| 학회 | 한국공업화학회 |
| 학술대회 | 2010년 봄 (05/13 ~ 05/14, BEXCO(부산)) |
| 권호 | 14권 1호 |
| 발표분야 | Energy Storage and Conversion |
| 제목 | Carbon coated nanostructure lithium titanate as a high rate electrode material for lithiumion batteries |
| 초록 | LIBs with lithium titanate materials show high power density, safety, and long cycle life since the lithium titanate is a “zero strain” material in terms of lithium intercalation and relative high intercalated potential. Herein, we prepared the carboncoated Li4Ti5O12 by a solidstate reaction process in combination with a thermal vapor deposition (TVD) technology. The electrochemical profile for lithium intercalation was studied. Figure 1 gives the TEM and SEM images of carboncoated Li4Ti5O12 with different morphologies. Being different from the conventional solidstate reaction process, the well wrapped carbon layer on the surface of the TiO2 precursors could efficiently prevent from its aggregation during the sintering, the morphology of starting precursor can be successfully preserved. Moreover, as TEM image shown in the inset with a high magnification, a uniform carbon layer connecting tightly on the LTO particle was coated. As a result, the carbon coated nanostructure Li4Ti5O12 has a high electronic conductivity and good rate capability. Figure 2 compares the rate capability of the LTO/C and LTO in a cell with a metallic lithium negative electrode at different current rates. The discharge current rates vary from 0.2C to 3 C. The LTO/C sample exhibits excellent rate capability, which is similar to the commercial 200 nm nanosized LTO (typically for supercapacitor application), but is much better than that of conventional LTO microsphere. A cylindrical 26650 battery using different types of LTO was also studied. |
| 저자 | Yongyao Xia |
| 소속 | Fudan Univ. |
| 키워드 | carbon coating; lithium titanate; high rate; lithium-ion batteries |
