کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8948458 | 1645668 | 2018 | 22 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
MnCo2O4 nanospheres for improved lithium storage performance
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
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چکیده انگلیسی
Mesoporous MnCo2O4 nanospheres with an average diameter of approximately 480â¯nm have been synthesized by a polyvinyl pyrrolidone (PVP)-assisted solvothermal method followed by thermal annealing. MnCo2O4 nanospheres consist of many nanoparticles having sizes in range of 20-50â¯nm, the specific area of the sample being 24.4â¯m2 gâ1. When used as the anode material for lithium ion batteries, the mesoporous MnCo2O4 nanospheres show not only an excellent cycling stability, but also an outstanding rate capability. More specially, the discharge capacities of 749.1 and 629.6â¯mAâ¯hâ¯gâ1 can be retained at current densities of 200 and 400â¯mAâ¯gâ1 after 50 cycles, respectively. In addition, the average discharge capacities of 1013.8, 827.1, 770.6, 733.3, 697.3, 651.4 and 522.4â¯mAâ¯hâ¯gâ1 could be observed at current densities of 100, 200, 400, 600, 800, 1000 and 2000â¯mAâ¯gâ1, respectively. The improved cycling stability and rate capability can be ascribed to two unique structural features of mesoporous MnCo2O4 nanospheres: namely, the mesoporous nature of electrode materials which can help to reduce the volume variation during repeated lithiation/delithiation processes, and the nanostructure which can provide a shortened Li+ transmission path. The current synthesis approach can be easily spread to prepare other binary metal oxides, including Co-free anode materials.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ceramics International - Volume 44, Issue 15, 15 October 2018, Pages 17858-17863
Journal: Ceramics International - Volume 44, Issue 15, 15 October 2018, Pages 17858-17863
نویسندگان
Shuangxi Zhou, Xiangwei Luo, Lin Chen, Changjie Xu, Dongliang Yan,