Lithium ion secondary battery

Patent metadata

Field	Value
Publication number	US-2016294001-A1
Application number	US-201615083539-A
Country	US
Kind code	A1
Filing date	Mar 29, 2016
Priority date	Mar 31, 2015
Publication date	Oct 6, 2016
Grant date	—

Abstract

Provided is a lithium ion secondary battery including a power generation element, the power generation element including a positive electrode, a negative electrode, a separator, and an electrolyte solution, the positive electrode including a positive electrode current collector, and a positive electrode active material layer provided for the positive electrode current collector, the positive electrode active material layer including a positive electrode active material and binder, the negative electrode including a negative electrode current collector and a negative electrode active material layer provided for the negative electrode current collector, the negative electrode active material layer including a negative electrode active material and binder. The positive electrode has a volume resistivity in a range of 100 Ωcm or more and 700 Ωcm or less after at least one charging and discharging cycle.

First claim

What is claimed is:

1 . A lithium ion secondary battery comprising a power generation element,
the power generation element including a positive electrode, a negative electrode, a separator, and an electrolyte solution, the positive electrode including a positive electrode current collector, and a positive electrode active material layer provided for the positive electrode current collector, the positive electrode active material layer including a positive electrode active material and binder, the negative electrode including a negative electrode current collector and a negative electrode active material layer provided for the negative electrode current collector, the negative electrode active material layer including a negative electrode active material and binder, wherein the positive electrode has a volume resistivity in a range of 100 Ωcm or more and 700 Ωcm or less after at least one charging and discharging cycle.

2 . The lithium ion secondary battery according to claim 1 , wherein the positive electrode active material is a lithium nickel manganese cobalt composite oxide represented by a general formula Li x Ni y Mn z Co (1-y-z) O 2 , the oxide being with a layer crystal structure.

3 . The lithium ion secondary battery according to claim 1 , wherein the positive electrode has a volume resistivity in a range of 100 Ωcm or more and 300 Ωcm or less after at least one charging and discharging cycle.

4 . The lithium ion secondary battery according to claim 2 , wherein the positive electrode has a volume resistivity in a range of 100 Ωcm or more and 300 Ωcm or less after at least one charging and discharging cycle.

5 . The lithium ion secondary battery according to claim 2 , wherein the positive electrode active material includes a lithium nickel manganese cobalt composite oxide represented by the following general formula:
Li x Ni y Mn z Co (1-y-z) O 2
(where x is a numeral of 1 or more and 1.2 or less, y and z are positive numerals satisfying y+z<1, and y is a numeral of 0.5 or less).

6 . The lithium ion secondary battery according to claim 1 , wherein the negative electrode active material includes graphite particles and amorphous carbon particles.

7 . The lithium ion secondary battery according to claim 2 , wherein the negative electrode active material includes graphite particles and amorphous carbon particles.

8 . The lithium ion secondary battery according to claim 3 , wherein the negative electrode active material includes graphite particles and amorphous carbon particles.

9 . The lithium ion secondary battery according to claim 4 , wherein the negative electrode active material includes graphite particles and amorphous carbon particles.

10 . The lithium ion secondary battery according to claim 5 , wherein the negative electrode active material includes graphite particles and amorphous carbon particles.

Assignees

• Automotive Energy Supply Corp

Inventors

• Suga Sohei
• Shinohara Koichi
• Ohara Kenji
• Horiuchi Toshihiro
• Aoyagi Masanori
• Nishiyama Junko

Classifications

• H01M4/625

  Carbon or graphite · CPC title

• H01M4/587

  for inserting or intercalating light metals · 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

• H01M4/623

  fluorinated polymers · CPC title

• H01M4/505

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