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In this work, using spin-polarized density functional theory in conjunction with the phonon Boltzmann transport equation, we reveal that a small biaxial tensile strain can significantly increase the thermal conductivity of the planar 2D ferromagnetic NiI2 through suppression of spin-phonon coupling, identifying a distinct magnetic mechanism for strain-controlled thermal transport. At 21 K, only 0.4% biaxial tensile strain enhances the thermal conductivity from 0.61 to 3.71 W\/(mK). This improvement originates from a substantial increase in phonon relaxation time driven by symmetric lattice expansion, along with a marked suppression of spin-phonon coupling. Temperature-resolved scattering calculations show that, within the investigated range of 5\u201321 K, the temperature dependence of three-phonon (3ph) scattering is more pronounced than that of the four-phonon (4ph) contribution, while 3ph scattering remains dominant in absolute magnitude. These results establish spin-phonon coupling as an additional degree of freedom for regulating heat transport in planar 2D magnets.<\/jats:p>","DOI":"10.1021\/acsami.6c14912","type":"journal-article","created":{"date-parts":[[2026,9,26]],"date-time":"2026-09-26T15:02:24Z","timestamp":1790434944000},"page":"53677-53683","source":"Crossref","is-referenced-by-count":0,"title":["Strain-Induced Enhancement of Thermal Conductivity of Monolayer NiI2 via Suppressed Spin-Phonon Coupling"],"prefix":"10.1021","volume":"18","author":[{"given":"Wenwen","family":"Chen","sequence":"first","affiliation":[{"name":"Southwest Jiaotong University , , ,","place":["Chengdu, China, 610031"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3960-9484","authenticated-orcid":true,"given":"Dingbo","family":"Zhang","sequence":"additional","affiliation":[{"name":"Southwest Jiaotong University , , ,","place":["Chengdu, China, 610031"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8567-6998","authenticated-orcid":true,"given":"Yuxiang","family":"Ni","sequence":"additional","affiliation":[{"name":"Southwest Jiaotong University , , ,","place":["Chengdu, China, 610031"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2026,9,26]]},"reference":[{"issue":"3","key":"2026100705062753400_cit1","doi-asserted-by":"publisher","first-page":"442","DOI":"10.1016\/j.joule.2018.01.006","article-title":"Two-Dimensional Materials for Thermal Management Applications","volume":"2","author":"Song","year":"2018","journal-title":"Joule"},{"issue":"1","key":"2026100705062753400_cit2","doi-asserted-by":"publisher","first-page":"1","DOI":"10.1038\/s41467-023-39004-4","article-title":"Multi-state data storage in a two-dimensional stripy antiferromagnet implemented by magnetoelectric effect","volume":"14","author":"Gu","year":"2023","journal-title":"Nat. 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