Effect of Cr doping on the structural,electrochemical properties of Li[Li0.2Ni0.2−x/2Mn0.6−x/2Crx]O2 (x = 0, 0.02, 0.04, 0.06, 0.08) as cathode materials for lithium secondary batteries |
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Authors: | Li Fang Jiao Ming ZhangHua Tang Yuan Ming ZhaoJian Guo Wei WangXing Di Zhou Yong Mei Wang |
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Affiliation: | Institute of New Energy Material Chemistry, Nankai University, Tianjin 300071, China |
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Abstract: | Prospective positive-electrode (cathode) materials for a lithium secondary battery, viz., LiLi0.2Ni0.2−x/2Mn0.6−x/2Crx]O2 (x = 0, 0.02, 0.04, 0.06, 0.08), were synthesized using a solid-state pyrolysis method. The structural and electrochemical properties were examined by means of X-ray diffraction, cyclic voltammetry, SEM and charge–discharge tests. The results demonstrated that the powders maintain the α-NaFeO2-type layered structure regardless of the chromium content in the range x ≤ 0.08. The Cr doping of x = 0.04 showed improved capacity and rate capability comparing to undoped LiLi0.2Ni0.2Mn0.6]O2. ac impedance measurement showed that Cr-doped electrode has the lower impedance value during cycling. It is considered that the higher capacity and superior rate capability of Cr-doping samples would be ascribed to the reduced resistance of the electrode during cycling. |
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Keywords: | Lithium-ion battery Cathode material Cr-doped Electrochemical behavior Li[Li0 2Ni0 2&minus x/2Mn0 6&minus x/2Crx]O2 Layered |
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