Battery, positive electrode active material, positive electrode, and method for producing positive electrode active material

A positive active material and battery technology, which is applied in the field of power systems, can solve the problems of battery safety reduction and abnormality, and achieve the effect of suppressing heat generation and suppressing the reduction of battery characteristics

Inactive Publication Date: 2016-09-14
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] These lithium ion secondary batteries have disadvantages such as gas generation due to internal short circuit during charging, heat generation due to heating from the outside of the battery, and heat generation in the charged state due to heat generation of the battery. Oxygen release due to thermal decomposition reaction on the surface of the positive electrode
The reaction of oxygen generated by the positive electrode with the electrolyte near the positive electrode causes a combustion reaction inside the battery to proceed and generate heat, resulting in a decrease in the safety of the battery
Furthermore, in the case of using silicon (Si), a metal such as tin (Sn), or a metal alloy as the anode active material, oxygen released from the cathode directly reacts with the anode active material in a chain reaction, which causes abnormal situations, such as battery ignition

Method used

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  • Battery, positive electrode active material, positive electrode, and method for producing positive electrode active material
  • Battery, positive electrode active material, positive electrode, and method for producing positive electrode active material
  • Battery, positive electrode active material, positive electrode, and method for producing positive electrode active material

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no. 1 approach

[0041] The first embodiment will show a cathode active material, a method of manufacturing the cathode active material, and a cathode using the cathode active material each according to an embodiment of the present disclosure.

[0042] (1-1) Structure of positive electrode active material

[0043] The positive electrode active material according to an embodiment of the present disclosure is a deoxidized lithium transition metal composite oxide obtained by mixing a reducing agent with a lithium transition metal composite oxide capable of intercalating and deintercalating lithium, and deoxidizing the lithium transition metal from the lithium transition metal by baking. Oxygen is extracted from the composite oxide. This treatment is hereinafter referred to as deoxidation treatment as appropriate. The deoxidized lithium transition metal composite oxide is obtained by reduction.

[0044] [Lithium transition metal composite oxide]

[0045] Examples of the lithium transition metal...

no. 2 approach

[0111] The second embodiment will show a cylindrical battery using a positive electrode including a positive electrode active material subjected to deoxidation treatment according to the first embodiment.

[0112] (2-1) Structure of cylindrical battery

[0113] [Structure of cylindrical battery]

[0114] figure 1 is a sectional view showing an example of the structure of the cylindrical battery 10 according to the second embodiment. The cylindrical battery 10 is, for example, a lithium ion secondary battery capable of charging and discharging. This cylindrical battery 10 includes, inside a substantially hollow cylindrical battery case 11 , an unillustrated liquid electrolyte (hereinafter appropriately referred to as electrolyte solution) and a wound electrode body 20 interposed therebetween by winding The strip-shaped positive electrode 21 and negative electrode 22 of the separator 23 according to the present embodiment of the present disclosure are formed.

[0115] The ba...

no. 3 approach

[0168] The third embodiment shows a thin battery including a positive electrode of the positive electrode active material subjected to the deoxidation treatment according to the first embodiment.

[0169] (3-1) Structure of thin battery

[0170] image 3 The structure of the thin battery 42 according to the third embodiment is shown. This thin battery 42 is a so-called laminated film type in which the wound electrode body 30 to which the positive electrode lead 31 and the negative electrode lead 32 are attached is accommodated inside a film-like packaging member 40 formed of a laminated film or the like.

[0171] For example, the cathode lead 31 and the anode lead 32 are each drawn out from the inside of the airtight packaging member 40 toward the outside in the same direction. The cathode lead 31 and the anode lead 32 are each formed in a thin plate state or a network state using, for example, a metal material such as aluminum (Al), copper (Cu), nickel (Ni), or stainless st...

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Abstract

The invention relates to a battery, a positive electrode active material, a positive electrode and a method for manufacturing the positive electrode active material. The battery includes a positive electrode, a negative electrode and an electrolyte. The positive electrode includes a positive electrode active material layer including a binder and a positive electrode active material of a deoxidized lithium transition metal composite oxide on at least one surface of a positive electrode collector. When the positive electrode active material layer is heated at a state of charge higher than or equal to 4.2V and lower than or equal to 4.5V at the lithium counter-electrode potential, the positive electrode active material layer shows that the positive electrode active material layer is composed of A first peak and a second peak of an oxygen amount generated by a positive electrode active material, the second peak appearing in a temperature region higher than that of the first peak. At least the second peak appears in a temperature region higher than 220°C.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of Japanese Priority Patent Application JP2012-232655 filed on October 22, 2012, the entire contents of which are hereby incorporated by reference. technical field [0003] The present disclosure relates to a battery, a positive active material, a positive electrode, and a method of manufacturing the positive active material. The present disclosure also relates to a battery pack, an electronic device, an electric vehicle, an electric storage device, and an electric power system each using the battery. Background technique [0004] In recent years, mobile information electronic devices such as mobile phones, video cameras, and laptop personal computers have become common, and these devices have higher functions and have become smaller and lighter. The power source for these devices is a non-reusable primary battery or a reusable secondary battery. Among them, non-aqueous electrolyte...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/485H01M4/131H01M10/0525
CPCH01M4/131H01M4/485H01M4/505H01M4/525H01M10/0525B60L2200/26B60L50/64H01M4/0471H01M4/1391H01M4/13915H01M4/628H01M10/0468H01M10/052H01M10/4235H01M10/52H01M2004/021H01M2220/10H01M2220/20Y02E60/10Y02T10/70C01D15/02Y02P70/50
Inventor岩间正之安部薰镜庆一高田智雄川濑贤一
OwnerMURATA MFG CO LTD