Reduced Graphene Oxide-Coated Separator to Activate Dead Potassium for Efficient Potassium Batteries
Potassium (K) metal batteries (KMBs) have the advantages of relatively low electric potential (−2.93 V), high specific capacity (687 mAh g<sup>−1</sup>), and low cost, which are highly appealing to manufacturers of portable electric products and vehicles. However, the large amounts of “d...
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| Format: | Article |
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MDPI AG
2022-08-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/15/16/5505 |
| _version_ | 1797443855757344768 |
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| author | Liping Si Jianyi Wang Xijun Xu |
| author_facet | Liping Si Jianyi Wang Xijun Xu |
| author_sort | Liping Si |
| collection | DOAJ |
| description | Potassium (K) metal batteries (KMBs) have the advantages of relatively low electric potential (−2.93 V), high specific capacity (687 mAh g<sup>−1</sup>), and low cost, which are highly appealing to manufacturers of portable electric products and vehicles. However, the large amounts of “dead K” caused by K dendrite growth and volumetric expansion can cause severe K metal anode deactivation. Here, a thin layer of conductive reduced graphene oxide (rGO) was coated on a GF separator (rGO@GF) to activate the generated dead K. Compared with the batteries adopting an original separator, those adopting a modified separator have significantly improved specific capacity and cycling stability. The life of full-cell of KMBs combining an rGO@GF separator with synthesized K<sub>0.51</sub>V<sub>2</sub>O<sub>5</sub> is expected to exceed 400 cycles, with an initial capacity of 92 mAh g<sup>−1</sup> at 0.5 A g<sup>−1</sup> and an attenuation rate per cycle as low as 0.03%. Our work demonstrates that a composite separator of high conductivity is beneficial for high performance KMBs. |
| first_indexed | 2024-03-09T13:03:07Z |
| format | Article |
| id | doaj.art-be7b37fa270e4982b47441b1a75ecd75 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-09T13:03:07Z |
| publishDate | 2022-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-be7b37fa270e4982b47441b1a75ecd752023-11-30T21:52:13ZengMDPI AGMaterials1996-19442022-08-011516550510.3390/ma15165505Reduced Graphene Oxide-Coated Separator to Activate Dead Potassium for Efficient Potassium BatteriesLiping Si0Jianyi Wang1Xijun Xu2School of Materials Science and Hydrogen Energy, Foshan University, Foshan 528000, ChinaSchool of Materials Science and Hydrogen Energy, Foshan University, Foshan 528000, ChinaSchool of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, ChinaPotassium (K) metal batteries (KMBs) have the advantages of relatively low electric potential (−2.93 V), high specific capacity (687 mAh g<sup>−1</sup>), and low cost, which are highly appealing to manufacturers of portable electric products and vehicles. However, the large amounts of “dead K” caused by K dendrite growth and volumetric expansion can cause severe K metal anode deactivation. Here, a thin layer of conductive reduced graphene oxide (rGO) was coated on a GF separator (rGO@GF) to activate the generated dead K. Compared with the batteries adopting an original separator, those adopting a modified separator have significantly improved specific capacity and cycling stability. The life of full-cell of KMBs combining an rGO@GF separator with synthesized K<sub>0.51</sub>V<sub>2</sub>O<sub>5</sub> is expected to exceed 400 cycles, with an initial capacity of 92 mAh g<sup>−1</sup> at 0.5 A g<sup>−1</sup> and an attenuation rate per cycle as low as 0.03%. Our work demonstrates that a composite separator of high conductivity is beneficial for high performance KMBs.https://www.mdpi.com/1996-1944/15/16/5505separatorreduced graphene oxidepotassium metal batteriesdead K |
| spellingShingle | Liping Si Jianyi Wang Xijun Xu Reduced Graphene Oxide-Coated Separator to Activate Dead Potassium for Efficient Potassium Batteries Materials separator reduced graphene oxide potassium metal batteries dead K |
| title | Reduced Graphene Oxide-Coated Separator to Activate Dead Potassium for Efficient Potassium Batteries |
| title_full | Reduced Graphene Oxide-Coated Separator to Activate Dead Potassium for Efficient Potassium Batteries |
| title_fullStr | Reduced Graphene Oxide-Coated Separator to Activate Dead Potassium for Efficient Potassium Batteries |
| title_full_unstemmed | Reduced Graphene Oxide-Coated Separator to Activate Dead Potassium for Efficient Potassium Batteries |
| title_short | Reduced Graphene Oxide-Coated Separator to Activate Dead Potassium for Efficient Potassium Batteries |
| title_sort | reduced graphene oxide coated separator to activate dead potassium for efficient potassium batteries |
| topic | separator reduced graphene oxide potassium metal batteries dead K |
| url | https://www.mdpi.com/1996-1944/15/16/5505 |
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