Fe_(2)O_(3)/C锂离子电池负极材料的制备及电化学性能研究  

Preparation and electrochemical properties ofFe_(2)O_(3)/C negative electrode materials for lithium ion batteries

作　　者：刘科 钟志成 LIU Ke;ZHONG Zhicheng(Hubei Key Laboratory of Low Dimensional Optoelectronic Material and Devices,Xiangyang 441000,China;School of Physics and Electronic Engineering,Hubei University of Arts and Science,Xiangyang 441000,China)

机构地区：[1]低维光电材料与器件湖北省重点实验室,湖北襄阳441000 [2]湖北文理学院物理与电子工程学院,湖北襄阳441000

出　　处：《功能材料》2023年第10期10175-10179,10230,共6页Journal of Functional Materials

基　　金：国家重点研究发展计划项目(2019YFE0107200);襄阳市科技计划项目(2022ABH006229)。

摘　　要：以纳米Fe_(2)O_(3)和乙炔炭黑为原料,通过加入不同质量分数(25%,35%,45%,55%)的乙炔炭黑制备出了Fe_(2)O_(3)/C负极材料,研究了乙炔炭黑占比对Fe_(2)O_(3)/C负极材料的晶体结构、微观形貌及电化学性能的影响。结果表明,Fe_(2)O_(3)/C负极材料具有较高的结晶度,属于六方晶系结构,呈现出微球状颗粒,掺入适量的乙炔炭黑后改善了Fe_(2)O_(3)颗粒分布的均匀性,Fe_(2)O_(3)纳米颗粒被乙炔炭黑连接起来,形成了致密均匀的网格结构。以Fe_(2)O_(3)/C为负极材料制备了CR2025型纽扣电池,随着乙炔炭黑掺杂量的增大,Fe_(2)O_(3)/C负极材料的首次放电容量表现出先增大后降低的趋势,当乙炔炭黑的掺杂量为45%(质量分数)时,Fe_(2)O_(3)/C负极材料的首次放电容量达到最大值483.6 mAh/g。随着循环次数的增加,电池放电比容量衰减逐渐增大,放电过程中电压在0.15 V附近出现了较宽的放电平台,在达到30次充放电循环时,当乙炔炭黑的掺杂量为45%(质量分数)时,Fe_(2)O_(3)/C负极材料的放电比容量降低至115.6 mAh/g,保持率最高为23.91%,经过0.5,1.0,2.0和3.0 C的电流密度放电后,再将电流密度给定到0.5 C时,电池的放电容量变化较小,具有优异的倍率性能。Fe_(2)O_(3)/C negative electrode materials were prepared using nano Fe_(2)O_(3)and acetylene carbon black as raw materials by adding different mass fractions(25%,35%,45%,55%)of acetylene carbon black.The effect of acetylene carbon black ratio on the crystal structure,micromorphology and electrochemical performance of Fe_(2)O_(3)/C anode materials was studied.The results showed that the Fe_(2)O_(3)/C negative electrode material had a high crystallinity,belonged to a hexagonal crystal system structure,and presented microspheres like particles.Adding an appropriate amount of acetylene carbon black improved the uniformity of the distribution of Fe_(2)O_(3)particles.Fe_(2)O_(3)nanoparticles were connected by acetylene carbon black,forming a dense and uniform grid structure.The CR2025 button battery was prepared using Fe_(2)O_(3)/C as the negative electrode material.With the increase of the doping amount of acetylene carbon black,the first discharge capacity of Fe_(2)O_(3)/C negative electrode material showed a trend of first increasing and then decreasing.When the doping amount of acetylene carbon black was 45 wt%,the first discharge capacity of Fe_(2)O_(3)/C negative electrode material reached a maximum of 483.6 mAh/g.As the number of cycles increased,the specific discharge capacity attenuation of the battery gradually increased,and a wide discharge plateau appears around 0.15 V during the discharge process.When the doping amount of acetylene carbon black was 45 wt%,the specific discharge capacity of Fe_(2)O_(3)/C negative electrode material decreased to 115.6 mAh/g and the retention rate reached 23.91%at 30 charge/discharge cycles.After discharging at current densities of 0.5,1.0,2.0 and 3.0 C,and then setting the current density to 0.5 C,the discharge capacity of the battery had a small change and excellent rate capability.

关 键 词：Fe_(2)O_(3)/C 锂离子电池 负极材料 乙炔炭黑 电化学性能 

分 类 号：TM242[一般工业技术—材料科学与工程] TM912.9[电气工程—电工理论与新技术]