材料科学
石墨烯
电解质
电化学
化学工程
催化作用
兴奋剂
复合数
退火(玻璃)
纳米技术
锂(药物)
电极
复合材料
光电子学
有机化学
物理化学
化学
医学
内分泌学
工程类
作者
Wei Zhong,Siwu Li,Mengchuang Liu,Qiang Wu,Ziqi Zeng,Shijie Cheng,Jia Xie
出处
期刊:Nano Energy
[Elsevier]
日期:2023-10-01
卷期号:115: 108757-108757
被引量:10
标识
DOI:10.1016/j.nanoen.2023.108757
摘要
The self-sacrificing Li2C2O4 is a promising lithium replenisher benefiting from its high specific capacity, residue-free and low-cost properties. However, the intrinsic low electrochemical activity leads to a decomposition potential up to 4.7 V, posing a challenge for the compatibility of electrolyte and cathode materials. Herein, a three-dimensional (3D) hierarchical spherical Mo2C/N-doped graphene co-catalysts is synthesized by self-polymerization and high-temperature annealing. It is shown that the synergistic catalytic effect of Mo2C and N-doped activated graphene enhances the reactivity of Li2C2O4 and the hierarchical three-dimensional conducting network accelerates the electron-ion transport. When the nano-Li2C2O4 is homogeneously encapsulated in the spherical catalytic center using a freeze-drying technique, the electrochemical reaction of Li2C2O4 is greatly promoted, resulting a significant drop of decomposition potential from 4.7 V to 4.16 V. As a result, the specific capacity of Gr||LFP and SiC||LFP full cells with composite lithium replenisher can be increased by 15% and 22%, respectively. Moreover, the solid electrolyte interface (SEI) is appropriately strengthened with pre-lithiation and thus guarantees superior cycling performance.
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