Nonaqueous electrolyte secondary battery

Abstract

A nonaqueous electrolyte secondary battery disclosed in the present application includes: a positive electrode capable of absorbing and releasing lithium, containing a positive electrode active material composed of a lithium-containing transition metal oxide having a layered crystalline structure; and a negative electrode capable of absorbing and releasing lithium, containing a negative electrode active material composed of a lithium-containing transition metal oxide obtained by substituting some of Ti element of a lithium-containing titanium oxide having a spinel crystalline structure with one or more element different from Ti, wherein a retention of the negative electrode is set to be greater than a retention of the positive electrode, and an irreversible capacity rate of the negative electrode is set to be greater than an irreversible capacity rate of the positive electrode, whereby a discharge ends by negative electrode limitation.

1 - 13 . (canceled) 
     
     
         14 . A nonaqueous electrolyte secondary battery comprising:
 a positive electrode capable of absorbing and releasing lithium, containing a positive electrode active material composed of a lithium-containing transition metal oxide having a layered crystalline structure; and   a negative electrode capable of absorbing and releasing lithium, containing a negative electrode active material composed of a lithium-containing transition metal oxide obtained by substituting some of Ti element of a lithium-containing titanium oxide having a spinel crystalline structure with one or more element different from Ti, the one or more element different from Ti including at least one element selected from the group consisting of Fe, V and B,   wherein a discharge ends by negative electrode limitation.   
     
     
         15 . The nonaqueous electrolyte secondary battery according to  claim 14 , wherein the negative electrode active material has an irreversible capacity rate greater than the positive electrode active material. 
     
     
         16 . The nonaqueous electrolyte secondary battery according to  claim 14 , wherein the lithium-containing titanium oxide is Li 4 Ti 5 O 12 . 
     
     
         17 . The nonaqueous electrolyte secondary battery according to  claim 14 , wherein the lithium-containing transition metal oxide obtained by substituting some of Ti element of a lithium-containing titanium oxide having a spinel crystalline structure with one or more element different from Ti includes a compound represented as Li 4 Ti 5-x Fe x O 12  (0<x≦0.3). 
     
     
         18 . The nonaqueous electrolyte secondary battery according to  claim 14 , wherein the lithium-containing transition metal oxide obtained by substituting some of Ti element of a lithium-containing titanium oxide having a spinel crystalline structure with one or more element different from Ti includes a compound represented as Li 4 Ti 5-y V y O 12  (0<y≦0.05). 
     
     
         19 . The nonaqueous electrolyte secondary battery according to  claim 14 , wherein the lithium-containing transition metal oxide obtained by substituting some of Ti element of a lithium-containing titanium oxide having a spinel crystalline structure with one or more element different from Ti includes a compound represented as Li 4 Ti 5-z B z O 12  (0<z≦0.3). 
     
     
         20 . The nonaqueous electrolyte secondary battery according to  claim 14 , wherein the lithium-containing transition metal oxide obtained by substituting some of Ti element of a lithium-containing titanium oxide having a spinel crystalline structure with one or more element different from Ti includes a compound represented as Li 4 Ti 5-w-y Mn w V y O 12  (0<w≦0.3, 0<y≦0.05). 
     
     
         21 . The nonaqueous electrolyte secondary battery according to  claim 14 , wherein the lithium-containing transition metal oxide obtained by substituting some of Ti element of a lithium-containing titanium oxide having a spinel crystalline structure with one or more element different from Ti includes a compound represented as Li 4 Ti 5-w-z Mn w B z O 12  (0<w≦0.3, 0<z≦0.3). 
     
     
         22 . The nonaqueous electrolyte secondary battery according to  claim 14 , wherein the lithium-containing transition metal oxide obtained by substituting some of Ti element of a lithium-containing titanium oxide having a spinel crystalline structure with one or more element different from Ti includes a compound represented as Li 4 Ti 5-x-y Fe x V y O 12  (0<x≦0.3, 0<y≦0.05). 
     
     
         23 . The nonaqueous electrolyte secondary battery according to  claim 14 , wherein the lithium-containing transition metal oxide obtained by substituting some of Ti element of a lithium-containing titanium oxide having a spinel crystalline structure with one or more element different from Ti includes a compound represented as Li 4 Ti 5-x-z Fe x B z O 12  (0<x≦0.3, 0<z≦0.3). 
     
     
         24 . The nonaqueous electrolyte secondary battery according to  claim 14 , wherein the positive electrode active material includes at least one compound represented as Li a Ni 1-b-c Co b M c O 2  (0.95≦a≦1.12, 0≦b≦1, 0≦c≦0.50, 0≦b+c≦1, M is at least one element selected from the group consisting of Al, Mn, Ti, Mg, Mo, Y, Zr and Ca). 
     
     
         25 . The nonaqueous electrolyte secondary battery according to  claim 14 , wherein the positive electrode active material includes at least one selected from the group consisting of:
 a compound represented as LiCoO 2 ;   a compound represented as LiNi 1/3 Mn 1/3 Co 1/3 O 2 ; and   a compound represented as LiNi 0.81 Co 0.15 Al 0.04 O 2 .