Batteries & Supercaps最新文献

The electrolyte filling and subsequent wetting of the active material is a time-critical process in the manufacturing of lithium-ion batteries. Due to the metallic cell housing, the process phenomena are insufficiently accessible, preventing the replication of the wetting processes by mathematical or simulative methods and hindering efforts to accelerate the wetting process. Therefore, this publication employs a glass cell housing for electrolyte filling of a 21700 cylindrical cell to investigate the wetting at different temperatures and process pressures. In parallel, a mathematical replication of the wetting, as well as a lattice Boltzmann pore-scale simulation, is used to evaluate the influence of these varying process boundary conditions. The results show a strong temperature dependence on electrolyte wetting and the positive effect of pressure changes in the wetting process. These findings are particularly relevant to the process design of large-scale cylindrical cell manufacturing.

The Cover Feature showcases the diverse applications of Prussian Blue analogue (PBA)–based post-lithium batteries (PLBs). The circles on the left of the battery depict their current use in supporting the transition to clean energy. The circles on the right highlight potential future industries that PBA-based PLBs could transform, including aerospace, electronics, and mobility applications. The development of PBA cathodes is poised to be a significant breakthrough in enhancing PLBs, unlocking a wide array of applications. More information can be found in the Review by J. D. Ocon and co-workers (DOI: 10.1002/batt.202400280).

In this work, we have designed an all-organic and all-solid-state lithium metal battery based on 7,7,8,8-tetracyano-p-quinodimethane (TCNQ) as the organic electroactive material and a COF (Covalent Organic Framework)/PEO (PolyEthylene Oxide) composite as solid electrolyte. The use of a solid electrolyte allows fixing the solubility problem of organic electroactive materials in classical liquid electrolytes. This is the first time an all-solid-state organic battery based on TCNQ versus lithium metal is reported, since no liquid additive was included in the formulation of the electrolyte. We obtained a reversible capacity of 88 mAh g⁻¹ at the second discharge, and still 58 mAh g⁻¹ at the tenth discharge. The redox processes were investigated by X-ray Photoelectron Spectroscopy (XPS). We could evidence the involvement of the two lithiation steps of TCNQ (LiTCNQ and Li₂TCNQ) in the reversible capacity. Optimization of the electrode manufacturing and formulation, and replacing the salt (LiI) by alternative ones opens the door to future improvements in the electrochemical performances. This study demonstrates the interest of COF-type organic structures in the formulation of organic solid electrolytes.

The Front Cover illustrates an ethanol solution phase–synthesized sulfide solid electrolyte with a characteristic core–shell structure; it produces a suitable functionalized interface at the sulfide solid electrolyte/cathode active material interface for all-solid-state batteries (ASSBs). This study is expected to provide fundamental and industrial insights for the practical implementation of ASSBs. More information can be found in the Research Article by Y. Morino and co-workers (DOI: 10.1002/batt.202400264).

The Cover Feature illustrates lithium-ion battery degradation. It demonstrates how individual aging modes—the loss of accessible active material from an electrode or the depletion of cyclable lithium ions—affect the capacities and balancing between the electrodes. These changes are visualized by color-coded surfaces that represent electrode potentials in the full cell′s cyclation window, transitioning from green to red to indicate degradation. Such alterations lead to a measurable capacity fade and changes in the full cell′s potential curve, as depicted by the differential voltage curve. The underlying work combines this mechanistic model with a data-driven model approach of the individual aging modes to predict both capacity fade and changes to the potential curve under various aging conditions. This will help to enhance understanding and prediction of battery degradation and can be the basis for a more precise onboard state-of-charge and state-of-health estimation of degraded batteries. More information can be found in the Research Article by J. Stadler and co-workers (DOI: 10.1002/batt.202400211).

Sodium-ion batteries (SIBs) have demonstrated significant potential as alternatives to conventional lithium-ion batteries (LIBs) for modern grid and mobile energy storage applications, due to the abundant natural resources and low cost of sodium. Layered transition metal oxides (LTMOs) have attracted much attention due to their high specific capacities, energy densities as well as the compatible preparation processes with those of LIBs cathode materials. Among these, Ni/Mn-based LTMOs (NMLOs) are particularly noteworthy for their cost-effectiveness and superior electrochemical performance, such as excellent capacity retention, voltage stability, high operating voltage and rate capability. In this review, we briefly introduce the synthesis methods of NMLOs, discuss the challenges, and summarize the solutions. The insights presented may contribute to the development of NMLOs based SIBs.

With the wide adoption of Li-ion batteries, Ni-rich cathode is considered as one of the most promising candidates of cathodes due to its high energy density and low cost. However, stability decreased with increasing Ni content in the Ni-rich cathode. To solve this bottleneck, many strategies, such as coating, doping, surface modification, and special morphologies, have been developed. Herein, we introduce a groundbreaking approach for enhancing Ni-rich cathode through an innovative acid etching process that promotes Mn shell self-assembly, inducing a rock-salt phase on the surface. This method not only simplifies the Ni-rich cathode modification process, but also significantly improves the structural stability and electrochemical performance of Ni-rich cathode. Our findings demonstrate that developed single-crystal Ni-rich cathode shows 3–34 % better stability compared to both commercial modified Ni-rich cathode and unmodified counterparts. The unique Mn shell effectively mitigates reversible phase shifts during cycling, contributing to a remarkable enhancement in cycling stability. This novel fabrication technique paves the way for cost-effective production of high-performance cathode materials, offering substantial benefits for lithium-ion battery technology. And this study proves the potential of this method in advancing the design and development of durable, high-capacity cathode materials for next-generation batteries.

The structure, morphology, and composition of electrode materials play a crucial role in determining the electrochemical performance of energy storage devices. Among various materials, three-dimensional (3D) porous carbon stands out for its potential to enhance electrochemical energy storage due to its cost-effectiveness, excellent ion and electron conductivity, abundant active sites, and customizable pore structure. The salt-template method offers an environmentally friendly, fast, and cost-efficient approach to synthesizing 3D porous carbon, with the added advantage of adjustable pore architecture and composition. This review provides a comprehensive overview of recent advancements in preparing 3D porous carbon and its composites using the salt-template method, emphasizing their applications in batteries and supercapacitors. It also critically examines the existing challenges and explores potential future directions for further development in this field.

The accurate estimation of battery state of charge (SOC) enables the reliable and safe operation of lithium-ion batteries. Data-driven SOC estimation is considered an emerging and effective solution. However, existing data-driven SOC estimation methods typically involve direct estimation and lack effective feedback correction. Moreover, battery degradation poses additional challenges to accurate SOC estimation. Therefore, this study proposes an adaptive combined method for battery SOC estimation based on a long short-term memory (LSTM) network and unscented Kalman filter (UKF) algorithm considering battery aging status. First, an LSTM model is constructed to characterize the battery's dynamic performance instead of traditional battery models. Then, the UKF algorithm is employed to perform SOC estimation through the feedback of terminal voltage prediction. To enhance estimation accuracy under different aging statuses, a proportional-integral-derivative controller is employed to correct the capacity fading during the SOC estimation process. Validation results indicate that the terminal voltage prediction model demonstrates exceptional robustness against interference from current and voltage noise. Compared to the traditional estimation method combining the deep learning model and Kalman filter algorithm, the proposed method demonstrates superior estimation accuracy under various complex operating conditions. Furthermore, the proposed method outperforms the traditional method in estimation performance during battery aging.

Aqueous battery systems are increasingly recognized for their potential as environmentally friendly next-generation energy storage solutions. However, their commercialization faces challenges due to the need for electrolytes that can operate stably at high voltages and in low-temperatures. Traditional approaches to address these issues often involve materials that compromise the green nature. This review highlights the importance of developing environmentally friendly materials to improve the performance of aqueous electrolytes under high voltage in different types of aqueous electrolytes such as water-in-salt, molecular crowding electrolytes, eutectic electrolytes and cosolvents. In addition, we review advances in different types of aqueous electrolytes focused on using sustainable materials to achieve stable electrolytes at low-temperature by suppressing water crystallization and lowering the freezing point. By integrating these innovations, we envision a future where aqueous batteries offer both high performance and eco-friendliness, contributing significantly to the development of sustainable energy systems.