Enhancement of the Electrochemical Performances of Composite Solid-State Electrolytes by Doping with Graphene
With high safety and good flexibility, polymer-based composite solid electrolytes are considered to be promising electrolytes and are widely investigated in solid lithium batteries. However, the low conductivity and high interfacial impedance of polymer-based solid electrolytes hinder their industri...
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| Format: | Article |
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MDPI AG
2022-09-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/12/18/3216 |
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| author | Xinghua Liang Dongxue Huang Linxiao Lan Guanhua Yang Jianling Huang |
| author_facet | Xinghua Liang Dongxue Huang Linxiao Lan Guanhua Yang Jianling Huang |
| author_sort | Xinghua Liang |
| collection | DOAJ |
| description | With high safety and good flexibility, polymer-based composite solid electrolytes are considered to be promising electrolytes and are widely investigated in solid lithium batteries. However, the low conductivity and high interfacial impedance of polymer-based solid electrolytes hinder their industrial applications. Herein, a composite solid-state electrolyte containing graphene (PVDF-LATP-LiClO4-Graphene) with structurally stable and good electrochemical performance is explored and enables excellent electrochemical properties for lithium-ion batteries. The ionic conductivity of the composite electrolyte membrane containing 5 wt% graphene reaches 2.00 × 10<sup>−3</sup> S cm<sup>−1</sup> at 25 °C, which is higher than that of the composite electrolyte membrane without graphene (2.67 × 10<sup>−4</sup> S cm<sup>−1</sup>). The electrochemical window of the composite electrolyte membrane containing 5 wt% graphene reaches 4.6 V, and its Li<sup>+</sup> transference numbers reach 0.84. Assembling this electrolyte into the battery, the LFP/PVDF-LATP-LiClO4-Graphene /Li battery has a specific discharge capacity of 107 mAh g<sup>−1</sup> at 0.2 C, and the capacity retention rate was 91.58% after 100 cycles, higher than that of the LiFePO<sub>4</sub>/PVDF-LATP-LiClO<sub>4</sub>/Li (LFP/PLL/Li) battery, being 94 mAh g<sup>−1</sup> and 89.36%, respectively. This work provides a feasible solution for the potential application of composite solid electrolytes. |
| first_indexed | 2024-03-09T22:58:21Z |
| format | Article |
| id | doaj.art-997f3c8bf6014802aefb5689c4b08f8c |
| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-03-09T22:58:21Z |
| publishDate | 2022-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Nanomaterials |
| spelling | doaj.art-997f3c8bf6014802aefb5689c4b08f8c2023-11-23T18:07:32ZengMDPI AGNanomaterials2079-49912022-09-011218321610.3390/nano12183216Enhancement of the Electrochemical Performances of Composite Solid-State Electrolytes by Doping with GrapheneXinghua Liang0Dongxue Huang1Linxiao Lan2Guanhua Yang3Jianling Huang4Guangxi Key Laboratory of Automobile Components and Vehicle Technology, Guangxi University of Science and Technology, Liuzhou 545006, ChinaGuangxi Key Laboratory of Automobile Components and Vehicle Technology, Guangxi University of Science and Technology, Liuzhou 545006, ChinaGuangxi Key Laboratory of Automobile Components and Vehicle Technology, Guangxi University of Science and Technology, Liuzhou 545006, ChinaGuangxi Key Laboratory of Automobile Components and Vehicle Technology, Guangxi University of Science and Technology, Liuzhou 545006, ChinaGuangxi Key Laboratory of Automobile Components and Vehicle Technology, Guangxi University of Science and Technology, Liuzhou 545006, ChinaWith high safety and good flexibility, polymer-based composite solid electrolytes are considered to be promising electrolytes and are widely investigated in solid lithium batteries. However, the low conductivity and high interfacial impedance of polymer-based solid electrolytes hinder their industrial applications. Herein, a composite solid-state electrolyte containing graphene (PVDF-LATP-LiClO4-Graphene) with structurally stable and good electrochemical performance is explored and enables excellent electrochemical properties for lithium-ion batteries. The ionic conductivity of the composite electrolyte membrane containing 5 wt% graphene reaches 2.00 × 10<sup>−3</sup> S cm<sup>−1</sup> at 25 °C, which is higher than that of the composite electrolyte membrane without graphene (2.67 × 10<sup>−4</sup> S cm<sup>−1</sup>). The electrochemical window of the composite electrolyte membrane containing 5 wt% graphene reaches 4.6 V, and its Li<sup>+</sup> transference numbers reach 0.84. Assembling this electrolyte into the battery, the LFP/PVDF-LATP-LiClO4-Graphene /Li battery has a specific discharge capacity of 107 mAh g<sup>−1</sup> at 0.2 C, and the capacity retention rate was 91.58% after 100 cycles, higher than that of the LiFePO<sub>4</sub>/PVDF-LATP-LiClO<sub>4</sub>/Li (LFP/PLL/Li) battery, being 94 mAh g<sup>−1</sup> and 89.36%, respectively. This work provides a feasible solution for the potential application of composite solid electrolytes.https://www.mdpi.com/2079-4991/12/18/3216lithium-ion batteriescomposite solid electrolytegrapheneelectrochemical performance |
| spellingShingle | Xinghua Liang Dongxue Huang Linxiao Lan Guanhua Yang Jianling Huang Enhancement of the Electrochemical Performances of Composite Solid-State Electrolytes by Doping with Graphene Nanomaterials lithium-ion batteries composite solid electrolyte graphene electrochemical performance |
| title | Enhancement of the Electrochemical Performances of Composite Solid-State Electrolytes by Doping with Graphene |
| title_full | Enhancement of the Electrochemical Performances of Composite Solid-State Electrolytes by Doping with Graphene |
| title_fullStr | Enhancement of the Electrochemical Performances of Composite Solid-State Electrolytes by Doping with Graphene |
| title_full_unstemmed | Enhancement of the Electrochemical Performances of Composite Solid-State Electrolytes by Doping with Graphene |
| title_short | Enhancement of the Electrochemical Performances of Composite Solid-State Electrolytes by Doping with Graphene |
| title_sort | enhancement of the electrochemical performances of composite solid state electrolytes by doping with graphene |
| topic | lithium-ion batteries composite solid electrolyte graphene electrochemical performance |
| url | https://www.mdpi.com/2079-4991/12/18/3216 |
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