交流--钠离子电池中 2,5-二氧六环羧酸二甲酯助溶剂选择的影响

ECS advances Pub Date : 2024-05-21 DOI:10.1149/2754-2734/ad4e48

Rishivandhiga Jayakumar, V. Shipitsyn, Chanmonirath (Michael) Chak, Wenhua Zuo, Bing Sun, Xiaochuan Lu, Lin Ma

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摘要

研究人员将传统的线性碳酸盐（包括碳酸二甲酯（DMC）、碳酸二乙酯（DEC）和碳酸甲乙酯（EMC））作为共溶剂，用于 Na0.97Ca0.03[Mn0.39Fe0.31Ni0.22Zn0.08]O2（NCMFNZO）/硬碳（HC）袋电池中基于二甲基-2,5-二氧六环羧酸酯（DMOHC）的电解质。含 EMC 的电池显示出卓越的电化学性能，在 4V 和 40°C 下存储 500 小时期间仅出现 1.6 mAh 的不可逆容量损失，并且在 40°C 和 4V 下循环 200 次后仍能保持 80% 以上的容量。所有测试系统都存在严重的气体演化和 Na 电镀问题。

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Communication — The Impact of Co-solvent Selection for Dimethyl-2,5-dioxahexane carboxylate in Sodium Ion Batteries

Traditional linear carbonates including dimethyl carbonate (DMC), diethyl carbonate (DEC), and ethyl methyl carbonate (EMC) were investigated as co-solvents for the dimethyl-2,5-dioxahexane carboxylate (DMOHC)-based electrolyte in Na0.97Ca0.03[Mn0.39Fe0.31Ni0.22Zn0.08]O2 (NCMFNZO)/hard carbon (HC) pouch cells. The EMC-containing cell displays excellent electrochemical performance, exhibiting only a 1.6 mAh irreversible capacity loss during 500 hours of storage at 4V and 40°C, and maintaining over 80% capacity retention after 200 cycles up to 4V at 40°C. Severe gas evolution and Na plating issues are present in all the tested systems.

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ECS advances

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