A Ni3S2-PEDOT monolithic electrode for sodium batteries

Abstract

Ni 3 S 2 attracts much attention for sodium batteries owing to its natural abundance, low cost, and high theoretical capacity. However, poor conductivity of Ni 3 S 2 and large volume expansion hamper its potential application. We describe a facile strategy to construct monolithic Ni 3 S 2 -Poly(3,4-ethylenedioxythiophene) (PEDOT) electrodes with stable electrochemical performance for sodium batteries. Ni 3 S 2 is directly grown on Ni foam substrate with superior electron transport efficiency. The PEDOT layer would efficiently protect the Ni 3 S 2 from being wrecked by the severe volume expansion during charge-discharge process. The as-prepared Ni 3 S 2 -PEDOT electrodes display stable cycling performance with a capacity of 280 mAh g −1 after 30 cycles between 0.5 and 2 V.

Advances and Challenges in Metal Sulfides/Selenides for Next‐Generation Rechargeable Sodium‐Ion Batteries

“…Owing to the low content of sulfur in the molecular formula, it possesses a low theoretical capacity of 446 mA h g −1 . As for the synthesis methods, Ni 3 S 2 grown in situ was made from polished nickel plate or nickel foam by treating it by the sulfuration method . rGO–Ni 3 S 2 was synthesized through solvothermal reaction or spray drying together with a sulfuration process .…”

“…The stable discharge capacity was around 175 µA h cm −3 at 20 mA cm −2 . Shang et al used nickel foam and treated it by the hydrothermal method, but the as‐prepared materials still suffered from low capacity retention of less than 60% after 50 cycles . Song et al also prepared nanostructured Ni 3 S 2 on nickel foam, but the capacity slowly dropped after around the 60th cycle.…”

Heterogeneous Nanostructures for Sodium Ion Batteries and Supercapacitors

“…Again, surface modification is also useful to overcome the drawback of poor conductivity of the common high-capacity SIB anode materials. These coating materials include carbon,e specially graphene and its derivatives (G, [60][61][62][63][64][65][66] GO, [67,68] rGO [69] ), polymers such as poly(3,4-ethylenedioxythiophene)( PEDOT), [70] and metal oxides such as Al 2 O 3 . [71,72] In most cases, evident electrochemical performance enhancement was achieved (see detailed list in Ta ble 2).…”

Fe7Se8 encapsulated in N-doped carbon nanofibers as a stable anode material for sodium ion batteries

“…However, the large radius of sodium ion results in the sluggish reaction kinetics and large volume variation during sodium ion insertion/deinsertion and further hinders the rate capability and cycling stability of corresponding SIBs [13,14]. To address these issues, downsizing the active materials to nanoscale and surface coating to suppress volume effect are common strategies [15,16]. For example, Chen et.al reported micro-nano hierarchitectures of urchin-like Fe 3 Se 4 effectively displays the remarkable rate performance (200.2 mAh g -1 at 30 A g -1 ) [17].…”