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SnO2 is known as a promising anode candidate for lithium‐ion batteries (LIBs), but suffers from the low electrical conductivity and severe volume variation during cycling, which restraint its practical applications. To solve these issues, we successfully fabricated the three‐dimensional structure of carbon obtained from corn stalks and SnO2 composites. The materials exhibit excellent electrochemical performance. After 100 cycles, it shows a reversible capacity of 691 mA h g−1 at a current density of 0.2 C. Excellent cycle performance is due to the unique structure, which has a strong internal chemical bond between the SnO2 nanoparticles (SnO2 NPs) and the carbon skeleton, preventing SnO2 NPs from falling off the 3D network during the cycle. This work may provide a broader vision into synthesising C‐SnO2 composites for high‐performance anode materials of LIBs. In this paper, we successfully fabricated the three‐dimensional structure of carbon obtained from corn stalks and SnO2 composites by a simple one‐step hydrothermal method. The materials exhibit excellent electrochemical performance. After 100 cycles, it shows a reversible capacity of 691 mA h g−1 at a current density of 0.2 C. Its electrochemical performance is much higher than the SnO2 used in the market. [ABSTRACT FROM AUTHOR]

Rapid progresses concerning wearable electronics call for stretchable batteries. Owing to the merits of high energy density and wide operating voltage range, organic electrolyte‐based lithium‐ion batteries (LIBs) take a large proportion in the powering markets. Due to the high sensitivity to moisture and oxygen, it is difficult to obtain long‐term reliable stretchable organic electrolyte‐based LIBs when they are directly exposed to the air. Benefiting from the outstanding gas impermeability of liquid metal (LM) and relatively good barrier properties for reactive acid gas molecules by polyisobutylene (PIB), an LM‐PIB seal is demonstrated for organic electrolyte‐based LIBs. In the seal, LM can prevent the inward permeation of oxygen and water vapor, and PIB can block the outward permeation of hydrolysis acid generated from the side reactions during the operation of the organic electrolyte‐based LIBs, which helps prevent the detrimental interaction between the hydrolysis acid and LM. A specific capacity of over 120 mAh g−1 is achieved and the battery shows consistent electrochemical performances under multiple deformations. This study offers a different design approach for long‐term operation of stretchable organic electrolyte‐based LIBs. [ABSTRACT FROM AUTHOR]