journal article·2020-06-12

A Nonflammable Electrolyte Enabled High Performance K0.5MnO2 Cathode for Low-Cost Potassium-Ion Batteries

Leqing Deng, Tianshuai Wang, Youran Hong, Meiying Feng, Ruiting Wang, Juan Zhang, Qianfan Zhang, Jiangwei Wang, Liang Zeng, Yujie Zhu, Lin Guo

ACS Energy Letters· Volume 5· Issue 6
Publisher page

Abstract

The application of a layered K0.5MnO2 cathode in potassium-ion batteries is limited by its poor cycling performance when charged above 4.0 V (vs K+/K), and the underlying mechanism for this electrochemical instability is still unclear. Here, it is discovered that ethylene carbonate (EC) will intercalate into the depotassiated K0.5MnO2, causing the exfoliation of the layered compound and the capacity decay under high charge cutoff voltage. When the carbonates are replaced with a nonflammable phosphate, the electrochemical performance of K0.5MnO2 above 4.0 V (vs K+/K) is significantly enhanced with a large reversible capacity (120 mAh g–1) and high capacity retention of 84% after 400 cycles. This phosphate-based electrolyte also demonstrates good compatibility with the commercial graphite anode, enabling the encouraging electrochemical performance of the K0.5MnO2|graphite full-cell. The present study provides new insights on further exploration of other electrolytes to advance the emerging low-cost and high-performance potassium-ion batteries.
Source: openalex_inverted_index · Quality: baseline

Research context

OpenAlex topics: Advancements in Battery Materials · Advanced Battery Materials and Technologies · Supercapacitor Materials and Fabrication

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

School of Chemistry, Beihang University, Beijing 100191, P.R. China

School of Physics, Beihang University, Beijing 100191, P.R. China

School of Materials Science and Engineering, Beihang University, Beijing 100191, P.R. China

Center of Electron Microscopy and State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, P.R. China

Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, P.R. China

Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, Beijing 100191, P.R. China

Funding

Beihang University · China Postdoctoral Science Foundation · National Natural Science Foundation of China · Central Committee of the Communist Party of China

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