富锂层状正极材料Li1.2Mn0.54Ni0.13Co0.13O2的二次颗粒粒径对其倍率性能的影响

引用本文: 尹艳萍, 卢华权, 王忠, 孙学义, 庄卫东, 卢世刚. 富锂层状正极材料Li_1.2Mn_0.54Ni_0.13Co_0.13O₂的二次颗粒粒径对其倍率性能的影响[J]. 无机化学学报, 2015, 31(10): 1966-1970. doi: 10.11862/CJIC.2015.271 shu

Citation: YIN Yan-Ping, LU Hua-Quan, WANG Zhong, SUN Xue-Yi, ZHUANG Wei-Dong, LU Shi-Gang. Effect of Different Second Particle Size on Rate Capability of Li-Rich Layered Cathode Materials Li_1.2Mn_0.54Ni_0.13Co_0.13O₂[J]. Chinese Journal of Inorganic Chemistry, 2015, 31(10): 1966-1970. doi: 10.11862/CJIC.2015.271 shu

富锂层状正极材料Li_1.2Mn_0.54Ni_0.13Co_0.13O₂的二次颗粒粒径对其倍率性能的影响

1.
北京有色金属研究总院动力电池研究中心, 北京 100088

通讯作者: 庄卫东,E-mail:wdzhuang@126.com

基金项目:
国家自然科学基金(No.51302017) (No.51302017)

北京市科技计划(No.Z121100006712002) (No.Z121100006712002)

863计划(2012AA110102)资助项目。 (2012AA110102)

摘要: 采用碳酸盐共沉淀的方法成功制备了不同二次颗粒粒径的富锂层状正极材料Li_1.2Mn_0.54Ni_0.13Co_0.13O₂。并运用X射线衍射(XRD)、场发射扫描电镜(FESEM)、激光粒度测试和电化学测试等手段对所得材料的结构、形貌、粒度分布及电化学性能进行表征。结果显示,不同二次颗粒粒径的Li_1.2Mn_0.54Ni_0.13Co_0.13O₂在材料结构上没有明显的差别,且首次放电比容量接近,均达到了281 mAh·g^-1。但是,二次颗粒粒径越小,富锂层状材料的表现出的倍率性能越优异,当二次颗粒的D₅₀为4.59μm,其在3C倍率下的放电容量达到了199 mAh·g^-1。这是因为二次颗粒粒径越小,富锂层状材料可更好的与导电剂和电解液接触,且锂离子的扩散路径更短,从而表现出更好的倍率特性。

关键词:

锂离子电池;正极材料;富锂层状;二次颗粒粒径;电化学性能

English

Effect of Different Second Particle Size on Rate Capability of Li-Rich Layered Cathode Materials Li_1.2Mn_0.54Ni_0.13Co_0.13O₂

1.
R & D Center for Vehicle Battery and Energy Storage, General Research Institute for Non-ferrous Metals, Beijing 100088, China

Corresponding author: 庄卫东,E-mail:wdzhuang@126.com

Received Date: 02 February 2015
Fund Project:
国家自然科学基金(No.51302017)

北京市科技计划(No.Z121100006712002)

863计划(2012AA110102)资助项目。

Abstract: Li-rich layered cathode materials Li_1.2Mn_0.54Ni_0.13Co_0.13O₂ with different second particle size distribution were prepared by carbonate based co-precipitation. The samples were characterized by X-ray diffraction (XRD), field emission scanning electron microscope (FESEM), laser particle size analyze and electrochemical performance tests. The results showed that there were no significant differences in structures between the Li_1.2Mn_0.54Ni_0.13Co_0.13O₂ materials with different second particle size, and the three samples had similar discharge capacities (281 mAh·g^-1) for the first cycle. However, the sample with smaller second particle size showed a much superior rate capability to the sample with bigger particle size. When the D₅₀ of second particle size reduced to 4.59 μm, the sample delivered a discharge capacity of 199 mAh·g^-1 at 3C-rate. The improvement in rate capability could be attributed to the smaller particle size, which gives a better contact between the active material and the electrolyte/conductive agent, at the same time a shorter diffusion path.

Key words:

lithium-ion batteries;cathode material;Li-rich layered;second particle size;electrochemical performance

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1.
沈阳化工大学材料科学与工程学院沈阳 110142

富锂层状正极材料Li_1.2Mn_0.54Ni_0.13Co_0.13O₂的二次颗粒粒径对其倍率性能的影响

通讯作者: 庄卫东,E-mail:wdzhuang@126.com

English

Effect of Different Second Particle Size on Rate Capability of Li-Rich Layered Cathode Materials Li_1.2Mn_0.54Ni_0.13Co_0.13O₂

Corresponding author: 庄卫东,E-mail:wdzhuang@126.com

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