Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7731372 | Journal of Power Sources | 2015 | 8 Pages |
Abstract
High-capacity Li2MnSiO4/C (LMS/C MBS) nanoparticles have been prepared using sonochemistry under a multibubble sonoluminescence (MBS) condition, and their physical and electrochemical properties were characterized. The results show that LMS/C MBS nanoparticles exhibit a nearly pure crystalline phase with orthorhombic structure and have a spherical shape and a uniform particle size distribution centered at a diameter of 22.5 nm. Galvanostatic charge-discharge measurements reveal that LMS/C MBS delivers an initial discharge capacity of about 260 mA h gâ1 at a current rate of 16.5 mA gâ1 in the voltage range of 1.5-4.8 V (vs. Li/Li+), while LMS MBS (LMS without a carbon source under MBS) and LMS/C SG (LMS with a carbon source using the conventional sol-gel method) possess lower capacities of 168 and 9 mA h gâ1, respectively. The improved electrochemical performance of LMS/C MBS can be ascribed to the uniform nanoparticle size, mesoporous structure, and in-situ carbon coating, which can enhance the electronic conductivity as well as the lithium ion diffusion coefficient.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Chahwan Hwang, Taejin Kim, Joongpyo Shim, Kyungwon Kwak, Kang Min Ok, Kyung-Koo Lee,