Self-Assembly of Pulverized Nanoparticles: An Approach to Realize Large-Capacity, Long-Lasting, and Ultra-Fast-Chargeable Na-Ion Batteries

Abstract

The fabrication of battery anodes simultaneously exhibiting large capacity, fast charging capability, and high cyclic stability is challenging because these properties are mutually contrasting in nature. Here, we report a rational strategy to design anodes outperforming the current anodes by simultaneous provision of the above characteristics without utilizing nanomaterials and surface modifications. This is achieved by promoting spontaneous structural evolution of coarse Sn particles to 3Dnetworked nanostructures during battery cycling in an appropriate electrolyte. The anode steadily exhibits large capacity (∼480 mAhg −1 ) and energy retention capability (99.9%) during >1500 cycles even at an ultrafast charging rate of 12 690 mAg −1 (15C). The structural and chemical origins of the measured properties are explained using multiscale simulations combining molecular dynamics and density functional theory calculations. The developed method is simple, scalable, and expandable to other systems and provides an alternative robust route to obtain nanostructured anode materials in large quantities.

Electrochemical Activation, Sintering, and Reconstruction in Energy‐Storage Technologies: Origin, Development, and Prospects

“…SIBs/PIBs possess charge/discharge mechanisms similar to those of LIBs; [ 149–151 ] the electrode materials in SIBs/PIBs experience the same morphological variations during the energy‐storage process. For example, Song et al.…”

“…SIBs/PIBs possess charge/discharge mechanisms similar to those of LIBs; [149][150][151] the electrode materials in SIBs/PIBs experience the same morphological variations during the energy-storage process. For example, Song et al examined in detail the influence that the morphological evolution of a nanostructured Ni 3 S 2 /Ni anode has on the performance of SIBs (Figure 18a).…”

Dual Mechanism for Sodium based Energy Storage

“…Other anodes (3D carbon [ 53 ] and 3D tin (Sn) framework [ 54,55 ] ) have been constructed to verify whether they could operate under dual mechanism for Na storage. When using 3D carbon (Figure S24, Supporting Information), the dual mechanism cannot work well because the sluggish Na + transportation, thus leading to severe Na dendrites growth.…”

Self-assembling CuS anodes with conversion reaction for ultrafast Na-ion storage

“…19 The fragmented nanoparticles can coalesce in the presence of an appropriate electrolyte, but the propensity for coalescence differs depending on the type of electrolyte solvents. 16,17,20 To compare the effects of solvents on the coalescence behavior and investigate their impact on electrochemical properties, two types of Na–CuS half-cells were prepared using 1 M NaPF 6 electrolytes containing two different solvents: (1) a dimethoxyethane (DME) solvent, a representative and widely used ether solvent, and (2) a mixture of ethylene carbonate (EC) and diethyl carbonate (DEC) solvents (referred to as the EC/DEC solvent), which is a representative carbonate solvent commonly used in commercial Li batteries. Notably, the cell tests were performed after running the first cycle at 0.1C for electrical stabilization (Fig.…”