Lithium heterogeneities in cylinder-type Li-ion batteries - fatigue induced by cycling

JOURNAL OF POWER SOURCES

卷:448

Article

Petz, D.¹  Muehlbauer, M. J.^1,2,3  Baran, V.¹  Frost, M.⁴  Schoekel, A.⁵  Paulmann, C.^5,6  Chen, Y.⁴  Garces, D.^1,7  Senyshyn, A.¹ 

[1] Tech Univ Munich, Heinz Maier Leibnitz Zentrum MLZ, Lichtenbergstr 1, D-85748 Garching, Germany

[2] Helmholtz Inst Ulm Electrochem Energy Storage HIU, POB 3640, D-76021 Karlsruhe, Germany

[3] KIT, IAM, Hermann von Hebnholtz Pl 1, D-76344 Eggenstein Leopoldshafen, Germany

[4] Oak Ridge Natl Lab, Neutron Scattering Div, Spallat Neutron Source, Oak Ridge, TN 37830 USA

[5] Deutsch Elektronen Synchrotron DESK, Notkestr 85, D-22607 Hamburg, Germany

[6] Univ Hamburg, Mineral Petrog Inst, Grindelallee 48, D-20146 Hamburg, Germany

[7] CNEA INN, Ctr Atom Constituyentes, B1650, San Martin, Kna, Argentina

关键词: Li-ion batteries;    18650;    Type;    Time-of-flight neutron powder diffraction;    Synchrotron radiation;    X-ray diffraction radiography;   

DOI  :  10.1016/j.jpowsour.2019.227466

来源: Elsevier

【 摘 要 】

Integrity and uniformity are crucial factors for stable, safe, robust and well-predicted operation of Li-ion batteries. The uniformity of lithium distribution in the graphite anode in fully charged state was studied by a combination of spatially-resolved time-of-flight neutron diffraction, powder diffraction using synchrotron radiation and electrochemical measurements. Studies were carried out on a series of NCA/C Li-ion cells of 18650-type with various cycle numbers. Experimentally obtained lithium distribution under in operando and ex situ conditions have been found in fair agreement and revealed a non-uniform character of lithiation in the graphite anode in charged state, where the degree of heterogeneity increases with the number of cycles.

【 授权许可】

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