Redox Species-Based Electrolytes for Advanced Rechargeable Lithium Ion Batteries

Type
Article

Authors
Ming, Jun
Li, Mengliu
Kumar, Pushpendra
Lu, Ang-Yu
Wahyudi, Wandi
Li, Lain-Jong

KAUST Department
Material Science and Engineering Program
Physical Science and Engineering (PSE) Division

Online Publication Date
2016-08-16

Print Publication Date
2016-09-09

Date
2016-08-16

Abstract
Seeking high-capacity cathodes has become an intensive effort in lithium ion battery research; however, the low energy density still remains a major issue for sustainable handheld devices and vehicles. Herein, we present a new strategy of integrating a redox species-based electrolyte in batteries to boost their performance. Taking the olivine LiFePO4-based battery as an example, the incorporation of redox species (i.e., polysulfide of Li2S8) in the electrolyte results in much lower polarization and superior stability, where the dissociated Li+/Sx2– can significantly speed up the lithium diffusion. More importantly, the presence of the S82–/S2– redox reaction further contributes extra capacity, making a completely new LiFePO4/Li2Sx hybrid battery with a high energy density of 1124 Wh kgcathode–1 and a capacity of 442 mAh gcathode–1. The marriage of appropriate redox species in an electrolyte for a rechargeable battery is an efficient and scalable approach for obtaining higher energy density storage devices.

Citation
Ming J, Li M, Kumar P, Lu A-Y, Wahyudi W, et al. (2016) Redox Species-Based Electrolytes for Advanced Rechargeable Lithium Ion Batteries. ACS Energy Letters 1: 529–534. Available: http://dx.doi.org/10.1021/acsenergylett.6b00274.

Acknowledgements
The research was supported by KAUST.

Publisher
American Chemical Society (ACS)

Journal
ACS Energy Letters

DOI
10.1021/acsenergylett.6b00274

Additional Links
http://pubs.acs.org/doi/abs/10.1021/acsenergylett.6b00274

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