Lithium-sulfur　(Li-S)　batteries　offer　ultra-high　theoretical　energy　density　(2600　Wh kg⁻¹)　but　face　commercialization　hurdles　from　polysulfide　shuttling　and　sulfur　flammability.　A　multifunctional　biomass-derived　binder　by　modifying　aloevera　gel　(AG)　with　phytic　acid　(PA)　is　designed　for　addressing　these　two　issues.　The　AG-PA　binder　provides　strong　mechanical　integrity　for　the　sulfur　cathode　and　features　N-,　O-,　and　P-rich　polar　groups　that　chemically　anchor　lithium　polysulfides　(LiPSs)　and　accelerate　Li⁺　deposition.　This　enhances　LiPSs　redox　kinetics　and　suppresses　shuttling.　Consequently,　AG-PA-based　Li-S　cells　deliver　a　high　initial　capacity　of　776.1　mAh g⁻¹　and　retain　527.0　mAh g⁻¹　at　4　C　(1　C　=　1675　mA g−1)　after　1000　cycles　(ultralow　decay:　0.032%　per　cycle).　Crucially,　during　combustion,　heat　decomposes　AG-PA＇s　phosphorus　groups,　generating　phosphoric　acid　and　water　vapor　that　form　a　physical　barrier　isolating　oxygen/heat.　Simultaneously,　PO·　radicals　scavenge　H·/HO·　radicals,　quenching　chain　reactions.　This　dual-action　significantly　enhances　safety.　This　work　establishes　a　scalable　biomass　engineering　approach　to　concurrently　boost　energy　density,　cyclability,　and　safety　in　Li-S　batteries,　bridging　gaps　towards　practical　deployment.　©　2025　Wiley-VCH　GmbH.