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The Synthesis and Electrochemical Behaviors of Li[Li0.1Ni0.35Mn0.55]O2 as Cathode Material

Author: WangMin
Tutor: WuZhiYuan
School: Wuhan University
Course: Physical and chemical
Keywords: lithium-ion batteries layered rich lithium cathode material co-precipitation
CLC: TM911
Type: Master's thesis
Year: 2005
Downloads: 300
Quote: 0
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Abstract


Lithium-ion batteries a new type of secondary batteries developed during 1990’s.Lithium manganese oxides have advantages as the positive active materials for lithium-ion batteries, such as nontoxicity, low cost etc. it also has disadvantages such as capacity fade, cycles problem etc . Li[Li1/3Mn2/3]O2 is inactive ,not only layered structure but also chemical properties is stabilization. So many people doped Ni, Co, Cr etc transitional metals in it ,substituted a part of Li+ and Mn4+ by Ni2+, Co2+, Cr3+ in 3b position, synthesized a new type of materials which have improved in cycling and safety properties.In this paper, we have prepared Li[Li0.1Ni0.35Mn0.55]O2 by improving co-precipitation. The experiment result show: the appropriate temperature is 900°C.In 3.04.4V potential window（vs.Li+/Li） the electrode of Li[Li0.1Ni0.35Mn0.55]O2 show electrochemical properties with a first discharged capacity of 159mAh/g and retaining 149.2mAh/g after 30 cycles at a current rate of 25 mA/g under room temperature.We prepared Li[Li0.1Ni0.35Mn0.55]0.95Co0.05O2 by the means as well as Li[Li0.1Ni0.35Mn0.55]O2. Studied the effect of doping a little Co on the electrochemical properties of Li[Li0.1Ni0.35Mn0.55]O2. In 3.04.4V potential window（vs.Li+/Li）the electrode of Li[Li0.1Ni0.35Mn0.55]0.95Co0.05O2 showed electrochemical properties with a first discharged capacity of 186.8mAh/g and retaining 181.2mAh/g after 40 cycles at a current rate of 25 mA/g under room temperature.At last, we studied the insertion of magnesium and zinc ion in Li[Li0.1Ni0.35Mn0.55]0.95Co0.05O2. In electrolyte 1molMg （ClO4） 2+ LiClO4/EC+DMC and the potential windows of (0.9 2.08V vs Zn2+/Zn ) the electrode of Li[Li0.1Ni0.35Mn0.55]0.95Co0.05O2 showed electrochemical properties with a first discharged capacity of 146mAh/g and retaining 117.7mAh/g after 30 cycles at a current rate of 25 mA/g under room temperature. In electrolyte 1mol Zn （ClO4）2+ LiClO4/EC+DMC and the potential windows of (0.9 2.08V vs Zn2+/Zn ) the electrode of Li[Li0.1Ni0.35Mn0.55]0.95Co0.05O2 showed electrochemical properties with a first discharged capacity of 100mAh/g and retaining 61.3mAh/g after 30 cycles at acurrent rate of 25 mA/g under room temperature. In electrolyte lmol Zn （CIO4） 2/EC+DMC and the potential windows of （0.9—2.08V vs Zn2+/Zn ） the electrode of LifLio.1Nio.35Mno.5530.95Coo.05O2 showed electrochemical properties with a first discharged capacity of 69.7mAh/g and retaining49.7mAh/g after 15cycles at a current rate of 25 mA/g under room temperature.

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CLC: > Industrial Technology > Electrotechnical > Independent power supply technology (direct power) > Chemical power sources,batteries, fuel cells
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