重庆理工大学学报2024，Vol.38Issue(3)：314-321,8.DOI:10.3969/j.issn.1674-8425(z).2024.02.034
Pt掺杂CeO2对磷酸铁锂电池热失控特征气体CO的吸附与传感机理研究
Study on the adsorption and sensing mechanism of Pt doped CeO2 on the characteristic gas CO of thermal runaway in lithium iron phosphate batteries
摘要
Abstract
In recent years,the safety issues caused by the thermal runaway phenomenon of lithium iron phosphate energy storage batteries have attracted great attention.Effective detection of the characteristic quantity of thermal runaway gas is of great significance for evaluating its operating status,among which CO is an important characteristic gas for overcharging and thermal runaway of lithium iron phosphate energy storage batteries.Based on first principles,intrinsic CeO2,Pt doped modified CeO2 models,and CO absorption models are built.The modification mechanism and gas adsorption mechanism of CeO2 based gas sensing materials are analyzed from the aspects of adsorption energy,charge transfer,energy band,and density of states.Our results show the absorption energy of CO—CeO2 is only-0.202 8 eV,exhibiting weak physical absorption whereas Pt—CeO2 exhibits excellent chemical absorption performance for CO,with a corresponding charge transfer value of 0.029 0 eV.After doping with Pt,the energy band of CeO2 decreases from 1.933 eV to 1.259 eV,and the absorption distance for CO is cut from 3.183 Åto 2.021 Å.Therefore,Pt doped modified CeO2 serves as a candidate for CO detection sensors for thermal runaway characteristic gases in lithium iron phosphate batteries,providing theoretical support for the development of highly sensitive and low-power thermal runaway characteristic gas detection sensors for lithium iron phosphate energy storage batteries.关键词
磷酸铁锂电池/热失控特征气体/CO气体/Pt—CeO2/第一性原理计算Key words
lithium iron phosphate battery/thermal runaway characteristic gas/CO/Pt—CeO2/first principles calculation分类
信息技术与安全科学引用本文复制引用
涂杉,冯伟权,张泽,张振宇,周渠..Pt掺杂CeO2对磷酸铁锂电池热失控特征气体CO的吸附与传感机理研究[J].重庆理工大学学报,2024,38(3):314-321,8.基金项目
国网山西省电力公司科技项目(52053023000K) （52053023000K）
