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用于锂离子电池的高性能微/纳米级磷酸铁锂/石墨烯阴极的一步微波合成法

One-Step Microwave Synthesis of Micro/Nanoscale LiFePO/Graphene Cathode With High Performance for Lithium-Ion Batteries.

作者信息

Liu Shulong, Yan Ping, Li Haibin, Zhang Xiaobo, Sun Wei

机构信息

School of Physics and Electronic Information/Information College, Huaibei Normal University, Huaibei, China.

School of Life Science, Huaibei Normal University, Huaibei, China.

出版信息

Front Chem. 2020 Feb 25;8:104. doi: 10.3389/fchem.2020.00104. eCollection 2020.

DOI:10.3389/fchem.2020.00104
PMID:32161747
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7052380/
Abstract

In this study, micro/nanoscale LiFePO/graphene composites are synthesized successfully using a one-step microwave heating method. One-step microwave heating can simplify the reduction step of graphene oxide and provide a convenient, economical, and effective method of preparing graphene composites. The structural analysis shows that LiFePO/graphene has high phase purity and crystallinity. The morphological analysis shows that LiFePO/graphene microspheres and micron blocks are composed of densely aggregated nanoparticles; the nanoparticle size can shorten the diffusion path of lithium ions and thus increase the lithium-ion diffusion rate. Additionally, the graphene sheets can provide a rapid transport path for electrons, thus increasing the electronic conductivity of the material. Furthermore, the nanoparticles being packed into the micron graphene sheets can ensure stability in the electrolyte during charging and discharging. Raman analysis reveals that the graphene has a high degree of graphitization. Electrochemical analysis shows that the LiFePO/graphene has an excellent capacity, high rate performance, and cycle stability. The discharge capacities are 166.3, 156.1, 143.0, 132.4, and 120.9 mAh g at rates of 0.1, 1, 3, 5, and 10 C, respectively. The superior electrochemical performance can be ascribed to the synergy of the shorter lithium-ion diffusion path achieved by LiFePO nanoparticles and the conductive networks of graphene.

摘要

在本研究中，采用一步微波加热法成功合成了微纳尺度的LiFePO/石墨烯复合材料。一步微波加热可以简化氧化石墨烯的还原步骤，并提供一种方便、经济且有效的制备石墨烯复合材料的方法。结构分析表明，LiFePO/石墨烯具有高相纯度和结晶度。形态分析表明，LiFePO/石墨烯微球和微米块由密集聚集的纳米颗粒组成；纳米颗粒尺寸可以缩短锂离子的扩散路径，从而提高锂离子扩散速率。此外，石墨烯片层可以为电子提供快速传输路径，从而提高材料的电子导电性。此外，填充在微米级石墨烯片层中的纳米颗粒可以确保在充放电过程中在电解质中的稳定性。拉曼分析表明，石墨烯具有高度的石墨化程度。电化学分析表明，LiFePO/石墨烯具有优异的容量、高倍率性能和循环稳定性。在0.1、1、3、5和10 C倍率下的放电容量分别为166.3、156.1、143.0、132.4和120.9 mAh g。优异的电化学性能可归因于LiFePO纳米颗粒实现的较短锂离子扩散路径与石墨烯导电网络的协同作用。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b9c1/7052380/9b3007145fae/fchem-08-00104-g0011.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b9c1/7052380/c2a5b04e85f0/fchem-08-00104-g0002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b9c1/7052380/3a392a7a8afb/fchem-08-00104-g0003.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b9c1/7052380/9479593e5d37/fchem-08-00104-g0005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b9c1/7052380/ddcd81c29b4d/fchem-08-00104-g0006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b9c1/7052380/26a12ba28cef/fchem-08-00104-g0007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b9c1/7052380/0736e32d56fb/fchem-08-00104-g0008.jpg
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