@article{Zheng_Guo_Kang_Fan_Gu_Mao_Liu_Huang_Li_Shen_Lu_Chen_2021, title={Stable Lithium-Carbon Composite Enabled by Dual-Salt Additives}, volume={13}, url={https://www.nmlett.org/index.php/nml/article/view/877}, DOI={10.1007/s40820-021-00633-3}, abstractNote={<p>Lithium metal is regarded as the ultimate negative electrode material for secondary batteries due to its high energy density. However, it suffers from poor cycling stability because of its high reactivity with liquid electrolytes. Therefore, continuous efforts have been put into improving the cycling Coulombic efficiency (CE) to extend the lifespan of the lithium metal negative electrode. Herein, we report that using dual-salt additives of LiPF<sub>6</sub> and LiNO<sub>3</sub> in an ether solvent-based electrolyte can significantly improve the cycling stability and rate capability of a Li-carbon (Li-CNT) composite. As a result, an average cycling CE as high as 99.30% was obtained for the Li-CNT at a current density of 2.5&nbsp;mA&nbsp;cm<sup>–2</sup> and an negative electrode to positive electrode capacity (N/P) ratio of 2. The cycling stability and rate capability enhancement of the Li-CNT negative electrode could be attributed to the formation of a better solid electrolyte interphase layer that contains both inorganic components and organic polyether. The former component mainly originates from the decomposition of the LiNO<sub>3</sub> additive, while the latter comes from the LiPF<sub>6</sub>-induced ring-opening polymerization of the ether solvent. This novel surface chemistry significantly improves the CE of Li negative electrode, revealing its importance for the practical application of lithium metal batteries.</p> <p>Highlights:</p> <p>1 It is the first report that using dual-salt additives of LiPF<sub>6</sub> and LiNO<sub>3</sub> to significantly improve the cycling performance of the Li-CNT negative electrode.<br>2 The mechanism why the combined use of LiPF<sub>6</sub> and LiNO<sub>3</sub> additive can improve the cycling performance and rate capability of the Li-CNT negative electrode was investigated.<br>3 An average cycling Coulombic efficiency as high as 99.30% was obtained for the Li-CNT negative electrode at a current density of 2.5 mA cm<sup>−2</sup> and an negative electrode to positive electrode capacity (N/P) ratio of 2.</p>}, journal={Nano-Micro Letters}, author={Zheng, Lei and Guo, Feng and Kang, Tuo and Fan, Yingzhu and Gu, Wei and Mao, Yayun and Liu, Ya and Huang, Rong and Li, Zhiyun and Shen, Yanbin and Lu, Wei and Chen, Liwei}, year={2021}, month={Apr.}, pages={111} }