[1]林锦芳,李琦旸.新型复合氟化碳正极材料的制备及其电化学性能研究[J].中国材料进展,2021,40(08):567-572.[doi:10.7502/j.issn.1674-3962.202104025]
 LIN Jinfang,LI Qiyang.Study on Preparation and Electrochemical Properties of Novel Composite Fluorinated Carbon Cathode Material[J].MATERIALS CHINA,2021,40(08):567-572.[doi:10.7502/j.issn.1674-3962.202104025]
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新型复合氟化碳正极材料的制备及其电化学性能研究()
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中国材料进展[ISSN:1674-3962/CN:61-1473/TG]

卷:
40
期数:
2021年第08期
页码:
567-572
栏目:
出版日期:
2021-08-30

文章信息/Info

Title:
Study on Preparation and Electrochemical Properties of Novel Composite Fluorinated Carbon Cathode Material
文章编号:
1674-3962(2021)08-0567-06
作者:
林锦芳李琦旸
(惠州亿纬锂能股份有限公司,广东 惠州 516000)
Author(s):
LIN Jinfang LI Qiyang
(EVE Energy Co., Ltd., Huizhou 516000, China)
关键词:
锂/氟化碳电池正极材料复合分级氟化碳作用机理电化学性能
Keywords:
lithium/fluorinated carbon battery cathode material composite hierarchical fluorinated carbon reaction mechanism electrochemical performance
分类号:
TB332;TM911
DOI:
10.7502/j.issn.1674-3962.202104025
文献标志码:
A
摘要:
锂/氟化碳电池具有高达2180 Wh·kg-1的理论能量密度,但因氟化碳正极材料导电性差、振实密度低,导致该材料在电池应用中存在容量发挥率低的问题。前期研究表明,氟化碳材料颗粒尺寸、比表面积及氟化度等理化性质对其电子导电性和容量发挥率有显著影响。在研究了分级氟化碳材料微观形貌、比表面积及粒径的基础上,使用物理研磨分散方法制备了新型复合分级氟化碳正极材料。通过调控分级氟化碳材料的质量比例,研究了复合氟化碳正极材料的形貌、极片结构及电化学作用机理,并进一步对比了以复合氟化碳材料为正极材料的电池的阻抗及电化学性能。研究结果表明,采用复合分级氟化碳材料减少了极片的孔隙率,增加了颗粒之间的接触紧密度,有效降低了电池的电荷转移电阻,相比于采用单一氟化碳CF01为正极材料的电池,采用复合分级氟化碳CF73为正极材料的电池的电阻下降了62%,比能量提升了4.1%。
Abstract:
The theoretical energy density of lithium/fluorinated carbon battery (Li/CFx) is as high as 2180 Wh·kg-1. However, due to the poor electrical conductivity and low vibrational density of the fluorinated carbon (CFx), there is a problem of low capacity utilization rate of the CFx materials in battery applications. Previous studies have shown that the physical properties and chemical properties such as particle size, specific surface area and degree of fluorination have a great influence on the electronic conductivity and capacity utilization of CFx. In this paper, based on the study of the microstructure, specific surface area and particle size of hierarchical CFx, novel composite hierarchical CFx were prepared by physical ball milling method. By adjusting the mass ratio of hierarchical CFx, the micro morphology, electrode structure and electrochemical mechanism of the novel composite CFx were studied, and the impedance and electrochemical performance of batteries with composite CFx as cathode material were further compared. The results show that the novel composite CFx reduces the porosity of the electrode, increases the contact tightness between the particles and effectively reduces the charge transfer resistance of the battery. The battery uses CF73 composite as cathode material, whose resistance decreases by 62% and specific energy increases by 4.1% compared with the battery using single CF01 as cathode material.

备注/Memo

备注/Memo:
收稿日期:2021-04-19 修回日期:2021-06-15 第一作者:林锦芳,女,1992年生,硕士研究生通讯作者:李琦旸,女,1991年生,博士, Email:liqwwb@163.com
更新日期/Last Update: 2021-07-31