摘要
为了提高水系锂离子电池的电化学性能,以MnCO3和Li2CO3为原料,采用固相法合成了LiMn2O4材料,并通过化学氧化法在LiMn2O4材料表面包覆聚吡咯(PPy),作为水系锂离子电池的正极材料,并与作负极的活性炭组装成扣式电池,测定其电化学性能。结果表明PPy包覆之后,LiMn2O4的比容量从52.97mAh/g提高到了75.01mAh/g,首次充放电效率从87%提高到90%;LiMn2O4循环1000次之后,比容量衰减为86%,经过包覆之后,在1000次循环之后比容量还可以保持在91%以上。PPy包覆LiMn2O4不但提高了水系锂离子电池的比容量和首次充放电效率,而且提高了循环性能。
In order to improve the electrochemical performance of aqueous lithium ion battery, LiMn 2O 4 material was synthesized by solid phase method using MnCO 3 and Li 2CO 3 as raw materials, and was coated with polypyrrole (PPy ) by chemical oxidation. The electrochemical properties were determined by means of a button cell with prepared materials as the positive electrode and the activated carbon as the negative electrode. It was found that after the coating of PPy, the specific capacity of LiMn 2O 4 was increased from 52.97 mAh/g to 75.01 mAh/g, and the first charging and discharging efficiency was increased from 87% to 90%. The specific capacity of LiMn 2O 4 decayed to 86% after 1000 cycles. After being coated, the specific capacity can remain above 91% after 1000 cycles. The experimental results showed that not only the specific capacity and the initial charge and discharge efficiency but also the cycling performance of aqueous lithium ion battery was greatly improved using LiMn 2O 4 coated with PPy as the positive material.
作者
丁伟
卓泽旭
Ibinewo Michael
刘志凤
王高军
DING Wei;ZHUO Ze-xu;Ibinewo Michael;LIU Zhi-feng;WANG Gao-jun(School of Chemistry and Chemical Engineering, Shaoxing University, Zhejiang Shaoxing 312000, China)
出处
《广州化工》
CAS
2019年第13期47-49,68,共4页
GuangZhou Chemical Industry
基金
浙江省重大科技专项重点工业项目“石墨烯导电剂在高能量密度动力锂电池中应用”(2015C01002)
