| CHEN Chang,CAO Feng-hong,DENG Chi,XU Yao-hui,LIU Chun-hai,ZHANG Wei.Preparation and Electrochemical Properties of LiFePO4/C Multilayer[J],48(2):76-81 |
| Preparation and Electrochemical Properties of LiFePO4/C Multilayer |
| Received:July 19, 2018 Revised:February 20, 2019 |
| View Full Text View/Add Comment Download reader |
| DOI：10.16490/j.cnki.issn.1001-3660.2019.02.011 |
| KeyWord:multi-target magnetron sputtering 304 stainless steel LiFePO4/C multilayer modulation period graphitization degree electrochemical property |
| Author | Institution |
| CHEN Chang |
1.School of Physics and Electronic Engineering, Leshan Normal University, Leshan , China |
| CAO Feng-hong |
1.School of Physics and Electronic Engineering, Leshan Normal University, Leshan , China |
| DENG Chi |
1.School of Physics and Electronic Engineering, Leshan Normal University, Leshan , China |
| XU Yao-hui |
1.School of Physics and Electronic Engineering, Leshan Normal University, Leshan , China |
| LIU Chun-hai |
2.School of Materials and Chemical Engineering, Chengdu University of Technology, Chengdu , China |
| ZHANG Wei |
3.Analysis and Test Center, Sichuan University of Science and Engineering, Zigong , China; 4.Key Laboratory for Material Corrosion and Protection of Sichuan Province, Zigong , China |
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| Abstract: |
| The work aims to study the electrochemical properties of LiFePO4/C multilayer films in different modulation pe-riods. 10 nm Ti film was deposited on 304 stainless steel as the barrier layer by multi-target magnetron sputtering and then the LiFePO4/C films were deposited alternately to prepare three [LiFePO4/C]n multilayer films with different modulation periods. The cross-sectional morphology and composition of [LiFePO4/C]n multilayer films with different modulation periods before and after annealing at 500 ℃ for 2 h were characterized by SEM and EDS. The structure of LiFePO4 film and [LiFePO4/C]n multilayer films with different modulation periods before and after annealing at 500 ℃ for 2 h was characterized by XRD. The C structure of [LiFePO4/C]n multilayer films with different modulation periods after annealing at 500 ℃ for 2 h was characterized by Raman. The electrochemical property of LiFePO4 film and [LiFePO4/C]n multilayer films with different modulation periods was evaluated by cyclic voltammetry and galvanostatic charge-discharge tests. The degree of graphitization in [LiFePO4 (160 nm)/C(16 nm)]7.5 (the modulation cycle of 7.5 times) multilayer was higher than that in [LiFePO4 (80 nm)/C(8 nm)]15 (the modulation cycle of 15 times) and [LiFePO4 (240 nm)/C(24 nm)]5 (the modulation cycle of 5 times) multilayers. The [LiFePO4 (160 nm)/C(16 nm)]7.5 multilayer had better charge-discharge capacity and rate performance than the [LiFePO4 (80 nm)/C(8 nm)]15 and [LiFePO4 (240 nm)/ C(24 nm)]5 multilayers. The specific capacity of [LiFePO4 (160 nm)/C(16 nm)]7.5 was 151 mAh/g at 0.1 C, and the specific capacity was 30 mAh/g at 5 C. LiFePO4/C multilayer has good electrochemical properties under the appropriate modulation period. |
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