Structural regulation chemistry of lithium-ion solvation in nonflammable phosphate-based electrolytes for high interfacial compatibility with graphite anode

作     者：Chenyang Shi Xinjing Huang Jiahao Gu Zeyu Huang Fangyan Liu Mengran Wang Qiyu Wang Bo Hong Zhian Zhang Jie Li Yanqing Lai Chenyang Shi;Xinjing Huang;Jiahao Gu;Zeyu Huang;Fangyan Liu;Mengran Wang;Qiyu Wang;Bo Hong;Zhian Zhang;Jie Li;Yanqing Lai

作者机构：School of Metallurgy and EnvironmentCentral South UniversityChangsha 410083HunanChina Engineering Research Centre of Advanced Battery MaterialsThe Ministry of EducationChangsha 410083HunanChina Hunan Province Key Laboratory of Nonferrous Value-Added MetallurgyCentral South UniversityChangsha 410083HunanChina Powder Metallurgy Research InstituteState Key Laboratory of Powder MetallurgyCentral South UniversityChangsha 410083HunanChina 

出 版 物：《Journal of Energy Chemistry》 (能源化学（英文版）)

年 卷 期：2023年第87卷第12期

页      面：501-508,I0013页

核心收录：

学科分类：0808[工学-电气工程] 081704[工学-应用化学] 08[工学] 0817[工学-化学工程与技术] 

基　　金：the National Natural Science Foundation of China(52034011 and 52101278) the Central South University Research Programme of Advanced Interdisciplinary Studies(2023QYJC005) the Fundamental Research Funds for Central Universities of the Central South University(2022ZZTS0405) 

主　　题：Ethylene carbonate Triethyl phosphate Solvation structure Non-flammable electrolyte 

摘      要：With the booming development of lithium-ion batteries,safety has become one of the most primary focuses of current *** there are various approaches to enhance the safety of lithiumion batteries,phosphate-based electrolyte holds the greatest potential for practical application due to their ***,its compatibility issue with the graphite anode remains a significant obstacle to its widespread ***,an effective method is proposed to improve the compatibility of electrolyte with graphite(Gr)anode by rationally adjusting the proportion of lithium salt and solvent components to optimize the Li^(+)solvation *** slightly increasing the Li^(+)/triethyl phosphate(TEP)ratio,TEP alone cannot fully occupy the inner solvation sheath and therefore less polar ethylene carbonate(EC)has to be recruited,and the solvation structure gradually changes from Li^(+)–[TEP]_(4)to Li^(+)–[TEP]_(3)[EC]with the coexistence of EC and ***,EC molecules in the Li^(+)–[TEP]_(3)[EC]could be preferentially reduced on graphite compared to the TEP molecules,resulting in the formation of a uniform and durable solid-electrolyte interphase(SEI)*** from the optimized phosphate-based electrolyte,the Gr|Li battery exhibits a capacity retention rate of 96.8%after stable cycling at 0.5 C for 470 cycles which shows a longer cycle life than the battery with carbonate electrolyte(cycling at 0.5 C for 450 cycles).Therefore,this work provides the guidance for designing a non-flammable phosphate-based electrolyte for high-safety and long cycling-life lithium-ion batteries.