FeS2‐Imbedded Mixed Conducting Matrix as a Solid Battery Cathode. Issue 15 (6th June 2016)

• Record Type: Journal Article
• Authors: Whiteley, Justin M.; Hafner, Simon; Han, Sang Sub; Kim, Seul Cham; Oh, Kyu Hwan; Lee, Se‐Hee
• Is Part Of: Advanced energy materials. Volume 6:Issue 15(2016)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2016-06-06
• Subjects: mixed conductors -- pyrite -- solid‐state batteries -- Tafel analysis -- titanium disulfide; Energy harvesting -- Materials -- Periodicals; Energy conversion -- Materials -- Periodicals; Energy storage -- Materials -- Periodicals; Photovoltaics -- Periodicals; Fuel cells -- Periodicals; Thermoelectric materials -- Periodicals; 621.31
• DOI: 10.1002/aenm.201600495
• Languages: English
• ISSNs: 1614-6832

Abstract

Abstract : A new concept of pairing an active material and a mixed conductor is explored as a solid‐state battery electrode. By imbedding nano‐FeS2 domains into an amorphous LiTiS2 matrix, a hybrid power‐energy system is achieved while additionally improving upon many common solid electrode design flaws. High‐resolution transmission electron microscopy is used to probe the active material/mixed conductor interface over the course of cycling. Arguably the most beneficial development is enhancement of charge transfer, manifesting in a significantly increased exchange current as captured in a Tafel analysis. By developing a solution to active material isolation and creating a more homogenous electrode design, cycling at a high rate of C/2 for 500 cycles is obtained. Additionally, the electrode can recover full capacity simply by reducing system rate. Capacity recovery implicates a lack of active material isolation, a common problem in solid‐state batteries. Abstract : A new concept of pairing an active material and a mixed conductor is explored as a solid‐state battery electrode. By imbedding nano‐FeS2 domains into an amorphous LiTiS2 matrix, a hybrid power‐energy system is achieved. The new cathode retains 62% capacity after 500 cycles at C/2 but also can recover full capacity once rate is reduced.