Academic Journal
A facile approach to nanoarchitectured three-dimensional graphene-based Li–Mn–O composite as high-power cathodes for Li-ion batteries
| العنوان: | A facile approach to nanoarchitectured three-dimensional graphene-based Li–Mn–O composite as high-power cathodes for Li-ion batteries |
|---|---|
| المؤلفون: | Wenyu Zhang, Yi Zeng, Chen Xu, Ni Xiao, Yiben Gao, Lain-Jong Li, Xiaodong Chen, Huey Hoon Hng, Qingyu Yan |
| المصدر: | Beilstein Journal of Nanotechnology, Vol 3, Iss 1, Pp 513-523 (2012) |
| بيانات النشر: | Beilstein-Institut, 2012. |
| سنة النشر: | 2012 |
| المجموعة: | LCC:Technology LCC:Chemical technology LCC:Science LCC:Physics |
| مصطلحات موضوعية: | cathode, graphene, Li-ion battery, lithium manganate, Technology, Chemical technology, TP1-1185, Science, Physics, QC1-999 |
| الوصف: | We report a facile method to prepare a nanoarchitectured lithium manganate/graphene (LMO/G) hybrid as a positive electrode for Li-ion batteries. The Mn2O3/graphene hybrid is synthesized by exfoliation of graphene sheets and deposition of Mn2O3 in a one-step electrochemical process, which is followed by lithiation in a molten salt reaction. There are several advantages of using the LMO/G as cathodes in Li-ion batteries: (1) the LMO/G electrode shows high specific capacities at high gravimetric current densities with excellent cycling stability, e.g., 84 mAh·g−1 during the 500th cycle at a discharge current density of 5625 mA·g−1 (~38.01 C capacity rating) in the voltage window of 3–4.5 V; (2) the LMO/G hybrid can buffer the Jahn–Teller effect, which depicts excellent Li storage properties at high current densities within a wider voltage window of 2–4.5 V, e.g., 93 mAh·g−1 during the 300th cycle at a discharge current density of 5625 mA·g−1 (~38.01 C). The wider operation voltage window can lead to increased theoretical capacity, e.g., 148 mAh·g−1 between 3 and 4.5 V and 296 mAh·g−1 between 2 and 4.5 V; (3) more importantly, it is found that the attachment of LMO onto graphene can help to reduce the dissolution of Mn2+ into the electrolyte, as indicated by the inductively coupled plasma (ICP) measurements, and which is mainly attributed to the large specific surface area of the graphene sheets. |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English |
| تدمد: | 2190-4286 |
| Relation: | https://doaj.org/toc/2190-4286 |
| DOI: | 10.3762/bjnano.3.59 |
| URL الوصول: | https://doaj.org/article/52c9aecba99444a2b53c3ead2431bce1 |
| رقم الانضمام: | edsdoj.52c9aecba99444a2b53c3ead2431bce1 |
| قاعدة البيانات: | Directory of Open Access Journals |
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