Surface cleaning effect of NCM powder and improvement of lithium ion battery on the thermal stability and life cycle employing dielectric barrier discharge technique

• Published in: Current applied physics Vol. 18; no. 9; pp. 961 - 967
• Main Authors: Jeong, Hyun Young, Jung, Yong Ho, Chan Seok, Dong, Yoo, Seungryul, Kwon, Sung Ku, Han, Duksun
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.09.2018; 한국물리학회
• Subjects: Cathode material; Dielectric barrier discharge; Lithium ion battery; 물리학; Dielectric barrier discharge; Cathode material; Lithium ion battery
• ISSN: 1567-1739; 1878-1675; 1567-1739
• DOI: 10.1016/j.cap.2018.05.015

Mixed NCM (nikel, cobalt, and manganese) powder was treated by a reactive gas from dielectric barrier discharge (DBD) to prepare a cathode material in Lithium ion (Li-ion) battery. The DBD was mainly sustained using N2 gas at atmospheric pressure, and NF3, SF6, and H2 was fed into the discharge to create the reactive gas. Compare to the non-treated sample, impurities on the surface of the NCM powder were significantly removed in a 5 min when the reactive gas was blow into the powder and mixed properly. F atom content on the surface was increased depending on the time duration of mixing, which form a LiF layer on the surface. Desirable LiF layer suppress a heat flow effectively , resulting a decreasing of exothermic temperature inside the Li-ion battery. Additionally, the treatment of NCM powder employing DBD technique was also contributed to electrochemical performance, which was confirmed by c-rate testing. •NF3, SF6, H2 gases flowed into N2 based DBD, generating a reactive gas to remove impurities on a surface of NCM powder.•Li-ion batteries employing modified NCM powder suppressed over heating inside battery.•Electrochemical performance was also improved when the NCM powder was treated by the reactive gas from the DBD source.