【摘 要】
:
锂离子电池已经广泛地应用于各种手提电子设备的能源,并有望成为电动车和新能源的储能装备.在锂离子电池负极材料方面,硅材料由于具有高的理论比容量( 4200 mAh/g),较低的充放电电压平台,丰富的储量等优点,成为了最有潜力的负极材料之一.但是,硅材料在充放电过程中产生巨大的体积变化(>300 %),导致活性材料的粉化和电极结构的破坏,造成快速的容量衰减,这严重地阻碍了硅材料在实际中的应用.[1]如
【机 构】
:
厦门大学化学化工学院,福建,厦门,361005 厦门大学能源学院,福建,厦门,361005
论文部分内容阅读
锂离子电池已经广泛地应用于各种手提电子设备的能源,并有望成为电动车和新能源的储能装备.在锂离子电池负极材料方面,硅材料由于具有高的理论比容量( 4200 mAh/g),较低的充放电电压平台,丰富的储量等优点,成为了最有潜力的负极材料之一.但是,硅材料在充放电过程中产生巨大的体积变化(>300 %),导致活性材料的粉化和电极结构的破坏,造成快速的容量衰减,这严重地阻碍了硅材料在实际中的应用.[1]如今,解决这一难题的方法主要是制备纳米结构的硅基材料,包括纳米颗粒、纳米线、纳米管等.纳米材料由于可以承受更大的应力,并且可以缩短锂离子和电子的传输距离,往往具有优异的电化学性能.本论文通过热解甲烷的方法在硅纳米颗粒表面包覆了一层碳纳米片制备出一种碳纳米片包覆的Si/C复合材料,显著地增大了材料的比表面积,取得了优异的大倍率循环性能,如图1.
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