Bulletin of the Korean Chemical Society

  • 제29권9호
  • /
  • Pages.1737-1741
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  • 2008
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  • 0253-2964(pISSN)
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  • 1229-5949(eISSN)
대한화학회 (Korean Chemical Society)
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Electrochemical Properties of LiNi0.8Co0.16Al0.04O2 and Surface Modification with Co3(PO4)2 as Cathode Materials for Lithium Battery

  • Ryu, Kwang-Sun (Department of Chemistry, University of Ulsan) ;
  • Lee, Sang-Hyo (Department of Metallurgical Engineering, Hanbat National University) ;
  • Park, Yong-Joon (Division of Advanced Industrial Engineering, Kyonggi University)
  • 발행 : 2008.09.30
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초록

The electrochemical and thermal stability of $LiNi_{0.8}Co_{0.16}Al_{0.04}O_2$ were studied before and after $Co_3(PO_4)_2$ coating. Different to conventional coating material such as $ZrO_2$ or AlPO4, the coating layer was not detected clearly by TEM analysis, indicating that the $Co_3(PO_4)_2$ nanoparticles effectively reacted with surface impurities such as $Li_2CO_3$. The coated sample showed similar capacity at a low C rate condition. However, the rate capability was significantly improved by the coating effect. It is associated with a decrease of impedance after coating because impedance can act as a major barrier for overall cell performances in high C rate cycling. In the DSC profile of the charged sample, exothermic peaks were shifted to high temperatures and heat generation was reduced after coating, indicating the thermal reaction between electrode and electrolyte was sucessfully suppressed by $Co_3(PO_4)_2$ nanoparticle coating.

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  3. The Effect of Coating Thickness on the Electrochemical Properties of a Li-La-Ti-O-coated Li[Ni0.3Co0.4Mn0.3]O2 Cathode vol.31, pp.11, 2008, https://doi.org/10.5012/bkcs.2010.31.11.3233
  4. Surface Surgery of the Nickel-Rich Cathode Material LiNi0.815Co0.15Al0.035O2: Toward a Complete and Ordered Surface Layered Structure and Better Electrochem vol.8, pp.50, 2008, https://doi.org/10.1021/acsami.6b11431