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Secondary battery electrode, secondary battery, and method for producing same

A secondary battery, manufacturing method technology, applied in battery electrodes, secondary batteries, non-aqueous electrolyte battery electrodes, etc., can solve the problems of insufficient contact, hindering lithium ion conduction, lack of flexibility of electrolyte membrane, forming processability, etc. , to achieve the effect of improving ionic conductivity

Active Publication Date: 2019-08-13
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, these ceramic-based electrolyte membranes have inherent problems such as lack of flexibility and formability.
Therefore, the contact between the electrolyte particles and the electrode active material particles tends to be insufficient, which hinders the conduction of lithium ions between the particles.

Method used

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  • Secondary battery electrode, secondary battery, and method for producing same
  • Secondary battery electrode, secondary battery, and method for producing same
  • Secondary battery electrode, secondary battery, and method for producing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] The adsorption effect of Li ions on the surface of the electrode conductive material was evaluated. The organic solvent uses tetraglyme (G4), the lithium salt uses lithium bis(trifluorosulfonyl)imide (LiTFSI), the electrode conductive agent uses acetylene black (average particle size 48nm), and the binder uses PTFE. A composite of acetylene black and electrolyte solution was produced as follows.

[0076] First, after vacuum-drying acetylene black at 120°C, acetylene black was dispersed in toluene and refluxed at 100°C. Furthermore, 3-aminopropyltriethoxysilane was added as a surface treatment agent to this liquid mixture, and it refluxed for 6 hours, stirring, and made it uniform. Then, the reaction solution was collected and washed sufficiently with methanol, and the unreacted surface treatment agent was hydrolyzed with a water-methanol solution to obtain surface-modified acetylene black.

[0077] Next, G4 and LiTFSI were mixed at a molar ratio of G4:LiTFSI=1:1 to pr...

Embodiment 2

[0080] The surface treatment agent was the same as in Example 1 except that diethylphosphinoethyltriethoxysilane was used.

Embodiment 3

[0082] The surface treatment agent was the same as in Example 1 except that 3-aminopropyltrimethoxysilane was used.

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Abstract

The present invention improves the ionic conductance of a secondary battery electrode. Thus, a secondary battery electrode containing an electrode active material, an electrode conductive agent, and an ion conductive material, wherein: the ion conductive material is held by the electrode conductive agent, a coating is formed on the surface of the electrode conductive agent, and the surface potential of the electrode conductive agent is positive; and the materials used to form the coating include, for example, 3-aminopropyltriethoxysilane, 3-aminopropyltrimethoxysilane, 4-aminobutyltriethoxysilane, aminophenyltrimethoxysilane, 3-aminophenyltrimethoxysilane, m-aminophenyltrimethoxysilane, p-aminophenyltrimethoxysilane, 3-aminopropyltri(methoxyethoxy)silane, 11-aminoundecyltriethoxysilane, and the like.

Description

technical field [0001] This invention relates to the electrode for secondary batteries, a secondary battery, and their manufacturing methods. Background technique [0002] Lithium ion secondary batteries capable of achieving high voltage and high energy density are used in a wide range of applications ranging from in-vehicle applications such as electric vehicles and hybrid vehicles to personal computers and portable communication devices. [0003] The central subject in the research and development of lithium ion secondary batteries is to achieve both further improvements in energy density and improvements in the safety and reliability of the batteries themselves. With this goal in mind, in recent years, the development of solid electrolyte membranes having high lithium ion conductivity has been vigorously advanced. The background of requiring solidification of the electrolyte is that there are safety problems that arise when an organic electrolyte is used as an electrolyt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/139H01M4/62H01M10/056
CPCH01M4/13H01M4/139H01M4/62H01M10/056
Inventor 上田克川治纯
Owner HITACHI LTD