Electrical device

Patent metadata

Field	Value
Publication number	US-2017005362-A1
Application number	US-201415113096-A
Country	US
Kind code	A1
Filing date	Jan 24, 2014
Priority date	Jan 24, 2014
Publication date	Jan 5, 2017
Grant date	—

Abstract

To provide a means for sufficiently utilizing a high capacity characteristic of a solid solution positive electrode active material and capable of achieving satisfactory performance of a rate characteristic in an electrical device such as a lithium ion secondary battery containing a positive electrode using the solid solution positive electrode active material.
An electrical device has a power generating element containing a positive electrode in which a positive electrode active material layer containing a positive electrode active material is formed on a surface of a positive electrode current collector, a negative electrode in which a negative electrode active material layer containing a negative electrode active material is formed on a surface of a negative electrode current collector, and a separator. The coating amount of the negative electrode active material layer is from 3 to 11 mg/cm 2 , and the negative electrode active material layer contains a negative electrode active material represented by formula (1). The positive electrode active material layer contains a positive electrode active material (solid solution positive electrode active material) represented by formula (2), and a material represented by formula (3) and having a predetermined amount of a predetermined element M on particle surfaces is used as the solid solution positive electrode active material contained in the positive electrode active material layer.

First claim

1 . An electric device comprising a power generating element containing:
a positive electrode in which a positive electrode active material layer containing a positive electrode active material is formed on the surface of a positive electrode current collector; a negative electrode in which a negative electrode active material layer containing a negative electrode active material is formed on the surface of a negative electrode current collector; and a separator, wherein the coating amount of the negative electrode active material layer is from 3 to 11 mg/cm 2 , the negative electrode active material layer contains a negative electrode active material represented by the following formula (1):
[Numerical formula 1]
α (Si-containing alloy)+β(carbon material)   (1)

in the formula, α and β represent % by weight of each component in the negative electrode active material layer, 80≦α+β≦98, 3≦α≦40, and 40≦α≦95, the positive electrode active material layer contains a positive electrode active material represented by the following formula (2):
[Numerical formula 2]
e (solid solution positive electrode active material)   (2)

in the formula, e represents % by weight of each component in the positive electrode active material layer, and 80≦e≦98, the solid solution positive electrode active material is represented by the following formula (3):
[Numerical formula 3]
Li 1.5 [Ni a Mn b Co c [Li] d ]O z   (3)

in the formula, z represents the number of oxygen for satisfying the atomic valence, a+b+c+d=1.5, 0.1≦d≦0.4, and 1.1≦[a+b+c]≦1.4, and one or more kinds of elements M selected from the group consisting of Al, Zr, Ti, Nb, B, S, Sn, W, Mo, and V are present on particle surfaces of the solid solution positive electrode active material in an amount satisfying 0.002≦[M]/[a+b+c]≦0.05 when the amount of presence of the element M is represented by [M].

2 . The electric device according to claim 1 , wherein the Si-containing alloy is formed of one or more kinds selected from the group consisting of Si x Ti y Ge z A a , Si x Ti y Zn z A a , Si x Ti y Sn z A a , Si x Sn y Al z A a , Si x Sn y V z A a , Si x Sn y C z A a , Si x Zn y V z A a , Si x Zn y Sn z A a , Si x Zn y Al z A a , Si x Zn y C z A a , Si x Al y C z A a , and Si x Al y Nb z A a (in the formula, A represents an inevitable impurity, x, y, z, and a represent % by weight, 0<x<100, 0<y<100, 0<z<100, 0<a<0.5, and x+y+z+a=100.

3 . The electric device according to claim 1 , wherein the electric device is a lithium ion secondary battery.

Assignees

• Nissan Motor
• Nissan Motor

Inventors

• Nakagawa Takamasa
• Yamamoto Shinji

Classifications

• H01M4/505

  of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy · CPC title

• H01M4/525

  of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title

• H01M10/0525 Primary

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M4/131

  Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title

• H01M10/446

  Initial charging measures · CPC title