期刊
ELECTROCHIMICA ACTA
卷 95, 期 -, 页码 295-300出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2013.01.102
关键词
Li-ion batteries; Positive electrode; Electrophoretic deposition; Box-Bhenken design
资金
- IT R&D program of MKE (Ministry of Knowledge Economy)/KEIT (Korea Evaluation Institute of Industrial Technology) [10041856]
A direct deposition technique based on electrophoresis is employed to prepare positive electrode for Li-ion batteries. Li[Ni1/3Co1/3Mn1/3]O-2 (active material), denka black (conductive agent) and PVDF (binder) is dispersed in the solvent and used as a suspension for electrophoretic deposition (EPD) process. The Box-Bhenken design is made to optimize the EPD suspension, by varying three controllable input factors namely weight of active material, conductive agent and binder. The output responses are initial discharge capacity and capacity retention ratio. There is a good agreement between the actual and predicted values. The adequacies of the models are established with analysis of variance. The response surface methodology with desirability function is used to determine the optimum deposition condition to obtain maximum initial discharge capacity and capacity retention ratio for the EPD prepared positive electrode. The developed design predicts the 500 mg of active material, 10 mg of conductive agent and 30 mg of binder as an optimum condition for maximum discharge capacity of 152 mAh/g and capacity retention ratio of 93%. For confirmation, the electrode prepared with these optimum parameters gives discharge capacity of 147.18 mAh/g and capacity retention ratio of 97.11%. EPD process is suggested to be efficient for fabrication of positive electrode under the predicted optimal condition in accordance to the positive electrode prepared by Doctor blade method. (c) 2013 Elsevier Ltd. All rights reserved.
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