Novel silicon/copper nanowires as high-performance anodes for lithium ion batteries

Germanium (Ge) has great advantages as a cathode material for lithium-ion batteries, but its application in the anode of lithium-ion batteries is limited by its volume expansion and poor electrical conductivity. Currently, nano-Ge and composite Ge are the main research directions. Using Ge/copper (Cu) alloy as raw material, herein, pulse discharge and chemical etching method are adopted to prepare a kind of Ge/Cu composite porous microsphere (Ge/Cu@PMS). A 3D conductive network structure is obtained to increase the conductivity of Ge and alleviate the volume expansion of lithium-ion battery during charge and discharge. As an anode material for Li-ion batteries, Ge/Cu@PMS has a capacity retention rate reaching 590 mAh g À1 after 200 constant current charge-discharge cycles at a current density of 800 mA g À1 , with a capacity retention rate of 79.1%. Therefore, Ge/Cu@PMS has great potential application in lithium energy storage-related technologies due to its excellent energy-storage performance and ease of preparation.

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“…The centrifuge tube was placed in a drying oven for 8 h, and the dried powder was collected to obtain the preliminary Ge/Cu@MS precursor. [ 28 ]…”

Section: Methodsmentioning

confidence: 99%

“…The centrifuge tube was placed in a drying oven for 8 h, and the dried powder was collected to obtain the preliminary Ge/Cu@MS precursor. [28] 3.1.2. Preparation of Ge/Cu@PMS We set the thermostatic hot plate to 25 °C and collected 10 mL of H 2 O 2 solution with 5% concentration in a measuring cylinder.…”

Section: Sample Preparationmentioning

confidence: 99%

Controllable Preparation of Ge/Cu Composite Porous Microspheres as High‐Performance Anode Materials for Lithium‐Ion Batteries

Liangdong

Hongrui

Liu

et al. 2023

Physica Status Solidi (a)

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“…[12] Thanks to the conductive copper network and nanowire structure, Juan Hong et al improved the design of Si-Cu alloy, Si/Cu nanowires, with high discharge capacity and high capacity after several cycles. [13] There are also some doping of transition metals that can serve the purpose. Zizhong Chen doped Zn into the three-dimensional dendritic Si structure by chemical alloying method under mild conditions to make nanoscale porous materials of different proportions, which can provide enough space and a solid skeleton to relax the structural changes, which is conducive to relaxing the mechanical stress of Si, reducing its capacity degradation and ensuring sufficient electrode-electrolyte contact.…”

Section: Provides Voids To Accommodate Si Volume Changesmentioning

confidence: 99%

Research progress in nanotechnology for enhanced silicon-based and iron-based anodes for lithium-ion batteries

Yao

2023

MATEC Web Conf.

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Recent research has focused on making suitable anode materials for lithium-ion batteries and using nanotechnology to refine composite electrode materials with high reversible capacity and strong stability. However, much work remains to be done to develop these materials into commercially viable solutions. The anode materials must have high reversible capacity, a long lifetime, and the ability to accept and release lithium ions repeatedly. Nano-engineered composite anode materials based on silicon and iron have shown good promise but need improved electrochemical properties and longer effective lifetimes. This paper summarizes the performance characteristics of Si-based and Fe-based anodes and ways to improve their performance through nanoengineering.

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“…Notably, it is approved that the Si anode places more stringent requirements on the binder and the effective binder correspondingly will also boost the high-performance realization of the silicon materials. − Employing high-performance binders is regarded as one of the most effective means to solve a series of problems caused by volume expansion of silicon electrodes. − The primary role of the binder is to bind the active material, conductive agent, and current collector together ensuring that these components are tightly bonded during cycling. − Polyimide (PI), which is a polymer containing imide groups on the main chain, has been accredited as an accessible binder for stabilizing silicon anodes because of its stable chemical properties, excellent mechanical properties, and controllability. , Kim et al prepared a silicon electrode using polyimide as the binder and compared the electrochemical properties with that using PVDF. The results displayed that the stability and physical stress recovery ability of PI binder improved significantly compared with PVDF.…”

Section: Introductionmentioning

confidence: 99%

Carboxyl Function Group Introduced to Polyimide Binders for Silicon Anode Materials

Zhang

et al. 2023

Energy Fuels

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Silicon has been considered as one of the most promising candidate anode material for Li-ion batteries due to its high theoretical specific capacity. Nevertheless, its low cycling performance due to the huge volume change during cycling hinders the commercial application of silicon anodes. Binders play a crucial role in Li-ion batteries and can effectively relieve the volumetric expansion stress of silicon anodes. Herein, we developed a polyimide binder with an introduced carboxyl group (PI-COOH). The introduced −COOH group can effectively bond with the oxide layer on the silicon surface through forming improved interface stability and then reducing the damage of the solid electrolyte interface film during cycling. Combined with the excellent intrinsic mechanical and thermodynamic properties of polyimide, the as-prepared PI-COOH binder significantly improved the cycling stability and rate performance of silicon anode.

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Novel silicon/copper nanowires as high-performance anodes for lithium ion batteries

Cited by 11 publications

References 36 publications

Controllable Preparation of Ge/Cu Composite Porous Microspheres as High‐Performance Anode Materials for Lithium‐Ion Batteries

Controllable Preparation of Ge/Cu Composite Porous Microspheres as High‐Performance Anode Materials for Lithium‐Ion Batteries

Research progress in nanotechnology for enhanced silicon-based and iron-based anodes for lithium-ion batteries

Carboxyl Function Group Introduced to Polyimide Binders for Silicon Anode Materials

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