Researchers affiliated with Henan Normal University and Qilu University of Technology have engineered an anode material that integrates metals recovered from spent batteries alongside carbon derived from lignin, a byproduct of the lumber and paper sectors.
To fabricate this novel material, scientists initially isolated metal compounds from used mobile device batteries and subsequently blended these with purified lignin. Through several steps involving chemical refinement and carbonization under a nitrogen atmosphere, a distinct porous structure resembling a honeycomb was established.
This specific architecture enhances the penetration of the electrolyte into the material and expedites the movement of sodium ions, benefiting the battery’s overall performance.
According to the study’s originators, the lignin serves a purpose beyond simply acting as a carbon additive. During processing, it encourages the genesis of an additional sulfide phase, Co9S8, resulting in a more efficient dual-phase composition within the anode. This improves the material’s electrical conductivity, optimizes charge transfer, and boosts stability over numerous charge-discharge cycles.
In testing, the material exhibited an initial capacity exceeding 1060 mAh per gram. Following 100 charge-discharge cycles, approximately 244 mAh/g remained, and after 300 cycles, about 207 mAh/g was retained. The investigators also observed faster sodium ion transport and superior stability when contrasted with baseline samples.
The work’s authors contend that this technology offers a pathway toward developing more affordable and environmentally sound batteries suitable for electric vehicles, energy storage installations, and portable electronics. A further benefit highlighted is the capacity to simultaneously repurpose two distinct waste streams: e-waste and residual materials from wood processing operations.
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