Ge nanocrystals tightly and uniformly distributed in a carbon matrix through nitrogen and oxygen bridging bonds for fast-charging high-energy-density lithium-ion batteries

Li, Jiayang; Li, Zhenwei; Han, Meisheng

doi:10.1039/d1ma00021g

Cited by 4 publications

(1 citation statement)

References 35 publications

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“…Moreover, its advancement in fast-charging LIBs has also been delayed owing to its low theoretical capacity [ 3 ]. To explore alternatives to graphite, high-performance anode materials such as metals [ 4 ], transition metal dichalcogenides (MoS 2 , etc.) [ 5 – 9 ], transition metal oxides [ 10 ], metal selenides (In 2 Se 3 , etc.)…”

Section: Introductionmentioning

confidence: 99%

Monolayer MoS2 Fabricated by In Situ Construction of Interlayer Electrostatic Repulsion Enables Ultrafast Ion Transport in Lithium-Ion Batteries

Han

Guo

et al. 2023

Nano-Micro Lett.

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Highlights In-situ construction of electrostatic repulsion between MoS 2 interlayers is first proposed to successfully prepare Co-doped monolayer MoS 2 under high vapor pressure. The doped Co atoms radically decrease bandgap and lithium ion diffusion energy barrier of monolayer MoS 2 and can be transformed into ultrasmall Co nanoparticles (~2 nm) to induce strong surface-capacitance effect during conversion reaction. The Co doped monolayer MoS 2 shows ultrafast ion transport capability along with ultrahigh capacity and outstanding cycling stability as lithium-ion-battery anodes. Abstract High theoretical capacity and unique layered structures make MoS 2 a promising lithium-ion battery anode material. However, the anisotropic ion transport in layered structures and the poor intrinsic conductivity of MoS 2 lead to unacceptable ion transport capability. Here, we propose in-situ construction of interlayer electrostatic repulsion caused by Co 2 + substituting Mo 4+ between MoS 2 layers, which can break the limitation of interlayer van der Waals forces to fabricate monolayer MoS 2 , thus establishing isotropic ion transport paths. Simultaneously, the doped Co atoms change the electronic structure of monolayer MoS 2 , thus improving its intrinsic conductivity. Importantly, the doped Co atoms can be converted into Co nanoparticles to create a space charge region to accelerate ion transport. Hence, the Co-doped monolayer MoS 2 shows ultrafast lithium ion transport capability in half/full cells. This work presents a novel route for the preparation of monolayer MoS 2 and demonstrates its potential for application in fast-charging lithium-ion batteries. Supplementary Information The online version contains supplementary material available at 10.1007/s40820-023-01042-4.

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Section: Introductionmentioning

confidence: 99%

Monolayer MoS2 Fabricated by In Situ Construction of Interlayer Electrostatic Repulsion Enables Ultrafast Ion Transport in Lithium-Ion Batteries

Han

Guo

et al. 2023

Nano-Micro Lett.

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Pressure‐Induced Dense and Robust Ge Architecture for Superior Volumetric Lithium Storage

Han,

Liu,

Zheng

et al. 2024

Advanced Energy Materials

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The germanium (Ge) anode attains wide attention in lithium‐ion batteries because of its high theoretical volumetric capacity (8646 mAh cm−3). However, the huge volume expansion (≈230%) results in its poor electrochemical performances. The strategies reported in the literature to solve the issue often cause a low packing density, lowering the volumetric capacity. Here, a pressure‐induced route is proposed to fabricate a Ge architecture, in which nano‐sized Ge (≈15 nm) is encapsulated by robust TiO2 and highly conductive carbon, which offer the advantages of a low stress–strain characteristic, low volume expansion in thickness change, high electrical conductivity (463.2 S m−1), high Li‐ion diffusion coefficient (9.55 × 10−9–8.51 × 10−12 cm2 s−1), and high tapping density (1.79 g cm−3). As a result, the dense architecture obtains outstanding volumetric capacities of 3559.8 mAh cm−3 at 0.1 A g−1 and 2628.2 mAh cm−3 at 20 A g−1, along with excellent cycling life over 5000 cycles at 10 A g−1. Remarkably, the full cell achieves a high volumetric energy density of 1760.1 Wh L−1, along with impressive fast‐charging performances and long cycling life. This work provides a new synthesis strategy and deep insight into the design of high‐volumetric capacity alloy‐based lithium‐ion‐battery anodes.

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Surface modification of electrospun nitrogen-doped Ge@C fiber with highly porous NiCo2O4 layer as high-performance lithium-ion battery anode

Verdianto,

Jung,

Kim

2024

Materials Today Advances

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Ge nanocrystals tightly and uniformly distributed in a carbon matrix through nitrogen and oxygen bridging bonds for fast-charging high-energy-density lithium-ion batteries

Abstract: Ge has come to public interest as high-capacity and high-rate lithium-ion battery anode. However, unsatisfactory cycling life is caused due to its large volume expansion (~230%) upon cycling. In order...

Cited by 4 publications

References 35 publications

Monolayer MoS2 Fabricated by In Situ Construction of Interlayer Electrostatic Repulsion Enables Ultrafast Ion Transport in Lithium-Ion Batteries

Monolayer MoS2 Fabricated by In Situ Construction of Interlayer Electrostatic Repulsion Enables Ultrafast Ion Transport in Lithium-Ion Batteries

Pressure‐Induced Dense and Robust Ge Architecture for Superior Volumetric Lithium Storage

Surface modification of electrospun nitrogen-doped Ge@C fiber with highly porous NiCo2O4 layer as high-performance lithium-ion battery anode

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