Positive electrode for non-aqueous electrolyte secondary battery, and non-aqueous electrolyte secondary battery, battery module and battery system using the same

Abstract

A positive electrode (1) for non-aqueous electrolyte secondary batteries, including a collector (11) and an active material layer (12), wherein a spreading resistance distribution of the layer (12) shows a profile with a sum of frequencies of resistance values 4.0 to 6.0 (logΩ) accounting for 0.0 to 5.0% relative to a total, 100%, of frequencies of resistance values 4.0 to 12.5 (logΩ). A positive electrode (1) for non-aqueous electrolyte secondary batteries, including a collector (11) and an active material layer (12), wherein the layer (12) includes an active material and a conductive carbon material, and an amount of a low-resistance conductive carbon material having a resistivity of 0.10 Ω·cm or less is 0.5% by mass or less, based on a total mass of the layer (12). A positive electrode (1) for non-aqueous electrolyte secondary batteries, including a collector (11) and an active material layer (12), wherein the active material has a coated section including a conductive material, and the layer (12) has a powder resistivity of 10 to 1,000 Ω·cm.

1 - 10 . (canceled) 
     
     
         11 . A positive electrode for a non-aqueous electrolyte secondary battery, comprising a current collector and a positive electrode active material layer provided on the current collector, wherein:
 the positive electrode current collector has, on at least a part of its surface facing the positive electrode active material layer, a current collector coating layer;   the positive electrode active material layer comprises a positive electrode active material and a conductive carbon material;   the positive electrode active material layer comprises particle main bodies consisting of the positive electrode active material, and a coating section present on at least a part of surface of each of the particle main bodies, wherein at least a part of the conductive carbon material forms the coating section, and a resistivity of the coating section is 0.15 to 1.0 Ω·cm;   an amount of the conductive carbon is 0.9 to 4.0% by mass, based on a total mass of the positive electrode active material layer;   an amount of a low-resistance conductive carbon material having a resistivity of 0.10 Ω·cm or less is 0.5% by mass or less, based on a total mass of the positive electrode active material layer.   
     
     
         12 . The positive electrode according to  claim 11 , wherein an amount of a low-resistance conductive carbon material having a resistivity of 0.02 Ω·cm or less is 0.5% by mass or less, based on a total mass of the positive electrode active material layer. 
     
     
         13 - 14 . (canceled) 
     
     
         15 . The positive electrode according to  claim 11 , wherein the positive electrode active material layer contains a conducting agent, and at least a part of the conductive carbon material is the conducting agent. 
     
     
         16 . The positive electrode active material according to  claim 11 , wherein the positive electrode active material comprises a compound represented by a formula LiFe x M (1−x) PO 4 , wherein 0≤x≤1, M is Co, Ni, Mn, Al, Ti or Zr. 
     
     
         17 . A non-aqueous electrolyte secondary battery, comprising the positive electrode of  claim 11 , a negative electrode, and a non-aqueous electrolyte disposed between the positive electrode and the negative electrode. 
     
     
         18 . A battery module or battery system comprising a plurality of the non-aqueous electrolyte secondary batteries of  claim 17 . 
     
     
         19 - 34 . (canceled)