There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality.

Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …

I and i

An Overview on the Advances of LiCoO 2 Cathodes for Lithium‐Ion Batteries

https://www.zenodo.org/record/2642457/files/A%20review%20on%20various%20temperature-indication%20methods%20for%20Li-ion%20batteries.pdf

A review on various temperature-indication methods for Li-ion batteries

Electrochemical impedance spectroscopy (EIS) is widely used to probe the physical and chemical processes in lithium (Li)-ion batteries (LiBs). The key parameters include state-of-charge, rate capacity or power fade, degradation and temperature dependence, which are needed to inform battery management systems as well as for quality assurance and monitoring. All-solid-state batteries using a solid-state electrolyte (SE), promise greater energy densities via a Li metal anode as well as enhanced safety, but their development is in its nascent stages and the EIS measurement, cell set-up and modelling approach can be vastly different for various SE chemistries and cell configurations. This review aims to condense the current knowledge of EIS in the context of state-of-the-art solid-state electrolytes and batteries, with a view to advancing their scale-up from the laboratory to commercial deployment. Experimental and modelling best practices are highlighted, as well as emerging impedance methods for conventional LiBs as a guide for opportunities in the solid-state.

Electrochemical Impedance Spectroscopy for All-Solid-State Batteries: Theory, Methods and Future Outlook

In liquid electrolyte-type lithium-ion batteries, Nickel-rich NCM (Li$_{1+x }$(Ni$_{1−y−z}$Co$_{ y}$Mnz)$_{1−x}$O$_{2}$) as cathode active material allows for high discharge capacities and good material utilization, while solid-state batteries perform worse despite the past efforts in improving solid electrolyte conductivity and stability. In this work, we identify major reasons for this discrepancy by investigating the lithium transport kinetics in NCM-811 as typical Ni-rich material. During the first charge of battery half-cells, cracks form and are filled by the liquid electrolyte distributing inside the secondary particles of NCM. This drastically improves both the lithium chemical diffusion and charge transfer kinetics by increasing the electrochemically active surface area and reducing the effective particle size. Solid-state batteries are not affected by these cracks because of the mechanical rigidity of solid electrolytes. Hence, secondary particle cracking improves the initial charge and discharge kinetics of NCM in liquid electrolytes, while it degrades the corresponding kinetics in solid electrolytes. Accounting for these kinetic limitations by combining galvanostatic and potentiostatic discharge, we show that Coulombic efficiencies of about 89% at discharge capacities of about 173 mAh g$_{1+x }$NCM$^{-1}$ can be reached in solid-state battery half-cells with LiNi$_{0.8}$Co$_{0.1}$Mn$_{0.1}$O$_{2}$ as cathode active material and Li$_{6}$PS$_{5}$Cl as solid electrolyte.

/pdf/influence-of-ncm-particle-cracking-on-kinetics-of-lithium-8a8jv2nmlk.pdf

Influence of NCM Particle Cracking on Kinetics of Lithium-Ion Batteries with Liquid or Solid Electrolyte

Effective thermal management and tracking of battery degradation are two key challenges in the improved management of battery packs. Entropy change measurement is a non-destructive tool for characterizing both the thermal and structural properties of lithium batteries. However, conventional entropy measurements based on discontinuous potentiometric methods are too time-consuming for practical implementation in battery packs. We present a comprehensive review of potentiometric methods for the entropy change measurement of lithium batteries. We compare conventional and improved discontinuous methods as well as a fully continuous method. Entropy measurements were then made using all the techniques for a solid-state microbattery using a bespoke test system utilising Peltier elements for rapid temperature control. The trade-off between accuracy and speed for the different methods is discussed in detail. In conclusion, the improved discontinuous measurement with significantly reduced voltage relaxation time is recommended for the determination of entropy change during the lithiation/delithiation intercalation reaction in lithium batteries.

Potentiometric measurement of entropy change for lithium batteries

Solid-state lithium batteries could reduce the safety concern due to thermal runaway while improving the gravimetric and volumetric energy density beyond the existing practical limits of lithium-ion batteries. The successful commercialisation of solid-state lithium batteries depends on understanding and addressing the bottlenecks limiting the cell performance under realistic operational conditions such as dynamic current profiles of different pulse amplitudes. This study focuses on experimental analysis and continuum modelling of cell behaviour under pulse operating conditions, with most model parameters estimated from experimental measurements. By using a combined impedance and distribution of relaxation times analysis, we show that charge transfer at both interfaces occurs between the microseconds and milliseconds timescale. We also demonstrate that a simplified set of governing equations, rather than the conventional Poisson–Nernst–Planck equations, are sufficient to reproduce the experimentally observed behaviour during pulse discharge, pulse charging and dynamic pulse. Our simulation results suggest that solid diffusion in bulk LiCoO2 is the performance limiting mechanism under pulse operating conditions, with increasing voltage loss for lower states of charge. If bulk electrode forms the positive electrode, improvement in the ionic conductivity of the solid electrolyte beyond 10−4 S cm−1 yields marginal overall performance gains due to this solid diffusion limitation. Instead of further increasing the electrode thickness or improving the ionic conductivity on their own, we propose a holistic model-based approach to cell design, in order to achieve optimum performance for known operating conditions.

Experimental and numerical analysis to identify the performance limiting mechanisms in solid-state lithium cells under pulse operating conditions

The degradation phenomena of thin-film solid state batteries caused by cycling at a high cut-off voltage and different temperatures were studied using an improved potentiometric measurement of entropy change combined with electrochemical impedance analysis and incremental capacity analysis. Entropy profiling is demonstrated as a viable non-destructive technique for solid state batteries that is sensitive to structural changes in electrodes during galvanostatic cycling, and is complementary to other techniques for studying degradation. The characteristic peaks and valleys in the entropy profile as a function of the state-of-charge could be closely correlated to theories of phase transitions in the cathode material. This technique is therefore a useful technique to help understand and diagnose the degradation mechanism, and specify the state-of-health in a promising new battery technology.

Degradation of thin-film lithium batteries characterised by improved potentiometric measurement of entropy change.

The invention discloses a preparation method of a metal matrix solid-state thin-film lithium battery cathode with an interface modification layer. According to the method, a solid-state thin-film lithium battery cathode part with the interface modification layer within a certain thickness range is formed between a metal substrate and a cathode active material layer; and chemical reaction of the interface modification layer is accompanied in the annealing crystallization process of the cathode active material layer, so that element distribution, a microstructure and electrochemical properties between the metal substrate and the cathode active material layer are changed; the effect of improving the electrochemical properties of a solid-state thin-film lithium battery is achieved; and the good interface modification layer has the effects that the internal resistance of the battery is reduced, the battery capacity is improved, the adhesive force of the substrate and the cathode active material layer is strengthened and the influence to the performance of the cathode active material layer caused by harmful elements of the substrate through diffusion is relieved.

Preparation method of metal matrix solid-state thin-film lithium battery cathode with interface modification layer

The invention belongs to the technical field of manufacturing of lithium ion batteries, and relates to a treatment method of a stainless steel base material for a film lithium battery. The treatment method is characterized by comprising the steps of: material selection; roller machining; heat treatment; oxidative acid corrosion; and non-oxidative acid solution treatment. By adopting the treatment method of the stainless steel base material for the film lithium battery provided by the invention, the stainless steel base material has heat resistance and flexibility, the film adhesion of the base material is increased, the film is prevented from falling off, the diffusion of lithium molecules in high-temperature treatment is reduced, the energy density of the film lithium battery is increased, and the cost of the lithium battery is lowered.

Treatment method of stainless steel base material for film lithium battery

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