RT Journal Article
SR Electronic
T1 An ultrastable lithium metal anode enabled by designed metal fluoride spansules
JF Science Advances
JO Sci Adv
FD American Association for the Advancement of Science
SP eaaz3112
DO 10.1126/sciadv.aaz3112
VO 6
IS 10
A1 Yuan, Huadong
A1 Nai, Jianwei
A1 Tian, He
A1 Ju, Zhijin
A1 Zhang, Wenkui
A1 Liu, Yujing
A1 Tao, Xinyong
A1 Lou, Xiong Wen (David)
YR 2020
UL http://advances.sciencemag.org/content/6/10/eaaz3112.abstract
AB The lithium metal anode (LMA) is considered as a promising star for next-generation high-energy density batteries but is still hampered by the severe growth of uncontrollable lithium dendrites. Here, we design “spansules” made of NaMg(Mn)F3@C core@shell microstructures as the matrix for the LMA, which can offer a long-lasting release of functional ions into the electrolyte. By the assistance of cryogenic transmission electron microscopy, we reveal that an in situ–formed metal layer and a unique LiF-involved bilayer structure on the Li/electrolyte interface would be beneficial for effectively suppressing the growth of lithium dendrites. As a result, the spansule-modified anode affords a high Coulombic efficiency of 98% for over 1000 cycles at a current density of 2 mA cm−2, which is the most stable LMA reported so far. When coupling this anode with the Li[Ni0.8Co0.1Mn0.1]O2 cathode, the practical full cell further exhibits highly improved capacity retention after 500 cycles.