期刊
ADVANCED MATERIALS
卷 29, 期 47, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201703882
关键词
aluminum foil; anti-corrosion; current collectors; graphene; lithium-ion batteries
类别
资金
- Beijing Municipal Science & Technology Commission [Z161100002116002, Z161100002116021]
- National Basic Research Program of China [2014CB932500, 2016YFA0200101]
- National Natural Science Foundation of China [21525310, 51432002, 51502007, 51520105003]
- National Program for Support of Top-Notch Young Professionals
Aluminum (Al) foil, as the most accepted cathode current collector for lithium-ion batteries (LIBs), is susceptible to local anodic corrosions during long-term operations. Such corrosions could lead to the deterioration or even premature failure of the batteries and are generally believed to be a bottleneck for next-generation 5 V LIBs. Here, it is demonstrated that Al foil armored by conformal graphene coating exhibits significantly reinforced anodic corrosion resistance in both LiPF6 and lithium bis(trifluoromethanesulphonyl) imide (LiTFSI) based electrolytes. Moreover, LiMn2O4 cells using graphene-armored Al foil as current collectors (LMO/GA) demonstrate enhanced electrochemical performance in comparison with those using pristine Al foil (LMO/PA). The long-term discharge capacity retention of LMO/GA cell after approximate to 950 h straight operations at low rate (0.5 C) reaches up to 91%, remarkably superior to LMO/PA cell (75%). The self-discharge propensity of LMO/GA is clearly relieved and the rate/power performance is also improved with graphene mediations. This work not only contributes to the long-term stable operations of LIBs but also might catalyze the deployment of 5 V LIBs in the future.
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