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LiNi<jats:italic><jats:sub>x<\/jats:sub><\/jats:italic>Co<jats:italic><jats:sub>y<\/jats:sub><\/jats:italic>Mn<jats:sub>1\u2212<\/jats:sub><jats:italic><jats:sub>x<\/jats:sub><\/jats:italic><jats:sub>\u2212<\/jats:sub><jats:italic><jats:sub>y<\/jats:sub><\/jats:italic>O<jats:sub>2<\/jats:sub> (NCM) is considered as an ideal cathode material to meet the urgent needs of high\u2010energy\u2010density batteries. However, the oxygen precipitation reaction of NCM cathode at high temperature brings serious safety concerns. In order to promote high\u2010safety lithium\u2010ion batteries, herein, a new type of flame\u2010retardant separator is prepared using flame\u2010retardant (melamine pyrophosphate, MPP) and thermal stable Poly(vinylidene fluoride\u2010<jats:italic>co\u2010<\/jats:italic>hexafluoropropylene) (PVDF\u2010HFP). MPP takes the advantage of nitrogen\u2013phosphorus synergistic effect upon the increased internal temperature of LIBs, including the dilution effect of noncombustible gas and the rapidly suppression of undesirable thermal runaway. The developed flame\u2010retardant separators show negligible shrinkage over 200\u00a0\u00b0C and it takes only 0.54 s to extinguish the flame in the ignition test, which are much superior to commercial polyolefin separators. Moreover, pouch cells are assembled to demonstrate the application potential of PVDF\u2010HFP\/MPP separators and further verify the safety performance. It is anticipated that the separator with nitrogen\u2013phosphorus flame\u2010retardant can be extensively applied to various high\u2010energy\u2010density devices owing to simplicity and cost\u2010effectiveness.<\/jats:p>","DOI":"10.1002\/smll.202207453","type":"journal-article","created":{"date-parts":[[2023,3,24]],"date-time":"2023-03-24T06:23:38Z","timestamp":1679639018000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":33,"title":["Separator with Nitrogen\u2013Phosphorus Flame\u2010Retardant for LiNi<i><sub>x<\/sub><\/i>Co<i><sub>y<\/sub><\/i>Mn<sub>1\u2212<\/sub><i><sub>x<\/sub><\/i><sub>\u2212<\/sub><i><sub>y<\/sub><\/i>O<sub>2<\/sub> Cathode\u2010Based Lithium\u2010Ion Batteries"],"prefix":"10.1002","volume":"19","author":[{"given":"Chengyu","family":"Han","sequence":"first","affiliation":[{"name":"Key Laboratory for Green Chemical Technology of Ministry of Education School of Chemical Engineering and Technology Tianjin University  Tianjin 300072 China"},{"name":"Haihe Laboratory of Sustainable Chemical Transformations  Tianjin 300192 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yu","family":"Cao","sequence":"additional","affiliation":[{"name":"Key Laboratory for Green Chemical Technology of Ministry of Education School of Chemical Engineering and Technology Tianjin University  Tianjin 300072 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shaojie","family":"Zhang","sequence":"additional","affiliation":[{"name":"Key Laboratory for Green Chemical Technology of Ministry of Education School of Chemical Engineering and Technology Tianjin University  Tianjin 300072 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Liyang","family":"Bai","sequence":"additional","affiliation":[{"name":"Jiewei Power Co. 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