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CNT/PVDF Composite Coating Layer on Cu with a Synergy of Uniform Current Distribution and Stress Releasing for Improving Reversible Li Plating/Stripping

Guo, Qiang; Yu, Yanan; Xia, Shengjie; Shen, Cai; Hu, Di; Deng, Wei; Dong, Daojie; Zhou, Xufeng; Chen, George Zheng; Liu, Zhaoping

CNT/PVDF Composite Coating Layer on Cu with a Synergy of Uniform Current Distribution and Stress Releasing for Improving Reversible Li Plating/Stripping Thumbnail


Authors

Qiang Guo

Yanan Yu

Shengjie Xia

Cai Shen

Di Hu

Wei Deng

Daojie Dong

Xufeng Zhou

Zhaoping Liu



Abstract

The uncontrollable formation of polymorphous Li deposits, e.g., whiskers, mosses, or dendrites resulting from nonuniform interfacial current distribution and internal stress release in the upward direction on the conventional current collector (e.g., Cu foil) of Li metal rechargeable batteries with a lithium-metal-free negatrode (LMFRBs), leads to rapid performance degradation or serious safety problems. The 3D carbon nanotubes (CNTs) skeleton has been proven to effectively reduce the current density and eliminate the internal accumulated stress. However, remarkable electrolyte decomposition, inherent Li source consumption due to repeated SEI formation, and Li+ intercalation in CNTs limit the application of 3D CNTs skeleton. Thus, it is necessary to avoid the side effects of the 3D CNTs skeleton and retain uniform interfacial current distribution and stress mitigation. In this work, we integrate the CNTs network with a soft functional polymer polyvinylidene fluoride (PVDF) to form a relatively dense coating layer on Cu foil, which can shield the contact between the internal surface of the 3D CNTs framework and the electrolyte. Simultaneously, the Li-F-rich SEI resulting from the partial reduction of PVDF with deposited Li and the soft nature of the coating layer release the accumulation of internal stress in the horizontal direction, resulting in mosses/whisker-free Li deposition. Thus, improved Li deposition/dissolution and stable cycling performance of the LMFRBs can be achieved.

Citation

Guo, Q., Yu, Y., Xia, S., Shen, C., Hu, D., Deng, W., …Liu, Z. (2022). CNT/PVDF Composite Coating Layer on Cu with a Synergy of Uniform Current Distribution and Stress Releasing for Improving Reversible Li Plating/Stripping. ACS Applied Materials and Interfaces, https://doi.org/10.1021/acsami.2c13193

Journal Article Type Article
Acceptance Date Sep 19, 2022
Online Publication Date Sep 29, 2022
Publication Date Sep 29, 2022
Deposit Date Oct 3, 2022
Publicly Available Date Sep 30, 2023
Journal ACS Applied Materials and Interfaces
Print ISSN 1944-8244
Electronic ISSN 1944-8252
Publisher American Chemical Society (ACS)
Peer Reviewed Peer Reviewed
DOI https://doi.org/10.1021/acsami.2c13193
Keywords General Materials Science
Public URL https://nottingham-repository.worktribe.com/output/11755959
Publisher URL https://pubs.acs.org/doi/10.1021/acsami.2c13193
Additional Information This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Applied Materials and Interfaces, after peer review and technical editing by the publisher. To access the final edited and published work see https://pubs.acs.org/doi/10.1021/acsami.2c13193

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