Lithium-ion batteries power everything from electric vehicles and portable electronics to grid-scale energy storage, thanks to their high energy density, lack of memory effect, and adaptability across temperature ranges. However, repeated charge-discharge cycles cause gradual capacity fade, eventually rendering the battery unusable when it drops below a critical threshold. Accurate prediction of remaining useful life (RUL)—the number of cycles left before this failure point—is essential for proactive battery management, preventing unexpected failures, optimizing replacement schedules, and reducing costs and safety risks in real-world applications.

Lithium-ion capacitors (LICs) bridge the performance gap between traditional lithium-ion batteries and supercapacitors, delivering superior power density, extended cycle life, and significantly higher energy density than conventional double-layer capacitors. These attributes position LICs as a compelling solution for demanding applications such as electric vehicle acceleration, regenerative braking in urban rail systems, wind power smoothing, smart grid stabilization, and uninterruptible power supplies. Their ability to charge in seconds makes them particularly attractive for high-power scenarios, yet rapid charging introduces a serious risk: lithium plating on the anode. This unwanted deposition of metallic lithium can lead to reduced efficiency, capacity fade, increased internal resistance, and in severe cases, dendrite formation that risks short circuits and thermal runaway. Until recently, no direct or precise method existed to monitor lithium plating specifically in LICs during high-rate charging, limiting the safe exploitation of their full potential.

As cities worldwide accelerate toward electrification and decarbonization, the convergence of distributed energy resources and electric mobility is reshaping the architecture of modern power systems. Distributed Generation (DG), encompassing technologies such as solar photovoltaics, wind turbines, and fuel cells, has emerged as a critical enabler for reducing transmission losses and enhancing energy resilience. At the same time, the rapid adoption of electric vehicles (EVs) is introducing unprecedented demand patterns, placing new stress on existing distribution networks. The challenge lies not merely in deploying these technologies, but in orchestrating their integration in a way that ensures grid stability, efficiency, and sustainability.

Porous piezoelectric ceramics exhibit strong potential for sensing weak mechanical stimuli. However, the intrinsic coupling between the piezoelectric charge coefficient (d₃₃) and dielectric constant (εᵣ) limits energy conversion efficiency. Here, a fully open, three-dimensionally interconnected PZT-based porous ceramic (3D-PPC) is developed to overcome this constraint. Despite an ultrahigh porosity of 92%, the material retains a high d₃₃ (~470 pC/N), while εᵣ is significantly reduced (~140), leading to a ~14-fold enhancement in g₃₃ (~380 × 10^-3 V·m/N). This performance arises from synergistic effects of heterogeneous stress/electric fields, multiscale domain structures, and defect engineering, demonstrating that 3D interconnected porosity actively modulates local polarization behavior.

Tsinghua University Press is pleased to announce the launch of Carbonsphere, a new open-access, peer-reviewed journal dedicated to carbon science, technology, and policy. Sponsored by Qinghai University and Tsinghua University and published by Tsinghua University Press, the journal creates a new interdisciplinary platform for research spanning natural systems, engineered systems, and human systems.

Tsinghua University Press has launched Health Engineering, a new international open-access journal designed to unite engineering, biotechnology, and medical science in addressing some of the most pressing global health challenges. The journal aims to accelerate research that applies engineering principles to improve health outcomes, enable earlier disease intervention, and support the transition from treatment-focused medicine toward proactive health management.