Scalable Strategy for High‐Performance Hybrid Supercapacitor and Battery‐Type Electrode Materials

Abstract

Compact, lightweight, and powerful energy storage devices are urgently needed in more and more fields. Layered double hydroxides (LDH) as hybrid supercapacitors and battery‐type electrode materials play an important role in energy storage devices. Herein, a method for large‐scale production of electrode materials via simple ball milling with or without dispersant is shown and demonstrates the relationship between performance and particle size of the ternary hydroxide precursor. When the dispersant is added, the secondary particles are effectively broken, on the basis of which it is found that preventing the primary particles from agglomerating into secondary particles is the key to improving the specific capacitance of the material. In addition, the effect of different milling balls on the morphology and electrochemical properties of NCM811‐OH with dispersants is investigated. When dispersant is added and NCM‐OH‐S is used for ball milling, the secondary particles can be more effectively broken. In the comparative experiments with different Ni contents, Ni1/3Co1/3Mn1/3(OH)2 shows the best electrochemical performance (1,417 F g−1 at 1 A g−1), indicating that the material with moderate Ni content has the optimized electrochemical performance. These findings provide a new avenue for large‐scale production of high‐performance LDH electrode materials.