Boosting Zn 2

doi:10.1016/j.ensm.2024.103476

Boosting Zn 2

2024-06-01

2

PRE

AI

DOI：10.1016/j.ensm.2024.103476

Original

Original request for help

Save

Abstract

En 中文

Rechargeable aqueous zinc -ion batteries (AZIBs) have received increasing attention on account of their ecofriendliness and low cost. However, the limited capacity and poor rate properties of cathodes remain a major challenge due to the low electrochemical reactivity of cathode materials and sluggish Zn 2+ transport kinetics. Herein, we design a 1,5-naphthalenediamine (NAPD) pre -intercalate potassium manganese dioxide (KMO-NAPD) with high capacity and rate capability for AZIBs. The introduction of NAPD can delocalize the d -electrons spin states of the Mn site and activate the reactivity of KMO-NAPD for Zn 2+ intercalation. Moreover, the interaction between intercalated Zn 2+ and KMO-NAPD is weakened due to the decreased electrostatic interaction force, which promotes the diffusion of Zn 2+ . Consequently, the KMO-NAPD cathode exhibits high specific capacity (237 mAh g -1 at 1 A g -1 ) satisfying rate capability (129 mAh g -1 at 4 A g -1 ), and excellent cycling stability (85 % capacity retention after 1000 cycles). Furthermore, the fabricated AZIBs based on the KMO-NAPD exhibit a high energy density of 294.3 Wh kg -1 and a peak power density of 8.6 kW kg -1 . This study opens up a new path for the development of high-energy organic -inorganic hybrid cathode materials with modulated electronic structures for advanced AZIBs.

Keywords:

Aqueous Zn-ion batteries

Cathode

Manganese dioxide

Zn 2+ intercalation

Electron delocalization

Boosting Zn 2

Abstract

Journal

Organization