材料科学
锂(药物)
量子点
离子
电容器
碳纤维
多面体
纳米技术
化学工程
复合材料
复合数
电气工程
有机化学
医学
化学
几何学
数学
工程类
电压
内分泌学
作者
Shani Li,Yanan Xu,Xudong Zhang,Yang Guo,Yibo Ma,Xianzhong Sun,Xiong Zhang,Puqi Ning,Kai Wang,Yanwei Ma
标识
DOI:10.1002/adfm.202314870
摘要
Abstract Phosphides with high theoretical capacity are considered ideal anode materials for lithium‐ion capacitors (LICs), but poor electronic conductivity as well as unsatisfied cyclic stability limits the performance of the phosphides. Here a covalently bonded CoP@C heterostructure is reported, which consists of 5 nm CoP quantum dots (QDs) like pomegranate seeds pinned in carbon polyhedron through interfacial Co─P─C bonding. The ultrafine size of CoP QDs provides more reactive sites and a shorten electrons/ions diffusion path, boosting the specific capacity. The Co─P─C bond induces the energy band variation of CoP and increases the interfacial charge density, bringing about fast kinetics. Besides, the Co─P─C bond introduces a robust pining effect among CoP QDs and carbon polyhedra, greatly improving the structure stability of 5 nm CoP QDs. The CoP@C heterostructure electrode exhibits high capacity (nearly 1000 mAh g −1 ) and superior cycling stability. It is worth noting that a prototyped LIC full‐cell of YP80//CoP@C presents an impressive high energy density of 172 Wh kg −1 and a power density of 10.8 kW kg −1 . Moreover, the LIC possesses an ultra‐long life, retaining 80% after 20,000 cycles. This study offers an effective design for phosphides achieving fast kinetics and superior structure stability through an interfacial bonding approach.
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