Improved cycling stability of NiS2 cathodes through designing a "kiwano" hollow structure

doi:10.1039/c8ta01551a

	Improved cycling stability of NiS2 cathodes through designing a "kiwano" hollow structure
	Zhang, Yaru 1; Lu, Fei 1; Pan, Lu 1; Xu, Yong 2; Yang, Yijun 1; Bando, Yoshio 2,3; Golberg, Dmitri 3,5; Yao, Jiannian 2,4; Wang, Xi 1,2
刊名	JOURNAL OF MATERIALS CHEMISTRY A
	2018-07-07
卷号	6 期号:25 页码:11978-11984
ISSN号	2050-7488
DOI	10.1039/c8ta01551a
英文摘要	As one of the promising cathode materials, NiS2 delivers an ultrahigh theoretical capacity of 870 mA h g(-1). However, it suffers from huge capacity fading during multiple cycles because of the close formation enthalpy between NiS2 and other nickel sulphides (Ni3S4, Ni3S2 and NiS) and the large volumetric expansion during charging. To overcome these drawbacks, and being inspired by the morphology of kiwano, i.e. the African horned melon, with many protrusions, we design and synthesize a unique kiwano-like hollow structure via a facile approach, which is beneficial to shorten the diffusion lengths, buffer the volume expansion and especially control the evolution of intermediate phases. The fabricated electrodes present significantly improved capacity (681 mA h g(-1) after 100 cycles at 50 mA g(-1)), superior cycling stability (580.6 mA h g(-1) even after 400 cycles at 0.2C) and fast Li+ storage properties (264 mA h g(-1) at 2C). The single intermediate phase Ni3S4, rather than other nickel sulphides, was observed in real time by using in situ transmission electron microscopy (TEM) upon direct lithiation. This was one of the key factors for the outstanding cycling stability. As visualized by in situ TEM, the pores in the kiwano structure can effectively buffer the volume expansion. In addition, Li+ ions prefer to insert into NiS2 through the (111) facet owing to their low activation energy. Density of states (DOS) calculations reveal that NiS2 and the intermediate phase Ni3S4 present extremely high electronic conductivity, thus delivering high rate capacity. These promising findings can provide a new perspective in high-performance lithium-ion batteries.
语种	英语
出版者	ROYAL SOC CHEMISTRY
WOS记录号	WOS:000436516700040
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/41936]
专题	化学研究所_光化学实验室
通讯作者	Wang, Xi
作者单位	1.Beijing Jiaotong Univ, Sch Sci, Dept Phys, Key Lab Luminescence & Opt Informat,Minist Educ, Beijing 100044, Peoples R China 2.Tianjin Univ, Collaborat Innovat Ctr Chem Sci & Engn Tianjin, Sch Chem Engn & Technol,Inst Mol Plus, Tianjin Key Lab Mol Optoelect Sci,Dept Chem, Tianjin 300072, Peoples R China 3.NIMS, Int Ctr Mat Nanoarchitecton MANA, ICYS, Namiki 1-1, Tsukuba, Ibaraki 3050044, Japan 4.Chinese Acad Sci, Inst Chem, Key Lab Photochem, Beijing 100190, Peoples R China 5.QUT, Sci & Engn Fac, 2 George St, Brisbane, Qld 4000, Australia
推荐引用方式 GB/T 7714	Zhang, Yaru,Lu, Fei,Pan, Lu,et al. Improved cycling stability of NiS2 cathodes through designing a "kiwano" hollow structure[J]. JOURNAL OF MATERIALS CHEMISTRY A,2018,6(25):11978-11984.
APA	Zhang, Yaru.,Lu, Fei.,Pan, Lu.,Xu, Yong.,Yang, Yijun.,...&Wang, Xi.(2018).Improved cycling stability of NiS2 cathodes through designing a "kiwano" hollow structure.JOURNAL OF MATERIALS CHEMISTRY A,6(25),11978-11984.
MLA	Zhang, Yaru,et al."Improved cycling stability of NiS2 cathodes through designing a "kiwano" hollow structure".JOURNAL OF MATERIALS CHEMISTRY A 6.25(2018):11978-11984.