当前位置: X-MOL 学术Nano-Micro Lett. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
The Surface Coating of Commercial LiFePO4 by Utilizing ZIF-8 for High Electrochemical Performance Lithium Ion Battery
Nano-Micro Letters ( IF 31.6 ) Pub Date : 2017-08-26 , DOI: 10.1007/s40820-017-0154-4
XiaoLong Xu , CongYu Qi , ZhenDong Hao , Hao Wang , JinTing Jiu , JingBing Liu , Hui Yan , Katsuaki Suganuma

The requirement of energy storage equipment need to develop the lithium ion battery (LIB) with high electrochemical performance. The surface modification of commercial LiFePO4 (LFP) by utilizing zeolitic imidazolate frameworks-8 (ZIF-8) offers new possibilities for commercial LFP with high electrochemical performances. In this work, the carbonized ZIF-8 (CZIF-8) was coated on the surface of LFP particles by the in-situ growth and carbonization of ZIF-8. Transmission electron microscopy (TEM) indicates that there is an approximate 10 nm coating layer with metal zinc and graphite-like carbon on the surface of LFP/CZIF-8 sample. The N2 adsorption and desorption isotherm suggests that the coating layer has uniform and simple connecting mesopores. As cathode material, LFP/CZIF-8 cathode active material delivers a discharge specific capacity of 159.3 mAh g-1 at 0.1 C and a discharge specific energy of 141.7 mWh g-1 after 200 cycles at 5.0 C (the retention rate is approximate 99%). These results are attributed to the synergy improvement of the conductivity, the lithium ion diffusion coefficient, and the degree of freedom for volume change of LFP/CZIF-8 cathode. This work will contribute to the improvement of the cathode materials of commercial LIB.



中文翻译:

ZIF-8用于高电化学性能锂离子电池的商用LiFePO4表面涂层

储能设备的需求需要开发具有高电化学性能的锂离子电池(LIB)。利用沸石咪唑酸酯骨架8(ZIF-8)对商用LiFePO 4(LFP)进行表面改性,为具有高电化学性能的商用LFP提供了新的可能性。在这项工作中,通过ZIF-8的原位生长和碳化将碳化的ZIF-8(C ZIF-8)涂覆在LFP颗粒的表面上。透射电子显微镜(TEM)表明,在LFP / C ZIF-8样品的表面上存在一个约10 nm的涂层,该涂层具有金属锌和类石墨碳。N 2吸附和解吸等温线表明涂层具有均匀且简单的连接中孔。作为正极材料,LFP / C ZIF-8正极活性物质在5.0 C下200次循环后,在0.1 C下的放电比容量为159.3 mAh g -1,在14 C下的放电比能量为141.7 mWh g -1 99%)。这些结果归因于电导率,锂离子扩散系数和LFP / C ZIF-8阴极的体积变化自由度的协同改进。这项工作将有助于改进商业LIB的阴极材料。

更新日期:2017-11-10
down
wechat
bug