Engineering CoP Alloy Foil to a Well‐Designed Integrated Electrode Toward High‐Performance Electrochemical Energy Storage

• DOI: 10.1002/adma.202209924
• Publication Date: 2022-11-29T11:06:13Z
• Authors: Mengqian Wu; Jiang Wang; Zhaozhao Liu; Xinyu Liu; Jingying Duan; Ting Yang; Jiao Lan; Yongwen Tan; Chengyang Wang; Mingming Chen; Kemeng Ji
• Keywords: Nanoporous

Nanostructured integrated electrodes with binder-free design show great potential to solve the ever-growing problems faced by currently commercial lithium-ion batteries such as insufficient power and energy densities. However, there are still many challenging limiting practical application of this emerging technology, in particular complex manufacturing process, high fabrication cost, low loading mass active material. Different from existing strategies, here using a CoP alloy foil precursor simple neutral salt solution-mediated electrochemical dealloying method well address above issues is demonstrated. The resultant freestanding mesoporous np-Co(OH)x /Co2 P product possesses not only compositions specific capacity large electrode packing density (>3.0 g cm-3 ) meet requirements, high-conductivity well-developed nanoporous framework achieve simultaneously fast ion electron transfer, but also interconnected ligaments suitable free space ensure strong structural stability. Its comprehensively excellent storage (EES) performances both lithium/sodium-ion capacitors can further illustrate effectiveness preparation strategy, remarkable reversible capacities/capacitances, dominated pseudo-capacitive EES mechanism, ultra-long cycling life. This study provides new insights into high-performance for applications.