Thermal, structural and electrical properties of Li-Mn-B-O glass on crystallization

• Published in: Journal of the Korean Physical Society Vol. 63; no. 12; pp. 2371 - 2375
• Main Authors: Kang, Jong Hyun, Yang, Yong Suk, Choi, Hyun Woo
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Netherlands 01.12.2013; 한국물리학회
• Subjects: Mathematical and Computational Physics; Particle and Nuclear Physics; Physics; Physics and Astronomy; Theoretical; 물리학; Li-Mn-B-O glass; Li battery cathode; Impedance; Nanocrystal; Crystallization
• ISSN: 0374-4884; 1976-8524
• DOI: 10.3938/jkps.63.2371

We have fabricated Li-Mn-B-O (Li:Mn:B = 2:1:2 mole ratio, LMBO) glass using the meltquenching method for the development of a cathode material for use in lithium ion batteries. Differential scanning calorimetry, X-ray diffraction and an impedance gain phase analysis have been used to investigate thermal, structural and electrical properties, respectively. We have found that four consecutive crystallizations of the LMBO glass occur with heating and that the series of crystal phases corresponds to Li 2 MnO 3 , Mn 3 O 4 , unknown and Li 2 B 4 O 7 . The resistivity of the LMBO compound decreases with increasing heat treatment temperature, and the dc conductivities of the heat-treated samples are within the range of ∼10 −6 to 10 −7 S/cm, which are values similar to those of the most-frequently used Li-Co(Mn,Fe)-O(PO 4 ) bulk polycrystal compounds. During crystallization of the LMBO glass, Li 2 MnO 3 , Mn 3 O 4 and Li 2 B 4 O 7 nanocrystals with average grain sizes of less than 55 nm are formed.