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Compositions and methods for dry electrode films including elastic polymer binders

An elastic polymer, dry electrode technology, applied in hybrid capacitor electrodes, electrode manufacturing, battery electrodes, etc., can solve problems such as undesired device performance

Pending Publication Date: 2022-01-14
MAXWELL TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, energy storage devices including electrodes comprising PTFE binders may exhibit undesirable device performance, such as increased irreversible capacity loss during redox processes

Method used

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  • Compositions and methods for dry electrode films including elastic polymer binders
  • Compositions and methods for dry electrode films including elastic polymer binders
  • Compositions and methods for dry electrode films including elastic polymer binders

Examples

Experimental program
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Embodiment

[0074] electrode material

[0075] SMG-A5 graphite and LiNi 0.6 mn 0.2 co 0.2 o 2 (NMC622) The powder was used as it was without drying. Therefore, the powder may contain limited residual water due to atmospheric moisture. Elastomeric polymer binders include polyethylene (PE), polyethylene oxide (PEO), and polyvinylidene fluoride (PVDF) (with a wide range of molecular weights), homopolymers, and copolymers. In some embodiments, the particle size and distribution of the binder polymer can play a role in maintaining the mechanical stability of the free-standing electrode film. A polytetrafluoroethylene (PTFE) binder was also used in Comparative Examples. Table 1 shows the specifications of the active materials and binders tested below.

[0076] Table 1: Active material and binder specifications

[0077]

[0078]

[0079] Dry coated electrode formulation

[0080] Table 2 provides the examined electrode formulations comprising active material and binder. The dr...

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Abstract

Provided herein are dry process electrode films, and energy storage devices incorporating the same, including an elastic polymer binder. In some embodiments, the dry process electrode films are PTFE-free or comprise an insubstantial amount of PTFE. The electrode films exhibit improved mechanical and processing characteristics. Also provided are methods for processing such elastic polymer binders, and for incorporating the elastic polymer binders in electrode films.

Description

[0001] Citation of Priority Application [0002] This application claims the benefit of priority to U.S. Provisional Patent Application No. 62 / 826,273, filed March 29, 2019, which is hereby incorporated by reference in its entirety for all purposes. technical field [0003] The present disclosure generally relates to dry energy storage device electrodes, energy storage devices implementing such electrodes, and related methods. Background technique [0004] Conventional energy storage devices and related methods generally include a binder material combined with active electrode materials and other additives and processed in such a way as to form an electrode film. Electrode films are typically applied to one or more other layers of material to form electrodes. Typically, a negative electrode (anode) and a positive electrode (cathode) are formed, a separator is placed between them, and inserted into a case with an electrolyte to form various types of energy storage devices. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01G11/28
CPCH01M4/04H01G11/38H01G11/86H01G11/26Y02E60/10Y02T10/70H01M4/13H01M4/133H01M4/622H01M4/0435H01M4/1393H01M2004/021H01M4/137H01M4/139H01M4/602
Inventor 申俊昊希厄·明赫·东
Owner MAXWELL TECH INC