具有优异锂存储性能的蛋黄蛋壳结构FeS2@CFs薄膜电极

doi:10.11949/0438-1157.20210747

摘要/Abstract

摘要：

利用简单的静电纺丝结合刻蚀和硫化策略获得了FeS₂@碳纤维（FeS₂@CFs）薄膜电极，每个独特的蛋黄蛋壳结构单元与全方位三维碳纤维导电网络之间的协同效应赋予了电极材料优异的锂存储性能。作为锂离子电池负极材料时，在5 A·g^-1的大电流密度下容量仍能保持在415.4 mAh·g^-1，在0.5 A·g^-1的电流密度下经过循环400圈的循环之后可逆容量约为977.9 mAh·g^-1。更重要的是，前驱体材料具有很广泛的扩展性，这可为柔性薄膜电极材料的制备提供一种设计思路。

关键词: 锂离子电池, FeS₂@CFs, 蛋黄蛋壳结构, 纳米材料, 复合材料, 薄膜电极, 电化学

Abstract:

The FeS₂@carbon fibers (FeS₂@CFs) thin film electrodes were obtained using a simple electrospinning combined with etching and sulfidation strategy. The synergistic effect between each unique yolk-shell structural unit and the all-around three-dimensional carbon fiber conductive network endowed the electrode materials with excellent lithium storage performance. When used as anode material for lithium ion batteries (LIBs), the capacity can be maintained at 415.4 mAh·g^-1 at a high current density of 5 A·g^-1, and the reversible capacity is still retained at 977.9 mAh·g^-1 even after 400 cycles at a current density of 0.5 A·g^-1. More importantly, the precursor material has a wide range of scalability, which can provide a design idea for the preparation of flexible thin film electrode materials.

Key words: lithium ion batteries, FeS₂@CFs, yolk-shell structure, nanomaterials, composites, thin film electrodes, electrochemistry

中图分类号:

TQ 152

李海昌, 何燕, 孙洪冉, 徐常蒙, 李劢, 宋文明, 李慧芳, 王晓君, 刘治明. 具有优异锂存储性能的蛋黄蛋壳结构FeS₂@CFs薄膜电极[J]. 化工学报, 2021, 72(11): 5858-5866.

Haichang LI, Yan HE, Hongran SUN, Changmeng XU, Mai LI, Wenming SONG, Huifang LI, Xiaojun WANG, Zhiming LIU. Yolk-shell structural FeS₂@CFs thin film electrode with excellent lithium storage performance[J]. CIESC Journal, 2021, 72(11): 5858-5866.

图/表 7

图1 Fe2O3、Fe3O4@CFs、FeS2@CFs-0、FeS2@CFs-20、FeS2@CFs-40和FeS2@CFs-60的XRD光谱

Fig.1 XRD patterns of Fe2O3, Fe3O4@CFs, FeS2@CFs-0, FeS2@CFs-20, FeS2@CFs-40 and FeS2@CFs-60, respectively

图2 Fe2O3前驱体的SEM图(a)；FeS2@CFs-40的SEM图[(b)、(c)]；FeS2@CFs-0、FeS2@CFs-20和FeS2@CFs-60的SEM图[(d)~(f)]

Fig.2 SEM image of Fe2O3 precursor (a); SEM images of FeS2@CFs-40[ (b),(c)]; SEM images of FeS2@CFs-0, FeS2@CFs-20 and FeS2@CFs-60[(d)—(f)]

图3 FeS2@CFs-40的TEM图(a)； FeS2@CFs-40中Fe、S、N、C元素分布(b)

Fig.3 TEM image of FeS2@CFs-40 (a); Distribution of Fe,S,N,C elements in FeS2@CFs-40 (b)

图4 FeS2@CFs-40和FeS2@CFs-0的TGA曲线

Fig.4 TGA curves of FeS2@CFs-40 and FeS2@CFs-0

图5 FeS2@CFs-40的XPS全谱(a)及对应的Fe 2p(b)、S 2p(c)和N 1s(d)精细谱

Fig.5 XPS full spectrum of FeS2@CFs-40 (a) and corresponding fine spectra of Fe 2p (b), S 2p (c) and N 1s (d)

图6 FeS2@CFs-40在0.1 mV·s-1下的CV曲线(a)；FeS2@CFs-40在0.1 A·g-1的前四圈充放电曲线(b)；FeS2@CFs-40、FeS2@CFs-0的倍率性能(c)；FeS2@CFs-40、FeS2@CFs-0在0.5 A·g-1时的循环性能(d)；FeS2@CFs-0、FeS2@CFs-20、FeS2@CFs-40、FeS2@CFs-60在1 A·g-1时的循环性能(e)

Fig.6 CV curve of FeS2@CFs-40 at 0.1 mV·s-1 (a); FeS2@CFs-40 charge-discharge curve of the first four cycles at 0.1A·g-1 (b); Rate performance of FeS2@CFs-40 and FeS2@CFs-0 (c); Cycling performance of FeS2@CFs-40 and FeS2@CFs-0 at 0.5 A·g-1 (d); Cycling performance of FeS2@CFs-0, FeS2@CFs-20, FeS2@CFs-40 and FeS2@CFs-60 at 1 A·g-1, respectively (e)

表1 FeS2负极材料用于锂离子电池的性能比较

Table 1 Performance comparison of FeS2 anode materials for LIBs

材料类型	循环性能			倍率性能		参考文献
材料类型	电流密度/(A·g^-1)	圈数/n	比容量/(mAh·g^-1)	电流密度/(A·g^-1)	比容量/(mAh·g^-1)	参考文献
FeS₂@C/rGO	0.89	250	412	1.78	389	[12]
FeS₂@carbon fiber	0.2	300	280	0.2	275	[13]
FeS₂ microspheres	2	100	495	8	318	[14]
FeS₂/C	0.1	80	1100	2	866	[16]
GF/FeS₂@C	2	400	678.2	20	530	[17]
FeS₂@POC	2	200	590	5	381	[18]
FeS₂@CFs-40	1	500	590.8	5	415.4	本文

参考文献 34

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具有优异锂存储性能的蛋黄蛋壳结构FeS₂@CFs薄膜电极

Yolk-shell structural FeS₂@CFs thin film electrode with excellent lithium storage performance

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