Urchin-type architecture assembled by cobalt phosphide nanorods encapsulated in graphene framework as an advanced anode for alkali metal ion batteries.
Urchin-type architecture assembled by cobalt phosphide nanorods encapsulated in graphene framework as an advanced anode for alkali metal ion batteries.
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DOI：
10.1002/chem.202003261
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发表时间：
2020-11
期刊：
影响因子：
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通讯作者：
Jiamei Wang;Gang Zhu;Zelei Zhang;Yi Wang;Hui Wang;J. Bai;Gang Wang
中科院分区：
文献类型：
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作者：
Jiamei Wang;Gang Zhu;Zelei Zhang;Yi Wang;Hui Wang;J. Bai;Gang Wang
将纳米棒组装的海胆型磷化钴微粒封装在石墨烯骨架膜（CoP@GF）中，用作碱金属离子电池的无粘结剂电极。电化学测量表明，这种膜具有增强的可逆锂，钠和钾的存储能力。在碱金属离子电池中，CoP@GF电极的储能性能表现为Li > Na > K。密度泛函理论（DFT）计算了CoP表面对Li、Na和K的吸附能，结果表明CoP表面比Na和K更有利于电子向Li原子的转移，表面活性大小为Li-CoP > Na-CoP > K-CoP，CoP@GF对Li具有更好的存储容量.本工作为了解磷化钴基膜在碱金属离子电池中的电化学性能提供了实验和理论依据。
Urchin-type cobalt phosphide microparticles assembled by nanorod is encapsulated in graphene framework membrane (CoP@GF), and used as a binder-free electrode for alkali metal ion batteries. Electrochemical measurements indicate that this membrane exhibits enhanced reversible lithium, sodium, and potassium storage capabilities. Moreover, the energy storage properties of CoP@GF electrodes in alkali metal ion batteries display an order of Li > Na > K. DFT calculations on adsorption energy of CoP surfaces for Li, Na, and K indicated that CoP surfaces is more favorable to transfer electrons to Li atoms than Na and K, and the surface reactivity can be ordered as Li-CoP > Na-CoP > K-CoP, thus CoP@GF exhibit better storage capacity for lithium. This work provides experimental and theoretical basis for understand the electrochemical performance of cobalt phosphide-based membrane for alkali metal ion batteries.