Method for producing positive electrode for lithium ion battery, positive electrode for lithium ion battery, and lithium ion battery using the positive electrode

A lithium-ion battery and a manufacturing method technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as insufficient removal, and achieve the effect of excellent storage characteristics and reliability

Inactive Publication Date: 2011-05-04
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, water washing of lithium transition metal oxides is insufficient as a method for removing lithium hydroxide and lithium carbonate from lithium transition metal oxides.

Method used

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  • Method for producing positive electrode for lithium ion battery, positive electrode for lithium ion battery, and lithium ion battery using the positive electrode
  • Method for producing positive electrode for lithium ion battery, positive electrode for lithium ion battery, and lithium ion battery using the positive electrode
  • Method for producing positive electrode for lithium ion battery, positive electrode for lithium ion battery, and lithium ion battery using the positive electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] (1) Preparation and cleaning of the positive electrode

[0083] 1kg of LiNi 0.80 co 0.15 al 0.05 o 2 powder, 0.5kg of NMP solution of polyvinylidene fluoride (#1320 produced by Kureha Chemical Co., Ltd., solid content concentration of 12% by mass), 40g of acetylene black, and an appropriate amount of NMP are thrown into a double-arm mixer together, and mixed at 30 The mixture was stirred for 30 minutes at °C to prepare a paste for forming a positive electrode active material layer. The obtained paste was applied to both surfaces of a 20 μm thick aluminum foil serving as a positive electrode current collector, and dried at 120° C. for 15 minutes to form a positive electrode active material layer. Then, the total thickness of the positive electrode current collector and the positive electrode active material layer was adjusted to 160 μm by pressing with a roll press, thereby obtaining a positive electrode. The obtained positive electrode was cut into a size that can ...

Embodiment 2～8

[0102] Lithium ion batteries were produced in the same manner as in Example 1 except that the temperature during the cleaning treatment of the positive electrode was set to the value shown in Table 1 below, and their physical properties were evaluated.

Embodiment 9～16

[0106] Dissolve 15.2g LiPF relative to 100mL of PC 6 , and then add hydrogen fluoride (HF) to prepare a positive electrode cleaning solution. The resulting cleaning solution (LiPF 6 +LiPF in HF / PC) 6 The concentration of HF is 1.0mol / L, and the concentration of HF is 400ppm. In addition to replacing LiPF 6 / PC and the above-mentioned positive electrode cleaning solution (LiPF 6 +HF / PC), lithium ion batteries were produced in the same manner as in Examples 1 to 8. In addition, the physical properties of the obtained lithium ion battery were evaluated in the same manner as in Example 1. The above results are shown in Table 2 below.

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Abstract

A positive electrode for a lithium ion battery, which comprises a positive electrode active material layer containing a lithium transition metal oxide such as lithium nickel oxide, is cleaned with a cleaning liquid that contains an aprotic solvent containing propylene carbonate or the like, and at least one hydrogen halide such as hydrogen fluoride or a fluorine-containing lithium salt such as LiPF6. By cleaning the positive electrode with the cleaning liquid, 300-4000 [mu]g of lithium halide is adhered to the surface of the positive electrode active material, per 1g of the positive electrode active material.

Description

technical field [0001] The present invention relates to a lithium ion battery, and in particular relates to an improvement of a method for removing impurities in a positive electrode active material for a lithium ion battery. Background technique [0002] The positive electrode of the lithium ion battery contains a lithium transition metal oxide as a positive electrode active material and the like. Lithium transition metal oxides are generally LiCoO 2 , but in recent years, LiNiO has also been proposed 2 and other lithium nickel oxides. Patent Document 1 discloses the use of Li a m b Ni c co d o 2 Lithium nickel oxide represented by (M is at least one metal selected from Al, Mn, Cu, Fe, etc., b+c+d=1). [0003] Generally, a lithium transition metal oxide is synthesized by firing a transition metal-containing compound and a lithium compound. During the synthesis of lithium transition metal oxides, lithium hydroxide and lithium carbonate are produced as by-products. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/1391H01M4/36H01M4/505H01M4/525
CPCH01M4/131H01M4/1391H01M4/366H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 出口正树
Owner PANASONIC CORP
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