Lu Yong, Hou Xuesen, Miao Licheng, Li Lin, Shi Ruijuan, Liu Luojia, Chen Jun
Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Renewable Energy Conversion and Storage Center, College of Chemistry, Nankai University, Tianjin, 300071, China.
Angew Chem Int Ed Engl. 2019 May 20;58(21):7020-7024. doi: 10.1002/anie.201902185. Epub 2019 Apr 17.
Organic carbonyl compounds show potential as cathode materials for lithium-ion batteries (LIBs) but the limited capacities (<600 mA h g ) and high solubility in electrolyte restrict their further applications. Herein we report the synthesis and application of cyclohexanehexone (C O ), which exhibits an ultrahigh capacity of 902 mA h g with an average voltage of 1.7 V at 20 mA g in LIBs (corresponding to a high energy density of 1533 Wh kg ). A preliminary cycling test shows that C O displays a capacity retention of 82 % after 100 cycles at 50 mA g because of the limited solubility in high-polarity ionic liquid electrolyte. Furthermore, the combination of DFT calculations and experimental techniques, such as Raman and IR spectroscopy, demonstrates the electrochemical active C=O groups during discharge and charge processes.
有机羰基化合物作为锂离子电池（LIBs）的阴极材料具有潜力，但容量有限（<600 mA h g）且在电解质中的高溶解度限制了它们的进一步应用。在此，我们报告了环己烷六酮（C₆O₆）的合成与应用，其在LIBs中以20 mA g的电流密度表现出902 mA h g的超高容量，平均电压为1.7 V（对应于1533 Wh kg的高能量密度）。初步循环测试表明，由于在高极性离子液体电解质中的溶解度有限，C₆O₆在50 mA g的电流密度下循环100次后容量保持率为82%。此外，密度泛函理论（DFT）计算与拉曼光谱和红外光谱等实验技术相结合，证明了在充放电过程中电化学活性的C=O基团。
