Journal Article

FZJ-2022-02814

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Towards the integration of a silicon/graphite-anode based lithium-ion battery in photovoltaic charging battery systems

Hamzelui, N. ; Kin, L.-C. ; Koehler, J. ; Astakhov, O.FZJ* ; liu, z.FZJ* ; Kirchartz, T.FZJ* ; Rau, U.FZJ* ; Eshetu, G. G. ; Merdzhanova, T.FZJ* ; Figgemeier, E. (Corresponding author)FZJ*

2022
ACS Publications Washington, DC

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Please use a persistent id in citations: http://hdl.handle.net/2128/32049  doi:10.1021/acsomega.2c02940

Abstract: Solar photovoltaic (PV) energy generation is highly dependent on weather conditions and only applicable when the sun is shining during the daytime, leading to a mismatch between demand and supply. Merging PVs with battery storage is the straightforward route to counteract the intermittent nature of solar generation. Capacity (or energy density), overall efficiency, and stability at elevated temperatures are among key battery performance metrics for an integrated PV–battery system. The performance of high-capacity silicon (Si)/graphite (Gr) anode and LiNi0.6Mn0.2Co0.2O2 (NMC622) cathode cells at room temperature, 45, and 60 °C working temperatures for PV modules are explored. The electrochemical performance of both half and full cells are tested using a specially formulated electrolyte, 1 M LiPF6 in ethylene carbonate: diethyl carbonate, with 5 wt % fluoroethylene carbonate, 2 wt % vinylene carbonate, and 1 wt % (2-cyanoethyl)triethoxysilane. To demonstrate solar charging, perovskite solar cells (PSCs) are coupled to the developed batteries, following the evaluation of each device. An overall efficiency of 8.74% under standard PV test conditions is obtained for the PSC charged lithium-ion battery via the direct-current–direct-current converter, showing the promising applicability of silicon/graphite-based anodes in the PV–battery integrated system.

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Contributing Institute(s):

1. Helmholtz-Institut Münster Ionenleiter für Energiespeicher (IEK-12)
2. Photovoltaik (IEK-5)

Research Program(s):

1. 1214 - Modules, stability, performance and specific applications (POF4-121) (POF4-121)

Appears in the scientific report 2022

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