制备条件对乙烯焦油调制包覆沥青性质的影响  

Effect of Preparation Conditions on the Properties of Ethylene Tar Based Coating Pitch

作　　者：郭永川 林琳 唐艳苹 王艳莉[1] 沈春银[1] 詹亮[1] GUO Yongchuan;LIN Lin;TANG Yanping;WANG Yanli;SHEN Chunyin;ZHAN Liang(State Key Laboratory of Chemical Engineering,School of Chemical Engineering,East China University of Science and Technology,Shanghai 200237,China;Jilin Jihua North Jinjiang Petrochemical Co.Ltd,Jilin 132000,Jilin,China)

机构地区：[1]华东理工大学化工学院,化学工程联合国家重点实验室,上海200237 [2]吉林市吉化北方锦江石化有限公司,吉林吉林132000

出　　处：《华东理工大学学报（自然科学版）》2024年第2期170-177,共8页Journal of East China University of Science and Technology

基　　金：国家自然科学基金(51472086,51002051,22075081,20806024)。

摘　　要：以乙烯焦油为原料,采用空气氧化法制得锂离子电池石墨类负极材料用包覆沥青。考察了氧化温度、空气流量和氧化时间对包覆沥青物化性质的影响,并采用元素分析、热重分析、傅里叶变换红外光谱和核磁共振等方法对包覆沥青的物化性质进行了表征。结果表明,提高氧化温度、增大空气流量和延长氧化时间均能提高所制包覆沥青的结焦值和软化点。在氧化温度、空气流量和氧化时间分别为310℃、120 L/h和10 h的最佳制备条件下,可制得具有较高碳含量(w=93.44%)、较高芳香度和较少侧链(以短链为主)的高品质包覆沥青,其软化点、结焦值、喹啉不溶物质量分数和收率分别为258.90℃、70.19%、0.97%和39.99%。改性后石墨负极材料在150次循环后的容量保持率为89.74%。Air oxidation method is used to prepare coating pitch as a surface modification material for the graphite anode materials of lithium-ion battery using ethylene tar as the raw material.The effects of air flow,oxidation reaction temperature and oxidation reaction time on the physicochemical properties of coating pitch were investigated,and the physicochemical properties of the obtained coating pitch were systematically characterized using elemental analysis,thermogravimetric analysis,Fourier transform infrared spectroscopy and nuclear magnetic resonance.The results show that,with the increase of oxidation temperature,air flow rate or oxidation time,the coking value and softening point of the produced coating pitch can be effectively improved.Under the optimal preparation conditions with the oxidation temperature of 310°C,air flow rate of 120 L/h and oxidation time of 10 h,a high-quality coating pitch with high carbon content(w=93.44%),high aromaticity and less side chains(mainly short chains)can be obtained.Its softening point,coking value,quinoline insoluble content(mass fraction)and yield are 258.9℃,70.19%,0.97%and 39.99%,respectively.The modified anode material of graphite shows a significant improvement in the capacity retention rate(89.74%)after 150 cycles.

关 键 词：乙烯焦油 包覆沥青 空气氧化 锂离子电池 改性 

分 类 号：TQ524[化学工程—煤化学工程]