Concentration-Controlled and Phytic Acid-Assisted Synthesis of Self-Assembled LiFePO4 as Cathode Materials for Lithium-Ion Battery

Yin Li; Keyu Zhang; Zhengjie Chen; Yunke Wang; Li Wang; Feng Liang; Yaochun Yao

추천

검색

자료유형: 학술저널

저자정보: Yin Li (Kunming University of Science and Technology) Keyu Zhang (Kunming University of Science and Technology) Zhengjie Chen (Kunming University of Science and Technology) Yunke Wang (Kunming University of Science and Technology) Li Wang (Kunming University of Science and Technology) Feng Liang (Kunming University of Science and Technology) Yaochun Yao (Kunming University of Science and Technology)

저널정보: 성균관대학교 성균나노과학기술원 NANO NANO Vol.15 No.2

발행연도: 2020.1

수록면: 21 - 31 (11page)

이용수

📌

연구주제

📖

연구배경

🔬

연구방법

🏆

연구결과

초록· 키워드

오류제보하기

The olivine LiFePO4 with various morphologies and different growth lattice planes was prepared by a controllable hydrothermal method with changing precursor concentration and using phytic acid as phosphorus source. The microstructure, crystal orientation and electrochemical performance of the prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HR-TEM) and charge–discharge tests. The results show that the morphologies of all samples change from spindle-like to hierarchical plate-like and then to long plate-like shape, and the main exposed facets transform from (100) to (001). This indicates that the precursor concentration and phytic acid play important roles in exposing facets and controlling the morphology of LiFePO4. In order to illustrate these phenomena, a reasonable assembly process is provided and the formation is explained. Li ion diffusion coefficient along [100] and [001] directions was calculated by using electrochemical impedance spectroscopy (EIS). The results show that the diffusion coefficient of (100) facet is higher than that of (001) facet, indicating a good electrochemical performance for (100) facet. In addition, the capacity test is carried out, which also confirms the above results. With the precursor concentration of 0.5 M, the obtained LiFePO4 with self-assembled hierarchical structure, smaller size and (100) facet shows the best electrochemical performance: 162.1 mAh/g at 0.1C and 112.4 mAh/g at 10 C. Using phytic acid as phosphorus source and controlling precursor concentration to prepare high performance LiFePO4 open up a new prospect for the production of cathode materials for lithium ion batteries.

#Lithium iron phosphate #solvothermal #self-assembly #crystal morphology #lithium-ion batteries

참고문헌 (48)

참고문헌 신청

Y. -C. Liang / 2015 / Chem. Electro. Chem 9:1227

A. Manthiram / 2016 / Adv. Energy Mater 6:1501010

H. -J. Kim / 2016 / Nano Lett 16:282

W. -Q. Lv / 2016 / Appl. Phys. Lett 108:083901~083901

Z. -J. Li / 2016 / Nano Lett 16:795

함께 읽어보면 좋을 논문

논문 유사도에 따라 DBpia 가 추천하는 논문입니다. 함께 보면 좋을 연관 논문을 확인해보세요!