کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1288081 | 1645393 | 2013 | 8 صفحه PDF | دانلود رایگان |
A systematic comparison of LMP prepared by solid-state reaction (SSR) and polyol methods was carried out through detailed analyses that included: X-ray and neutron powder diffractions, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and electrochemical characterization. The LMP synthesized by the two different methods had a similar amount of Li/Mn cation mixing, ca. 4–5%. The polyol method provided a flower-like morphology to the LMP particles, in the form of platelet of which growth direction is parallel to the bc-plane. The LMP prepared by the polyol method was further optimized by carbon composite using two different kinds of carbon sources: Shawinigan acetylene black (AB) and Super-P Li carbon black (SP). With the smallest crystallite size and a homogeneous carbon particle network, the LMP processed with SP delivered better cathode performance than both the AB – mixed LMP and that prepared by the SSR method. AC-impedance spectroscopy of the LMP composite with SP showed an abrupt increase in impedance after 50% delithiation. Because of this difficulty of charging, the capacity of the LMP composite with SP was strongly influenced by the upper cut-off voltage used.
► Effect of synthetic methods on LMP was investigated.
► LMP had 4–5% cation mixing from powder neutron diffraction data.
► TEM analysis showed that polyol method grows LMP platelets parallel to bc-plane.
► Polyol method with super-P composite offered the best performances.
► Capacity of LMP was strongly influenced by upper cut-off voltage used.
Journal: Journal of Power Sources - Volume 230, 15 May 2013, Pages 122–129