Effect of halogen-nitrate heterogeneous additives in carbonate-ether mixed electrolytes on inhibiting the growth of Li dendrites
Effect of halogen-nitrate heterogeneous additives in carbonate-ether mixed electrolytes on inhibiting the growth of Li dendrites
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DOI：
10.1016/j.jallcom.2022.166434
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发表时间：
2022-07
影响因子：
6.2
通讯作者：
X. Xin;Chunyu Cui;Kaiyuan Shi;Xuting Yuan;Xing Li
中科院分区：
文献类型：
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作者：
X. Xin;Chunyu Cui;Kaiyuan Shi;Xuting Yuan;Xing Li
锂金属由于其高能量密度而被认为是锂金属电池最有前途的阳极。然而，Li枝晶生长是关键障碍之一，因为这种形成的存在可能导致短路，这将导致致命的安全隐患，如火灾和爆炸。开发稳定Li/电解质界面上的固体电解质界面（SEI）膜以抑制Li枝晶形成的电解质仍然具有挑战性。在不同的电解质中，基于LiNO 3碳酸盐电解质的报道很少，因为LiNO 3在碳酸盐溶液中的低溶解度。本文系统地研究了以碳酸乙烯酯、碳酸二甲酯和二甲醚（EC：DMC：DME）为溶剂的卤离子（X双键C1-，Br-，I-）对锂枝晶的抑制作用。采用LiBr-LiNO 3电解液可以获得高度光滑的金属锂表面。所形成的稳定且均匀的SEI膜从根本上减少了树枝状Li的成核位置，并为均匀的Li沉积建立了理想的基体。因此，Li金属在LiBr-LiNO 3混合电解质中显示出改善的循环，这可能是本质上抑制枝晶生长的关键。
Li metal is recognized as the most promising anode for Li metal batteries due to its high energy density. However, Li dendritic growth is one of the critical obstacles as the presence of this formation may lead to short circuits which will result in the fatal safety hazards like fire and explosion. Developing electrolytes which stabilize the solid electrolyte interface (SEI) film on Li/electrolyte interface to inhibit the Li dendritic formation is still challenging. Among the different electrolytes, few are reported based on LiNO3-carbonated electrolyte because of the low solubility of LiNO3in carbonated solution. Here, the new advanced electrolyte based on halogen ions (Xdouble bondC1—, Br—, I—) dissolved in a mixture of vinyl carbonate, dimethyl carbonate and dimethyl ether (EC:DMC:DME) on inhibiting Li dendrites was investigated systematically. The highly smooth surface of Li metal could be obtained by adopting the LiBr-LiNO3electrolytes. The formed stable and homogeneous SEI film fundamentally decreases the nucleation sites for dendritic Li and establishes ideal matrix for the even Li deposition. The Li metal thus shows improved cycling in LiBr-LiNO3mixed electrolyte which may be the crucial for inhibit dendrite growth intrinsically.