Hongjun Yue

Preparation and Properties of Manganese Oxide/Carbon Composites by Reduction of Potassium Permanganate with Acetylene Black

left in the mother liquor. All the composites were characterized by scanning electron micrograph, X-raydiffraction, and thermogravimetric/diffenential thermal analysis techniques. The electrochemical performances of the compositeswere also investigated and one composition delivered a discharge capacity as high as 231 mAh g

Hydrothermal Synthesis of Nanosized LiMnO2-Li2MnO3 Compounds and Their Electrochemical Performances

National Basic Research Program of China [2007CB209702]; National Natural Science Foundation of China [90606015, 20473060, 29925310, 20021002]

Hydrothermal Synthesis and Electrochemical Performance of Li1.59H0.41MnO3 as a Cathode Material for Lithium-Ion Battery

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).

Sodium-Ion-Assisted Hydrothermal Synthesis of γ-MnO2 and Its Electrochemical Performance

National Natural Science Foundation of China [20433060, 20473068, 29925310]; National Basic Research Program (973 Program)