Hydrothermal Synthesis and Electrochemical Performance of Li[sub 1.59]H[sub 0.41]MnO[sub 3] as a Cathode Material for Lithium-Ion Battery

Abstract

Li 1.59 H 0.41 MnO 3 , a Li 2 MnO 3 -type cathode material, was synthesized by hydrothermally treating an amorphous MnOOH in LiOH and (NH 4 ) 2 S 2 O 8 aqueous solution. Such a rocksalt material was confirmed as proton-substituted Li 2 MnO 3 , i.e., Li 1.59 H 0.41 MnO 3 instead of a composite of Li 2 MnO 3 with other polymorphs of manganese oxides with Mn(IV) such as Li 2 Mn 4 O 9 and Li 4 Mn 5 O 12 . The Li 1.59 H 0.41 MnO 3 shows a remarkable difference in structure and electrochemical performance from those proton-substituted Li 2 MnO 3 by acid treatment in previous studies. The Li 1.59 H 0.41 MnO 3 cathode behaved similarly to that of Li 2 MnO 3 material and delivered a high discharge capacity of 256 mAh g -1 at 20 mAh g -1 (4.8-2.0 V).