Binder for lithium ion batteries and electrode and separator using same

A lithium-ion battery and adhesive technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, lithium batteries, etc., can solve problems such as residual starting materials

Active Publication Date: 2020-05-15
ATTACCATO LLC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reason for this is not clear, but it is considered that the starting material used for the synthesis of the active material containing Li remains, or the active material itself generates lithium hydroxide, etc.

Method used

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  • Binder for lithium ion batteries and electrode and separator using same
  • Binder for lithium ion batteries and electrode and separator using same
  • Binder for lithium ion batteries and electrode and separator using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 15

[0237] The NCM523 electrodes of Example 15, Example 16, Reference Example 7, and Comparative Example 2 were test cells equipped with electrode binders shown in Table 7. For the test cell, use NCM523 electrode (test electrode) as positive electrode, SiO electrode as negative electrode, polyolefin microporous membrane (PP / PE / PP) as separator, 1 mol / L LiPF as electrolyte 6 (EC:DEC=50:50% by volume) to produce a CR2032 type coin battery.

[0238] The SiO electrode is produced in the following manner: SiO, PVA (polymerization degree 2800), acetylene black, and VGCF are combined so that the solid ratio becomes 94:10:4:1 mass %, and the rotation and revolution type mixer (Thinky Company Manufacture, Refining Taro, 2000rpm, 15 minutes) for kneading, the slurry obtained by slurrying is coated on a copper foil with a thickness of 40 μm, pre-dried at 80°C, and then dried under reduced pressure (160°C, 12 hours). The capacity density of SiO electrode is 3.2mAh / cm 2 . It should be note...

Embodiment 17

[0260] The test batteries of Example 17, Example 18, Example 19, Example 20, and Comparative Example 3 were test batteries provided with separators 1 to 5 shown in Table 8. The test battery (NCM111 / graphite full battery) is made by using the NCM111 electrode as the positive electrode, the graphite electrode as the negative electrode, the test separators 1 to 5 as the separator, and 1 mol / L LiPF as the electrolyte 6 (EC: DEC = 50: 50% by volume), CR2032-type coin cells were assembled and left to stand in an environment of 80° C. for 1 hour to produce. In addition, the coating layer of the separator was provided on the side of the positive electrode.

[0261] The NCM111 electrode was produced by mixing NCM111, PVdF (weight-average molecular weight: 280,000), and acetylene black so that the solid ratio was 91:5:4% by mass, and using a rotation-revolution mixer (manufactured by Thinky Corporation) , Rentaro, 2000rpm, 15 minutes) for kneading, the slurry obtained by slurrying was ...

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Abstract

Provided is a nonaqueous binder for electrodes or separators, which is used in a lithium ion battery that has excellent cycle life characteristics at high temperatures. A nonaqueous binder for electrodes or separators of lithium ion batteries, which is obtained by complexing cellulose nanofibers and a thermoplastic fluorine-based resin, is characterized in that the cellulose nanofibers have a fiber size (diameter) of from 0.002 Mu m to 1 Mu m (inclusive), a fiber length of from 0.5 Mu m to 10 mm (inclusive), and an aspect ratio ((fiber length of cellulose nanofibers) / (fiber diameter of cellulose nanofibers)) of from 2 to 100,000 (inclusive).

Description

technical field [0001] The present invention relates to a binder used in an electrode or a separator of a lithium ion battery, an electrode and a separator using the same. Background technique [0002] The application fields of secondary batteries are expanding from electronic equipment to automobiles and large-scale power storage systems, and its market size is expected to grow into an industry of more than 10 trillion yen. In particular, information and communication devices such as mobile phones, smartphones, and tablet terminals have achieved an astonishing spread, and the worldwide penetration rate has exceeded 30%. [0003] Moreover, the range of application of secondary batteries has also expanded to power sources for next-generation vehicles represented by electric vehicles (EV), plug-in hybrid electric vehicles (PHEV), hybrid electric vehicles (HEV), and the like. In addition, secondary batteries began to be used for household backup power supply, storage of natura...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62C08B3/12C08L1/00C08L27/12H01M2/16H01M4/13H01M50/426H01M50/429
CPCC08B3/12Y02E60/10H01M50/44H01M50/446H01M50/4295H01M50/426H01M50/417H01M4/622H01M4/623H01M50/403H01M10/0565H01M50/46H01M2300/0085H01M4/13H01M4/139H01M10/0585H01M10/0587H01M10/0568H01M10/0569C08L27/16C08K9/04C08K7/02C08L1/02Y02P70/50H01M50/429C08K3/22H01M10/052C08B3/20C08L1/10C08L1/32C08L2203/20C08L2205/16H01M4/131H01M4/505H01M4/525H01M10/0525
Inventor 向井孝志池内勇太坂本太地山下直人石黑亮中村谕
Owner ATTACCATO LLC
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