| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 189129 | Electrochimica Acta | 2012 | 6 Pages |
Carbon-coated layered oxide Li1.048Mn0.381Ni0.286Co0.286O2 is prepared by combining a co-precipitation and a direct current magnetron sputtering. TEM images show that the carbon layer is relatively well coated on the surface of oxide particles. The Li1.048Mn0.381Ni0.286Co0.286O2/C composite delivers an initial discharge capacity of 203.2 mAh g−1 between 2.5 and 4.5 V at 0.1 C, and 94% of the initial discharge capacity can be retained after 100 cycles. Moreover, the carbon-coated oxide exhibits noticeable high-rate capacity of 145 mAh g−1 at 5 C, much higher than the pristine one (103 mAh g−1 at 5 C). The improved discharge capacity and cycle performance are attributed to the carbon coating, which protects the Li-rich cathode material from reacting with the electrolyte and retarding the incrassation of SEI film on the surface of oxide particles.
► Carbon is coated on Li1.048Mn0.381Ni0.286Co0.286O2 by a direct current magnetron sputtering. ► Cycle capability and rate performance are improved after carbon coating. ► A specific capacity of 145 mAh g−1 can be obtained at 5 C (1500 mA g−1). ► The coated layer restrains the reaction between the electrolyte and the electrode.
