| Zr掺杂对正极材料Li(Ni0.9Co0.05Al0.05)O2的电化学性能影响 |
| Effects of Zirconium Substitution on Electrochemical Performance of Li(Ni0.9Co0.05Al0.05)O2 for Lithium-Ion Batteries |
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| 摘要: 通过控制结晶法制备类球形Ni0.9Co0.05Al0.03Zr0.02（OH）2前驱体，与LiOH·H2O均匀混合后，在750℃下于氧气中进行高温焙烧，最终合成正极材料Li（Ni0.9Co0.05Al0.03Zr0.02）O2。扫描电子显微镜（SEM）结果显示前驱体及正极材料具有良好的形貌；X射线衍射（XRD）表明材料具有规整的六方单相层状α-NaFeO2结构；能谱仪（EDXS）分析表明Zr元素在材料颗粒内部呈均匀分布。合成的LiNi0.9Co0.05Al0.03Zr0.02O2正极材料具有良好的电化学性能，在25℃，2.8~4.3 V充放电条件下，0.2C首次放电比容量为221.5 mAh·g-1，充放电效率90.3%，2C倍率充放电条件下容量仍达到192.7 mAh·g-1，100周循环后的容量保持率为92.2%。在55℃，2.8~4.3 V的高温充放电条件下，该材料的0.2C首次放电比容量可达236.2 mAh·g-1，2C充放电倍率下循环100周容量保持率为85.1%。 |
| 关键词: 锂离子电池 正极材料 共沉淀 锆掺杂 |
| 基金项目: 国家自然科学基金（No.51602352）资助项目。 |
| Abstract: Spherical precursor Ni0.9Co0.05Al0.03Zr0.02(OH)2 was obtained by controlled crystallization method. A uniform mixture of Ni0.9Co0.05Al0.03Zr0.02(OH)2 and LiOH·H2O was sintered under 750℃ in O2 atmosphere to synthesize layered Li(Ni0.9Co0.05Al0.03Zr0.02)O2 cathode material. SEM images show that the precursor and cathode material have well morphology. XRD patterns show that the product possesse a well-layered α-NaFeO2 structure. EDXS images show the Zr element in the material is distributed evenly. The cells with the material as cathode display excellent electrochemical performance:an initial discharge capacity of 221.5 mAh·g-1 at 0.2C between 2.8 and 4.3 V with an initial coulombic efficiency of 90.3%, a discharge capacity of 192.7 mAh·g-1 at 2C and a capacity retention rate of 92.2% after 100 cycles at 25℃. As the temperature raised to 55℃, the discharge capacity was 236.2 mAh·g-1 at 0.2C in 2.8~4.3 V, and retained a capacity retention rate of 85.1% after 100 cycles at 2C. |
| Keywords: lithium-ion battery cathode material co-precipitation zirconium substitution |
| 投稿时间：2017-09-27 修订日期：2018-01-23 |
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| 谭潮溥,黄殿华,骆宏钧,杜柯,曹雁冰,胡国荣.Zr掺杂对正极材料Li(Ni0.9Co0.05Al0.05)O2的电化学性能影响[J].无机化学学报,2018,34(4):647-654. |
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