Ultrasonic-assisted co-precipitation to synthesize lithium-rich cathode Li1.3Ni0.21Mn0.64O2+d Materials for lithium-ion batteries

JOURNAL OF POWER SOURCES

卷:272

Article

Li, Li¹  Song, Shaotang¹  Zhang, Xiaoxiao¹  Chen, Renjie¹  Lu, Jun²  Wu, Feng¹  Amine, Khalil^2,3 

[1] Beijing Inst Technol, Bejing Key Lab Environm Sci & Engn, Sch Chem Engn & Environm, Beijing 100081, Peoples R China

[2] Argonne Natl Lab, Chem Sci & Engn Div, Argonne, IL 60439 USA

[3] King Abdulaziz Univ, Fac Sci, Dept Chem, Jeddah, Saudi Arabia

关键词: Lithium-ion battery;    Cathode material;    Ultrasonic-assisted co-precipitation;    Rate capability;   

DOI  :  10.1016/j.jpowsour.2014.08.063

来源: Elsevier

【 摘 要 】

Lithium-rich, composite-layered, transition metal oxides have been intensively investigated recently. However, poor rate capability has severely hindered the commercial development of these materials. We produce nanoscale hydroxide precursors for these cathodes using ultrasonic-assisted co-precipitation. The ultrasonic irradiation of a liquid leads to the generation of a cavitation phenomenon comprised of unique reaction fields, which assists in the synthesis of nanoparticle materials. This is confirmed by scanning and transmission electron microscopy. X-ray diffraction and Rietveld refinement results indicate that the ultrasonic-assisted Li1.3Ni0.21Mn0.64O2+d material has a larger lithium slab space. Electrochemical studies indicate that the ultrasonic-assisted material exhibits a higher initial discharge capacity (251.2 mAh g(-1) at 0.1 C) and better cycling performance (200.4 mAh g(-1) after 50 cycles) compared with the material synthesized using traditional co-precipitation. Surprisingly, the ultrasonic-assisted material has a stable capacity of 140 mAh g(-1) at 5 C and 115 mAh g(-1) at 10 C after 50 cycles. First-principles calculations are used to confirm that the specific lattice structure leads to a faster lithium-ion mobility speed. (C) 2014 Elsevier B.V. All rights reserved.

【 授权许可】

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