Morphology-Controlled Discharge Profile and Reversible Cu Extrusion and Dissolution in Biomimetic CuS

Han, Shaobo1; Wang, Jing1; Shi, Xiaobo1; Guo, Mohan1; Wang, Hong1; Wang, Chongmin2; Gu, Meng1

2018-12-05

10.1021/acsami.8b17387

ACS Applied Materials & Interfaces   影响因子和分区

1944-8244

Metal sulfide materials such as CuS, SnS2, Co9S8, and MoS2 are high-capacity anode materials for Li-ion batteries with high capacity. However, these materials go through a conversion reaction with Li+, which is accompanied by inevitably huge volume expansions, thereby causing performance degradation. Here, we report a nanoscale engineering route to efficiently control the overall volume expansion for enhanced performance. We engineered CuS with nanoplate assembly on a nanostring, leading to a nanostructure mimicking the crassula baby necklace (CBN) in the natural plant. Using in situ transmission electron microscopy, we probed the lithiation kinetics and dynamic structural transformations. Due to the linkage of the central nanostring, the CuS CBN exhibited a fast Li+ diffusion along the axial direction and high mechanical stability during lithiation. The volume expansion was minimal for our CuS CBN due to the pre-engineered gap and pores between these plates. The CuS followed a two-step lithiation process, with Cu2S and Li2S formation as the first step and Cu extrusion in the later stage. Interestingly, during the Cu2S-to-Cu conversion, we observed an incubation period before the metallic Cu extrusion, which is featured by the formation of an amorphous structure due to the large lattice strain and distortion associated with the displacement of Cu by Li ions. In the final stage, the lithiated amorphous phase recrystallized to a composite of Cu nanocrystals in a polycrystalline Li2S matrix. Associated with the nanoscale size, the Cu nanocrystals can reversibly dissolve into the matrix upon delithiation. The present work demonstrates tailoring of desired functionality in electrodes using bionic engineering methods.

in situ TEM CuS battery lithiation EELS discharge profile

SCI ; EI

英语

第一 ; 通讯

Southern University of Science and Technology[Y01256127] ; Southern University of Science and Technology[G01256032]

Science & Technology - Other Topics ; Materials Science

Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary

WOS:000452694100055

AMER CHEMICAL SOC

20184906204348

Anodes ; Biomimetics ; Cobalt compounds ; Copper ; Electron energy loss spectroscopy ; Extrusion ; High resolution transmission electron microscopy ; In situ processing ; IV-VI semiconductors ; Layered semiconductors ; Lithium-ion batteries ; Mechanical stability ; Molybdenum compounds ; Nanocrystals ; Semiconducting tin compounds ; Sulfur compounds ; Tin compounds ; Transmission electron microscopy

Biotechnology:461.8 ; Copper:544.1 ; Compound Semiconducting Materials:712.1.2 ; Electron Tubes:714.1 ; Optical Devices and Systems:741.3 ; Nanotechnology:761 ; Materials Science:951

Web of Science

1.Southern Univ Sci & Technol, Dept Mat Sci & Engn, 1088 Xueyuan Blvd, Shenzhen 518055, Guangdong, Peoples R China
2.Pacific Northwest Natl Lab, Environm Mol Sci Lab, 902 Battelle Blvd, Richland, WA 99352 USA

Han, Shaobo,Wang, Jing,Shi, Xiaobo,et al. Morphology-Controlled Discharge Profile and Reversible Cu Extrusion and Dissolution in Biomimetic CuS[J]. ACS Applied Materials & Interfaces,2018,10(48):41458-41464.

Han, Shaobo.,Wang, Jing.,Shi, Xiaobo.,Guo, Mohan.,Wang, Hong.,...&Gu, Meng.(2018).Morphology-Controlled Discharge Profile and Reversible Cu Extrusion and Dissolution in Biomimetic CuS.ACS Applied Materials & Interfaces,10(48),41458-41464.

Han, Shaobo,et al."Morphology-Controlled Discharge Profile and Reversible Cu Extrusion and Dissolution in Biomimetic CuS".ACS Applied Materials & Interfaces 10.48(2018):41458-41464.