首页|异氰酸酯抑制LiTFSI电解液铝集流体腐蚀研究

异氰酸酯抑制LiTFSI电解液铝集流体腐蚀研究

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商用锂电池普遍采用六氟磷酸锂(LiPF6)电解液,但其热稳定性差、易水解.相比之下,双三氟甲烷磺酰亚胺锂(LiTFSI)热稳定性好、不易水解,有望替代LiPF6.然而,LiTFSI电解液对集流体铝箔腐蚀,阻碍了其大规模实际应用.通过添加适量异佛尔酮二异氰酸酯(IPDI),有效解决了上述问题.研究表明,IPDI能够在铝集流体表面生成氮化铝(A1N)保护层,有效地抑制LiTFSI电解液对铝箔的腐蚀.同时,IPDI的引入可有效提高电解液的氧化稳定性,拓宽电化学窗口.此外,添加适量IPDI可改善LiTFSI电解液与锂金属的兼容性,抑制锂枝晶生长,提高Li/Cu沉积剥离库伦效率(CE).更重要的是,IPDI的引入显著提升锂电池的循环性能和倍率性能,Li/LiFePO4电池充放电循环400圈,容量保持率高达98％.本工作为抑制LiTFSI电解液对铝箔的腐蚀提供了新的设计思路和研究方向,能够促进LiTFSI电解液的实际应用.
Isocyanate Inhibits the Corrosion of Aluminum Current Collector
Lithium hexafluorophosphate(LiPF6)electrolyte is widely used in commercial lithium batter-ies,but it has poor thermal stability and is easy to hydrolyze.In contrast,Lithium bis(trifluoromethylsul-phonyl)imide(LiTFSI)has good thermal stability and is stable to hydrolysis,which is expected to replace LiPF6.However,the corrosion of current collector aluminum foil by LiTFSI electrolyte hinders its large-scale practical application.In this paper,the above problems were effectively solved by adding an appropri-ate amount of isophorone diisocyanate(IPDI).The results show that IPDI can form a protective layer of aluminum nitride(AIN)on the surface of aluminum current collector,which effectively inhibits the corro-sion of aluminum foil by LiTFSI electrolyte.At the same time,the introduction of IPDI effectively im-proves the oxidation stability of the electrolyte and expands the electrochemical window.In addition,the ap-propriate amount of IPDI improves the compatibility of LiTFSI electrolyte with lithium metal,inhibits lithium dendrites,and improves the stripping coulombic efficiency(CE)of Li/Cu deposition.More impor-tantly,the introduction of IPDI significantly improves the cycle performance and rate performance of lithium batteries.The capacity retention rate of Li/LiFePO4 battery is as high as 98％after 400 cycles.This work provides a new design idea and research direction for inhibiting the corrosion of aluminum foil.

Lithium batteryIsocyanateLithium bis(trifluoromethylsulphonyl)imideAluminum foilCorrosion

周静、王青磊、马奔、李晨阳、许梦霞、王淑渝、苏丽、上官雪慧、李法强

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临沂大学化学化工学院,山东临沂 276000

临沂大学材料科学与工程学院,山东临沂 276000

锂电池 异氰酸酯 双三氟甲烷磺酰亚胺锂 铝箔 腐蚀

国家自然科学基金山东省自然科学基金山东省自然科学基金山东省自然科学基金山东省高等学校青年创新团队人才引育计划临沂大学博士人才科研启动基金临沂大学大学生创新创业训练计划临沂大学大学生创新创业训练计划临沂大学大学生创新创业训练计划临沂大学大学生创新创业训练计划临沂市重点研发项目临沂大学校级教学改革项目

22209065ZR2021QE039ZR2021QE149ZR2020MB082鲁教科函[2021]51号40621022S202310452150X202310452296X202310452510X2023104525112021019zktJG2022M41

2024

10.12119/j.yhyj.202402001

盐湖研究
中国科学院青海盐湖研究所

盐湖研究

CSTPCD
影响因子：0.319
ISSN：1008-858X
年,卷(期)：2024.32(2)
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