Porous polyhedral carbon matrix for high-performance Li/Na/K-ion battery anodes

A carbon matrix for high-capacity Li/Na/K-alloy-based anode materials is required because it can effectively accommodate the variation in the volume of Li/Na/K-alloy-based anode materials during cycling. Herein, a nanostructured porous polyhedral carbon (PPC) was synthesized via a simple two-step method consisting of carbonization and selective acid etching, and their electrochemical Li/Na/K-ion storage performance was investigated. The highly uniform PPC, with an average particle size of 800 nm, possesses a porous structure and large specific surface area of 258.82 cm(2) g(-1). As anodes for Li/Na/K-ion batteries (LIBs/NIBs/KIBs), the PPC matrix exhibited large initial reversible capacity, fast rate capability (LIB: similar to 320 mAh g(-1) at 3C; NIB: similar to 140 mAh g(-1) at 2C; KIB: similar to 110 mAh g(-1) at 2C), better cyclic performance (LIB: similar to 550 mAh g(-1); NIB: similar to 210 mAh g(-1); KIB: similar to 190 mAh g(-1) at 0.2C over 100 cycles), high ionic diffusivity, and excellent structural robustness upon cycling, which demonstrates that the PPC matrix can be highly used as a carbon matrix for high-capacity alloy-based anode materials for LIBs/NIBs/KIBs. [GRAPHICS] .

Automated summary

In this study, a nanostructured porous polyhedral carbon (PPC) was synthesized as a carbon matrix for high-capacity Li/Na/K-alloy-based anode materials. The PPC matrix exhibited large initial reversible capacity, fast rate capability, better cyclic performance, high ionic diffusivity, and excellent structural robustness in Li/Na/K-ion batteries, indicating its potential usage in high-capacity alloy-based anode materials.