Resin composition for lithium ion cell positive electrode

A technology of lithium ion battery and resin composition, applied in the direction of lithium storage battery, battery electrode, battery, etc., can solve the problems of reduced electrolyte injection, prone to cracks, reduced input and output characteristics, etc., and achieves good charge-discharge characteristics. Effect

Active Publication Date: 2014-09-17
NAT INST OF ADVANCED IND SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, in the above report, since the imide-skeleton polymer tends to coagulate when the coated electrode is dried, there are problems that the electrode becomes rigid, cracks are likely to occur due to deformation of the electrode, and the discharge capacity decreases.
In addition, polyamic acid, which is a kind of polyimide precursor, is not suitable because water accompanying imidization has a bad influence on the positive electrode active material.
Furthermore, the aggregation of polyimide reported here may lead to an increase in electrode resistance, a decrease in the injectability of the electrolyte, and a decrease in input-output characteristics.

Method used

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  • Resin composition for lithium ion cell positive electrode
  • Resin composition for lithium ion cell positive electrode
  • Resin composition for lithium ion cell positive electrode

Examples

Experimental program
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Effect test

Embodiment

[0094] In order to describe the present invention in more detail, examples are given below, but the present invention is not limited by these examples. In addition, each characteristic of an Example was evaluated by the following method.

[0095] (1) Linear thermal expansion coefficient

[0096] Each of the varnishes obtained in Synthesis Examples 1 to 20 was coated on a 4-inch silicon wafer, and pre-dried at 100° C. for 3 minutes on a hot plate. Next, the wafer with the film was heat-treated at 350° C. for 1 hour in an oven (INH-9: manufactured by KOYO THERMO SYSTEMS CO., LTD.) whose oxygen concentration was controlled to be 50 ppm or less. The coating conditions at this time were set so that the film thickness after the heat treatment would be 10 μm±1 μm.

[0097] Next, it was immersed in 45% hydrofluoric acid aqueous solution at room temperature for 10 minutes, washed with water, and the polyimide film was peeled off from the wafer. The peeled film was dried at 120° C. fo...

Synthetic example 1

[0132] Under a nitrogen atmosphere, 26.02 g (0.05 mol) of BSAA, 9.9 g (0.05 mol) of RIKACID BT-100, and 100 g of NMP were added to the four-necked flask, and stirred at 40° C. for 30 minutes. 2.18g (0.02mol) of MAP and 13.18g of NMP were added thereto, and it stirred at 60 degreeC for 1 hour. 32.96 g (0.09 mol) of 6FAP and 100 g of NMP were added after 1 hour, and it stirred at 60 degreeC for 1 hour, and then stirred at 200 degreeC for 6 hours. After cooling to room temperature for 6 hours, NMP was added to finally obtain a polyimide solution with a solid content concentration of 20%. Let this be Varnish A.

Synthetic example 2

[0134] Under a nitrogen atmosphere, 18.61 g (0.06 mol) of ODPA, 12 g (0.04 mol) of RIKACID TDA-100, and 137.25 g of NMP were added to a four-necked flask, and stirred at 40° C. for 30 minutes. 2.18 g (0.02 mol) of MAP and 10 g of NMP were added thereto, and stirred at 60° C. for 1 hour. 32.96 g (0.09 mol) of 6FAP and 50 g of NMP were added after 1 hour, and it stirred at 60 degreeC for 1 hour, and then stirred at 200 degreeC for 6 hours. After cooling to room temperature after 6 hours, the solution was poured into 3 L of pure water to precipitate a polymer, and the precipitate was separated by filtration. This sorted product was added to 3 L of pure water and filtered and sorted five more times, and then dried in an oven at 80° C. for 5 days under a nitrogen atmosphere.

[0135] After adding 80 g of NMP to 20 g of the dried powder to dissolve it, the solution was filtered with a 10 μm membrane filter to finally obtain a polyimide solution with a solid content concentration of...

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Abstract

Disclosed is a resin composition for a lithium ion cell positive electrode that imparts strong adhesiveness and electrolyte injectability and shows good charge-discharge properties and input-output properties. The resin composition for a lithium ion cell positive electrode is a resin composition for a lithium ion cell positive electrode comprising a polyimide precursor having an average thermal linear expansion coefficient under from 20 to 200 DEG C after imidation of 3 to 50 ppm and / or a polyimide having an average thermal linear expansion coefficient under from 20 to 200 DEG C of 3 to 50 ppm, as well as a positive electrode active substance, wherein the electrode active substance is one where the surface of a compound oxide comprising lithium is coated by a lithium ion conductor material.

Description

technical field [0001] The present invention relates to a resin composition for positive electrodes of lithium ion batteries. Background technique [0002] In recent years, due to the advancement of electronic technology, the high performance, miniaturization, and portability of electronic equipment have been developed. With the explosive popularity of notebook personal computers and mobile phones, the demand for rechargeable small, light, high-capacity , high energy density, high reliability of the secondary battery requirements are becoming more and more intense. [0003] In addition, in the automotive field, the introduction of electric vehicles (EV) and hybrid electric vehicles (HEV) is expected to reduce carbon dioxide emissions, and the development of secondary batteries for driving engines, which hold the key to their practical use, is also actively developing . [0004] In particular, lithium-ion secondary batteries, which are said to have the highest theoretical e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/36H01M4/485H01M4/505H01M4/525
CPCH01M2220/20H01M10/0525H01M4/62H01M4/525H01M10/052H01M4/623Y02T10/7011H01M4/5825H01M4/622H01M4/366H01M4/485H01M4/625H01M4/505Y02E60/122Y02E60/10
Inventor 幸琢宽奥山妥绘境哲男弓场智之茶山奈津子富川真佐夫
Owner NAT INST OF ADVANCED IND SCI & TECH
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