Ultrathin Si Nanosheets Dispersed in Graphene Matrix Enable Stable Interface and High Rate Capability of Anode for Lithium-ion Batteries,Advanced Functional Materials

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Ultrathin Si Nanosheets Dispersed in Graphene Matrix Enable Stable Interface and High Rate Capability of Anode for Lithium-ion Batteries
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2022-01-07 , DOI: 10.1002/adfm.202110046
Yang Ren ₁ , Lizhi Xiang ₁ , Xucai Yin ₁ , Rang Xiao ₁ , Pengjian Zuo ₁ , Yunzhi Gao ₁ , Geping Yin ₁ , Chunyu Du _{1,

2}

Affiliation

Owing to the thinness and large lateral size, 2D Si materials exhibit very promising prospects as the high-performance anodes of lithium-ion batteries (LIBs). However, the facile synthesis of ultrathin 2D Si nanosheets (Si-NSs) and their efficient application still remain a great challenge. Herein, the fabrication of ultrathin Si-NSs with the average thickness of <2 nm is demonstrated using a unique etching-reduction protocol. After hybridizing with graphene, the as-prepared Si-NSs@rGO material delivers ultrahigh rate capability (2395.8 mAh g⁻¹ at 0.05 A g⁻¹ and 1727.3 mAh g⁻¹ at 10 A g⁻¹), long cycling lifespan (1000 cycles at 2 A g⁻¹ with a capacity decay rate of 0.05% per cycle) and high average Coulombic efficiency (99.85% during 1000 cycles). The superior performance is attributed to the ultrathinness of Si-NSs that greatly improves the diffusivity and reversibility of Li⁺ ions. This work provides a strategy for fabricating a high-rate-capability anode material to meet the growing demand for high power density LIBs.

中文翻译：

分散在石墨烯基体中的超薄硅纳米片为锂离子电池提供稳定的界面和高倍率性能

由于薄且横向尺寸大，二维硅材料作为锂离子电池（LIB）的高性能负极具有非常广阔的前景。然而，超薄二维硅纳米片（Si-NSs）的简便合成及其有效应用仍然是一个巨大的挑战。在这里，使用独特的蚀刻减少协议证明了平均厚度< 2 nm 的超薄 Si-NSs 的制造。与石墨烯杂化后，所制备的 Si-NSs@rGO 材料具有超高倍率性能（0.05 A g ^-1时为2395.8 mAh g ^-1和 10 A g ^{-1时为 1727.3 mAh g}^-1），循环寿命长（1000在 2 A g ^-1下循环每个循环的容量衰减率为 0.05%）和高平均库仑效率（1000 次循环期间为 99.85%）。优异的性能归因于 Si-NS 的超薄性，极大地提高了 Li ⁺离子的扩散性和可逆性。这项工作提供了一种制造高倍率负极材料的策略，以满足对高功率密度锂离子电池不断增长的需求。

更新日期：2022-01-07

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