Health & Environmental Research Online (HERO)


Print Feedback Export to File
6932764 
Journal Article 
Electrochemically manipulating the redox state of 2,2 ',5,5 '-tetrahydroxybiphenyl as a new organic Li-rich cathode for Li-ion batteries 
Yu, Q; Yao, Z; Shi, J; Tang, Wu; Wang, C; Li, Di; Fan, C; , 
2020 
1 
Organic Electronics
ISSN: 1566-1199 
ELSEVIER 
AMSTERDAM 
WOS:000529350400017 
For the first time, a small organic molecule of 2,2',5,5'-tetrahydroxybiphenyl (BP4OH) is synthesized as a new organic cathode for Li-ion batteries. After setting reduction in the 1st cycle in Li-ion half cells (reduction -> oxidation), BP4OH can be in-situ transformed to its salt of lithium 2,2'-bis[benzene-1,4-bis(olate)] (BP4OLi) on Al foil. The resulting BP4OLi is a Li-rich organic cathode and exhibits very good cell performance. For example, the average capacity of similar to 155 mAh g(-1) for the BP4OLi electrode is realized during 600 cycles (500 mA g(-1)). On the other hand, after setting oxidation in the 1st cycle (oxidation -> reduction), BP4OH can be in-situ tuned to its oxidized state of 2,2'-bis(1,4-benzoquinone) (BBQ). Interestingly, the resulting BBQ can be still redox-active and show satisfactory cell performance. For instance, the average capacity of similar to 101 mAh g(-1) for the BBQ electrode can be obtained for 600 cycles (500 mA g(-1)). This work reveals very interesting redox behaviors of organic electrodes.