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Graphite/Li2ZrO3 anode for a LiFePO4 battery

Viona Natalia, Fitria Rahmawati, Arinta Wulandari, and Agus Purwanto

Sebelas Maret University, Surakarta, Indonesia

 

E-mail: fitria@mipa.uns.ac.id

Abstract: Lithium zirconate, Li2ZrO3 (LZO), was added to graphite anode at various compositions of 0%, 20%, and 30% of weight, and used in a LiFePO4 (LFP) battery fabrication. The battery cells were designated as LFP//G, LFP//20LZOG, and LFP//30LZOG, respectively. Herein, battery performance was tested to understand LZO contribution to the LFP cathode at different current rates. The data taken were specific capacity of battery, anodic current density, and a crystallite volume change after 50 cycles of charge–discharge. The result found that addition of 20% weight LZO to graphite increases discharge specific capacity after 50 cycles from 71.87 to 72.53 mAhg−1 with Coulombic efficiency of 99.73%. The capacity retention is 62.1%, which is higher than LFP//G, i.e., 57.7%. The anodic current density of LFP//20LZOG is 9.09 × 10−6 Acm−2, also higher than the current density of LFP//G, i.e., 8.91 × 10−8 Acm−2. It indicates contribution of LZO to increase electrochemical reaction rate during battery usage. Structural investigation shows that the LZO addition decreases the volume change of anode material after 50 cycles of charge–discharge under 1C current rate. It indicates that Li2ZrO3 has good structural stability.

Keywords: Electrochemical property ; LiFePO4 battery ; Lithium ion battery (LIB) ; Li2ZrO3 ; Specific capacity 

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-018-0626-0

 

Chemical Papers 73 (3) 757–766 (2019)

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