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The Study of Li-rich Layered Solid-Solution Cathode Materials for Lithium Ion Batteries

Author: LiuBing
Tutor: LiDeCheng;ZhengJunWei
School: Suzhou University
Course: Physical and chemical
Keywords: Li-ion battery Cathode material Li-rich layered solid solution surface modification
CLC: TM912
Type: Master's thesis
Year: 2011
Downloads: 294
Quote: 0
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Abstract


Li-ion batteries are extensively used in mobile communication equipments and electronic devices due to their merits like high energy density, low weight, long life, etc. Compared with commercialized LiCoO2, solid solution materials, Li2MnO3-LiMO2, have drawn researchers’attention for their relative high capacity and low cost. Nevertheless, this type of material tends to exhibit rapid capacity fade during cycles and poor performances when operated at a high current density. In order to overcome these problems, much effort has been done. In this thesis, the structural and electrochemical properties of Li-rich layered solid-solution system Li[LixNiyMnzCo1-x-y-z]O2 were studied, and their battery performances were improved by composition optimization together with surface modification.(1-x)Li1.17Ni0.25Mn0.58O2·xLiNi0.33Mn0.33Co0.33O2 (x=0, 0.3, 0.5, 0.7) are synthesized by a mixed hydroxides method. Their initial charge/discharge capacities are closely related to their composition. Moreover, the sample whose composition is in the range of Mn>0.5 and 0<Co<0.1 would exhibit relatively high initial charge/discharge capacities.The surface of Li[Li0.2Ni0.18Mn0.59Co0.03]O2 can be modified with LiCoPO4 through co-precipitation method. The resultant LiCoPO4 particles are in nana-scale and accumulate on the surface of the Li[Li0.2Ni0.18Mn0.59Co0.03]O2 particles. The surface modification by LiCoPO4 is shown to significantly improve both the cyclic performance and the rate capability of Li[Li0.2Ni0.18Mn0.59Co0.03]O2. After 40 cycles, the modified cathode materials’reversible capacity is 231 mAh·g-1, which is much higher than that of pristine Li[Li0.2Ni0.18Mn0.59Co0.03]O2.

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CLC: > Industrial Technology > Electrotechnical > Independent power supply technology (direct power) > Battery
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