<br>将 SnO2 纳米粒子与 MoS2 纳米片结合以实现高度可逆和循环稳定的锂/钠存储,Energy & Environmental Materials

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将 SnO2 纳米粒子与 MoS2 纳米片结合以实现高度可逆和循环稳定的锂/钠存储
Energy & Environmental Materials ( IF 13.0 ) Pub Date : 2023-12-10 , DOI: 10.1002/eem2.12682
Deliang Cheng _{1,

2} , Wenbiao Zhang ₃ , Yi Tang ₄ , Qingsheng Gao ₃ , Renzong Hu ₂ , Lichun Yang ₂ , Min Zhu ₂

Affiliation

SnO ₂ 具有理论容量高、资源丰富、环境友好等优点，被广泛认为是潜在的锂离子电池负极材料。然而，Sn纳米粒子的粗化阻碍了SnO ₂ 的再转化，导致库仑效率低和容量快速衰减。在这项研究中，我们通过等离子体辅助铣削将 SnO ₂ 纳米颗粒与 MoS ₂ 纳米片结合起来制造了异质结构。该异质结构由主要处于 1 T 相的原位剥离 MoS ₂ 纳米片组成，通过强键合紧密包裹 SnO ₂ 纳米颗粒。这种配置有效地减轻了循环时的体积变化和颗粒聚集。此外，MoS ₂ 的锂化产物Mo对Sn的强亲和力对于抑制Sn纳米晶的粗化起着关键作用，从而增强了Sn向SnO ₂ 骑车时。因此，SnO ₂ /MoS ₂ 异质结构作为锂离子电池负极材料表现出优异的性能，表现出高容量、快速倍率能力和更长的使用寿命。具体而言，以0.2 A g ⁻¹ 倍率充放电300次循环，实现了1173.4 mAh g ⁻¹ 的显着可逆容量。即使以1.0和5.0 A g ⁻¹ 的高倍率循环800次，它仍然分别保留了1005.3和768.8 mAh g ⁻¹ 的高可逆容量。此外，该异质结构在全锂离子电池和钠离子电池中都表现出出色的电化学性能。

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Binding SnO2 Nanoparticles with MoS2 Nanosheets Toward Highly Reversible and Cycle-Stable Lithium/Sodium Storage

SnO₂, with its high theoretical capacity, abundant resources, and environmental friendliness, is widely regarded as a potential anode material for lithium-ion batteries (LIBs). Nevertheless, the coarsening of the Sn nanoparticles impedes the reconversion back to SnO₂, resulting in low coulombic efficiency and rapid capacity decay. In this study, we fabricated a heterostructure by combining SnO₂ nanoparticles with MoS₂ nanosheets via plasma-assisted milling. The heterostructure consists of in-situ exfoliated MoS₂ nanosheets predominantly in 1 T phase, which tightly encase the SnO₂ nanoparticles through strong bonding. This configuration effectively mitigates the volume change and particle aggregation upon cycling. Moreover, the strong affinity of Mo, which is the lithiation product of MoS₂, toward Sn plays a pivotal role in inhibiting the coarsening of Sn nanograins, thus enhancing the reversibility of Sn to SnO₂ upon cycling. Consequently, the SnO₂/MoS₂ heterostructure exhibits superb performance as an anode material for LIBs, demonstrating high capacity, rapid rate capability, and extended lifespan. Specifically, discharged/charged at a rate of 0.2 A g⁻¹ for 300 cycles, it achieves a remarkable reversible capacity of 1173.4 mAh g⁻¹. Even cycled at high rates of 1.0 and 5.0 A g⁻¹ for 800 cycles, it still retains high reversible capacities of 1005.3 and 768.8 mAh g⁻¹, respectively. Moreover, the heterostructure exhibits outstanding electrochemical performance in both full LIBs and sodium-ion batteries.

更新日期：2023-12-10

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