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Electrochemical performances of KOH activated carbon coated vanadium oxide with sucrose as carbon source for sulfur immobilizers of lithium-sulfur batteries
Sustainable Energy Technologies and Assessments ( IF 8 ) Pub Date : 2020-12-13 , DOI: 10.1016/j.seta.2020.100947
Xiaoshi Lang , Xinxi Wang , YanYan Li , Kedi Cai , Lan Li , Qingguo Zhang

Lithium-sulfur batteries due to high theoretical specific capacity have attracted extensive attention for many years. In this paper, we obtain a type of KOH activated sucrose carbonization coated V2O5 as sulfur immobilizers. X-ray diffraction and Raman spectrum tests illustrate that after carbon coating and sulfur loading, the V2O5 has been transformed into low valence vanadium oxide (VO2) and carbon has a high defect concentration after KOH activated. Scanning electron microscopy observes that the micromorphology of V2O5@C matrix materials with the ratio of V2O5 and sucrose to 1:3 shows a rose-like shape and lamellar thickness can be controlled below 100 nm. And after sulfur loading, the morphology of the original matrix material can still be maintained even at sulfur loading mass ratio to 1:5.

Cyclic voltammetry and electrochemical impedance spectroscopy tests show that this cathode in the proportions of V2O5@C and S to 1:4 has the greatest superb electrochemical reversibility and the fastest electron transport rate. Charge and discharge tests show that the initial specific discharge capacities can respectively achieve to 831.54, 736.95 and 670.00 mAh.g−1 at 0.05, 0.1 and 0.2C current rate and can be stable 100 charge and discharge cycles at 0.2C.



中文翻译:

蔗糖为碳源的KOH活性炭包覆钒氧化物的电化学性能对锂硫电池固硫剂的电化学性能

锂硫电池由于具有较高的理论比容量,多年来引起了广泛的关注。在本文中,我们获得了一种KOH活化的蔗糖碳化涂层的V 2 O 5作为硫固定剂。X射线衍射和拉曼光谱测试表明,在碳涂层和硫负载后,V 2 O 5已转变为低价钒氧化物(VO 2),并且在KOH活化后碳具有高缺陷浓度。扫描电子显微镜观察到,V 2 O 5 @C基体材料的比例为V 2 O 5的微观形貌蔗糖至1:3呈玫瑰状,层状厚度可控制在100nm以下。并且在硫负载后,即使在硫负载质量比为1:5的情况下,仍可以保持原始基质材料的形态。

循环伏安法和电化学阻抗谱测试表明,该阴极在V 2 O 5 @C和S的比例为1:4时具有最大的极好的电化学可逆性和最快的电子传输速率。充电和放电测试表明,在0.05、0.1和0.2C的电流速率下,初始比放电容量可以分别达到831.54、736.95和670.00 mAh.g -1,并且在0.2C下可以稳定100次充电和放电循环。

更新日期:2020-12-14
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