锂离子电池片状四氧化三钴负极的合成及改性

发布时间：2018-04-04 12:25

本文选题：CoO　切入点：片状　出处：《物理化学学报》2014年06期

【摘要】：采用液相沉淀法结合低温固相热解法合成了锂离子电池片状Co3O4负极.通过X射线粉体衍射(XRD)、Brunauer-Emmett-Teller(BET)比表面积分析、扫描电子显微镜(SEM)及恒电流充放电等表征手段,发现该Co3O4为立方相,结晶完整且无杂质,由直径为1.5-3.0μm、厚度约为100-300 nm的不规则片状颗粒组成,比表面积约为30.5 m2·g-1;其比容量高且容量保持率好,在0.1C倍率下,首次放电容量高达1444.5 mAh·g-1,50次循环后充电容量仍大于1100.0 mAh·g-1;但在高倍率(1C)下,50次循环后充电容量保持率仅为75.3%,倍率性能一般.故采用碳纳米管(CNTs)掺杂改性,结果表明:在1C倍率下,70次循环后复合材料充电容量保持率为96.3%;在2C倍率下,50次循环后充电容量保持率仍高达97.0%,倍率性能显著提升.
[Abstract]:The Co3O4 anode of lithium ion battery was synthesized by liquid precipitation method and low temperature solid phase pyrolysis.By means of specific surface area analysis, scanning electron microscopy (SEM) and constant current charge-discharge (CSCC) characterization of Co3O4, it was found that the Co3O4 was cubic phase, crystal complete and free of impurity, and was characterized by X-ray powder diffraction (XRD), Brunauer-Emmett-Teller-Bet (BET), scanning electron microscopy (SEM) and constant current charge-discharge.It is composed of irregular flake particles with diameter of 1.5-3.0 渭 m and thickness of 100-300 nm, with a specific surface area of 30.5 m ~ 2 g ~ (-1), with high specific capacity and good capacity retention.The first discharge capacity is as high as 1444.5 mAh g ~ (-1) and the charge capacity is still greater than 1100.0 mAh g ~ (-1) after 50 cycles, but the charge capacity retention after 50 cycles is only 75.3% at high rate (1 C).The results show that the charge capacity retention rate of the composite is 96.3after 70 cycles at 1 C ratio, and the charge capacity retention rate is up to 97.0 after 50 cycles at 2C ratio, and the performance of the composite is improved significantly.
【作者单位】：清华大学核能与新能源技术研究院;清华大学精细陶瓷北京市重点实验室;
【基金】：国家自然科学基金(51274130)资助项目~~
【分类号】：TM912

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