一种高线能量密度的纤维状锂离子电池  

Fiber-shaped lithium ion battery with high linear energy density

作　　者：陈扬 吕鹏[1] CHEN Yang;LV Peng(College of Electronic and Optical Engineering,College of Flexible Electronics(Future Technology),Nanjing University of Posts and Telecommunications,Nanjing Jiangsu 210000,China)

机构地区：[1]南京邮电大学电子与光学工程学院、柔性电子(未来技术)学院,江苏南京210000

出　　处：《电源技术》2024年第9期1704-1712,共9页Chinese Journal of Power Sources

摘　　要：纤维状锂离子电池作为柔性电子设备的核心储能元件,表现出高灵活性、轻量化、可编织的优点。传统工艺制备的电极材料通常采用金属集流体涂覆活性物质的形式,在多种形变下容易造成活性物质龟裂、脱落等现象,影响储能性能的稳定。碳纤维(CF)具有电导率高、柔性好、机械性能强、可编织等优点,将其作为电极的导电骨架应用于柔性自支撑电极受到了广泛的关注。而碳纳米管(CNT)是常用在电极领域并具有大长径比、大比表面积的导电纳米材料,阵列碳纳米管(VACNTs)还能够提供高度有序的传导结构以及提高电极的机械强度。通过在CF上原位生长VACNTs作为柔性自支撑导电骨架,水热负载磷酸铁锂、钛酸锂分别作为正极、负极,组装成纤维全电池。在0.2 C的充放电倍率下,初始放电线比容量达到1.38 mAh/cm,线能量密度高达2.62 mWh/cm。As the core energy storage component of flexible electronic devices,fiber shaped lithium ion batteries show the advantages of high flexibility,light weight and weaving.The electrode materials prepared by the traditional process usually use the metal current collector to coat the active material,which is easy to cause the active material to crack and fall off under various deformations.This method affects the stability of the energy storage performance.Carbon fiber(CF)has the advantages of high conductivity,good flexibility,strong mechanical properties,and weaving.It has received extensive attention as a conductive skeleton for flexible self-supporting electrodes.Carbon nanotubes(CNT)are conductive nanomaterials commonly used in the field of electrodes with large aspect ratio and large specific surface area.Arrayed carbon nanotubes(VACNTs)can also provide a highly ordered conductive structure and improve the mechanical strength of the electrode.Herein,VACNTs were grown in situ on CF as a flexible self-supporting conductive skeleton,and hydrothermally loaded lithium iron phosphate and lithium titanate as positive and negative electrodes respectively,and assembled into a fiber full battery.At a charge-discharge rate of 0.2 C,the initial discharge line specific capacity reaches 1.38 mAh/cm,and the line energy density is as high as 2.62 mWh/cm.

关 键 词：碳纤维 碳纳米管 纤维状 锂离子电池 

分 类 号：TM912[电气工程—电力电子与电力传动]