Improved secondary Li ion battery and Li capacitor electrode compositions

A lithium-ion, water electrode technology, applied in the direction of hybrid capacitor electrodes, battery electrodes, secondary batteries, etc., can solve the problems of expensive coating steps and drying steps, economically unfeasible, expensive, etc.

Active Publication Date: 2019-07-23
HENKEL KGAA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

US 2010 / 0248027 has attempted to cast electrode slurries in multiple steps, which is undesirable because it is more expensive and requires additional coating and drying steps, making it economically unviable
The downside of adhesives and conductive primers to date is that they are very expensive, so their cost of use may be a limiting factor
JP 2004-342504 describes various methods of attempting to mitigate the performance degradation caused by hydrofluoric acid, these methods are generally not commercially useful because they use expensive additives, or lead to other question
Additionally, the use of adhesives and primers still requires multiple processing steps

Method used

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  • Improved secondary Li ion battery and Li capacitor electrode compositions
  • Improved secondary Li ion battery and Li capacitor electrode compositions
  • Improved secondary Li ion battery and Li capacitor electrode compositions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment A

[0064] In a first series of experiments, the invention was elucidated as follows. Test positive electrodes were prepared using the three slurries described in Table 3 below. For the preparation of all electrode slurries, the solvent N-methyl-2-pyrrolidone (NMP) was used. Example C 1 is a control sample using a standard preparation of binder and other components in the electrode paste. Use the metal chelating polymer K of the embodiment of the invention to prepare embodiment K 1 . Polymer K was prepared using poly(4-hydroxystyrene) as component A, paraformaldehyde as component B, and N-methyl-D-glucamine as the amines of component C. Example G was prepared using metal chelating polymer G, another inventive example 1 . Polymer G was prepared using poly(4-hydroxystyrene) as component A, paraformaldehyde as component B and N-methylethanolamine as component C amines.

[0065] The examples were prepared by adding them in the order listed to the sample cups with lids in a dry ...

Embodiment B

[0075]In view of the surprisingly good adhesion of the sample of Example A prepared using polymer K according to the invention, in the next series of experiments polymer K was compared with a highly adhesive comparative polymer. The benefits of using polymer binders with high adhesion values ​​not according to the invention were compared with metal chelating polymer K according to the invention to determine whether the results for polymer K were simply due to better adhesion combine. In the next series of experiments, an adhesive polyacrylonitrile with a high adhesion value, Example P, which is not a metal chelating polymer according to the invention, was compared with a comparative sample, Example C 2 And a sample prepared with metal chelating polymer K, Example S, for comparison. In addition, the content of polymer K in Example S was higher than that in previous experiments (see Table 3, Example K 1 ) uses 75% less polymer. Finally, an active material different from that ...

Embodiment 1

[0091] The electrode material intermediate of Example 1 was prepared by mixing: 2.52 grams of Polymer G stock solution, 8.46 grams of poly(methyl methacrylate) (PMMA) stock solution and 13.76 grams of pigment paste. The composition was then reduced to 9% solids by weight using the solvent NMP prior to use on the substrate. A stock solution of Polymer G was prepared as follows. An amount of 265 grams of Polymer G was added to 1000 ml of deionized water, mixed and then decanted. The polymer is then collected using a spatula. Then 29.42 grams of recovered Polymer G was dissolved in 69.92 grams of NMP to obtain a stock solution of Polymer G. A PMMA stock solution was prepared by mixing 7.03 grams of acrylic acid methacrylate copolymer with 47.85 grams of NMP. The mixture was heated to 65 °C in a sealed glass bottle to dissolve the PMMA. Cool the PMMA solution before use. Pigment pastes were prepared as follows. 188.11 grams of NMP were added to the stainless steel vessel. W...

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Abstract

The invention discloses an electrode material designed to be a dry in place deposit comprising at least one metal chelating polymer; an active material capable of reversibly intercalating lithium ions; a plurality of electrical conductor particles; a binder polymer. The electrode material is formed into a slurry using a non-aqueous solvent. The metal chelating polymer may be a reaction product ofa polyphenolic polymer; an aldehyde, a ketone, or mixtures thereof; and an amine. The electrode material slurry is deposited on a current collector and dried to form a positive electrode in a secondary lithium ion battery. The deposited electrode material has high flexibility, adhesion to the current collector, resistance to electrolyte damage, and low electrical resistance. The electrode materialforms a superior positive electrode at a relatively low additional cost and with no increase in process complexity.

Description

technical field [0001] The present invention generally relates to electrical energy storage devices, such as secondary (ie, rechargeable) lithium-ion batteries, lithium-ion capacitors, and the like, that contain non-aqueous electrolytes. More specifically, the present invention provides positive electrodes for use in these devices that have improved resistance to damage by electrolytes and acids in the electrolyte and improved adhesion of the electrode material to the current collector of the electrode. Also provided are methods of preparing a positive electrode with fewer manufacturing steps, and compositions for preparing the positive electrode. Background technique [0002] In a secondary lithium-ion battery, the main components are a positive electrode, a negative electrode, a permeable separator usually located between the positive and negative electrodes, and a non-aqueous electrolyte solution. The positive and negative electrodes include a current collector covered w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/13H01M10/052H01M4/137H01M4/1399
CPCH01M4/131H01M4/622H01M10/0525H01M4/525H01M4/505H01M4/485H01M4/5825H01M4/0404H01M4/136H01M4/1391H01M4/1397H01M4/623H01M4/625H01M2004/028Y02E60/10H01M4/137H01M4/604H01M4/1399H01G11/50H01M4/139H01M4/628
Inventor J·齐默尔曼J·D·麦吉A·M·达尔J·J·科莫福特D·R·麦考密克G·T·唐纳森
Owner HENKEL KGAA
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