[논문]Exploring the Properties and Potential of Single-crystal NCM 811 for Lithium-ion Batteries

Seunghoon Nam; Yongseok Lee

doi:10.14773/cst.2023.22.1.36

Exploring the Properties and Potential of Single-crystal NCM 811 for Lithium-ion Batteries 원문보기

Corrosion science and technology, v.22 no.1, 2023년, pp.36 - 43

Seunghoon Nam (Department of Materials Science and Engineering, College of Engineering, Andong National University) , Yongseok Lee (Department of Materials Science and Engineering, College of Engineering, Andong National University)

Abstract ▼ AI-Helper

Single-crystal Ni-rich NCM is a material that has drawn attention in the field of lithium-ion batteries due to its high energy density and long cycle life. In this study, we investigated the properties of single-crystal NCM 811 and its potential for use in lithium-ion batteries. High-quality single crystals of NCM 811 were successfully synthesized by crystal growth via a flux method. The single-crystal nature of the samples was confirmed through detailed characterization techniques, such as scanning electron microscopy and x-ray diffraction with Rietveld refinement. The crystal structure and electrochemical performances of the single-crystal NCM 811 were analyzed and compared to its poly-crystal counterpart. The results indicated that single-crystal NCM 811 had electrochemical performance and thermal stability superior to poly-crystalline NCM 811, making it a suitable candidate for high-performance batteries. The findings of this study contribute to a better understanding of the characteristics and potential of single-crystal NCM 811 for lithium-ion batteries.

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표/그림 (7)

그림 Fig. 1. An illustration of the synthetic procedures for s- and p-NCM particles. The initial NCM precursors are produced by coprecipitation reaction in a CSTR to guarantee homogenous elemental distribution of transition metals. Both s- and p-NCM are rendered by the addition of LiOH as a Li source, while Na₂SO₄, as a molten salt, are included only to the synthesis of s- NCM
$Fig. 2. X-ray diffraction of (a) Ni0.8Co0.1Mn0.1(OH)2. Ideal peak positions and intensities are indicated for β-Ni(OH)2 (JCPDS #14-0117). (b) X-ray diffractions of s-NCM (single-crystal LiNi0.8Co0.1Mn0.1O2) and p-NCM (poly-crystal LiNi0.8Co0.1Mn0.1O2). Ideal peak positions and intensities are indicated for LiNiO2 (JCPDS #09-0063). (c) Rietveld refinement of the diffraction of s- NCM$ 그림 Fig. 2. X-ray diffraction of (a) Ni_0.8Co_0.1Mn0.1(OH)₂. Ideal peak positions and intensities are indicated for β-Ni(OH)₂ (JCPDS #14-0117). (b) X-ray diffractions of s-NCM (single-crystal LiNi_0.8Co_0.1Mn_0.1O₂) and p-NCM (poly-crystal LiNi_0.8Co_0.1Mn_0.1O₂). Ideal peak positions and intensities are indicated for LiNiO₂ (JCPDS #09-0063). (c) Rietveld refinement of the diffraction of s- NCM
그림 Fig. 3. A SEM image of (a) NCM precursor (Ni0.8Co_0.1Mn_0.1(OH)₂). SEM images of (b), (c) p-NCM (poly-crystal LiNi_0.8Co_0.1Mn_0.1O₂) and (d), (e), (f) s-NCM (single-crystal LiNi_0.8Co_0.1Mn_0.1O₂)
그림 Fig. 4. EPMA result of a sliced s-NCM (single-crystal LiNi_0.8Co_0.1Mn_0.1O₂) particle by focused-ion beam (FIB) with elemental mapping of Ni, Mn, and Co, respectively. The position (distance) is indicated by an arrow in the figure
$Table 1. Details from Rietveld refinement from powder xray diffraction of s-NCM$ 표 Table 1. Details from Rietveld refinement from powder xray diffraction of s-NCM
그림 Fig. 5. (a) A dQ/dV curve of the s-NCM electrode at 0.5 C (1 C = 200 mAh/g). The peaks, indicative of various phase transitions, are marked in the figure. Galvanostatic charge/discharge profiles of (b) the p-NCM (poly-crystal LiNi_0.8Co_0.1Mn_0.1O₂) and (c) the s-NCM (single-crystal LiNi_0.8Co_0.1Mn_0.1O₂) at 0.5 C. Cycle-life performances of the s-NCM and p-NCM at the same C-rate. Note that the formation cycles are excluded
표 Table 2. The results of ICP analysis of the NCM precursor and s-NCM

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