Positive electrode for lithium ion battery, method for producing same, and lithium ion battery using the positive electrode

A technology for a lithium ion battery and a manufacturing method, applied in the field of lithium ion batteries, can solve the problems of low reactivity and reduced internal resistance of the lithium ion battery, and achieve the effects of excellent durability and reliability

Active Publication Date: 2012-05-09
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to Patent Document 1, such a lithium-containing nickel oxide has low reactivity with a non-aqueous electrolyte, and can reduce the internal resistance of a lithium-ion battery by using it as a positive electrode active material.

Method used

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  • Positive electrode for lithium ion battery, method for producing same, and lithium ion battery using the positive electrode
  • Positive electrode for lithium ion battery, method for producing same, and lithium ion battery using the positive electrode
  • Positive electrode for lithium ion battery, method for producing same, and lithium ion battery using the positive electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] (1) Preparation of positive electrode active material

[0082] Lithium carbonate (Li 2 CO 3 ), by Ni 0.75 co 0.2 al 0.05 (OH) 2 The represented co-precipitation hydroxide makes the ratio of the moles of Li in lithium carbonate to the total moles of Ni, Co and Al (Ni+Co+Al) in the above-mentioned co-precipitation hydroxide reach a ratio of 1:1 mixed in a manner, and the resulting mixture was calcined at 700° C. for 20 hours under an oxygen atmosphere. After calcination, the calcined product was pulverized and classified to obtain a lithium-containing nickel oxide having an average particle diameter of 10 μm. The composition of the obtained lithium-containing nickel oxide (positive electrode active material A) is LiNi 0.75 co 0.2 al 0.05 o 2 , and the content ratio x of Li was 1.00.

[0083] On the other hand, Li 2 CO 3 and Ni 0.75 co 0.2 al 0.05 (OH) 2 The mixture was mixed so that the ratio of the number of moles of Li to the total number of moles of Ni...

Embodiment 2

[0100] Except for Li 2 CO 3 and Ni 0.75 co 0.2 al 0.05 (OH) 2 A lithium-containing nickel oxide having an average particle diameter of 10 μm was obtained in the same manner as in Example 1 except that the molar ratio of Li to the sum of Ni, Co, and Al was mixed so as to be 1.030:1. The resulting lithium-containing nickel oxide has a composition of Li 1.030 Ni 0.75 co 0.2 al 0.05 o 2 , the content ratio x of Li was 1.030. A battery was produced in the same manner as in Example 1 except that the outer layer of the positive electrode was formed by using this lithium-containing nickel oxide instead of the positive electrode active material B.

Embodiment 3

[0102] Except for Li 2 CO 3 and Ni 0.75 co 0.2 al 0.05 (OH) 2 A lithium-containing nickel oxide having an average particle diameter of 10 μm was obtained in the same manner as in Example 1, except that the ratio of the moles of Li to the sum of the moles of Ni, Co, and Al was 1.031:1. The resulting lithium-containing nickel oxide has a composition of Li 1.031 Ni 0.75 co 0.2 al 0.05 o 2 , the content ratio x of Li was 1.031. A battery was fabricated in the same manner as in Example 1 except that the outer layer of the positive electrode was formed by using the lithium-containing nickel oxide instead of the positive electrode active material B.

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Abstract

Disclosed are: a positive electrode which contains lithium-containing nickel oxide as a positive electrode active material and has excellent input / output characteristics, excellent durability and excellent reliability; and a lithium ion battery which uses the positive electrode. The positive electrode comprises a positive electrode collector and a positive electrode active material layer that is formed on the surface of the positive electrode collector. The positive electrode active material layer contains a lithium-containing nickel oxide represented by general formula (1): LixNi1-(p+q+r)CopAlqMrO2+y (wherein M represents a transition element (excluding Ni and Co) or the like; and 0.8 = x = 1.4 and 0 < (p + q + r) = 0.7) and lithium carbonate, and has a high lithium carbonate concentration region and a low lithium carbonate concentration region. The high concentration region occupies 2-80% of the total thickness of the positive electrode active material layer from the surface thereof, while the low concentration region occupies the rest on the positive electrode collector side.

Description

technical field [0001] The present invention relates to lithium ion batteries, and specifically relates to improvement of positive electrodes in lithium ion batteries. Background technique [0002] A lithium ion battery includes a positive electrode, a negative electrode, a separator arranged between the positive electrode and the negative electrode, and a nonaqueous electrolyte. As the positive electrode active material contained in the positive electrode, it is widely known that Li w CoO 2 Lithium-containing cobalt oxides such as (w is a value that varies depending on charge and discharge of the battery, the same applies hereinafter). Lithium-containing cobalt oxide has a high potential with respect to lithium, is excellent in reliability, and is relatively easy to synthesize. [0003] On the other hand, in recent years, from the viewpoint of further increasing the capacity of lithium-ion batteries, Li w CoO 2 Lithium-containing nickel oxides are used as positive elec...

Claims

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Application Information

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IPC IPC(8): H01M4/131H01M4/1391H01M4/525H01M4/62
CPCY02E60/12H01M4/5825Y02E60/122H01M4/525H01M2004/028Y02T10/7011H01M10/052H01M4/366H01M10/0587H01M4/364H01M4/0404Y10T29/49115Y02E60/10H01M10/0525H01M4/1391
Inventor 厚朴谦一名仓健祐
Owner PANASONIC CORP
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