Large-Scale Fabrication of Stable Silicon Anode in Air for Sulfide Solid State Batteries via Ionic-Electronic Dual Conductive Binder.

The construction of a continuous ionic/electronic pathway is critical for Si-based sulfide all-solid-state batteries (ASSBs) with the advantages of high-energy density and high-cycle stability. However, a significant impediment arises from the parasitic reaction occurring between the ionic sulfide solid-state electrolyte (S-SE) and electronic carbon additive, posing a formidable challenge. Additionally, the fabrication of electrodes necessitates stringent operational conditions, further limiting practical applicability. Herein, we report an ionic-electronic dual conductive binder for the fabrication of robust silicon anode under ambient air conditions in the absence of high-cost and air-sensitive S-SE for ASSBs. This binder incorporates in-situ reduced silver nanoparticles (AgNPs) into a high-strength polymer rich in ether bonds, establishing a conductive pathway for lithium ions and electrons. With the binder-composited Si anode, the half-cell exhibits a remarkable capacity of 1906.9 mAh g -1 and stable cycling for 500 cycles at a current density of 2 C (4.4 mA cm -2 ) under a low stack pressure of 5 MPa. The full cell using Ni 0.9 Co 0.075 Mn 0.025 O 2 (NCM90) exhibits a remark cycling stability within 2,000 cycles at 5 C (8 mA cm -2 ). This work presents an inspired design of functional binders for large-scale manufacture and mild operation in a low-cost way for Si anodes in ASSBs. This article is protected by copyright. All rights reserved.