Compositions and methods for manufacturing a cathode for lithium secondary battery

Abstract

Disclosed are compositions and methods for producing a cathode for a secondary battery, where lithium manganese fluorophosphate such as Li 2 MnPO 4 F can be used as an electrode material. Li 2 MnPO 4 F is prepared by chemical intercalation of lithium, and can be used as an electrode material, and a non-lithium containing material can then be used as an anode material for manufacturing of a full cell Furthermore, it is possible to provide a carbon coating for a cathode material for a lithium battery, which has improved electrical conductivity.

1 . A cathode composition for a secondary battery, comprising a lithium manganese-based fluorophosphate compound of formula Li 2 MnPO 4 F 
     
     
         2 . The cathode composition of  claim 1 , wherein the compound of formula Li 2 MnPO 4 F has a primary particle size of about 300 nm or less. 
     
     
         3 . The cathode composition of  claim 1 , wherein the compound of formula Li 2 MnPO 4 F is coated with carbon. 
     
     
         4 . The cathode composition of  claim 3 , wherein the coated compound of formula Li 2 MnPO 4 F shows a potential plateau by discharge of about 3.7 V to about 4.0V, and a discharge capacity of about 100 mAhg −1  or more at discharge of about 2.0 V, and a discharge capacity of about 200 mAhg −1  or more at discharge of about 1.0 V. 
     
     
         5 - 16 . (canceled)