Nonaqueous electrolyte secondary battery and method for manufacturing the same

Patent metadata

Field	Value
Publication number	US-2016380303-A1
Application number	US-201615189495-A
Country	US
Kind code	A1
Filing date	Jun 22, 2016
Priority date	Jun 24, 2015
Publication date	Dec 29, 2016
Grant date	—

Abstract

A nonaqueous electrolyte secondary battery includes a prismatic housing having an opening and a sealing member sealing the opening. The prismatic housing contains a flat-wound electrode assembly and a nonaqueous electrolyte. The flat-wound electrode assembly includes a positive electrode and a negative electrode. The positive electrode includes a positive electrode substrate and a positive electrode active material mixture layer formed on the positive electrode substrate. The positive electrode active material mixture layer contains lithium carbonate and lithium phosphate. The nonaqueous electrolyte contains lithium fluorosulfonate.

First claim

What is claimed is:

1 . A nonaqueous electrolyte secondary battery comprising:
an electrode assembly comprising a positive electrode and a negative electrode, the positive electrode comprising a positive electrode active material, lithium carbonate, and lithium phosphate, the negative electrode comprising a negative electrode active material; and a nonaqueous electrolyte containing lithium fluorosulfonate.

2 . The nonaqueous electrolyte secondary battery according to claim 1 , further comprising:
a housing having an opening and containing the electrode assembly and the nonaqueous electrolyte; a sealing member sealing the opening; a terminal attached to the sealing member and electrically connected to the positive electrode or the negative electrode; and a current-interrupting mechanism disposed on a conduction path between the positive electrode or the negative electrode and the terminal, the current-interrupting mechanism being activated to break the conduction path and thereby interrupt a current therethrough when the internal pressure of the battery reaches a predetermined level or higher.

3 . The nonaqueous electrolyte secondary battery according to claim 1 , further comprising:
a housing having an opening and containing the electrode assembly and the nonaqueous electrolyte; a sealing member sealing the opening; a terminal attached to the sealing member and electrically connected to the positive electrode or the negative electrode; and a short-circuiting mechanism that is activated to forcedly short-circuit the positive electrode and the negative electrode when the internal pressure of the battery reaches a predetermined level or higher.

4 . The nonaqueous electrolyte secondary battery according to claim 3 , further comprising:
a fusible portion disposed on a conduction path between the positive electrode or the negative electrode and the terminal, the fusible portion being blown by a short-circuit current upon activation of the short-circuiting mechanism.

5 . The nonaqueous electrolyte secondary battery according to claim 1 , wherein
the positive electrode active material is a lithium transition metal oxide, and the negative electrode active material is a carbonaceous material.

6 . A method for manufacturing a nonaqueous electrolyte secondary battery comprising an electrode assembly, a nonaqueous electrolyte, a housing having an opening and containing the electrode assembly and the nonaqueous electrolyte, and a sealing member sealing the opening, the electrode assembly comprising a positive electrode and a negative electrode, the positive electrode comprising a positive electrode active material, lithium carbonate, and lithium phosphate, the negative electrode comprising a negative electrode active material, the nonaqueous electrolyte containing lithium fluorosulfonate, the method comprising:
placing the nonaqueous electrolyte in the housing.

Assignees

• Sanyo Electric Co

Inventors

• Minami Keisuke
• Kuratomi Yukari
• Inoue Masao
• Fujihara Toyoki
• Nakanishi Naoya

Classifications

• H01M10/0525 Primary

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

• H01M2004/028

  Positive electrodes · CPC title

• H01M4/5825

  Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines · CPC title

• H01M4/485

  of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy (H01M4/505, H01M4/525 take precedence) · CPC title

• H01M10/058

  Construction or manufacture · CPC title