Construction and Electrochemical Properties of Si/rGO@CN as Anode Materials for High-performance Lithium-ion Batteries

doi:10.7503/cjcu20230354

Abstract

Abstract:

In this paper， the self-charged graphene and the nano-silicon modified with positive charge were self- assembled by electrostatic self-assembly method， and then the dopamine bonding characteristics was used to nitrogen-doped carbon coating of the composite material to obtain Si/rGO@CN composites， and the effect of different thicknesses of nitrogen-doped carbon layers on the electrochemical performance of the composite materials was studied by changing the concentration and polymerization time of dopamine. The electrochemical results showed that when the content of nitrogen-doped carbon was 23.6%（mass fraction）， the composite showed excellent electro- chemical performance. The capacity of the composite was 943.4 mA·h/g after 200 cycles at a current density of 0.2 A/g， and its capacity remained at 753.8 mA·h/g after 300 cycles in the long cycle performance test at a current density of 1.0 A/g. The uniform continuous coating of the nitrogen-doped carbon layer can not only avoid the direct contact between silicon and electrolyte， but also buffer the volume expansion generated by silicon nanomaterials during lithium intercalation and maintain the stability of the material structure. The presence of graphene improves the conductivity of composite materials.

Key words: Lithium-ion battery, Anode material, Silicon-carbon composite, Nanosilicon, Carbon coating

CLC Number:

O646

TrendMD:

ZHOU Hui, ZHU Shuaibo, WANG Jitong, QIAO Wenming, YU Zijian, ZHANG Yinxu. Construction and Electrochemical Properties of Si/rGO@CN as Anode Materials for High-performance Lithium-ion Batteries[J]. Chem. J. Chinese Universities, 2023, 44(11): 20230354.

Figures/Tables 13

References 23

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Sample	S_BET^a /（m²·g^-1）	V_total^b /（cm³·g^-1）
Si/rGO	92.9	0.20
Si/rGO@CN⁃1	54.3	0.12
Si/rGO@CN⁃2	52.6	0.12
Si/rGO@CN⁃3	48.3	0.10

Sample	S_BET^a /（m²·g^-1）	V_total^b /（cm³·g^-1）
Si/rGO	92.9	0.20
Si/rGO@CN⁃1	54.3	0.12
Si/rGO@CN⁃2	52.6	0.12
Si/rGO@CN⁃3	48.3	0.10

Sample	R_s/Ω	R_ct/Ω	10⁵Q_dl	n	W⁃R	W⁃T	W⁃P
Si/rGO@CN⁃1	7.5	159	2.979	0.73	1.08	5.57×10^-4	0.38
Si/rGO@CN⁃2	2.7	90	2.196	0.75	2.91	2.43×10^-3	0.41
Si/rGO@CN⁃3	13.6	206	5.168	0.68	9.35	8.09×10^-3	0.37

Sample	R_s/Ω	R_ct/Ω	10⁵Q_dl	n	W⁃R	W⁃T	W⁃P
Si/rGO@CN⁃1	7.5	159	2.979	0.73	1.08	5.57×10^-4	0.38
Si/rGO@CN⁃2	2.7	90	2.196	0.75	2.91	2.43×10^-3	0.41
Si/rGO@CN⁃3	13.6	206	5.168	0.68	9.35	8.09×10^-3	0.37

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