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Improvement of high temperature cycling performance of LiFePO4
Received date: 2021-11-10
Online published: 2022-09-22
LiFePO4 has stable structure and excellent cycle performance，but with the continuous improvement of the quality assurance requirements of the host manufacturer，LiFePO4 still faces the situation that the high?temperature cycle performance can not meet the requirements of customers.Taking LiFePO4 cathode lithium?ion battery as the research object，the effect of the basic electrolyte system and the improved electrolyte[adding lithium difluorodioxalate borate（LiODFB） to the basic electrolyte] system on the high-temperature cycle performance of the battery were compared.The non?destructive analysis methods such as DC internal resistance（DCIR），electrochemical AC impedance spectroscopy（EIS），dQ/dU（change of battery capacity in constant voltage interval） curve were used to compare the data of the recycled battery.The results showed that the charge transfer impedance of the battery with improved electrolyte system was further reduced.Through the dissection of the battery，the thickness analysis，X-ray diffraction（XRD） analysis，scanning electron microscope（SEM） analysis and inductively coupled plasma emission spectroscopy（ICP） element analysis of the battery electrode sheets of the two electrolyte systems were carried out.The results showed that the battery with improved electrolyte system had obvious effects in inhibiting the side reactions on the surface of the negative electrode and reducing the dissolution of positive iron，so the high temperature cycle performance of the battery was better.
Key words： LiFePO4; high temperature cycle; electrolyte; anode film
Ruilin XU , Lipeng ZHAO , Xingwei LIU , Huan LIU , Hao WANG , Xiaoming XU , Tao ZENG . Improvement of high temperature cycling performance of LiFePO4[J]. Inorganic Chemicals Industry, 2022 , 54(9) : 108 -112 . DOI: 10.19964/j.issn.1006-4990.2021-0678
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