磷酸铁锂高温循环性能的改善

doi:10.19964/j.issn.1006-4990.2021-0678

Abstract

Abstract:

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

CLC Number:

TM912.9

XU Ruilin,ZHAO Lipeng,LIU Xingwei,LIU Huan,WANG Hao,XU Xiaoming,ZENG Tao. Improvement of high temperature cycling performance of LiFePO₄[J]. Inorganic Chemicals Industry, 2022, 54(9): 108-112.

Figures/Tables 9

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Table 3

References 16

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SOC/%	DCIR/mΩ		SOC/%	DCIR/mΩ
SOC/%	基础电解液体系	改善电解液体系	SOC/%	基础电解液体系	改善电解液体系
95	15.7	15.1	45	17.9	18.1
90	16.4	15.8	40	18.2	18.0
85	16.7	16.4	35	18.6	18.2
80	17.6	17.4	30	18.9	18.3
75	18.5	18.3	25	19.0	18.3
70	18.3	17.1	20	19.7	19.1
65	17.4	17.3	15	21.4	19.8
60	17.4	17.5	10	22.0	19.6
55	17.6	17.7	5	26.1	23.0
50	17.8	18.0	0	38.8	31.7

项目		初始极片厚度/μm	EOL极片厚度/μm	极片厚度变化率/%
正极片	改善电解液体系	155	160	3.2
正极片	基础电解液体系	155	169	9.0
负极片	改善电解液体系	114	128	12.3
负极片	基础电解液体系	114	147	28.9

电解液体系	电池负极表面w（Fe）/10^-6
基础电解液	146.7
改善电解液	73.5

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Improvement of high temperature cycling performance of LiFePO₄

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Improvement of high temperature cycling performance of LiFePO4