Synthesis and Property of Novel Li21Si5/Graphene Composites Anode for High Energy Lithium-ion Batteries

doi:10.15541/jim20180097

Abstract

Abstract:

Taking advantage of simultaneous thermochemical lithiation and densification of spark plasma sintering, the Li₂₁Si₅/graphene nanocomposites with uniform distribution and high density were prepared. Due to the two-dimensional structure and excellent electrical conductivity of graphene, and the presence of a high proportion of tightly bonded interfaces of Li₂₁Si₅/graphene, the volume shrinkage of the active particles during the delithiation process was limited effectively, and the charge transport inside the active particles was enhanced dramatically. Therefore, the composite exhibits excellent electrochemical performance. The specific capacities of pre-delithiation and the first lithiation were 968 mAh∙g^-1 and 1007 mAh∙g^-1, respectively, which are 3 times as high as those of the commercial lithium-carbon compound. Its first Coulomb efficiency was 94.5% at the same time. Moreover, the specific capacity remained 590 mAh∙g^-1 after 100 cycles, and the cyclic stability doubled compared to the composites prepared by carbon particles. Even at a high current density of 1 A∙g^-1, the specific capacity can be maintained at 540 mAh∙g^-1. This work provides a new approach for the development of lithium-rich alloy anode materials, which are promising in high energy density batteries, such as lithium ion-sulfur and lithium ion-oxygen systems.

Key words: lithiation, anode, graphene, nanocomposite, lithium-ion batteries

CLC Number:

TQ152

YANG Ke, HOU Chao, SONG Xiao-Yan. Synthesis and Property of Novel Li₂₁Si₅/Graphene Composites Anode for High Energy Lithium-ion Batteries[J]. Journal of Inorganic Materials, 2018, 33(10): 1065-1069.

Figures/Tables 7

Fig. 1 XRD patterns of Li21Si5, Li21Si5@AB and Li21Si5@rGP

Fig. 2 SEM (a) and TEM (b) images of Si+rGP

Fig. 3 Charge/discharge curves of Li21Si5@rGP electrode wnder the test condition of pre-delithiation

Fig. 4 Cycling performances and Coulombic efficiencies of Li21Si5, Li21Si5@AB and Li21Si5@rGP electrodes

Fig. 5 SEM image of Li21Si5@rGP electrode at delithiation state after 100 circles (a), and Nyquist plots of Li21Si5@rGP electrode at delithiation state after different cycles and the comparison with Li21Si5@AB electrode after the first cycles (b)

Fig. 6 Comparison of rate performance and Coulombic efficiency of Li21Si5@AB and Li21Si5@rGP electrodes

Fig. 7 CV curves of Li21Si5@rGP (a) and Li21Si5@AB (b) electrodes

References 22

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Synthesis and Property of Novel Li₂₁Si₅/Graphene Composites Anode for High Energy Lithium-ion Batteries

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