The origin of impedance rise in Ni-Rich positive electrodes for lithium-ion batteries

JOURNAL OF POWER SOURCES

卷:498

Article

Lee, Rung-Chuan¹  Franklin, Joseph^1,2  Tian, Chixia^1,3  Nordlund, Dennis⁴  Doeff, Marca¹  Kostecki, Robert¹ 

[1] Lawrence Berkeley Natl Lab, Energy Storage & Distributed Resources Div, 1 Cyclotron Rd, Berkeley, CA 94720 USA

[2] UCL, Dept Chem Engn, Electrochem Innovat Lab, London WC1E 7JE, England

[3] Virginia Tech, Acad Integrated Sci, Blacksburg, VA 24061 USA

[4] SLAC Natl Accelerator Lab, Stanford Synchrotron Radiat Lightsource, Menlo Pk, CA 94035 USA

关键词: Lithium-ion battery;    Ni-rich NMC;    Impedance growth;    Interfacial stability;    Solid electrolyte interphase;   

DOI  :  10.1016/j.jpowsour.2021.229885

来源: Elsevier

【 摘 要 】

The cycling performance of nickel-rich lithium nickel cobalt manganese oxide (NMC) electrodes in Li-ion batteries (LIBs) partially depends on the control of the kinetics of degradation processes that result in impedance rise. The impedance contribution from surface film formation at the NMC/electrolyte interfaces is highly dependent on the initial chemical composition and the structure of the NMC surfaces. Through comparison of film quantity and electrochemical performance of composite electrodes made of pristine- and surface treated-NMC materials, we are able to demonstrate that a simple surface treatment suppressed the subsequent film formation and reduced impedance rise of the Li/NMC half-cells during cycling. Detailed modelling of factors affecting cell impedance provide further insights to index individual interphase resistance, highlighting the underlying positive effects of the proposed surface treatment, and demonstrating the importance of homogeneous, electronically conducting matrices throughout the composite electrode.

【 授权许可】

Free