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Non-aqueous electrolyte secondary battery and manufacturing method thereof

一种非水电解质、二次电池的技术，应用在非水电解质蓄电池、电解质蓄电池制造、二次电池等方向，能够解决正极电位变化大、正极单极循环劣化速度变高等问题，达到循环特性提高、抑制循环劣化、循环特性优异的效果

Active Publication Date: 2016-03-09
PANASONIC INTPROP MANAGEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As described above, the conventional battery proposed in Patent Document 1 is positive electrode limited
Therefore, in this conventional battery, the potential change of the positive electrode is large at the end of discharge, and the rate of cycle deterioration of the positive electrode becomes high, so the cycle deterioration of the battery becomes remarkable.

Method used

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  • Non-aqueous electrolyte secondary battery and manufacturing method thereof
  • Non-aqueous electrolyte secondary battery and manufacturing method thereof
  • Non-aqueous electrolyte secondary battery and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1）

[0085]

[0086] First, as the positive electrode active material, LiNi 0.80 co 0.15 Al 0.05 o 2 . LiNi 0.80 co 0.15 Al 0.05 o 2 The modulation method is as follows.

[0087] A predetermined ratio of cobalt sulfate was added to an aqueous nickel sulfate solution having a concentration of 1 mol / liter to prepare an aqueous metal salt solution. While stirring the aqueous metal salt solution at a low speed while maintaining the temperature at 50° C., an alkali solution containing 30% by weight of sodium hydroxide was added dropwise to adjust the pH to 12 to obtain hydroxide precipitates. After filtering and washing this precipitate with water, it dried by heating at 80 degreeC in air.

[0088] Next, the obtained hydroxide was stirred in water in a reaction tank at 30°C, and a predetermined amount of NaAlO was added to the reaction tank. 2And stir well. Thereafter, the solution in the reaction tank was neutralized to pH 9 using sulfuric acid. As a result, aluminum hydr...

Embodiment 2）

[0108] A battery was produced in the same manner as in Example 1 except that the content of graphite fluoride in the negative electrode mixture was different. The negative electrode mixture is based on the weight ratio of Li 4 Ti 5 o 12 :VGCF:PVdF:(CF) n =100:5:4:0.82, add an appropriate amount of N-methyl-2-pyrrolidone (NMP) to stir and mix to form a slurry-like negative electrode mixture.

Embodiment 3）

[0112] A battery was produced in the same manner as in Example 1 except that the negative electrode mixture was different. With the Li that the method identical with embodiment 1 is made 4 Ti 5 o 12 , Acetylene black (AB) as a conductive agent, polyvinylidene fluoride (PVdF) as a binder, and graphite fluoride (manufactured by Daikin Industries, (CF) n ) to Li by weight ratio 4 Ti 5 o 12 :AB:PVdF:(CF) n =100:5:4:2.9, add an appropriate amount of N-methyl-2-pyrrolidone (NMP) to stir and mix to form a slurry-like negative electrode mixture.

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Abstract

The nonaqueous electrolyte secondary battery of the present invention includes a positive electrode (1), a negative electrode (2), a separator (3) disposed between the positive electrode (1) and the negative electrode (2), and a nonaqueous electrolyte (15). The positive electrode (1) contains a positive electrode active material containing a lithium-containing transition metal oxide having a layered crystal structure. The negative electrode (2) contains a negative electrode active material containing a Ti-based oxide, and an additive containing carbon fluoride that reacts with lithium at a higher potential than the negative electrode active material. In the non-aqueous electrolyte secondary battery of the present invention, the battery voltage reaches the end-of-discharge voltage due to the potential change of the negative electrode (2).

Description

technical field [0001] The present invention relates to a non-aqueous electrolyte secondary battery and a manufacturing method thereof. Background technique [0002] In recent years, various nonaqueous electrolyte secondary batteries are being developed. As a representative battery of the nonaqueous electrolyte secondary battery, there is a lithium ion secondary battery. Conventionally, carbon materials have been mainly used as negative electrode active materials for lithium ion secondary batteries, and they have been put into practical use. Lithium-ion secondary batteries using carbon materials as the negative electrode active material have the advantages of high electromotive force and high energy density, and are used as main power sources for mobile communication devices and portable electronic devices. In addition, the newly developed lithium-titanium composite oxide material that can be used as a negative electrode active material has attracted attention. For exampl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0525H01M4/36H01M4/48H01M4/583H01M10/058
CPCH01M4/364H01M4/485H01M4/5835H01M10/0525H01M10/058Y02E60/10Y02P70/50Y02T10/70
Inventor 辻智辉白根隆行美浓辰治
Owner PANASONIC INTPROP MANAGEMENT CO LTD
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