摘要
以酚醛树脂为原料、正戊烷为发泡剂,采用发泡法制备了低比表面积的酚醛树脂硬碳。通过SEM、XRD、FTIR和N 2吸附/脱附等方式表征了不同发泡剂添加量下硬碳材料的表面形貌和结构,以金属锂为对电极制备纽扣半电池并测试了其电化学性能。结果分析表明:正戊烷质量分数为20%的硬碳比表面积为1.62 m^2·g^-1,平均孔径为6.406 nm,(002)晶面层间距d 002为0.394 nm,二维碳层尺寸L a为1.417 nm,平行层群尺寸L c为2.602 nm,碳产率为45.05%;在50 mA·g^-1的电流密度下,其首次比容量达到318.7 mAh·g^-1,首次库伦效率为68.9%,并且表现出良好的循环稳定性能和倍率性能。
This work presented a preparation approach for phenolic resin hard carbon with low specific surface area, which employed foaming method and took phenolic resin as raw material, N-Pentane as foaming agent. SEM, XRD, FTIR and N 2 adsorption/desorption were adopted to characterize the surface morphology and structural features of the obtained hard carbon samples with various addition amount of foaming agents. Furthermore, the button half-cell was assembled by taking lithium metal as the electrode and the electrochemical performance of the half-cell was measured. According to results, with quality score is 20% of N-Pentane, the hard carbon sample exhibited the specific surface area of 1.62 m^2·g^-1 , average pore size of 6.406 nm, d 002 of 0.394 nm, L a of 1.417 nm, L c of 2.602 nm, and carbon yield of 45.05%. Regarding to the electrochemical performance, hard carbon sample with 20% N-Pentane held the first specific capacity of 318.7 mAh·g^-1 , initial coulomb efficiency of 68.9% at current density of 50 mA·g^-1 and it also presented satisfactory cyclic stability and rate capacity.
作者
杨果
马壮
杨绍斌
董伟
沈丁
YANG Guo;MA Zhuang;YANG Shaobin;DONG Wei;SHEN Ding(College of Material Science and Engineering,Liaoning Technical University,Fuxin 123000;School of Metallurgy Engineering,Liaoning Institute of Science and Technology,Benxi 117004)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2019年第22期3820-3824,共5页
Materials Reports
基金
国家自然科学基金(21808095)~~
关键词
低比表面积
发泡
硬碳
锂离子电池
负极材料
low specific surface area
foaming
hard carbon
lithium ion battery
anode material
