Lithium ion secondary battery and a method for manufacturing the same

• US 8,383,268 B2
• Filed: 06/15/2006
• Issued: 02/26/2013
• Est. Priority Date: 11/29/2002
• Status: Expired due to Fees

• Current Assignee: Kabushiki Kaisha Ohara
• Original Assignee: Kabushiki Kaisha Ohara
• Inventors: Inda, Yasushi
• Primary Examiner(s): Ruddock, Ula C.
• Assistant Examiner(s): EGGERDING, ALIX ECHELMEYER
• Application Number:
  US11/453,377
• Publication Number:
  US 20060234130A1
• Time in Patent Office: 2,448 Days
• Field of Search: 429/188, 429/303, 429/304, 429/319, 296/233, 296/235, 204/192.1, 204/192.12, 419/40
• US Class Current: 429/223
• CPC Class Codes: H01M 10/0436 Small-sized flat cells or batteries for portable equipment
• CPC Class Codes: H01M 10/0525 Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
• CPC Class Codes: H01M 10/0562 Solid materials
• CPC Class Codes: H01M 10/058 Construction or manufacture
• CPC Class Codes: H01M 2300/0068 inorganic
• CPC Class Codes: H01M 2300/0091 in the form of mixtures
• CPC Class Codes: H01M 4/131 Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
• CPC Class Codes: H01M 4/133 Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
• CPC Class Codes: H01M 4/485 of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy H01M4/505, H01M4/525 take precedence
• CPC Class Codes: H01M 4/505 of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
• CPC Class Codes: H01M 4/525 of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product
• CPC Class Codes: Y10T 29/49115 including coating or impregnating

Abstract

A lithium ion secondary battery includes a positive electrode, a negative electrode and a thin film solid electrolyte including lithium ion conductive inorganic substance. The thin film solid electrolyte has thickness of 20 μm or below and is formed directly on an electrode material or materials for the positive electrode and/or the negative electrode. The thin film solid electrolyte has lithium ion conductivity of 10⁻⁵Scm⁻¹ or over and contains lithium ion conductive inorganic substance powder in an amount of 40 weight % or over in a polymer medium. The average particle diameter of the inorganic substance powder is 0.5 μm or below. According to a method for manufacturing the lithium ion secondary battery, the thin film solid electrolyte is formed by coating the lithium ion conductive inorganic substance directly on the electrode material or materials for the positive electrode and/or the negative electrode.

Claims

1. A method for manufacturing a lithium ion secondary battery having a thin film solid electrolyte consisting of a lithium ion conductive inorganic substance selected from the group consisting of a lithium ion conductive crystal of Li_1+x+yAl_xTi₂₋

xSi_yP<sub>3−

y</sub>O₁₂(0≦

x≦

1,0≦

y≦

1) and a lithium ion conductive glass-ceramic comprising Li_1+x+yAl_xTi<sub>2−

x</sub>Si_yP<sub>3−

y</sub>O₁₂(0≦

x≦

1,0≦

y≦

1) as a predominant crystal phase, comprising

a step of preparing a target material from glass-ceramic powder comprising Li_1+x+yAl_xTi<sub>2−

x</sub>Si_yP<sub>3−

y</sub>O₁₂(0<

x <

1,0<

y<

1) as a predominant crystal phase by using Li₃PO₄ as an inorganic binder,

a step of coating the lithium ion conductive inorganic substance directly on an electrode material or materials for a positive and/or negative electrode to form an amorphous layer of 20 μ

m or below, by using the target material and by a method selected from the group consisting of sputtering, laser abrasion and plasma coating,

and a step of forming the thin film solid electrolyte by crystallizing the amorphous layer.