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Solvent for coating positive electrode material of secondary battery, positive electrode material slurry comprising the same, and secondary battery prepared therewith

A positive active material, secondary battery technology, applied in secondary batteries, battery electrodes, final product manufacturing, etc., can solve the problems of increased drying speed and other process speeds, inability to achieve high-content loading, and reduced dispersion stability. Achieve the effect of improving capacity characteristics and life characteristics, improving capacity retention rate, and high initial discharge capacity

Active Publication Date: 2018-09-14
ENF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when a large amount of organic solvent is used, even after drying, undried parts will occur, and high-loading cannot be realized, and the drying speed and other process speeds will increase, causing a problem that the productivity will drop.
In addition, for the positive electrode active material slurry with a low solid content concentration, due to the reduced dispersion stability, when forming the positive electrode active material layer, there are problems that may cause deviations in layer thickness and load.
Especially due to the harmfulness of the above-mentioned organic solvents, there is a problem of not being environmentally friendly enough

Method used

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  • Solvent for coating positive electrode material of secondary battery, positive electrode material slurry comprising the same, and secondary battery prepared therewith

Examples

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Embodiment 1

[0117] The surface-coated LiCoO 2 The positive electrode active material, conductive material (carbon black) and binder (polyvinylidene fluoride, PVdF) were mixed at a weight ratio of 95:3:2 to produce 20g, and put into 20g of N-ethylformamide to produce the positive electrode active material. Material slurry (viscosity: 20000 g / cm·s, viscosity change rate: 1%). The positive electrode active material slurry was coated on an aluminum (Al) thin film as a positive electrode current collector with a thickness of about 20 µm, dried at 130°C for 2 hours, and then rolled to produce a positive electrode. Lithium metal foil (foil) was used as the negative electrode. As an electrolyte, LiPF6 was added to a nonaqueous organic solvent prepared by mixing ethylene carbonate (EC) and ethylmethyl carbonate (EMC) at a volume ratio of 1:2 to produce a 1M LiPF6 nonaqueous electrolyte solution. A polyethylene separation membrane (F2OBHE, Tonen Co., thickness = 20 µm) was placed between the posi...

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Abstract

The invention relates to a solvent for coating positive electrode material of a secondary battery, a positive electrode material slurry comprising the same, and a secondary battery prepared therewith.More details in the invention show that the positive active compound can be very stably dispersed; the high-loading capacity positive electrode material slurry is provided, by that not only is a positive active substance layer with significantly reduced loading deviation formed, but also a secondary battery having significantly improved capacity feature and service property.

Description

technical field [0001] The present invention relates to a solvent for coating a positive electrode active material of a secondary battery, a positive electrode active material slurry containing the same, and a secondary battery manufactured therefrom. Background technique [0002] With the rapid development of the electronics industry and various information and communications industries including mobile communications, it meets the requirements of thinner and smaller electronic devices, such as notebook computers, netbooks, tablet computers, mobile phones, smart phones, PDAs, digital cameras, Portable electronic products such as cameras and communication terminal equipment are widely used, and therefore, more and more attention has been paid to the development of batteries as a driving power source for these equipment. [0003] In addition, with the development of electric vehicles such as hydrogen fuel cell vehicles or hybrid vehicles, and fuel cell vehicles, great attenti...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/36H01M4/505H01M4/525H01M10/0525H01M4/131H01M4/02H01M4/13H01M10/052
CPCH01M4/131H01M4/364H01M4/505H01M4/525H01M4/62H01M10/0525Y02P70/50Y02E60/10
Inventor 丁镇培申孝燮
Owner ENF TECH