Energy Storage Science and Technology ›› 2016, Vol. 5 ›› Issue (4): 478-485.doi: 10.12028/j.issn.2095-4239.2016.00.010

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Electrochemical thermal stability of the LiFePO4/LiNi0.8Co0.15Al0.05O2 blend cathode material for lithium ion batteries

ZHU Lei, JIA Di, YU Chao, WU Yongmin, WU Xiaomeng, TANG Weiping   

  1. Shanghai Institute of Space Power Sources , Shanghai 200245, China
  • Received:2015-12-31 Revised:2016-01-24 Online:2016-07-01 Published:2016-07-01

Abstract:

The LiFePO4/LiNi0.8Co0.15Al0.05O2 blend cathode material for lithium ion batteries was prepared by ball-milling to improve the electrochemical thermal stability of LiNi0.8Co0.15Al0.05O2. The crystalline structure, morphology and electrochemical performance were characterized by X-ray diffraction, scanning electron microscopy and electrochemical tests. The results showed that LiNi0.8Co0.15Al0.05O2 was coated by the LiFePO4 nanoparticals.  LiFePO4/LiNi0.8Co0.15Al0.05O2 blend cathode material exhibited an excellent electrochemical thermal stability with 82.0% capacity retention after 100 cycles at 50oC, which was is much better than 72.9% of the pristine LiNi0.8Co0.15Al0.05O2.

Key words: LiNi0.8Co0.15Al0.05O2, LiFePO4, blend cathode material, lithium ion battery, thermal stability