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Citation: TANG Zhi-yuan, LU Xing-he, ZHANG Na. The Anion-cation Multiple Doping Effect of Spinel Cathode Materials on Electrochemical Speciality[J]. Acta Physico-Chimica Sinica, ;2005, 21(08): 934-938. doi: 10.3866/PKU.WHXB20050822 shu

The Anion-cation Multiple Doping Effect of Spinel Cathode Materials on Electrochemical Speciality

1.
School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072； 2Hebei University of Engineering, Handan 056038

Received Date: 13 December 2004
Available Online: 15 August 2005

Li_1.02CraCobLacMn₂－a－b－cFyO₄－y (a,b,c＝0, 0.01, 0.02; y＝0, 0.02) doped with several ions (anion-cation) was prepared by solid-state reaction method. X-ray diffraction showed that all the samples had perfect spinel strucure. The results of the charge/discharge curves showed that multiple doping spinel Li_1.02Cr_0.01Co_0.02La_0.01Mn_1.96F_0.02O_3.98 had better performance than those undoped or cation-doped materials according to the inhibition of decline of reversible capacity of spinel at 25 ℃. Besides that, the multiple doping spinel also had ideal discharge capacity. And the cycle performance(120.1～113.5 mAh•g-1) was improved so obviously that 94.5% of the initial capacity was preserved after 80 cycles. Meanwhile, the elevated temperature(55 ℃) perforance of the material was improved. With the spinel Li_1.02CraCobLacMn₂－a－b－cFyO₄－y as working electrode, Li as counter electrode and reference electrode, electro-chemical impedance tests showed that this material possessed od charge/discharge reversible capability and had the lowest impedance on the stage of charge/discharge.
- Lithium-ion batteries;Spinel;Anion-cation doping;Cathode material; Electrochemical performance
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