| 碳酸盐共沉淀法可控制备超高倍率锂离子电池正极材料LiNi1/3Co1/3Mn1/3O2 | |
| Controllable Preparation of Ultra-High Rate LiNi1/3Co1/3Mn1/3O2 Cathode Through Carbonate Co-precipitation Method for Li-Ion Batteries | |
| 摘要: 采用碳酸盐共沉淀法通过调节NH3·H2O用量来实现可控制备超高倍率纳米结构LiNi1/3Co1/3Mn1/3O2正极材料。NH3·H2O用量会对颗粒的形貌、粒径、晶体结构以及材料电化学性能产生较大的影响。X射线衍射（XRD）分析和扫描电镜（SEM）结果表明，随着NH3·H2O用量的降低，一次颗粒形貌由纳米片状逐渐过渡到纳米球状，且nNH3·H2O：（nNi+nCo+nMn）=1：2样品晶体层状结构最完善、Li+/Ni2+阳离子混排程度最低。电化学性能测试结果也证实了nNH3·H2O：（nNi+nCo+nMn）=1：2样品具有最优异的循环稳定性和超高倍率性能。具体而言，在2.7~4.3 V，1C下循环300次后的放电比容量为119 mAh·g-1，容量保持率为81%，中值电压基本无衰减（保持率为97%）。在100C（18 Ah·g-1）的超高倍率下，放电比容量还能达到56 mAh·g-1，具有应用于高功率型锂离子电池的前景。此NH3·H2O比例值对于共沉淀法制备其他高倍率、高容量的正/负极氧化物材料具有一定的工艺参考价值。 | |
| 关键词: 锂离子电池 正极材料 碳酸盐共沉淀法 超高倍率性能 | |
| 基金项目: 国家自然科学基金（No.21506133）和四川省科技支撑计划（No.2014GZ0077）资助项目。 | |
| Abstract: The ultra-high rate nanostructured LiNi1/3Co1/3Mn1/3O2 cathode is controllably prepared by the carbonate co-precipitation method through tailoring the amount of the NH3·H2O. The NH3·H2O has a great effect on morphology, particle size, crystal structure and electrochemical performance. Powder X-ray diffraction (XRD)and scanning electron microscopy (SEM)results indicate that the morphology of primary particle is changed from nano-plate to nano-sphere with the decreasing of the NH3·H2O, and the sample with ratio nNH3·H2O: (nNi+nCo+nMn)=1:2 has the well-ordered-NaFeO2 structure and the lowest cation mixing (Li+/Ni2+). Electrochemical results also confirm that the sample with ratio nNH3·H2O: (nNi+nCo+nMn)=1:2 has the best cycling stability and ultra-high rate capability. Specifically, it delivers a discharge capacity of 119 mAh·g-1 between 2.7 and 4.3 V at 1C after 300 cycles with outstanding capacity retention of 81%, and the mid-point potential retention is 97%. This sample can still deliver a high discharge capacity of 56 mAh·g-1 even at the ultra-high rate 100C (18 mAh·g-1), which has the prospect to be applied in high power lithium ion battery. This nNH3·H2O ratio could provide some valuable reference for synthesizing other high-rate and high-capacity anode/cathode oxides. | |
| Keywords: lithium-ion battery cathode material carbonate co-precipitation method ultra-high rate performance | |
| 投稿时间：2016-08-12 修订日期：2016-10-15 | |
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| 郑卓,滑纬博,吴振国,向伟,钟本和,郭孝东.碳酸盐共沉淀法可控制备超高倍率锂离子电池正极材料LiNi1/3Co1/3Mn1/3O2[J].无机化学学报,2017,33(2):307-314. | |
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