{"product_id":"csibcdatnfs","title":"Defective Alluaudite-Type Na2.6Fe1.7(SO4)3 (NFS) Powder for High-Voltage (~4.5 V) Na-Ion Battery Cathode, 100-500 g\/bottle, CSIBCDATNFS","description":"\u003cp\u003eDefective alluaudite-type sodium iron sulfate, Na2.6Fe1.7(SO4)3 (NFS), represents a highly critical non-stoichiometric phase within the Na(2+2x)Fe(2-x)(SO4)3 family (x=~0.3). While stoichiometric Na2Fe2(SO4)3 theoretically delivers an exceptional operating potential (3.8 V vs. Na+\/Na) driven by the strong inductive effect of the polyanionic [SO4]^{2-} groups, synthesis limitations typically necessitate working with these iron-deficient\/sodium-rich configurations. Managing and engineering these native defects is central to unlocking their viability for low-cost, high-voltage sodium-ion battery (SIB) cathodes.\u003c\/p\u003e\n\u003cp\u003eThe composition Na2.6Fe1.7(SO4)3 is inherently a thermo-deficient phase. Because sulfate frameworks cannot withstand high calcination temperatures without decomposing (\u0026gt;400°C), they are synthesized via low-temperature sol-gel, spray drying, or aqueous precipitation. This creates distinct crystalline defects:\u003c\/p\u003e\n\u003cp\u003e(1) \u003cstrong\u003eIron Vacancies and Multi-Site Na Distortions\u003c\/strong\u003e: To maintain charge neutrality when Fe^{2+} is deficient (1.7 instead of 2.0), additional Na+ ions populate the framework. This forces excess sodium into interstitial sites or directly substitutes onto Fe structural positions. (2) \u003cstrong\u003eFe Migration and Phase Irreversibility\u003c\/strong\u003e: During high-voltage extraction (desodiation), the structural instability of these heavily defected sites allows Fe^{3+} ions to migrate into adjacent vacant sodium pathways. This blocks the 1D\/3D percolation channels, causing sluggish Na+$ transport kinetics. (3) \u003cstrong\u003eLattice Heterogeneity and Splitting\u003c\/strong\u003e: The native strain induced by the Na\/Fe disorder causes highly localized polyhedral distortions. Under high-rate cycling, this structural mismatch results in catastrophic polyhedral fracture, micro-cracking of the cathode particles, and massive electrochemical decay.\u003c\/p\u003e\n\u003ctable width=\"100%\" style=\"width: 100%; height: 661.576px;\"\u003e\n\u003ctbody\u003e\n\u003ctr style=\"height: 53.275px;\"\u003e\n\u003ctd style=\"width: 33.6331%; height: 53.275px;\"\u003e\u003cem\u003ePart Number\u003c\/em\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 66.0072%; height: 53.275px;\"\u003e\n\u003cp\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003eCSIBCDATNFS (C-SIB-C-DATNFS)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 38.2125px;\"\u003e\n\u003ctd style=\"width: 33.6331%; height: 38.2125px;\"\u003e\u003cem\u003eChemical Formula\u003c\/em\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 66.0072%; height: 38.2125px;\"\u003e\n\u003cp\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003eNa2.6Fe1.7(SO4)3\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 35.6px;\"\u003e\n\u003ctd style=\"width: 33.6331%; height: 35.6px;\"\u003e\u003cem\u003eChemical Composition\u003c\/em\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 66.0072%; height: 35.6px;\"\u003e\n\u003cp\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003eNa: 13.31 wt%, Fe: 21.25 wt%, S: 20.77 wt%, C: 2.27 wt%\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 106.8px;\"\u003e\n\u003ctd style=\"width: 33.6331%; height: 106.8px;\"\u003e\u003cem\u003eParticle Size Distribution\u003c\/em\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 66.0072%; height: 106.8px;\"\u003e\n\u003cp\u003e\u003cspan\u003eD10 = 1.65 um\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eD50 = 5.07 um\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eD90 = 11.62 um\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 21.1375px;\"\u003e\n\u003ctd style=\"width: 33.6331%; height: 21.1375px;\"\u003e\u003cem\u003eTap Density\u003c\/em\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 66.0072%; height: 21.1375px;\"\u003e0.94 g\/cm3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"width: 33.6331%; height: 19.6px;\"\u003e\u003cem\u003eCompaction Density\u003c\/em\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 66.0072%; height: 19.6px;\"\u003e2.15 g\/cm3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 23.6625px;\"\u003e\n\u003ctd style=\"width: 33.6331%; height: 23.6625px;\"\u003e\u003cem\u003eSpecific Area\u003c\/em\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 66.0072%; height: 23.6625px;\"\u003e7.29 m2\/g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 75.663px;\"\u003e\n\u003ctd style=\"width: 33.6331%; height: 75.663px;\"\u003e\u003cem\u003eXRD\u003c\/em\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 66.0072%; height: 75.663px;\"\u003e\n\u003cdiv style=\"text-align: start;\"\u003e\u003cimg style=\"margin-bottom: 16px; float: none;\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0774\/6591\/1526\/files\/CSIBCDATNFS_XRD_160x160.png?v=1780435134\"\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 206.6px;\"\u003e\n\u003ctd style=\"width: 33.6331%; height: 206.6px;\"\u003e\u003cem\u003eFirst Discharging Capacity\u003c\/em\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 66.0072%; height: 206.6px;\"\u003e\n\u003cp\u003e~95 mAh\/g (0.1 C, 2.0-4.5 V vs. Na+\/Na)\u003c\/p\u003e\n\u003cdiv style=\"text-align: start;\"\u003e  \u003cimg style=\"margin-bottom: 16px; float: none;\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0774\/6591\/1526\/files\/CSIBCDATNFS_Test_160x160.png?v=1780435135\"\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"text-align: start;\"\u003eElectrolyte: 1 M NaClO4 in EC:PC=1:1 with 5% FEC\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 45.425px;\"\u003e\n\u003ctd style=\"width: 33.6331%; height: 45.425px;\"\u003e\u003cem\u003eFirst Columbic Efficiency\u003c\/em\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 66.0072%; height: 45.425px;\"\u003e\n\u003cp\u003e94.0% \u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 35.6px;\"\u003e\n\u003ctd style=\"width: 33.6331%; height: 35.6px;\"\u003e\u003cem\u003ePackage Grade\u003c\/em\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 66.0072%; height: 35.6px;\"\u003e\n\u003cp\u003e100-500 g\/bottle\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eNotes\u003c\/strong\u003e: (1) Please store the defective NFS powder in a dry area (glovebox is preferred); (2) The battery powder is highly recommended to be dried at 80-100°C in a vacuum oven for 6-12 h before use.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eReferences\u003c\/strong\u003e: \u003c\/span\u003e\u003c\/p\u003e\n\u003col\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/onlinelibrary.wiley.com\/doi\/abs\/10.1002\/anie.8606538\"\u003e\u003cspan\u003eJ. Wang, et al. NaO6 Octahedron-Engineered Sodium Iron Sulfate Cathodes for High-Rate and Sustainable Sodium-Ion Batteries, Angew Chem Int Ed, DOI: 10.1002\/anie.8606538.\u003c\/span\u003e\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003ca href=\"https:\/\/pubs.rsc.org\/en\/content\/articlelanding\/2025\/ta\/d5ta07317k\/unauth\"\u003eS. Zhou, et al. Expanding the Fe–Fe distance for superior electrochemical performance of Na2.6Fe1.7(SO4)3 cathodes for sodium-ion batteries, J. Mater. Chem. A, 2025,13, 42038-42047\u003c\/a\u003e \u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"SZKJ","offers":[{"title":"100 g","offer_id":47736720031974,"sku":"CSIBCDATNFS100","price":49.0,"currency_code":"USD","in_stock":true},{"title":"200 g","offer_id":47736720064742,"sku":"CSIBCDATNFS200","price":89.0,"currency_code":"USD","in_stock":true},{"title":"500 g","offer_id":47736720097510,"sku":"CSIBCDATNFS500","price":189.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0774\/6591\/1526\/files\/CSIBCDATNFS_main.png?v=1780435137","url":"https:\/\/echemsupplies.com\/products\/csibcdatnfs","provider":"EChem Supplies","version":"1.0","type":"link"}