CAS OpenIR
An effective approach to improve electrochemical performance of thick electrodes
Song, Kaifang1,2; Li, Wenjie1; Chen, Zhan1; Wu, Xiangkun1; Zhou, Qian3; Snyder, Kent3; Zhang, Lan1,2
2021-01-19
Source PublicationIONICS
ISSN0947-7047
Pages10
Abstract

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.

KeywordLithium-ion Battery Dual-layered Structure Conductive Agent Areal Loading Thick Electrode
DOI10.1007/s11581-021-03912-6
Language英语
Funding ProjectNational 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 Research AreaChemistry ; Electrochemistry ; Physics
WOS SubjectChemistry, Physical ; Electrochemistry ; Physics, Condensed Matter
Funding OrganizationNational Key Research and Development Program of China ; National Natural Science Foundation of China ; Henan province science and technology cooperation project ; Ford University Research Program
WOS IDWOS:000609122000002
PublisherSPRINGER HEIDELBERG
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/43336
Collection中国科学院过程工程研究所
Corresponding AuthorWu, Xiangkun; Zhang, Lan
Affiliation1.Chinese Acad Sci, Inst Proc Engn, Beijing Key Lab Ion Liquids Clean Proc, Key Lab Green Proc & Engn, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Ford Motor Co, Electrificat Subsyst & Power Supply, Dearborn, MI 48121 USA
Recommended Citation
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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