Preparation, Characterization and Electrochemical Properties of Mesoporous Biomass Carbon Derived from Corn Stalk†

doi:10.7503/cjcu20170824

Abstract

Abstract:

Corn stalk was used as raw material to prepare mesoporous biomass carbon using CaCl₂ as activator. The mesoporous biomass carbon was characterized by means of X-ray diffraction(XRD), Raman spectroscopy, scanning electron microscopy(SEM), transmission electron microscopy(TEM) and N₂ adsorption-desorption analysis. The electrochemical properties of the mesoporous biomass carbon were analyzed and the formation mechanism of the mesoporous structure was explored. For the sample that calcined at 600 ℃, the specific surface area was 370.6 m²/g, the average pore size was 9.65 nm. When it was applied as the anode material of lithium ion battery, the discharge capacity of the sample was 783 mA·h/g at 0.2C rate after 100 cycles. Even at 10C rate, the electrode demonstrated an excellent high rate capability of 347 mA·h/g after 1000 cycles. The sample showed good rate performance and excellent cycle stability due to the large specific surface area, which can improve the permeability of electrolyte and increase the reactive sites. Moreover, the porous structure increased the free movement space for lithium ions and charges, which was conducive to the improvement of electrochemical performance.

Key words: Corn stalk, Mesoporous structure, Biomass carbon, Lithium ion battery

CLC Number:

O613.71

TrendMD:

LI Yi, LI Chun, YU Kaifeng. Preparation, Characterization and Electrochemical Properties of Mesoporous Biomass Carbon Derived from Corn Stalk^†[J]. Chem. J. Chinese Universities, 2018, 39(4): 607.

Figures/Tables 7

Fig.1 XRD patterns(A) and Raman spectra(B) of the CSC-500(a), CSC-600(b), and CSC-700(c) samples

Fig.2 SEM images of the CSC-500(A), CSC-600(B) and CSC-700(C) samples

Fig.3 TEM images of the CSC-500(A), CSC-600(B) and CSC-700(C) samples

Fig.4 Nitrogen adsorption-desorption isotherms(A) and pore size distributions(B) of the CSC-500, CSC-600 and CSC-700 samples

Fig.5 Formation mechanism of mesoporous biomass carbon derived from corn stalk

Fig.6 Cycling performance profiles at 0.2C(A), rate performance(B), cycling performance profiles at 10C(C) of the CSC-500, CSC-600 and CSC-700 samples

Fig.7 Cyclic voltammogram profile(A) and impedances(B) of CSC-600

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