Positive electrode of lithium ion secondary battery, and method of manufacturing lithium ion secondary battery

一种二次电池、锂离子的技术，应用在锂离子二次电池的正极和制造锂离子二次电池领域，能够解决锂离子二次电池循环特性不能被提高到足够的值等问题，达到减小锂离子扩散阻力、循环特性提高、提高循环特性的效果

Active Publication Date: 2016-11-02
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as a result of research, the present inventors initially found that in a lithium ion secondary battery using lithium nickel manganese oxide as a positive electrode active material, only the addition of Li 3 PO 4 or LiF lithium-ion secondary battery cycle characteristics cannot be improved to a sufficient value

Method used

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  • Positive electrode of lithium ion secondary battery, and method of manufacturing lithium ion secondary battery
  • Positive electrode of lithium ion secondary battery, and method of manufacturing lithium ion secondary battery
  • Positive electrode of lithium ion secondary battery, and method of manufacturing lithium ion secondary battery

Examples

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Effect test

example 1

[0067] A lithium ion secondary battery was prepared using the first method described above. As the positive electrode active material, LiNi is used 0.5 mn 1.5 o 4 . In addition, the cathode active material is exposed to fluorine gas in order to fluorinate the surface of the cathode active material. At this time, the fluorination conditions were adjusted so that 0.3 wt% of the LiF coating film relative to the positive electrode active material was formed. The amount of LiF formed on the surface of the cathode active material was measured using X-ray photoelectron spectroscopy (XPS). Below, LiNi on which 0.3wt% LiF is formed 0.5 mn 1.5 o 4 will be referred to as "0.3F-LiNi 0.5 mn 1.5 o 4 ".

[0068] Next, phosphoric acid compound, conductive material and binder are combined with 0.3F-LiNi 0.5 mn 1.5 o 4 mix. Li 3 PO 4 Used as a phosphoric acid compound, acetylene black (AB) as a conductive material, and polyvinylidene fluoride (PVdF) as a binder. At this time, ...

example 2

[0073] As in the case of Example 1, using LiNi 0.5 mn 1.5 o 4 as a positive electrode active material. In addition, the cathode active material is exposed to fluorine gas to fluorinate the surface of the cathode active material. In Example 2, the fluorination conditions were adjusted so that 0.1 wt% of the LiF coating film relative to the positive electrode active material was formed.

[0074] Next, phosphoric acid compound, conductive material and binder are combined with 0.1F-LiNi 0.5 mn 1.5 o 4 mixed. Li 3 PO 4 Used as a phosphoric acid compound, acetylene black (AB) as a conductive material, and polyvinylidene fluoride (PVdF) as a binder. At this time, these components are mixed with each other so that the phosphoric acid compound (Li 3 PO 4 ) is added in an amount of 1 wt%. Specifically, these components are mixed so that their weight ratio (positive electrode active material (0.1F-LiNi 0.5 mn 1.5 o 4 ): phosphoric acid compound (Li 3 PO 4 ): conductive m...

example 3

[0076] A lithium ion secondary battery was prepared using the second method described above. First, a positive electrode active material, a fluorine-containing compound, and a phosphoric acid compound are mixed, and further, a conductive material and a binder are mixed with the mixture. LiNi 0.5 mn 1.5 o 4 Used as positive electrode active material, LiF used as fluorine-containing compound, Li 3 PO 4 Used as a phosphoric acid compound, acetylene black (AB) as a conductive material, and polyvinylidene fluoride (PVdF) as a binder. At this time, these components were mixed so that the addition amount of the fluorine-containing compound (LiF) was 0.3 wt%, and the phosphoric acid compound (LiF 3 PO 4 ) is added in an amount of 1 wt%. Specifically, the ingredients are mixed so that their weight ratio (positive electrode active material (LiNi 0.5 mn 1.5 o 4 ): fluorine-containing compound (LiF): phosphoric acid compound (Li 3 PO 4 ): conductive material (AB): binder (PVdF...

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Abstract

In a method of manufacturing a lithium ion secondary battery, first, lithium nickel manganese oxide which is a positive electrode active material is exposed to fluorine-based gas to form a coating film containing amorphous lithium fluoride on a surface of the positive electrode active material. Next, a phosphate compound is added to the positive electrode active material on which the coating film containing the lithium fluoride is formed. After a lithium ion secondary battery which includes a positive electrode including the positive electrode active material is formed, the lithium ion secondary battery is charged to form a coating film containing amorphous lithium phosphate on the surface of the positive electrode active material.

Description

technical field [0001] The present invention relates to a positive electrode of a lithium ion secondary battery and a method for manufacturing the lithium ion secondary battery. Background technique [0002] A lithium ion secondary battery is chargeable or dischargeable by lithium ions in an electrolyte moving between a positive electrode and a negative electrode that store and release lithium ions. [0003] Publication Date Translation No. 2002-527873 of PCT Application (JP-A-2002-527873) discloses a technology related to lithium ion polymer batteries. In the technique disclosed in JP-A-2002-527873, in order to improve battery characteristics, an insoluble lithium compound such as Li 3 PO 4 or LiF. In addition, as the cathode material, manganese oxide (LiMn 2 o 4 , LiMnO 2 ). [0004] An important characteristic of lithium ion secondary batteries is cycle characteristics. The cycle characteristic is an index showing how much the battery capacity of the lithium ion s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/131H01M4/1391H01M4/36H01M4/505H01M4/62H01M10/04C01G53/00
CPCC01G53/54H01M4/0447H01M4/0469H01M4/131H01M4/1391H01M4/366H01M4/505H01M4/628H01M10/049H01M4/525C01P2004/80Y02P70/50Y02E60/10H01M10/058C01P2006/40H01M10/0525H01M2004/028
Inventor 岸本尚也北吉雅则
Owner TOYOTA JIDOSHA KK
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