Details

Autor(en) / Beteiligte

• Zhu, Sheng-Wen
• Jing, Mao-Xiang
• Pi, Zhi-Chao
• Chen, Li-Li
• Shen, Xiang-Qian

Titel

Effects of Fibrous Nickel Additives on the Electrochemical Properties of LiFePO4 Cathode for Lithium-ion Battery

Ist Teil von

• International journal of electrochemical science, 2015-12, Vol.10 (12), p.10597-10606

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2015

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• In this paper, the effects of fibrous nickel(Ni) additives on the electrochemical performance of LiFePO4 as a lithium-ion battery cathode were investigated by a simple mixing process of LiFePO4 powders and porous nickel fibers. The microstructure and crystalline phase were characterized by scanning electron microscopy (SEM) and X-ray diffractometry (XRD). The electrochemical properties of nickel fiber/LiFePO4 composite were analyzed by the electrochemical impedance spectroscopy(EIS), cyclic voltammetry(CV), and galvanostatic charge/discharge test. Highly conductive Ni additive can enhance the electronic conductivity of LiFePO4. Electrode fabricated from nickel fiber/LiFePO4 composite as lithium-ion battery cathode exhibits better electrochemical performance compared with pristine LiFePO4. The electrode with optimal fiber content of 10wt% has the best redox kinetics and possesses a good rate capability of 85 mAh g-1 even at 5C, versus 60 mAh g-1 for pristine LiFePO4. It also shows good cyclability with initial discharge capacity of 131.1 mAh g-1 at 1C, and the retention capacity of 119.8 mAh g-1 after 100 cycles, whereas pristine LiFePO4 only delivers 108.2 mAh g-1 at the same condition and retention capacity of 100.9 mAh g-1 after 100 cycles.