Catalytic graphitization of porous graphitic carbon derived from needle coke as anode materials for lithium-ion batteries
In this work, potassium perferite (K _2 FeO _4 ) is used as a catalyst in a straightforward and effective process of simultaneous activation and graphitization to create porous graphitized carbon (PGC), with coal-based green needle coke acting as starting material. The impacts of heating temperature...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
IOP Publishing
2025-01-01
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| Series: | Materials Research Express |
| Subjects: | |
| Online Access: | https://doi.org/10.1088/2053-1591/adc068 |
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| Summary: | In this work, potassium perferite (K _2 FeO _4 ) is used as a catalyst in a straightforward and effective process of simultaneous activation and graphitization to create porous graphitized carbon (PGC), with coal-based green needle coke acting as starting material. The impacts of heating temperatures and K _2 FeO _4 solution concentrations on the microstructure, morphology, and electrochemical lithium storage ability were thoroughly investigated. The as-synthesised PGC materials have a high specific surface area of 260.55 m ^2 g ^−1 and a good three-dimensional porous structure. Optimized PGC material synthesized at a temperature of 900 °C and concentrations of K _2 FeO _4 solutions show excellent rate performance and cycling stability, making it a promising anode material for lithium-ion batteries (LIBs). At a current density of 100 mAg ^−1 , it has a comparatively high specific discharge capacity of 386.05 mAh g ^−1 together with strong cycling stability (90.79% retention rate after 400 cycles). It maintains a discharge capacity of 325 mAh g ^−1 in the multiplicity test at a high current density of 1600 mA g ^−1 . It takes less time, energy, and is much more efficient to complete the synchronous carbonization and graphitization of needle coke when potassium perferite is used as a catalyst, as opposed to traditional high-temperature graphitized technology and conventional two-step activation and graphitization strategy. The green needle coke-derived PGC materials include many active sites and defects, a high electrical conductivity, a shortened ion diffusion pathway, and a unique micro-mesoporous structure that makes them suitable electrode materials for lithium-ion batteries. |
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| ISSN: | 2053-1591 |