Unlock instant, AI-driven research and patent intelligence for your innovation.

Non-aqueous electrolyte secondary battery negative electrode and non-aqueous electrolyte secondary battery using same

A non-aqueous electrolyte and secondary battery technology, which is applied in the field of negative electrodes for non-aqueous electrolyte secondary batteries and non-aqueous electrolyte secondary batteries, and can solve the problems of large expansion and contraction of negative electrodes and reduced cycle life of electrodes.

Pending Publication Date: 2019-11-19
NISSAN MOTOR CO LTD
View PDF18 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, a lithium-ion secondary battery using a material alloyed with Li as the negative electrode suffers from large expansion and contraction of the negative electrode during charge and discharge.
For example, in terms of volume expansion in the case where Li ions are occluded, it is about 1.2 times in graphite materials, while in Si materials, when Si and Li are alloyed, transition from amorphous to crystalline Causes a large volume change (about 4 times), so there is a problem of reducing the cycle life of the electrode
In addition, in the case of Si negative electrode active materials, capacity and cycle durability are in a trade-off relationship, and there is a problem that it is difficult to improve cycle durability while having a high capacity.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Non-aqueous electrolyte secondary battery negative electrode and non-aqueous electrolyte secondary battery using same
  • Non-aqueous electrolyte secondary battery negative electrode and non-aqueous electrolyte secondary battery using same
  • Non-aqueous electrolyte secondary battery negative electrode and non-aqueous electrolyte secondary battery using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0174] Hereinafter, the present invention will be described in more detail using examples and comparative examples. However, the technical scope of the present invention is not limited only by the following examples. It should be noted that, unless otherwise specified, "parts" means "parts by mass". In addition, the steps up to the preparation of the nonaqueous electrolyte secondary battery were all performed in a dry room.

manufacture example 1

[0177] To a personal synthesizer (manufactured by EYELA, ChemiStation) of a 100 mL test tube container equipped with a stirrer, a temperature sensor, a nitrogen line, a decompression line, and a reflux adapter, 1.0 g of methacrylic acid-modified butadiene rubber (KURARAY Co. Manufactured, L-1253, number average molecular weight 7000 (polystyrene conversion value by GPC), having a methacryloyl group at one end), 7.0 g of acrylic acid, 14 g of toluene, and 14 g of DMF were used to prepare a monomer mixed liquid. Then, while stirring the prepared monomer mixed liquid at a stirring rate of 400 rpm, nitrogen gas was blown in for 1 minute, and then a depressurization operation was performed for 1 minute. The above operation was repeated 5 times for nitrogen replacement. Thereafter, the monomer liquid mixture was heated to 65°C, and the initiator liquid mixture obtained by dissolving 0.01 g of 2,2'-azobis(2,4-dimethylvaleronitrile) in 1 g of toluene and 1 g of DMF Added and free rad...

manufacture example 2

[0185] To a personal synthesizer (manufactured by EYELA, ChemiStation) equipped with a stirrer, a temperature sensor, a nitrogen line, a decompression line, and a reflux adapter in a 100 mL test tube container, 0.1 g of methacrylic acid-modified butadiene rubber (KURARAY Co. Manufactured, L-1253, number average molecular weight 7000 (polystyrene conversion value by GPC), having a methacryloyl group at one end), 7.9 g of acrylic acid, 14 g of toluene, and 14 g of N,N-dimethylformamide (DMF) To prepare the monomer mixture. Then, while stirring the prepared monomer mixed liquid at a stirring rate of 400 rpm, nitrogen gas was blown in for 1 minute, and then a depressurization operation was performed for 1 minute. The above operation was repeated 5 times for nitrogen replacement. Thereafter, the monomer mixture was heated to 65°C, and the initiator mixture obtained by dissolving 0.01 g of 2,2'-azobis(2,4-dimethylvaleronitrile) in 1 g of toluene and 1 g of DMF was added to , to ca...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

The invention provides a non-aqueous electrolyte secondary battery negative electrode that can be produced without performing a heat treatment at 2000 DEG C or higher and that further improves discharge capacity and cycle characteristics (capacity retention). [Solution] This non-aqueous electrolyte secondary battery negative electrode comprises a negative electrode active material layer that includes a negative electrode material and a binder and is formed on the surface of a collector. The negative electrode material has core parts and shell parts. The core parts include carbonaceous negativeelectrode active material particles. The shell parts include: a polyimide; and silicon negative electrode active material particles and / or tin negative electrode active material particles. The non-aqueous electrolyte secondary battery negative electrode is characterized by containing 2-20 mass% of the silicon negative electrode active material particles and / or the tin negative electrode active material particles relative to 100 mass% of the carbonaceous negative electrode active material particles. The non-aqueous electrolyte secondary battery negative electrode is also characterized in thatthe binder is formed by bonding a hydrophilic unit and a hydrophobic unit.

Description

technical field [0001] The present invention relates to a negative electrode for a nonaqueous electrolyte secondary battery and a nonaqueous electrolyte secondary battery using the negative electrode. Background technique [0002] In recent years, in order to cope with air pollution and global warming, reduction of the amount of carbon dioxide has been strongly desired. In the automotive industry, the introduction of electric vehicles (EVs) and hybrid electric vehicles (HEVs) is expected to reduce carbon dioxide emissions, and non-aqueous electrolytes such as secondary batteries for driving motors, which are the key to their practical application, are being intensively developed Development of secondary batteries. [0003] As a secondary battery for driving a motor, it is required to have extremely high output characteristics and high energy compared with commercial lithium ion secondary batteries used in mobile phones, notebooks, and the like. Therefore, lithium-ion secon...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/133H01M4/36H01M4/38H01M4/48H01M4/587H01M4/62
CPCH01M4/133H01M4/134H01M4/1393H01M4/1395H01M4/366H01M4/386H01M4/387H01M2004/027H01M2004/021H01M4/622H01M4/625H01M10/0525Y02E60/10H01M4/587
Inventor 大泽康彦草地雄树佐藤一赤间弘崛江英明西村英起
Owner NISSAN MOTOR CO LTD