Ge Nanoparticles in MXene Sheets: One-step Synthesis and Highly Improved Electrochemical Property in Lithium-ion Batteries

doi:10.15541/jim20190161

Abstract

Abstract:

Ge nanoparticles were synthesized uniformly on MXene sheets via a one-step chemical solution method. Morphology of Ge/MXene was characterized by SEM and TEM. Formation process and optimized synthesis condition was analyzed carefully. Ge/MXene was used as anode for lithium-ion batteries. Their electrochemical performances, including capacity, rate and cycling stability, were tested and evaluated. Ge/MXene exhibited a greatly improved capacity of 1200 mAh/g during the first hundred cycles at 0.2C with a loading of 1 mg/cm ². A capacity of 450 mAh/g at a higher loading of 2 mg/cm ² was obtained after 100 cycles. The excellence in electrochemistry is attributed to the high conductivity of MXene and its accommodable interlayer space.

Key words: MXene, Ge nanoparticles, lithium-ion batteries, anode materials

CLC Number:

TQ174

GUO Si-Lin, KANG Shuai, LU Wen-Qiang. Ge Nanoparticles in MXene Sheets: One-step Synthesis and Highly Improved Electrochemical Property in Lithium-ion Batteries[J]. Journal of Inorganic Materials, 2020, 35(1): 105-111.

Figures/Tables 7

Fig. 1 XRD patterns of MAX (black), MXene (red) and Ge/MXene (blue)

Fig. 2 SEM images of Ge/MXene

Fig. 3 Morphology with analysis of Ge/MXene (a-c) TEM image of Ge/MXene; (b) Low magnification TEM image, the arrows points to typical MXene layers; (c) High magnification TEM image and thin carbon layer around Ge nanoparticle; (d) HADDF image of Ge/MXene; EDS mappings of (e) C, (f) Ti and (g) Ge

Fig. 4 XRD patterns (a) of Ge/MXene with different annealing time and their TEM images (b-c) 0.5 h; (d-e) 1.5 h; (f) 3 h. Peaks marked with solid circles are from MXene and with cross are from Ge

Fig. 5 (a) Charge-discharge curves of Ge/MXene at different rate; (b) Rate performance, (c) EIS curves, and cycling performance of Ge/MXene with different Ge content ((d) 50wt% and (e) 75wt%)

Fig. 6 Cycling performance of Ge/MXene with different loadings

Fig. 7 Cycling performance of Ge/MXene with different annealing time

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