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Enhanced electrochemical performance of Li 1.2 Mn 0.54 Ni 0.13 Co 0.13 O 2 prepared by using activated carbon as template and carbon source
Ionics ( IF 2.4 ) Pub Date : 2020-05-02 , DOI: 10.1007/s11581-020-03589-3
Xin-Yuan Fu , Ji-Qing Wang , Lu-Lu Zhang , Tao Li , Jing Liu , Xue-Lin Yang

A novel carbon modified Li1.2Mn0.54Ni0.13Co0.13O2 has been successfully fabricated by using activated carbon (AC) as template and carbon source via sol-gel method. The AC modified Li1.2Mn0.54Ni0.13Co0.13O2 (denoted as LLMO@AC) particles with less agglomeration show a nearly spherical structure with a size distribution range of 150~250 nm. As cathode material, such LLMO@AC delivers a significantly enhanced first capacity (245.7 mAh g−1) with a satisfied capacity retention ratio (87.4%) after 100 cycles at 150 mA g−1. Even if the current is increased to 1.5 A g−1, LLMO@AC still owns a high average discharge capacity of 161.1 mAh g−1. Electrochemical impedance spectroscopy results reveal that the LLMO@AC electrode has lower charge transfer resistance and higher lithium-ion diffusion coefficient compared with pristine LLMO and the LLMO synthesized by directly using glucose as carbon sources (LLMO@G). This work provides an effective modification strategy to improve the electrochemical performance of LLMO and promote the industrialization of LLMO.

中文翻译:

以活性炭为模板和碳源制备的Li 1.2 Mn 0.54 Ni 0.13 Co 0.13 O 2的电化学性能增强

以活性炭(AC)为模板,通过溶胶-凝胶法制备碳源,成功制备了新型的碳改性Li 1.2 Mn 0.54 Ni 0.13 Co 0.13 O 2。团聚程度较小的AC改性Li 1.2 Mn 0.54 Ni 0.13 Co 0.13 O 2(表示为LLMO @ AC)颗粒呈近球形,尺寸分布范围为150〜250 nm。作为正极材料,此类LLMO @ AC在150 mA g -1下循环100次后,可显着提高第一容量(245.7 mAh g -1),并具有令人满意的容量保持率(87.4%)。。即使电流增加到1.5 A g -1,LLMO @ AC仍具有161.1 mAh g -1的高平均放电容量。电化学阻抗谱结果表明,与原始LLMO和直接以葡萄糖为碳源(LLMO @ G)合成的LLMO相比,LLMO @ AC电极具有更低的电荷转移电阻和更高的锂离子扩散系数。这项工作为提高LLMO的电化学性能和促进LLMO的产业化提供了有效的修饰策略。
更新日期:2020-05-02
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