Hollow porous carbon spheres doped with a low content of Co3O4 as anode materials for high performance lithium-ion batteries
Hollow porous carbon spheres doped with a low content of Co3O4 as anode materials for high performance lithium-ion batteries
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低含量Co3O4掺杂的空心多孔碳球作为高性能锂离子电池负极材料
DOI：
10.1016/j.electacta.2019.06.027
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发表时间：
2019-09-10
影响因子：
6.6
通讯作者：
Geng, Baoyou
中科院分区：
文献类型：
--
作者：
Yu, Mengkang;Sun, Yixuan;Geng, Baoyou
传统的碳材料和过渡金属氧化物因其各自的优势被认为是锂离子电池负极材料的最佳候选者。本文结合碳和过渡金属氧化物的优点，以硝酸钴和葡萄糖为前驱体，通过简单的喷雾热解法制备了Co 3 O 4掺杂的中空分级多孔碳球。空心多孔球的壁厚可以通过硝酸钴和葡萄糖的比例来调节。电化学测试结果表明，当葡萄糖与硝酸钴的摩尔比为6：8时，在0.2A g（-1）下循环200次后，该光学产物的放电容量仍保持在1297.1mAh g（-1）。此外，该样品在1 A g（-1）下循环300次后的放电比容量为841.0 mAh g（-1）。中空分级多孔结构可以有效地减少锂离子的传输路径，合适的壁厚可以支持充放电过程中的体积变化。该产品具有上级充放电容量大、含碳量高、产率高、成本低等优点，是一种很有前途的锂离子电池负极材料。(c)2019爱思唯尔有限公司版权所有。
Traditional carbon materials and transition metal oxides are considered as the best candidates due to their respective advantages for the anode materials of lithium ion batteries. Herein, combining the advantages of carbon and transition metal oxides, we fabricate Co3O4 doped hollow hierarchical porous carbon spheres through a simple spray pyrolysis route with cobalt nitrate and glucose as precursors. The wall thickness of hollow porous spheres can be adjusted through the ratio between cobalt nitrate and glucose. The results of electrochemical test show that the optical product maintains an excellent discharge capacity of 1297.1 mAh g(-1) after 200 cycles at 0.2 A g(-1) when the molar ratio of glucose and cobalt nitrate is 6:8. In addition, the sample has a discharge specific capacity of 841.0 mAh g(-1) after 300 cycles at 1 A g(-1). Hollow hierarchical porous structure can efficiently reduce the path of lithium ion transport, and a suitable wall thickness can support the volume change during charge and discharge. Superior charge/discharge capacity, high carbon content, high yield and low cost turn this product into a more promising anode material for lithium-ion batteries. (c) 2019 Elsevier Ltd. All rights reserved.