Photonic methods for rapid crystallization of LiMn2O4 cathodes for solid-state thin-film batteries

Chen, Xubin; Sastre, Jordi; Rumpel, Matthias; Flegler, Andreas; Singhania, Anurag; Bonner, Javier Balta; Hoffmann, P.; Romanyuk, Yaroslav E.

doi:10.1016/j.jpowsour.2020.229424

Cited by 15 publications

(7 citation statements)

References 29 publications

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“…Experimental time-resolved photoluminescence (TRPL) lifetimes tend to decrease, which in turn may limit the diffusion lengths and exacerbate the J SC degradation for devices suffering from collection issues 10 . The magnitude of the LS effects appears to depend on extrinsic elements such as Na [11][12][13] and other heavier alkali 3,14 . The doping increase tends to be most effective when the device is maintained in open-circuit condition during treatment, and to a lower extent in short-circuit 12,14 .…”

Section: Introductionmentioning

confidence: 99%

Heat-light soaking treatments for high-performance CIGS solar cells on flexible substrates

Carron¹,

Nishiwaki²,

Yang

et al. 2022

Preprint

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Cu(In,Ga)Se2 (CIGS) solar cells are sensitive to heat-light soaking (HLS) treatments performed at elevated temperatures. Such treatments often result in improved open-circuit voltage at the expense of short-circuit current and/or fill factor, and may be reversible. In this contribution, we analyze the changes brought in the devices by heat and light treatments to CIGS, to deliver hints regarding the fundamental reasons behind the observed changes and to ensure the long-term stability of the performance improvement. We apply HLS treatments to improve the performance of low-temperature grown CIGS solar cells on flexible polyimide and on glass substrates. We first investigate the treatment conditions favorable for device performances. A gain in open-circuit voltage is obtained, with no clear statistical impact on short-circuit current and fill factor. The changes are stable over periods of several months. Then we combine material analysis techniques to optoelectronic and electrical characterization on samples subject to a unique HLS treatment at the optimal conditions. The voltage gain arises from a large increase in the doping density in the absorber layer, correlated with increased concentrations of alkali elements Na and Rb. This improvement is partly offset by a reduction in minority charge carrier lifetime. The microscopic origin for the observed changes is discussed. At low temperatures, we also measure device enhancement due to the front interface behavior, however with unclear impact on standard operating conditions. The HLS treatment yielded a CIGS solar cell with certified record 21.4% power conversion efficiency on a flexible substrate.

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Section: Introductionmentioning

confidence: 99%

Heat-light soaking treatments for high-performance CIGS solar cells on flexible substrates

Carron¹,

Nishiwaki²,

Yang

et al. 2022

Preprint

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“…Several innovations are required: i) Depending on whether high energy or high power is desired, the cathode thickness must be increased to up to tens of μm; ii) The cathode must be crystallized to maximize capacity but without degradation of the other layers. This may be achieved by rapid thermal annealing, 30 photonic annealing methods, 31 or the use of cathodes such as vanadates with low annealing temperatures; 32 iii) The number of stacked cells must ideally be increased up to 10; iv) The development of stacked thin-film cells in an anode-free design, e.g., by thin seed layers of gold or carbon. 27,33 When all these points are met, we expect -11 -stacked thin-film batteries to reach specific energies >400 Wh•kg -1 and specific powers >10 kW•kg -1 .…”

Section: Discussionmentioning

confidence: 99%

Monolithically-stacked thin-film solid-state batteries

Futscher

Brinkman

Müller

et al. 2023

Preprint

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The power capability of Li-ion batteries has become increasingly limiting for the electrification of transport on land and in the air. The specific power of Li-ion batteries is restricted to a few thousand W/kg due to the required cathode thickness of a few tens of micrometers. We present a new design of monolithically-stacked thin-film cells that has the potential to increase the power ten-fold. We demonstrate an experimental proof-of-concept consisting of two monolithically stacked thin-film cells. Each cell consists of a silicon anode, a solid-oxide electrolyte, and a lithium cobalt oxide cathode. The battery can be cycled for more than 300 cycles between 6 and 8 V. Using a thermo-electric model, we predict that stacked thin-film batteries can achieve specific energies >250 Wh/kg at C-rates above 60, resulting in a specific power of tens of kW/kg needed for high-end mobile applications such as drones, robots, and eVTOLs.

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“…Vertically aligned oxygen-deficient α-MoO 3−x nanoflake arrays were reported as cathode material for thin-film batteries with LiPON as the electrolyte, which shows better performance than the 2D cathode owing to the larger electrode/electrolyte interface area and shorter Li + ion diffusion pathway [41]. Chen et al investigated the photonic methods for fast crystallization of LMO cathode in LiPON-based thin-film batteries, among which the xenon flash-lamp annealing is a promising technique for preparing high electrochemical performance electrode [42]. They also used the same method to prepare LCO cathode on Al foil to fabricate flexible thin-film batteries [43].…”

Section: Future Perspectivesmentioning

confidence: 99%

All-solid-state thin-film batteries based on lithium phosphorus oxynitrides

Dai

Qiao

et al. 2022

Mater. Futures

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Lithium phosphorus oxynitride (LiPON) has been widely used as the solid-state electrolyte for all-solid-state thin-film battery (ASSTFB) since firstly synthesized in 1992 due to its outstanding electrochemical and mechanical properties. This review summarizes the research and progress in ASSTFBs based on LiPON. Various LiPON-derivatives with adjustable chemical compositions of the amorphous structure have been developed to improve the ionic conductivity and electrochemical stability, they are detailed in this review. The investigations on the interface between LiPON/electrodes to perfect the overall properties of ASSTFBs are summarized. All kinds of physical and chemical preparation methods for LiPON with different characteristics are also described.

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Photonic methods for rapid crystallization of LiMn2O4 cathodes for solid-state thin-film batteries

Cited by 15 publications

References 29 publications

Heat-light soaking treatments for high-performance CIGS solar cells on flexible substrates

Heat-light soaking treatments for high-performance CIGS solar cells on flexible substrates

Monolithically-stacked thin-film solid-state batteries

All-solid-state thin-film batteries based on lithium phosphorus oxynitrides

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