US2020006768A1PendingUtilityA1

Lithium-manganese composite oxide and method for producing same, and positive electrode material, positive electrode and lithium ion secondary battery using same

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Assignee: NEC CORPPriority: Jan 31, 2017Filed: Jan 31, 2018Published: Jan 2, 2020
Est. expiryJan 31, 2037(~10.5 yrs left)· nominal 20-yr term from priority
Inventors:Ryota YugeMitsuharu TabuchiKyousuke DoumaeHideka Shibuya
C01P 2002/22C01P 2002/32H01M 10/0525H01M 2004/028H01M 4/505H01M 4/525C01G 53/006C01G 53/82C01G 53/50Y02E60/10
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Claims

Abstract

A lithium-manganese composite oxide containing a lithium-iron-manganese composite oxide represented by the composition formula: Li1+x−w(FeyNizMn1−y−z)1−xO2−δ, where 0<x<⅓, 0≤w<0.8, 0<y<1, 0<z<0.5, y+z<1, and 0≤δ<0.5, in which at least in a state of charge of a lithium ion battery using the lithium-manganese composite oxide as a positive-electrode active material, at least some of iron atoms are pentavalent.

Claims

exact text as granted — not AI-modified
1 . A lithium-manganese composite oxide comprising a lithium-iron-manganese composite oxide represented by the composition formula: Li 1+x−w (Fe y Ni z Mn 1−y−z ) 1−x O 2−δ  wherein 0<x<⅓, 0≤w<0.8, 0<y<1, 0<z<0.5, y+z<1, and 0≤δ<0.5,
 wherein at least in a state of charge of a lithium ion battery using the lithium-manganese composite oxide as a positive-electrode active material, at least some of iron atoms are pentavalent. 
 
     
     
         2 . A lithium-manganese composite oxide comprising a lithium-iron-manganese composite oxide represented by the composition formula described in  claim 1 , wherein at least some of iron atoms are pentavalent. 
     
     
         3 . The lithium-manganese composite oxide according to  claim 1 , wherein the lithium-iron-manganese composite oxide represented by the composition formula satisfies 0<w<0.8. 
     
     
         4 . The lithium-manganese composite oxide according to  claim 1 , wherein, in the lithium-iron-manganese composite oxide represented by the composition formula, nickel is trivalent or lower-valent and manganese is tetravalent or lower-valent. 
     
     
         5 . A positive electrode material using the lithium-manganese composite oxide according to  claim 1 . 
     
     
         6 . The positive electrode material according to  claim 5 , comprising another lithium complex oxide and/or a lithium iron phosphate mixed therein. 
     
     
         7 . The positive electrode material according to  claim 5 , comprising a conductive material mixed therein. 
     
     
         8 . A positive electrode for a lithium ion secondary battery, comprising the lithium-manganese composite oxide according to  claim 1  as a positive-electrode active material. 
     
     
         9 . A lithium ion secondary battery using the positive electrode for a lithium ion secondary battery according to  claim 8 . 
     
     
         10 . A method for producing the lithium-manganese composite oxide according to  claim 1  by a wet chemical process using a coprecipitation-baking method, comprising
 coprecipitating and bubbling using a divalent Mn salt in combination with a trivalent or higher-valent Mn salt as a Mn source; mixing a lithium salt; drying and grinding; and baking and water-washing. 
 
     
     
         11 . The method for producing the lithium-manganese composite oxide according to  claim 10 , comprising detaching Li with an oxidant. 
     
     
         12 . The lithium-manganese composite oxide according to  claim 2 , wherein the lithium-iron-manganese composite oxide represented by the composition formula satisfies 0<w<0.8. 
     
     
         13 . The lithium-manganese composite oxide according to  claim 2 , wherein, in the lithium-iron-manganese composite oxide represented by the composition formula, nickel is trivalent or lower-valent and manganese is tetravalent or lower-valent. 
     
     
         14 . A positive electrode material using the lithium-manganese composite oxide according to  claim 2 . 
     
     
         15 . A positive electrode for a lithium ion secondary battery, comprising the lithium-manganese composite oxide according to  claim 2  as a positive-electrode active material. 
     
     
         16 . A lithium ion secondary battery using the positive electrode for a lithium ion secondary battery according to  claim 15 . 
     
     
         17 . A method for producing the lithium-manganese composite oxide according to  claim 2  by a wet chemical process using a coprecipitation-baking method, comprising
 a coprecipitating and bubbling using a divalent Mn salt in combination with a trivalent or higher-valent Mn salt as a Mn source; mixing a lithium salt; drying and grinding; and baking and water-washing.

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