A stable protective layer toward high-performance lithium metal battery
- 200 Downloads
Metal lithium anodes are quite promising for next-generation batteries due to their high energy density and low voltage, which has attracted numerous attention of the researchers. However, the main challenge for lithium anodes still lies on their serious dendrite problems, leading to the poor cycling stabilities. Here, we introduced poly(vinylidene-co-hexafluoropropylene) (PVDF-HFP) composite film combined with nano alumina (nano-Al2O3), lithium fluoride (LiF) and lithiumbis(trifluoromethanesulphonyl)imide (LiTFSI), as a stable protective layer (SPL), to coat on the surface of cooper current collector, which was beneficial to improve the cycling stabilities of the fabricated lithium–copper (Li–Cu) half-cell. The copper foil electrode modified with the protective layer exhibited a much enhanced cycling performance compared with the one without modification, which did not show obvious capacity decay after 250 cycles at the current density of 0.5 mA/cm2 for 2 h. From SEM and XPS characterizations, it had to be found that the preset protective composite layer kept a stable structure during the charge and discharge process, which guaranteed the achieved stable cycling performance. In addition, a full battery system based on modified copper foil anode and LiFePO4 cathode also constructed and presented a good cycling performance.
KeywordsLithium anode Protective layer Cycling performance Cooper foil Batteries
This work was supported by the National Natural Science Foundation of China (Grant No. 51874110 and 51604089), the China Postdoctoral Science Foundation (Grant No. 2016M601431 and 2018T110308), and the Heilongjiang Province Postdoctoral Science Foundation (Grant No. LBH-Z16056 and LBH-TZ1707).
- 4.Guo Y, Li H, Zhai T (2017) Reviving lithium-metal anodes for next-generation high-energy batteries. Adv Mater 29:194–206Google Scholar
- 7.Chen S, Zheng J, Mei D, Han KS, Engelhard MH, Zhao W, Xu W, Liu J, Zhang JG (2018) High-voltage lithium-metal batteries enabled by localized high-concentration electrolytes. Adv Mater 30:1877–1892Google Scholar
- 9.Yue XY, Wang WW, Wang QC, Meng JK, Wang XX, Song Y, Fu ZW, Wu XJ, Zhou YN (2018) Cuprite-coated Cu foam skeleton host enabling lateral growth of lithium dendrites for advanced Li metal batteries. Energy Storage Materials https://doi.org/10.1016/j.ensm.2018.12.007
- 12.Zuo TT, Wu XW, Yang CP, Yin YX, Ye H, Li NW, Guo YG (2017) Graphitized carbon fibers as multifunctional 3D current collectors for high areal capacity Li anodes. Adv Mater 29:764–777Google Scholar
- 14.Li BQ, Chen XR, Chen X, Zhao CX, Zhang R, Cheng XB, Zhang Q (2019) Favorable lithium nucleation on lithiophilic framework porphyrin for dendrite-free lithium metal anodes. Research 2019:1–11Google Scholar
- 15.Luo H, Wang B, Liu T, Jin F, Liu R, Xu CY, Wang CH, Ji KM, Zhou Y, Wang DL, Dou SX (2018) Hierarchical design of hollow Co-Ni LDH nanocages strung by MnO2 nanowire with enhanced pseudocapacitive properties. Energy Storage Materials. https://doi.org/10.1016/j.ensm.2018.10.016
- 23.Liu H, Chen X, Cheng X-B, Li BQ, Zhang R, Wang B, Chen X, Zhang Q (2018) Uniform lithium nucleation guided by atomically dispersed lithiophilic CoNx sites for safe lithium metal batteries. Small Methods. https://doi.org/10.1002/smtd.201800354