Process for preparation of spinel-type lithium manganate

Abstract

The process for preparing spinel-type lithium manganate according to the present invention is constituted by a process to admix the electrolyzed manganese dioxide, which is obtained by neutralizing manganese dioxide precipitated by means of electrolysis with any of potassium hydroxide, potassium carbonate and lithium hydroxide, and a lithium material and a process to subject the resulting mixture to a sintering process.

What is claimed is:  
     
         1 . A process for preparing spinel-type lithium manganate characterized in that the spinel-type lithium manganate is prepared by admixing electrolyzed manganese dioxide, which is obtained by neutralizing manganese dioxide precipitated by means of electrolysis with any of potassium hydroxide, potassium carbonate and lithium hydroxide, and a lithium material and consequently by subjecting the mixture to a sintering process.  
     
     
         2 . The process for preparing spinel-type lithium manganate according to  claim 1 , wherein pH of the electrolyzed manganese dioxide being neutralized with either potassium hydroxide or potassium carbonate is 2 or more.  
     
     
         3 . The process for preparing spinel-type lithium manganate according to  claim 1 , wherein the electrolyzed manganese dioxide being neutralized with lithium hydroxide contains lithium in an amount of 0.02-0.5% by weight.  
     
     
         4 . The process for preparing spinel-type lithium manganate according to any of  claims 1  to  3 , wherein the manganese dioxide is pulverized either before or after the neutralization with any of potassium hydroxide, potassium carbonate and lithium hydroxide.  
     
     
         5 . The process for preparing spinel-type lithium manganate according to  claim 4 , wherein the average particle size of the pulverized manganese dioxide is in a range of from 5 to 30 m.  
     
     
         6 . The process for preparing spinel-type lithium manganate according to any of claims  1  through  5 , wherein the sintering process is operated at a temperature higher than 750° C.  
     
     
         7 . An anode material for non-aqueous electrolyte containing secondary battery characterized by being composed of the spinel-type lithium manganate obtained according to the process described in any of claims  1  through  6 .  
     
     
         8 . A non-aqueous electrolyte containing secondary battery characterized by being constituted with an anode using the anode material for non-aqueous electrolyte containing secondary battery according to  claim 7 , a cathode capable of occluding or de-occluding lithium alloy or lithium and non-aqueous electrolyte.