Lithium ion secondary battery

A secondary battery and lithium ion technology, applied in secondary batteries, lithium batteries, battery electrodes, etc., can solve the problems of accelerated battery heat release, low thermal stability, etc.

Active Publication Date: 2007-04-11
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the positive electrode active material with a crystalline structure having lower thermal stability causes a chain reaction involving heat release, and also causes, for example, shrinkage of the separator, thereby accelerating heat release in the battery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] (i) Preparation of positive electrode

[0084] Cobalt sulfate (CoSO 4 ) and an aqueous solution of magnesium nitrate with a concentration of 0.05mol / L are continuously added to the reactor, and sodium hydroxide is added dropwise to the reactor at the same time, so that the pH value of the water is 10 to 13, thereby synthesizing the hydroxide, namely Co 0.95 Mg 0.05 (OH) 2 , as the precursor of the active material. The precursor was placed in an oven and pre-baked at 500° C. for 12 hours in an air atmosphere to prepare a predetermined oxide.

[0085] The oxide prepared by prebaking was mixed with lithium carbonate in a molar ratio of lithium, cobalt, and magnesium of 1:0.95:0.05, and the mixture was provisionally baked at 600° C. for 10 hours, and then pulverized.

[0086] The ground baked product was then baked again at 900°C for 10 hours (final baking), and then ground and classified to obtain the formula Li(Co 0.95 Mg 0.05 )O 2 The lithium composite oxide (cath...

Embodiment 2

[0100] An aqueous solution containing cobalt sulfate at a concentration of 0.90 mol / L, magnesium nitrate at a concentration of 0.05 mol / L, and aluminum nitrate at a concentration of 0.05 mol / L was prepared. Using this aqueous solution, the hydroxide, namely Co 0.90 Mg 0.05 al 0.05 (OH) 2 , as the precursor of the active material. The precursor was placed in an oven and pre-baked at 500° C. for 12 hours in an air atmosphere to prepare a predetermined oxide.

[0101] Except that the oxide prepared by pre-baking is mixed with lithium carbonate, and the molar ratio of lithium, cobalt, magnesium and aluminum is 1:0.90:0.05:0.05, by performing the same operation as in Example 1, the following Chemical formula Li(Co 0.90 Mg 0.05 al 0.05 )O 2 The lithium composite oxide (cathode active material) shown. Then, a cylindrical battery was produced in the same manner as in Example 1 except that this positive electrode active material was used.

Embodiment 3

[0107] A cylindrical battery was produced in the same manner as in Example 1 except that a porous thin film was formed on the positive electrode material mixed layer instead of the negative electrode material mixed layer.

[0108] Evaluate

[0109] The battery capacity of the prepared battery was measured in the following manner. In addition, a nail penetration test and a 180-degree peel test were performed in the following manner. The results are shown in Table 1.

[0110] battery capacity

[0111] First, each battery is preliminarily charged / discharged in the following pattern. Then, each battery was stored at 45° C. for seven days.

[0112] 1) Constant current charging: 400mA (terminal voltage 4.0V)

[0113] 2) Constant current discharge: 400mA (terminal voltage 3.0V)

[0114] 3) Constant current charging: 400mA (terminal voltage 4.0V)

[0115] 4) Constant current discharge: 400mA (terminal voltage 3.0V)

[0116] 5) Constant current charging: 400mA (terminal voltage...

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Abstract

A lithium ion secondary battery that is furnished with a positive electrode with high thermostability and that even in a nail penetration test, markedly reduces the possibility of falling into thermal runaway. There is provided a lithium ion secondary battery comprising a positive electrode in which a composite lithium oxide is contained and a porous membrane bonded to at least one selected from among a positive electrode surface and a negative electrode surface, wherein the porous membrane comprises an inorganic oxide filler and a membrane binding agent and wherein the composite lithium oxide is represented by the formula: Lia(Co1-x-yM<1>xM<2>y)bO2 (in the formula, the element M<1> is at least one member selected from the group consisting of Mg, Sr, Y, Zr, Ca and Ti; the element M<2> is at least one member selected from the group consisting of Al, Ga, In and Tl; and 0 H01M 4 / 58 H01M 2 / 16 H01M 4 / 02 H01M 10 / 40 3 20 1 2005 / 4 / 22 1947287 2007 / 4 / 11 000000000 Matsushita Electric Ind Co., Ltd. Japan Nagasaki Akira Nishino Hajime sunjing guo donggong man 31210 Japan 2004 / 4 / 23 127853 / 2004 2006 / 10 / 20 PCT / JP2005 / 007730 2005 / 4 / 22 WO2005 / 104273 2005 / 11 / 3 Japanese

Description

technical field [0001] The present invention relates to a lithium ion secondary battery including a positive electrode having higher thermal stability and higher safety against short circuit, and particularly relates to a lithium ion secondary battery capable of being short-circuited when caused by a nail penetration test or the like Greatly reduce the possibility of battery temperature exceeding 80°C. The present invention is to solve the problem that occurs only when a positive electrode having a higher thermal stability is used. Background of the invention [0002] In recent years, large-capacity and light-weight non-aqueous secondary batteries, especially lithium ion secondary batteries, are being widely used as power sources for portable electronic devices. Lithium ion secondary batteries include a porous resin separator for insulating positive and negative electrodes and further containing a non-aqueous electrolyte. On the other hand, the resin separator uses a resi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M2/16H01M4/02H01M10/40H01M10/05H01M4/13H01M4/131H01M4/525H01M4/62H01M10/052H01M10/0566H01M10/0587
CPCY02E60/122H01M4/525H01M4/485H01M4/621H01M10/0525H01M10/0587H01M2/166H01M50/446Y02E60/10Y02P70/50
Inventor 长崎显西野肇
Owner PANASONIC CORP
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