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Effects of Nano Carbon Conductive Additives on the Electrochemical Performance of LiCoO2 Cathode for Lithium Ion Batteries

Effects of Nano Carbon Conductive Additives on the Electrochemical Performance of LiCoO₂ Cathode for Lithium Ion Batteries

School of Materials Science and Engineering, Chongqing University, Chongqing, 400030, P. R. China

Corresponding Author Email:

lixinlu@cqu.edu.cn

Received:

21 March 2015

| |

Accepted:

21 April 2015

| | Citation

358-article_131-135.pdf

OPEN ACCESS

Abstract:

Carbon black(CB), multi-walled carbon nanotubes(CNTs) and graphene nanosheets(GNs) were employed as carbon conductive additives for LiCoO₂(LCO). X-ray diffraction, transmission electron microscopy and scanning electron microscopy were used to characterize the crystal structure and morphology of samples. And the specific surface area and porosity structure of the three kinds of carbon conductive additives were measured by N₂ adsorption-desorption. To investigate the effect on the electrochemical reaction activity, galvanostatic discharge-charge experiments showed that the composite of LCO-GNs exhibited the highest specific capacity of 167mAh/g at 0.1C and 123 mAh/g at 1 C rate. The flexible wrapping of GNs and bridging nearby LCO particles together were found to enhance electrical conductivity most effectively.

Keywords:

LiCoO₂, Carbon conductive additives, Graphene nanosheets, Lithium-ion batteries

1. Introduction

2. Experimental

3. Results and Discussion

4. Conclusions

Acknowledgements

The authors are grateful for the financial support from the Project No. CDJZR13130027 of the Fundamental Research Funds for the Central Universities and National Natural Science Foundation of China (No.51172293) and the technical support from the Laboratory of Advanced Carbon Functional Nanomaterials (Chongqing University, China).

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Effects of Nano Carbon Conductive Additives on the Electrochemical Performance of LiCoO2 Cathode for Lithium Ion Batteries