.94How to use a DOI?

Keywords

Lithium battery cathode material; LiNi0.5Mn1.5O4; Polyacrylic acid; Co-precipitation

Abstract

The cathode material LiNi0.5Mn1.5O4 with cubic spinel structure was prepared by co-precipitation process using LiCl, NiCl2•6H2O and MnCl2•4H2O as raw materials, oxalate as a precipitant, polyacrylic acid(PAA) as a dispersant agent. The synthesized materials were analyzed and characterized by X-ray diffraction(XRD), scanning electron microscopy(SEM). It was found that all of the samples had cubic spinel structure without undesired impurities. According to the SEM, the powder had uniform particle size and its aggregations was reduced because of the assistance of polyacrylic acid. Moreover, on the basis of the electrochemical performances tests, it could be found that the initial discharge capacity discharged to lower potential for the samples with PAA addition were higher than the theoretical capacity of the spinel LiNi0.5Mn1.5O4. All the samples synthesized by PAA-assisted method possess good capacity retention and rate performance, compared to the sample without PAA addition. The discharge capacity for 3wt% sample was significantly enhanced about 87.5% at 1C, 39.4% at 2C and 43.5% at 5C with respect to the sample without PAA. The great enhancement could be attributed to an effectively shortened Li-ion diffusion path way.

Copyright

© 2015, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Zhen Wang
AU  - Weiquan Shao
AU  - Shaou Chen
AU  - Lizhu He
AU  - Hongliang Li
AU  - Yueqin Ban
AU  - Xiaojie Guo
AU  - Haifeng Zhao
AU  - Yingnan Zhang
PY  - 2015/07
DA  - 2015/07
TI  - Electrochemical performances discharged to lower potential for LiNi0.5Mn1.5O4 cathode material synthesized by PAA-assisted co-precipitation method
BT  - Proceedings of the 5th International Conference on Information Engineering for Mechanics and Materials
PB  - Atlantis Press
SP  - 502
EP  - 506
SN  - 2352-5401
UR  - https://doi.org/10.2991/icimm-15.2015.94
DO  - 10.2991/icimm-15.2015.94
ID  - Wang2015/07
ER  -