Sodium-Ion Batteries

5Prussian Blue Analogue Cathodes for Sodium‐Ion Batteries

5.1 Introduction

In addition to the transition metal oxide cathodes (Chapter 33) and polyanion‐type cathodes (Chapter 44), Prussian Blue Analogues (PBAs) with large three dimensional (3D) channels are also favorable for the sodium insertion/extraction. The history of Prussian Blue (PB) dates back to the discovery of distinct blue hue from an old pigment recipe by the paint maker Diesbach in Berlin around 1706. Their striking color of PB had once been the myth that scientists were highly curious about. The eye‐catching optical transition property of PB was first correlated to mixed‐valence chemistry of a specific group of elements. With the hindsight of quantum mechanics, people eventually ...