Potassium ion capacitors (PIC) have been extensively explored as an economically favorable substitute for their well‐developed lithium ion counterparts. However, their commercialization suffers from their low energy density and relatively short cycling life. Here, a porous carbon microsheets anode is produced by morphology‐preserved thermal transformation of sheet‐like manganese‐based metal–organic frameworks. The as‐produced porous carbon microsheets anode has a disordered, interlayer‐expanded, oxygen‐doped structure, which is demonstrated to have excellent K+ storage properties in terms of specific capacity, rate capability, and cycling stability. A PIC fabricated by employing Mn‐MOF derived porous carbon (MDPC) as the anode and activated carbon as the cathode, yields an energy density of up to 120 Wh kg−1 and a maximum power density of 26 kW kg−1 as well as a long‐term cycling life over 120 000 cycles, which is close to those of most Li‐ion counterparts. These promising results demonstrate that exploring novel carbon anodes can promote the rapid development of PICs toward practical applications.

All‐solid‐state lithium batteries (ASSLBs) with desirable advantages, such as high safety and energy density, simple packaging, and wide temperature tolerance, are considered promising energy storage devices to replace traditional lithium‐ion batteries with organic liquid electrolytes. Solid‐state electrolytes (SSEs) are the critical component in ASSLBs. Argyrodites, as a typical class of sulfide‐based lithium‐ion superconductors, represent the most promising SSEs with respect to their high ionic conductivity at room temperature, low cost, good compatibility towards Li metal, and extraordinary performance reported in ASSLBs. However, lithium argyrodites are inert gas‐protective, moisture‐sensitive, interface‐unstable, and working potential window‐limited, presenting the main challenges for their commercial use. In this review, we comprehensively summarized the basic physical and chemical properties, material synthesized strategies, chemical or electrochemical stabilities, and interface engineering of lithium argyrodite SSEs. Furthermore, the recent achievements and critical challenges for lithium argyrodite from the material level to battery applications are overviewed, and the future development opportunities of integrating the lithium argyrodite SSEs into ASSLBs have been prospected.

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Lithium-ion capacitors (LICs), consisting of a battery-like negative electrode and a capacitive porous-carbon positive electrode, deliver more than twice the energy density of electric double-layer capacitors. However, their wide application suffers from low energy density and reduced cycle life at high rates. Herein, hierarchical meso-microporous carbon nanospheres with a highly disordered structure and nitrogen/phosphorous co-doped properties were synthesized through a facile template method. Such hierarchical porous structure facilitates rapid ion transport, and the highly disordered structure and high heteroatom content provide abundant active sites for Li + charge storage. Electrochemical experiments demonstrated that the carbon nanosphere anode delivers large reversible capability, greatly improves rate capability and exhibits excellent cycle stability. An LIC fabricated with the carbon nanosphere anode and an activated carbon cathode yields a high energy density of 103 W h kg −1 , an extremely high power density of 44,630 W kg −1 , and longterm cyclability of over 10,000 cycles. This work presents how structural control of carbon materials at the nano/atomic scale can significantly enhance electrochemical performance, enabling new opportunities for the design of high-performance energy-storage devices.

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