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Electrochemical Performance of SnPO4-coated LiNi1/3Mn1/3Co1/3O2 Cathode Materials

Electrochemical Performance of SnPO₄-coated LiNi_1/3Mn_1/3Co_1/3O₂ Cathode Materials

Hyun-Soo Kim^*
| Woo-Seong Kim
| Hal-Bon Gu
| Guoxiu Wang

Battery Research Center, Korea Electrotechnology Research Institute, Changwon 641-120, Korea

Daejung EM Co., Incheon 405-820, Korea

Dept. of Electrical Eng., Chonnam National University, Gwangju 500-757, Korea

School of Mechanical, Materials and Mechatronic Engineering, University of Wollongong, NSW 2522, Australia

Corresponding Author Email:

hskim@keri.re.kr

Received:

September 15, 2009

| |

Accepted:

September 25, 2009

| | Citation

448-article_text-768-1-10-20170802.pdf

OPEN ACCESS

Abstract:

A Sn phosphate was successfully coated to the surface of LiNi_1/3Co_1/3Mn_1/3O₂ particles using a new method we developed. The elements Sn and P were observed to be uniformly distributed on the surface of the LiNi_1/3Co_1/3Mn_1/3O₂. After the Sn phosphate coating, the onset temperature shifted up to about 250 oC, and the exothermic value also decreased to 116.3 J/g, i.e. the thermal stability of the material was enhanced.

The rate capability of the 1 wt% Sn phosphate-coated LiNi_1/3Co_1/3Mn_1/3O₂ materials was enhanced at room temperature and 60 oC. However, a 3 wt% Sn phosphate coating degraded the electrochemical performance. The 1 wt% Sn phosphate-coated material showed improved cycle performance compared to that of the bare material at room temperature and 60 oC. It is believed that the oxide coating layer prevented direct contact with the organic electrolyte.

Keywords:

SnPO₄, LiNi_1/3Mn_1/3Co_1/3O, thermal stability, rate capability, cycle performance

1. Introduction

2. Experimiental

3. Results and Discussion

4. Conclusions

5. Acknowledgments

This research was supported by a grant (code number: 08K1501- 01510) from the Center for Nanostructured Materials Technology under the 21st Century Frontier R&D Programs of the Ministry of Education, Science and Technology, Korea.

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Electrochemical Performance of SnPO4-coated LiNi1/3Mn1/3Co1/3O2 Cathode Materials