Lithium metal anode, fabrication method thererof, and lithium secondary battery comprising same anode

Abstract

One embodiment of the present invention relates to a lithium metal anode. Wherein the lithium metal anode comprises a current collector and a lithium metal thin film layer disposed on at least one surface of the current collector and having a thickness in a range of 0.1 to 200 μm and a coating layer disposed on a surface of the lithium metal thin film layer, wherein, the coating layer comprising a Li—N—C—H—O based ionic compound.

1 . A lithium metal anode comprising:
 a current collector;   a lithium metal thin film layer disposed on at least one surface of the current collector and having a thickness in a range of 0.1 μm to 200 μm; and   a coating layer disposed on a surface of the lithium metal thin film layer,   wherein, the coating layer comprising a Li—N—C—H—O based ionic compound.   
     
     
         2 . The lithium metal anode of  claim 1 ,
 wherein the coating layer further comprises LiF.   
     
     
         3 . The lithium metal anode of  claim 1 ,
 The Li—N—C—H—O based ionic compound comprises Li—O, C—N, C—O, and C—H bonds.   
     
     
         4 . The lithium metal anode of  claim 1 ,
 The Li—N—C—H—O based ionic compound is at least one of the compounds represented by formulas (1) and (2).
   Li +− [O—R 1 —R 2  n     1   A 1   −+ Li  [Formula 1]
 
   (wherein in the formula 1, R 1  and, R 2  are each CH m F 2-m  (m is one of 0, 1, or 2),   A 1  is   
       
         
           
           
               
               
           
         
       
       and n1 is an integer of 1 to 10) 
       
         
           
           
               
               
           
         
         (wherein in the formula 2, R 3 , and R 4  are each CH m F 2-m  (m is one of 0, 1, or 2), 
         A 2  is 
       
       
         
           
           
               
               
           
         
       
       and n2 is an integer of 1 to 10.) 
     
     
         5 . The lithium metal anode of  claim 4 ,
 the compound represented by the formula (1) is at least one of the compounds represented by the following formulas (1-1) and (1-2), and   the compound represented by the formula (2) is at least one of the compounds represented by the following formulas (2-1) and (2-2).   
       
         
           
           
               
               
           
         
         (wherein in the formula 1-1, n3 is an integer of 1 to 5.) 
       
       
         
           
           
               
               
           
         
         (wherein in the formula 1-2, R 5  and R 6  are each CH m F 2-m  (m is one of 0, 1, or 2), and n4 is an integer of 1 to 5.) 
       
       
         
           
           
               
               
           
         
         (wherein in the formula 2-1, n5 is and integer of 1 to 5.) 
       
       
         
           
           
               
               
           
         
         (wherein in the formula 2-2, R 7  and R 8  are each CH m F 2-m  (m is one of 0, 1, and 2), and n6 is an integer of 1 to 5.) 
       
     
     
         6 . The lithium metal anode of  claim 1 ,
 wherein a thickness of the coating layer is in a range of 2 nm to 2 μm.   
     
     
         7 . The lithium metal anode of  claim 1 ,
 wherein a thickness of the coating layer is in a range of 10 nm to 500 nm.   
     
     
         8 . The lithium metal anode of  claim 1 ,
 the lithium metal thin film layer has a flat surface microstructure without dendrite, and   the lithium metal thin film layer comprises a columnar structure extending upward from the current collector.   
     
     
         9 . The lithium metal anode of  claim 8 ,
 wherein an average diameter of the columnar structure is in the range of 0.1 μm to 100 μm.   
     
     
         10 . The lithium metal anode of  claim 1 ,
 wherein an average pore fraction of the lithium metal thin film layer is 10% or less.   
     
     
         11 . (canceled) 
     
     
         12 . (canceled) 
     
     
         13 . (canceled) 
     
     
         14 . (canceled) 
     
     
         15 . (canceled) 
     
     
         16 . (canceled) 
     
     
         17 . (canceled) 
     
     
         18 . A lithium secondary battery comprising:
 an anode;   a cathode; and   electrolyte,   the anode is a lithium metal anode according to  claim 1 .   
     
     
         19 . A lithium metal anode comprising:
 a current collector;   a lithium metal thin film disposed on at least one surface of the current collector; and,   a protective layer disposed on the surface of the lithium metal thin film.   
     
     
         20 . The lithium metal anode of  claim 19 ,
 a thickness of the lithium metal thin film is from 5 μm to 100 μm.   
     
     
         21 . The lithium metal anode of  claim 19 ,
 a thickness of the protective layer is from 10 nm to 100 nm.   
     
     
         22 . The lithium metal anode of  claim 19 ,
 wherein the protective layer comprises at least one selected from the group consisting of F, P, C, O and S.   
     
     
         23 . (canceled) 
     
     
         24 . (canceled) 
     
     
         25 . (canceled)