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Upcycling of phosphogypsum waste for efficient zinc-ion batteries

Journal of Energy Chemistry 2023年第6期81卷 157-166,I0006页

作者： Huanwen Wang Can Luo Yinyin Qian Caihong Yang Xiaojun Shi Yansheng Gong Rui Wang Beibei He Jun Jin Aidong Tang Edison Huixiang Ang Huaming Yang Engineering Research Center of Nano-Geomaterials of Ministry of Education China University of GeosciencesWuhan 430074HubeiChina Faculty of Materials Science and Chemistry China University of GeosciencesWuhan 430074HubeiChina Key Laboratory of Functional Geomaterials in China Nonmetallic Minerals Industry China University of GeosciencesWuhan 430074HubeiChina College of Chemistry and Chemical Engineering Central South UniversityChangsha 410083HunanChina Natural Sciences and Science Education National Institute of EducationNanyang Technological UniversitySingapore 637616Singapore School of Minerals Processing and Bioengineering Central South UniversityChangsha 410083HunanChina

Zinc metal is a promising anode material for next-generation aqueous batteries,but its practical application is limited by the formation of zinc dendrite.To prevent zinc dendrite growth,various Zn^(2+)-conducting but water-isolating solid-electrolyte interphase(SEI)films have been developed,however,the required high-purity chemical materials are extremely expensive.In this work,phosphogypsum(PG),an industrial byproduct produced from the phosphoric acid industry,is employed as a multifunctional protective layer to navigate uniform zinc deposition.Theoretical and experimental results demonstrate that PG-derived CaSO_(4)2H_(2)O can act as an artificial SEI layer to provide fast channels for Zn^(2+)transport.Moreover,CaSO_(4)2H_(2)O could release calcium ions(Ca^(2+))due to its relatively high Kspvalue,which have a higher binding energy than that of Zn^(2+)on the Zn surface,thus preferentially adsorbing to the tips of the protuberances to force zinc ions to nucleate at inert region.As a result,the Zn@PG anode achieves a high Coulombic efficiency of 99.5%during 500 cycles and long-time stability over 1000 hours at 1 m A cm^(-2).Our findings will not only construct a low-cost artificial SEI film for practical metal batteries,but also achieve a high-value utilization of phosphogypsum waste.

关键词： Upcycling phosphogypsum waste Zinc-ion battery Solid-electrolyte-interface Protection layer

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