电解质
相间
化学工程
溶解
材料科学
电化学
动力学
无定形固体
阴极
电极
锂(药物)
化学
有机化学
物理化学
遗传学
物理
量子力学
工程类
生物
医学
内分泌学
作者
Yi‐Hu Feng,Mengting Liu,Junxiu Wu,Yang Liu,Qiang Liu,Yongwei Tang,Xu Zhu,Guojun Wei,Haojie Dong,Xiulin Fan,Si-Fan Chen,Wenyu Hao,Lianzheng Yu,Xiao Ji,Ya You,Peng Fei Wang,Jun Lü
标识
DOI:10.1002/anie.202403585
摘要
In spite of the competitive performance at room temperature, the development of sodium-ion batteries (SIBs) is still hindered by sluggish electrochemical reaction kinetics and unstable electrode/electrolyte interphase under subzero environments. Herein, a low-concentration electrolyte, consisting of 0.5 M NaPF6 dissolving in diethylene glycol dimethyl ether solvent, is proposed for SIBs working at low temperature. Such an electrolyte generates a thin, amorphous, and homogeneous cathode/electrolyte interphase at low temperature. The interphase is monolithic and rich in organic components, reducing the limitation of Na+ migration through inorganic crystals, thereby facilitating the interfacial Na+ dynamics at low temperature. Furthermore, it effectively blocks the unfavorable side reactions between active materials and electrolytes, improving the structural stability. Consequently, Na0.7Li0.03Mg0.03Ni0.27Mn0.6Ti0.07O2//Na and hard carbon//Na cells deliver a high capacity retention of 90.8% after 900 cycles at 1 C, a capacity over 310 mA h·g-1 under -30 ºC, respectively, showing long-term cycling stability and great rate capability at low temperature.
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