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首页> 外文期刊>International Journal of Electrochemical Science >Synthesis and Characterization of Li(Li0.2Mn0.4Fe0.2M0.2)O2 (M=Co, Ni, Cr, Al) Cathode Materials for Li-ion Batteries
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Synthesis and Characterization of Li(Li0.2Mn0.4Fe0.2M0.2)O2 (M=Co, Ni, Cr, Al) Cathode Materials for Li-ion Batteries

机译：Li（Li 0.2 Mn 0.4 Fe 0.2 M 0.2 ）O 2 的合成与表征sub>（M = Co，Ni，Cr，Al）锂离子电池正极材料

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Li(Li0.2Mn0.4Fe0.2M0.2)O2 (M=Co, Ni, Cr, Al) cathode materials were prepared by citric acid assistedsol-gel process, and the effects of ion-doping on the structural and electrochemical properties of as- prepared materials were investigated. The results show that both Co- and Ni- doped samples with purelayered NaFeO2 phase are easily prepared, Al-doped sample can only be obtained while annealed ato o 600 C ~700 C, but Cr-doped samples always contain impure phase of Li2CrO4 and LiFeO2. All ofo doped samples prepared at 700 C exhibit the highest discharge capacity. Among them, Cr doping isnot beneficial to electrochemical performance due to existence of impure phase of Li2CrO4 andLiFeO2. The Al-doped sample show higher capacity than Cr-doped one, but the notable low voltageplateau is similar. In contrast, both Co- and Ni- doped samples deliver higher capacity and voltageplateau, better structural stability during cycling. The Ni-doped sample presents higher voltage plateauthan Co-doped one due to better reduction of the phase transformation from layered structure to spinel- like structure, showing more promising in view of cost and toxicity. It provides an initial capacity of-1 210 mAhg and 86.3% capacity retention after 21 cycles. The electrochemical performance isexpected to be further improved by Al- and Ni- co-doping in future.
机译：采用柠檬酸辅助溶胶-凝胶法制备了Li（Li0.2Mn0.4Fe0.2M0.2）O2（M = Co，Ni，Cr，Al）正极材料，并研究了离子掺杂对其结构和电化学性能的影响。研究了准备好的材料。结果表明，具有纯层NaFeO2相的Co和Ni掺杂样品均易于制备，只有在600 C〜700 C的退火温度下才能获得Al掺杂样品，而Cr掺杂样品始终含有Li2CrO4和Ni杂质相。磷酸铁锂在700℃下制备的所有掺杂样品均显示出最高的放电容量。其中，Cr掺杂由于存在Li 2 CrO 4和LiFeO 2的不纯相而不利于电化学性能。掺杂铝的样品比掺杂铬的样品显示出更高的容量，但是值得注意的低电压平稳期相似。相反，掺Co和掺Ni的样品在循环过程中均具有更高的容量和更高的电压平稳性，并具有更好的结构稳定性。由于更好地减少了从层状结构到尖晶石状结构的相变，因此镍掺杂的样品呈现出较高电压的板式共掺杂，这在成本和毒性方面显示出更大的希望。 21个循环后，它的初始容量为1210 mAhg，容量保持率为86.3％。预期将来通过Al和Ni共掺杂可以进一步提高电化学性能。

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