An effective approach to improve electrochemical performance of thick electrodes | |
Song, Kaifang2,3; Li, Wenjie3; Chen, Zhan3; Wu, Xiangkun3; Zhou, Qian1; Snyder, Kent1; Zhang, Lan2,3 | |
刊名 | IONICS |
2021-01-19 | |
页码 | 10 |
关键词 | Lithium-ion Battery Dual-layered Structure Conductive Agent Areal Loading Thick Electrode |
ISSN号 | 0947-7047 |
DOI | 10.1007/s11581-021-03912-6 |
英文摘要 | Increasing areal active material loading by thick electrodes is a direct and effective approach to improve the energy density of lithium-ion batteries (LIBs). However, it may also induce large polarization effects and reduce the active material utilization, especially under high charge/discharge current densities. In this work, dual-layered LiNi0.8Co0.15Al0.05O2 (NCA) cathodes with high areal capacity of about 5 mAh/cm(2) and gradient porosity are prepared via a layer-by-layer method, in which carbon nanotubes (CNTs) and Super P (SP) carbon are used to build the electron conducting networks as well as to adjust the porosity. It is demonstrated that the CNT-SP cathode, which uses CNTs as the conductive agent in the lower layer (close to the current collector) and SP as the conductive agent in the upper layer (close to the separator), provides the highest areal capacity of 4.81 mAh/cm(2) among all configurations studied (CNT-SP, SP-SP, SP-CNT, and CNT-CNT). And it exhibits high capacity retention of 99.5% over 100 cycles in NCA||graphite full pouch cells at current density of 0.2 C rate. The excellent performance of the thick CNT-SP cathode is attributed to the construction of favorable conductive networks which can provide effective and reliable paths for electron transport and Li+ diffusion. Moreover, a thinner electrode/electrolyte interphase layer is found to form in the CNT-SP electrode. This research reveals a viable approach for ameliorating the significant polarization effects and limited active material utilization in thick electrodes through alternate configurations of the conductive agents, which can be easily adopted in state-of-the-art battery manufacturing processes. |
资助项目 | National Key Research and Development Program of China[2019YFA0705600] ; National Natural Science Foundation of China[21706261] ; National Natural Science Foundation of China[21706262] ; Henan province science and technology cooperation project[182106000022] ; Ford University Research Program |
WOS研究方向 | Chemistry ; Electrochemistry ; Physics |
语种 | 英语 |
出版者 | SPRINGER HEIDELBERG |
WOS记录号 | WOS:000609122000002 |
资助机构 | National Key Research and Development Program of China ; National Natural Science Foundation of China ; Henan province science and technology cooperation project ; Ford University Research Program |
内容类型 | 期刊论文 |
源URL | [http://ir.ipe.ac.cn/handle/122111/43335] |
专题 | 中国科学院过程工程研究所 |
通讯作者 | Wu, Xiangkun; Zhang, Lan |
作者单位 | 1.Ford Motor Co, Electrificat Subsyst & Power Supply, Dearborn, MI 48121 USA 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Inst Proc Engn, Beijing Key Lab Ion Liquids Clean Proc, Key Lab Green Proc & Engn, Beijing 100190, Peoples R China |
推荐引用方式 GB/T 7714 | Song, Kaifang,Li, Wenjie,Chen, Zhan,et al. An effective approach to improve electrochemical performance of thick electrodes[J]. IONICS,2021:10. |
APA | Song, Kaifang.,Li, Wenjie.,Chen, Zhan.,Wu, Xiangkun.,Zhou, Qian.,...&Zhang, Lan.(2021).An effective approach to improve electrochemical performance of thick electrodes.IONICS,10. |
MLA | Song, Kaifang,et al."An effective approach to improve electrochemical performance of thick electrodes".IONICS (2021):10. |
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