Mn-Doped Na₄Fe₃(PO₄)₂P₂O₇ as a Low-Cost and High-Performance Cathode Material for Sodium-Ion Batteries

Abstract

Na4Fe3(PO4)2P2O7 (NFPP) is considered to be an ideal cathode material for sodium-ion batteries due to its high theoretical capacity, stable structure, small volume change, low cost, and nontoxicity. However, the inherent low electronic conductivity of polyanionic materials limits the application of this material. In this work, we improved the electronic conductivity and structural stability of the material through a dual modification synergistic strategy of manganese ion doping and surface carbon coating and prepared Na4Fe2.9Mn0.1(PO4)2P2O7@C (0.1 Mn-NFPP@C) composites by a simple mechanical-assisted chemical synthesis method. It can release 119.6 mAh g–1 at 0.1C. The capacity retention rate is 97.4% after 100 cycles at 1C and 84.8% after 3000 cycles at 10C. Many tests and calculations in this work also show that 0.1 Mn-NFPP@C modified by Mn2+ doping and carbon coating has higher electronic conductivity and electrochemical kinetics and thus exhibits better electrochemical performance.

Progress and perspectives on iron-based electrode materials for alkali metal-ion batteries: a critical review

“…Tao et al . 288 reported a dual modification synergistic strategy of manganese ion doping and surface carbon coating and prepared Na 4 Fe 2.9 Mn 0.1 (PO 4 ) 2 P 2 O 7 @C (0.1Mn-NFPP@C) to boost the performance of another NASICON-type mixed phosphate material, Na 4 Fe 3 (PO 4 ) 2 P 2 O 7 (NFPP). Because the ionic radius of Mn 2+ is slightly larger than that of Fe 2+ , doping does not have a significant effect on the structure and expands the lattice spacing.…”

Towards High-Performance Sodium-Ion Batteries via the Phase Regulation Strategy

“…The overuse of fossil fuels has caused severe energy shortages and environmental contamination problems. Nowadays, building a sustainable development human society via large-scale renewable energy storage technology has become a key to solving these problems. − Sodium-ion batteries (SIBs) had attracted wide attention because they work based on similar principles as lithium-ion batteries but replace lithium with sodium element to eliminate lithium dependence. − In the commercialization process of SIBs, cathode materials played a decisive role. − Up to now, these cathode materials with commercialized prospects were mainly divided into the following three categories: transition-metal oxides, − polyanion compounds, − and prussian blue analogues. − Polyanion-type Fe-based phosphate cathode materials have received extensive interest due to their nontoxic nature, high structural stability, and lower cost. − The widely utilized olivine lithium iron phosphate (LiFePO 4 ), known as LFP, has served as a representative polyanionic iron-based phosphate cathode for lithium-ion batteries (LIBs). However, its counterpart, olivine NaFePO 4 , is not suitable for SIBs due to its complex synthesis route.…”

Tremella-like Zn–Al–Zr-Layered Double-Hydroxide/Graphene Oxide Nanocomposites for Enhanced Phosphorus Recovery

“…Until now, the applications of phosphorus (P) and its derivates are present everywhere in our life; they have been widely used in the fields of agriculture, food, pharmacy, electronics, new energy, and daily chemical products. , With enjoying the benefits from P, its discharge will also inevitably lead to increased contamination to the ecological environment. If the concentration of total P (TP) exceeds 0.02 mg/L in the aquatic environment, it can cause water eutrophication and trigger the burst of algal blooms, which seriously threatens the safety of our drinking water .…”