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However, their commercialization remains hindered by significant thermal safety concerns. In this work, using an ultrahigh Ni\u2010rich layered oxide cathode (Ni accounts for 96%) paired with a mixed Si@C anode as a model system, we systematically investigate real\u2010time gas evolution behavior and elucidate the underlying mechanisms of gas generation at both cathode\/anode electrodes, along with their crosstalk reactions during thermal runaway. The results reveal severe gas emission from the Si@C anode, with H\n                    <jats:sub>2<\/jats:sub>\n                    constituting 71.12% (mass ratio) of the total gas released. Meanwhile, the Ni96 cathode releases active oxygen species (O\n                    <jats:sup>n\u2212<\/jats:sup>\n                    \/O\n                    <jats:sub>2<\/jats:sub>\n                    ) at elevated temperatures (e.g., 220\u00b0C), which react with reducing gases generated from the Si@C anode and electrolyte, thereby triggering the onset of thermal runaway. Furthermore, a specially tailored low\u2010hydrogen (low\u2010H) electrolyte is employed to effectively suppress H\n                    <jats:sub>2<\/jats:sub>\n                    evolution, thereby enhancing the safety of high specific energy battery systems. These insights into gas evolution mechanisms provide a foundation for the targeted design of battery materials and the formulation of practical safety strategies for the low\u2010altitude sector.\n                  <\/jats:p>","DOI":"10.1002\/anie.5057887","type":"journal-article","created":{"date-parts":[[2026,7,21]],"date-time":"2026-07-21T12:06:11Z","timestamp":1784635571000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Elucidating the Origin of Intensified Thermal Safety Concerns of Practical Next\u2010Generation High\u2010Energy\u2010Density Li\u2010Ion Batteries"],"prefix":"10.1002","volume":"65","author":[{"given":"Wenbin","family":"Tu","sequence":"first","affiliation":[{"name":"State Key Laboratory of Physical Chemistry of Solid Surfaces, Department of Chemistry, College of Chemistry and Chemical Engineering Xiamen University  Xiamen P. R. 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