Facile synthesis and phase stability of Cu-based Na₂Cu(SO₄)₂·xH₂O (x = 0–2) sulfate minerals as conversion type battery electrodes

Abstract

Mineral exploration forms a key approach for unveiling functional battery electrode materials.

A Comprehensive Review on Strategies for Enhancing the Performance of Polyanionic-Based Sodium-Ion Battery Cathodes

“…106 In another study, Na 2 Cu(SO 4 ) 2 and its water derivative with high redox potential lead to minimal (de)intercalation capacity. 107 The possible solutions to address the issue related to Cu-based polyanions include alteration of carbon content in electrode or structuring cathode compound at nanoscale. 107 Cubased polyanionic cathodes are relatively inexpensive and may emerge as potential battery electrodes that involve conversion redox reactions 2.7.…”

“…In another study, Na 2 Cu­(SO 4 ) 2 and its water derivative Na 2 Cu­(SO 4 ) 2 ·2H 2 O were prepared, and their redox mechanism was observed. The high Jahn–Teller distortion of Cu 2+ along with high redox potential lead to minimal (de)­intercalation capacity . The possible solutions to address the issue related to Cu-based polyanions include alteration of carbon content in electrode or structuring cathode compound at nanoscale .…”

Calorimetric Study of Mixed Phosphates Na4M3(PO4)2P2O7 (M = Mn2+, Fe2+, Co2+, Ni2+) to Evaluate the Electrochemical Trends

“…Previous calorimetric studies from our group have provided insights into thermodynamic influence on the structure–property relationships in suites of battery materials. The observed energetics and electrochemical behavior were attributed to their structure, the difference in their ionic radii, and the corresponding effect on bonding, acid–base interactions, enhanced stability owing to hydration, and polymorphic phase selection. − In this paper, we have employed high-temperature oxide melt solution calorimetry to measure enthalpies of formation to elucidate the observed electrochemical behavior in the Na 4 M 3 (PO 4 ) 2 P 2 O 7 family. We found a strong correlation between the energetic stability and ionic radii of the transition metal (M = Mn 2+ , Fe 2+ , Co 2+ , Ni 2+ ), which provides insights into the observed trend in capacity.…”

A new mineral cuprodobrovolskyite Na4Cu(SO4)3 from the Tolbachik volcano (Kamchatka, Russia) and relationships in the family of natural anhydrous Na–Cu sulfates

“…The anhydrous sodium-copper sulfates are of interest for mineralogists, geochemists, physicists and materials scientists because of their genetic significance in postvolcanic fumarolic systems and perspective magnetic and non-linear optic properties (Kovrugin et al, 2019;Borisov et al, 2021;Siidra et al, 2021aSiidra et al, , 2021bSiidra et al, , 2021cSingh et al, 2022). These papers have shown, for example, that the eldfellite-type phase NaFe(SO 4 ) 2 is characterised by 8 mAh/g of reversible capacity with a discharge voltage of 3.0 V and that the synthetic analogue of saranchinaite can be considered as a high voltage cathode (4.84 V vs Li + /Li 0 ).…”