Shuang Xia, Zhifeng Lin, Bohao Peng, Xuelong Yuan, Jingzhen Du, Xinhai Yuan, Lili Liu, Lijun Fu, Rudolf Holze and Yuping Wu
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MN can be sustainably released from the modified separator into the electrolyte and can dissociate into Mg<small><sup>2+</sup></small> and NO<small><sub>3</sub></small><small><sup>−</sup></small>, which standardizes the deposition of Li<small><sup>+</sup></small> cations and forms an ionic-conductive protective layer on the LMA, respectively. SP@MND shows an outstanding performance in both ether-based and ester-based electrolytes, and LMAs can exhibit a long cycling life of over 4800 h at 0.5 mA cm<small><sup>−2</sup></small> and 0.5 mA h cm<small><sup>−2</sup></small> and a high current density of up to 50 mA cm<small><sup>−2</sup></small>. The assembled LMBs exhibit a low capacity decay rate of 0.059% after 1000 cycles at 3C for a Li//S battery and a high average coulombic efficiency of 99.2% at 10C for the Li//LiFePO<small><sub>4</sub></small> one after 1000 cycles. 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引用次数: 0
摘要
锂金属电池(LMB)可以缓解 "续航焦虑",并因其高能量密度而具有广阔的前景。然而,由于锂金属阳极(LMA)不受约束,锂金属电池的安全性和循环性能较差,限制了其进一步应用。为了解决锂电池中存在的问题,人们尝试了许多解决方案,但很少有研究关注廉价的分离器。在此,我们为锂金属阳极制备了一种由导电性超级 P 和 Mg(NO3)2 (MN) 改性的分离器(SP@MND)。超级 P 可以促进阴极的反应动力学。MN 可持续地从改性分离器中释放到电解液中,并解离成 Mg2+ 和 NO3-,从而规范了 Li+ 阳离子的沉积,并分别在 LMA 上形成了离子导电保护层。SP@MND 在醚基和酯基电解质中都具有出色的性能,在 0.5 mA cm-2 的条件下,LMA 可维持超过 4800 小时的长循环寿命,电流密度高达 50 mA cm-2。组装后的 LMB 在 3 C 条件下循环 1000 次后,锂//S 电池的容量衰减率低至 0.059%;在 10 C 条件下循环 1000 次后,锂//LiFePO4 电池的平均库仑效率高达 99.2%。这项工作为生产性能/成本比高的 LMB 提供了坚实的基础。
Sustainable release of Mg(NO3)2 from a separator boosts the electrochemical performance of lithium metal as an anode for secondary batteries†
Lithium metal batteries (LMBs) can alleviate ‘range anxiety’ and have broad prospects due to their high energy densities. However, poor safety and cycling performances of the LMBs due to the unconstrained lithium metal anodes (LMAs) limit their further application. Many solutions have been proposed to address the problems of LMBs, but few studies have focused on cheap separators. Here, a separator modified with conductive Super P and Mg(NO3)2 (MN) (SP@MND) is prepared for LMBs. Super P can promote the reaction kinetics of cathodes. MN can be sustainably released from the modified separator into the electrolyte and can dissociate into Mg2+ and NO3−, which standardizes the deposition of Li+ cations and forms an ionic-conductive protective layer on the LMA, respectively. SP@MND shows an outstanding performance in both ether-based and ester-based electrolytes, and LMAs can exhibit a long cycling life of over 4800 h at 0.5 mA cm−2 and 0.5 mA h cm−2 and a high current density of up to 50 mA cm−2. The assembled LMBs exhibit a low capacity decay rate of 0.059% after 1000 cycles at 3C for a Li//S battery and a high average coulombic efficiency of 99.2% at 10C for the Li//LiFePO4 one after 1000 cycles. This work provides a solid basis for the production of LMBs with a high ratio of performance to cost.
期刊介绍:
Energy & Environmental Science, a peer-reviewed scientific journal, publishes original research and review articles covering interdisciplinary topics in the (bio)chemical and (bio)physical sciences, as well as chemical engineering disciplines. Published monthly by the Royal Society of Chemistry (RSC), a not-for-profit publisher, Energy & Environmental Science is recognized as a leading journal. It boasts an impressive impact factor of 8.500 as of 2009, ranking 8th among 140 journals in the category "Chemistry, Multidisciplinary," second among 71 journals in "Energy & Fuels," second among 128 journals in "Engineering, Chemical," and first among 181 scientific journals in "Environmental Sciences."
Energy & Environmental Science publishes various types of articles, including Research Papers (original scientific work), Review Articles, Perspectives, and Minireviews (feature review-type articles of broad interest), Communications (original scientific work of an urgent nature), Opinions (personal, often speculative viewpoints or hypotheses on current topics), and Analysis Articles (in-depth examination of energy-related issues).