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小木虫论坛-学术科研互动平台 » 化学化工区 » 电化学 » 电化资源 » JMCA 上面的一篇聚苯胺包覆富锂的文章
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coolyuruizhi

金虫 (小有名气)

[交流] JMCA 上面的一篇聚苯胺包覆富锂的文章 已有6人参与

In situ polyaniline modified cathode material Li[Li0.2Mn0.54Ni0.13Co0.13]O2 with high rate capacity for lithium ion batteries
Lithium-rich layered Li[Li0.2Mn0.54Ni0.13Co0.13]O2 is prepared by a fast co-precipitation method and surface
modified with conducting polyaniline (PANI, 5 wt%, 10 wt%, 15 wt%, 20 wt%, 30 wt% theoretically) via in situ
chemical oxidation polymerization to optimize the electrochemical properties. The uniform PANI layer with
a thickness of 5 nm (10 wt%) has been successfully coated on the surface of Li[Li0.2Mn0.54Ni0.13Co0.13]O2
particles, as observed by field-emission scanning electron microscopy (FESEM) and high resolution
transmission electron microscopy (HRTEM). The X-ray powder diffraction (XRD) results show that all the
prepared samples have a typical layered hexagonal a-NaFeO2 structure. The PANI layer maintains the
integrity of the surface material crystal structure of the Li[Li0.2Mn0.54Ni0.13Co0.13]O2 particles by
protecting the electrodes from external erosion during continuous charge–discharge cycles. PANIcoated Li[Li0.2Mn0.54Ni0.13Co0.13]O2 electrodes present excellent electrochemical properties at room
temperature. The initial discharge capacity is 313.5 mA h g 1 (0.05 C) with a coulombic efficiency of
89.01% (PANI, 10 wt%), compared with 291.9 mA h g 1 (0.05 C) for the pristine Li[Li0.2Mn0.54Ni0.13Co0.13]-
O2 with a coulombic efficiency of 81.31% in the potential range 2.0–4.8 V (vs. Li/Li+). The discharge
capacity is retained at 282.1 mA h g 1 after 80 cycles at 0.1 C. Moreover, the PANI-coated Li
[Li0.2Mn0.54Ni0.13Co0.13]O2 exhibits an excellent high rate capacity of 198.6 mA h g 1 at 10 C. The
electrochemical impedance spectra (EIS) measurements reveal that the thin PANI coating layer
significantly optimizes the interfacial electrochemical reaction activity by reducing the charge transfer
resistance. Moreover, the special H +/Li+ exchange reaction during the proton acid doping procedure
also promotes the improvement of the electrochemical performance
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1楼 2014-11-05 20:27:19
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明月苔

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xuxijun2012

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2楼2014-11-05 21:10:15
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jiden

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chen118

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