Non-aqueous electrolyte secondary cell and method for manufacturing same

A non-aqueous electrolyte and secondary battery technology, applied in the direction of non-aqueous electrolyte storage battery, electrolyte storage battery manufacturing, secondary battery, etc., can solve the large batch difference, secondary battery performance cycle life (insufficient capacity maintenance rate, battery Resolves problems such as low reproducibility of characteristics and achieves excellent cycle durability

Inactive Publication Date: 2014-12-24
NISSAN MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Insufficient performance (charge and discharge capacity, rate characteristics), cycle life (capacity retention rate) and battery characteristics of a non-aqueous organic electrolyte secondary battery in which the layered lithium-containing transition metal oxide is used as a positive electrode active material low reproducibility and large batch-to-batch variability

Method used

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  • Non-aqueous electrolyte secondary cell and method for manufacturing same
  • Non-aqueous electrolyte secondary cell and method for manufacturing same
  • Non-aqueous electrolyte secondary cell and method for manufacturing same

Examples

Experimental program
Comparison scheme
Effect test

manufacture example 1

[0124] This example and the following positive electrode production examples 2 to 4 show examples of positive electrode production.

[0125] [Positive electrode active material]

[0126] As the positive electrode active material, use the composition formula Li 1.5 [Ni 0.2 co 0.2 mn 0.8 [Li] 0.3 ]O 3 , a+b+c+d=1.5, d=0.3, a+b+c=1.2 layered transition metal oxide containing lithium.

[0127] [Composition of positive electrode slurry]

[0128] The composition of the positive electrode slurry was as follows.

[0129]

[0130] [Manufacture of positive electrode slurry]

[0131] The positive electrode slurry having the above composition was prepared as follows.

[0132] First, 3.0 parts by weight of a binder was dissolved in 30 parts by weight of NMP to prepare a binder solution. Then, add 33.0 parts by weight of the above-mentioned binder solution in the mixed powder of 4.0 parts by weight of conductive agent and 100 parts by weight of positive electrode active materia...

manufacture example 2

[0143] [Positive electrode active material]

[0144] As the positive electrode active material, use the composition formula Li 1.5 [Ni 0.25 co 0.25 mn 0.75 [Li] 0.25 ]O 3 , a+b+c+d=1.5, d=0.25, a+b+c=1.25 layered transition metal oxide containing lithium. Except for this, the same operations as in positive electrode production example 1 were repeated to obtain positive electrode C12 of this example. Table 1 shows the specifications and the like of the positive electrode active material of this example.

manufacture example 3

[0146] [Positive electrode active material]

[0147] As the positive electrode active material, use the composition formula Li 1.5 [Ni 0.45 mn 0.85 [Li] 0.20 ]O 3 , a+b+c+d=1.5, d=0.20, a+b+c=1.3 layered transition metal oxide containing lithium. Except for this, the same operations as in positive electrode production example 1 were repeated to obtain positive electrode C13 of this example. Table 1 shows the specifications and the like of the positive electrode active material of this example.

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Abstract

The present invention provides a non-aqueous electrolyte secondary cell in which degradation of the electrolytic solution or the negative electrode active material is minimized and excellent cycle durability achieved, and a method for manufacturing the same. This non-aqueous electrolyte secondary cell is provided with: a positive electrode capable of doping and de-doping lithium ions; a negative electrode capable of occluding and releasing lithium ions, lithium, or a lithium alloy; and an electrolytic solution containing an organic solvent, a lithium salt electrolyte, and an additive. The positive electrode active material of the positive electrode contains a layered lithium-containing transition metal oxide represented by formula (1) Li1.5[NiaCobMnc[Li]d]O3 (where a, b, c, and d satisfy 0 < a < 1.4, 0 <=b< 1.4, 0< c< 1.4, 0< d<= 0.5, a + b + c + d = 1.5, and 1.0<= a + b + c< 1.5), and a spinel phase present in a part thereof. The negative electrode active material of the negative electrode contains a carbon-based material in which all or part of the surface thereof is covered with a coating derived from an additive.

Description

technical field [0001] The present invention relates to a nonaqueous electrolyte secondary battery and a method for manufacturing the same, and more specifically, to a nonaqueous electrolyte secondary battery excellent in cycle durability and a method for manufacturing the same. Background technique [0002] In recent years, in response to air pollution and global warming, reductions in carbon dioxide emissions have been urgently desired. In the automotive industry, the reduction of carbon dioxide emissions through the introduction of electric vehicles (EVs) and hybrid electric vehicles (HEVs) is expected to be concentrated, and electric devices such as secondary batteries for driving motors, which are the key to their practical use, are being actively developed . [0003] Lithium-ion secondary batteries having high theoretical energy have attracted attention as secondary batteries for driving electric motors, and are currently being rapidly developed. Lithium-ion secondar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M4/36H01M4/505H01M4/525H01M4/587H01M10/0567H01M10/0568H01M10/0569H01M10/058
CPCH01M4/0445H01M4/133H01M4/366H01M4/505H01M4/525H01M4/587H01M10/0525H01M10/0567H01M10/058H01M4/0447Y02E60/10Y10T29/49108Y02P70/50H01M4/131H01M2004/028Y02T10/70
Inventor 山本伸司田中秀明荻原航
Owner NISSAN MOTOR CO LTD
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