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Energy Storage Science and Technology ›› 2021, Vol. 10 ›› Issue (6): 2069-2076.doi: 10.19799/j.cnki.2095-4239.2021.0160
• Energy Storage Materials and Devices • Previous Articles Next Articles
Preparation and properties of polyvinylidene fluoride/polyvinylidene fluoride sulfonate lithium/lithium salt composite solid electrolyte
Yue SU1(
), Xuhua LIU1, Fanglei ZENG1,2, Yurong REN1,2, Bencai LIN1,2(
)
- 1.School of Materials Science and Engineering, Changzhou University2.Jiangsu Collaborative Innovation Center of Photovolatic Science and Engineering, Changzhou University, Changzhou 213164, Jiangsu, China
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54Knowledge
0Abstract
Abstract:
Single-ion polymer electrolytes were recently developed and used in solid-state batteries. In single-ion polymer electrolytes, anions are attached to the main chain of polymers, and only lithium ions are allowed to pass through into the electrolyte. As a result, the single-ion polymer electrolytes had a high lithium-ion migration number, which will be beneficial in reducing the concentration polarization of lithium batteries. However, the low ion conductivity of single-ion polymer electrolytes limits their application in lithium batteries. In the present work, chlorosulfonic acid, polyvinylidene fluoride (PVDF), and lithium hydroxide were used to prepare sulfonated polyvinylidene fluoride (SPVDF) and polyvinylidene fluoride sulfonate lithium (SPVDFLi). The chemical structures of PVDF and SPVDF were confirmed by the 1H nuclear magnetic resonance spectra. A series of single-ion polymer electrolytes (SIPEx) were prepared by a solvent casting method from PVDF and SPVDFLi mixture solution. To improve the electrolyte's ion conductivity, PVDF/SPVDFLi/LiTFSI composite electrolytes (SPVDFLi/LiTFSI-y) were created by varying the amount of LiTFSI in the SIPE. The ion conductivity of SIPEs increased by increasing the content of SPVDFLi. The ion conductivity of PVDF/SPVDFLi/LiTFSI composite electrolytes further increased by increasing the content of LiTFSI, SPVDFLi/LiTFSI-40 showed the conductivity of 1.41×10-4 S/cm at 25 ℃, the steady voltage of up to 4.84 V, and the capacity retention rate of is 99.1% after 50 cycles at 0.2 C, because of its high conductivity, high lithium-ion migration number, and high efficiency in inhibiting the growth of lithium dendrites SPVDFLi, the excellent lithium-ion battery assembled with SPVDFLi/LiTFSI-40. These findings suggest that the PVDF/SPVDFLi/LiTFSI composite electrolytes will be used to create high-performance solid-state lithium-ion batteries.
Key words: polymer composite electrolytes, polyvinylidene fluoride sulfonate lithium, conductivity, lithium-ion migration number
CLC Number:
-
TM 912
Cite this article
Yue SU, Xuhua LIU, Fanglei ZENG, Yurong REN, Bencai LIN. Preparation and properties of polyvinylidene fluoride/polyvinylidene fluoride sulfonate lithium/lithium salt composite solid electrolyte[J]. Energy Storage Science and Technology, 2021, 10(6): 2069-2076.
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URL: https://esst.cip.com.cn/EN/10.19799/j.cnki.2095-4239.2021.0160
https://esst.cip.com.cn/EN/Y2021/V10/I6/2069
Figures/Tables 8
Fig. 1
Synthesis of SPVDFLi"
Fig. 1 Fig. 2
1H NMR spectra of PVDF and SPVDF"
Fig. 2 Fig. 3
(a) the conductivity of SPVDFLi-x varies with temperature, (b) the conductivity of SPVDFLi/LiTFSI-y and PVDF/LiTFSI varies with temperature"
Fig. 3 Table 1
Lithium ion migration number of various SPEs"
| 样品 | I0/mA | ISS/mA | R0/Ω | RSS/Ω | tLi+ |
|---|---|---|---|---|---|
| SPVDFLi-60 | 0.26 | 0.21 | 410 | 420 | 0.78 |
| SPDVDFLi/LiTFSI-40 | 0.95 | 0.62 | 75 | 88 | 0.68 |
| PVDF/LiTFSI | 3.30 | 1.70 | 650 | 700 | 0.47 |
Table 2
Tensile strength, Young's modulus and elongation at break of various SPEs"
| 样品 | 拉伸强度/MPa | 杨氏模量/MPa | 断裂伸长率/% |
|---|---|---|---|
| SPVDFLi-60 | 2.3±0.3 | 13.7±0.6 | 23.0±0.2 |
| SPVDFLi/LiTFSI-10 | 3.1±0.5 | 29.5±0.2 | 25.8±0.5 |
| SPVDFLi/LiTFSI-20 | 4.0±0.2 | 14.8±0.9 | 33.7±0.4 |
| SPVDFLi/LiTFSI-30 | 3.0±0.1 | 12.7±0.4 | 35.1±0.7 |
| SPVDFLi/LiTFSI-40 | 4.2±0.2 | 16.5±0.3 | 56.5±0.1 |
| PVDF/LiTFSI | 8.0±0.4 | 55.2±0.2 | 35.8±0.2 |
Fig. 4
Linear scanning voltammetry curves of various SPEs"
Fig. 4 Fig. 5
Galvanostatic cycling performance of symmetric Li/SPE/Li cells with PVDF/LiTFSI and SPVDFLi/LiTFSI-40 at room temperature (a), SEM images of the surface of the fresh Li anode (b), Li anode surface after 273 h with PVDF/LiTFSI (c) and Li anode surface after 334 h with SPVDFLi/LiTFSI-40"
Fig. 5 Fig. 6
Long-term cycling stability (a) and rate performance of the cell with SPVDFLi/LiTFSI-40"
Fig. 6 References 23
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