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| 1 | Polymeric artificial solid/electrolyte interphases for Li-ion batteries显示文摘During the operation of Li-ion batteries(LIBs),solvent and electrolyte decomposition takes place at the electrode surface to form a so-called solid-electrode interphase(SEI) passivating-layer.The physical structure and chemical composition of the SEI exert profound effects on various aspects of the electrode performance of the batteries.A new concept of forming polymeric artificial SEIs(A-SEIs) based on rational design of multifunctional polymer-blend coating to achieve favorable electrode/A-SEI/electrolyte interfacial properties is described.Three examples using binary and ternary polymer blends to form mechanically robust and highly Li-ion permeable surface coatings with selected functionalities in the cases of graphite and silicon–graphite composite electrodes have demonstrated greatly enhanced capacity,rate and cycle performance.Given the rich chemistry available from polymer blends,this surface preconditioning approach holds great promise for improving the performance of various negative electrodes to meet the requirements for advanced LIBs. | Nae-Lih Wu Yu-Ting Weng Fu-Sheng Li Nai-Hsuan Yang Chin-Lung Kuo Dong-Sheng Li | 2015 | Progress in Natural Science:Materials International2015，25，6： | 1 |
| 2 | 锂离子电池硅基负极研究进展显示文摘硅由于具有超石墨10倍的高理论容量和相对适中的放电平台而备受关注,是最具潜力的下一代锂离子电池负极材料之一。然而,硅的本征电导率低,且在嵌锂的过程中有着巨大的体积变化(>300%),会导致材料粉化,电极崩塌,失去电接触。此外,在电解液中硅表面的SEI膜重复形成也导致了极化增大,库伦效率降低和电解液消耗等问题。为了解决上述问题,实现硅电极的商业化应用,改善硅基电极的途径主要有:制备新型硅基材料抑制体积效应和提高电导率,改进粘结剂来加强电极结构防止电极崩塌,改进电解液以提高SEI膜质量和库伦效率。当前,改进硅基负极材料性能的主要策略是纳米化、孔隙化和复合化。粘结剂的改性也可分为开发新型粘结剂和修饰已有粘结剂。主要从硅基材料和粘结剂两方面论述了近年来的发展状况,并展望了其未来的发展方向。 | 别依田 杨军 | 2016 | 中国材料进展2016，35，7： | 0 |
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