کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
180121 | 459371 | 2011 | 4 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Surface-segregated, high-voltage spinel LiMn1.5Ni0.42Ga0.08O4 cathodes with superior high-temperature cyclability for lithium-ion batteries Surface-segregated, high-voltage spinel LiMn1.5Ni0.42Ga0.08O4 cathodes with superior high-temperature cyclability for lithium-ion batteries](/preview/png/180121.png)
The substitution of a small amount of Ga in the high-voltage spinel cathode LiMn1.5Ni0.42Ga0.08O4 leads to superior cyclability at room temperature and 55 °C along with higher rate capability with conventional electrolytes compared to that found with the LiMn1.5Ni0.5O4 cathode. The superior performance is attributed to the segregation of the inert Ga3+ ions to the surface during the synthesis process, providing a robust, more stable interface with the electrolyte at the high operating voltage (~ 4.7 V), along with the stabilization of the spinel structure with a disordering of the cations in the octahedral sites.
► Surface and depth-profile characterization by time-of-flight secondary ion mass spectroscopy.
► Superior elevated-temperature cyclability and rate capability for 5 V spinel cathodes.
► Cost-effective, one-step surface decoration of high-voltage cathodes by dopant ions.
Journal: Electrochemistry Communications - Volume 13, Issue 11, November 2011, Pages 1213–1216