Efficient energy storage systems based on lithium-ion batteries represent a critical technology across many sectors including consumer electronics, electrified transportation, and a smart grid accommodating intermittent renewable energy sources. Nanostructured electrode materials present compelling opportunities for high-performance lithium-ion batteries, but inherent problems related to the high surface area to volume ratios at the nanometer-scale have impeded their adoption for commercial applications. Here, we demonstrate a materials and processing platform that realizes high-performance nanostructured lithium manganese oxide (nano-LMO) spinel cathodes with conformal graphene coatings as a conductive additive. The resulting nanostructured composite cathodes concurrently resolve multiple problems that have plagued nanoparticle-based lithium-ion battery electrodes including low packing density, high additive content, and poor cycling stability. Moreover, this strategy enhances the intrinsic advantages of nano-LMO, resulting in extraordinary rate capability and low temperature performance. With 75% capacity retention at a 20C cycling rate at room temperature and nearly full capacity retention at -20 °C, this work advances lithium-ion battery technology into unprecedented regimes of operation.
The volatile organic compounds (VOC) emitted from indoor decorating and refurbishing materials and furniture is recognized as one of the main causes of bad indoor air quality, which has resulted in serious economic losses. In European countries and the U.S., labeling systems for indoor decorating and refurbishing materials and furniture were established to address this issue with good effect. This paper is a review of these existing labeling systems. The basic principle of the labeling systems is introduced. The technical, policy and operational parts of the labeling systems are then discussed. The research concentrates on target pollutants, their threshold values and the testing methods employed. Some problems were uncovered in these labeling systems: too many VOCs were targeted; the method to determine the threshold values was not very rigorous; the testing time was too long (7-28 d). Some China's special features in developing such system are stated. Therefore, as the world's largest national producer and consumer of wood based panels and furniture, China should learn from foreign experience of establishing labeling systems as much as it can. However China should not simply copy the foreign approaches but develop its own scientific labeling system for indoor decorating and refurbishing materials and furniture.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.