The porous spongy nest structure compressible anode fabricated by gas forming technique toward high performance lithium ions batteries

• Published in: Journal of colloid and interface science 2022-10, Vol.623, p.584-594
• Main Authors: Wang, Xuhui, Sun, Na, Dong, Xufeng, Huang, Hao, Qi, Min
• Format: Article
• Language: English
• Subjects: Compressible anode; Electrospinning; Gas-forming; Lithium ions batteries; Spongy carbon nanofibers
• ISSN: 0021-9797; 1095-7103
• DOI: 10.1016/j.jcis.2022.05.067

This work is innovative based on the construction of compressible nest-like spongy CNFs composite electrode to improve performance of flexible LIBs. Novelty gas-forming technique and efficient electrospinning fabricate unique macro sponge-like structure. It endows excellent electrochemical performance under compress state and superior compressible as well as recovery ability. The anode exhibits fast permeability and various pores morphology, and nest-like structure effectively relieve stress from expansion of particles in CNFs. Thus, the compressible spongy anode possesses long cycling life under deformation which could be hopefully applied in Flexible batteries. [Display omitted] •Spongy CNFs structure is available for compressible self-standing anode.•Spongy porous benefit electrolyte infiltration and ions diffusion.•The anodes exhibit compress recovery properties and excellent cycling ability. The state-of-the-art electronics promote the development of flexible and deformable batteries, which rely on design of advanced structure batteries and fabrication of suitable electrode materials. The current flexible electronics are generally limited by rigidity and nondeformable electrodes. Herein, this work reports an exceeding compressible spongy carbon nanofibers composite anode which was fabricated by electrospinning and gas-forming techniques. The abundant macro/micro porous and loss structure of spongy layers enable the composite electrode exhibited compressible capability and faster ions infiltration ability. And the nest morphology of spongy carbon nanofibers network promised stable conductivity and superior cycling performance of self-standing anodes. The compressible SnO2@spongy carbon nanofibers and SiO2@spongy carbon nanofibers self-standing anode exhibited outstanding cycling ability before 300 cycles under compressed state, with a capacity of 350 and 398 mA h g−1, respectively. Notably, the stress and strain of compressible spongy composite electrode are 370 kPa and 92%, separately, with recovery ability. The compressible spongy anode is highly recommended for flexible electrochemical energy storage devices and the novel gas-forming technique is a potential method for fabrication of multi morphology electrode.