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High solids content paste formulations for secondary battery electrode

A high solid content, secondary battery technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, electrode manufacturing, etc.

Inactive Publication Date: 2017-08-18
APPLIED MATERIALS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Additionally, the slot die pattern coating process deposits additional material at the leading and end edges of the coating, thereby causing coating uniformity issues

Method used

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  • High solids content paste formulations for secondary battery electrode
  • High solids content paste formulations for secondary battery electrode
  • High solids content paste formulations for secondary battery electrode

Examples

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Effect test

example 1

[0033] In embodiments, examples of water-based high solids pastes including carbon (graphite) can be achieved by using figure 2 prepared according to the process flow in , as described above. The specific composition and physical properties are provided in Table 1. Natural graphite (energy grade material) is a specific example of a material containing carbon (graphite). Carboxyl-methyl-cellulose (CMC) MW 90,000 is a specific example of a binder material. 27000 is an example of a hyperdispersant used to fine tune the viscosity of the paste.

[0034] Table 1 includes water-based high solids pastes of graphite and CMC binders.

[0035]

[0036] a American Brookfield dial reading viscometer HBT model, mandrel CPE-52, 10s -1 , 25℃

[0037] b Ink / Paste Density Cup, 20℃

example 2

[0039] In embodiments, another example of a water-based high solids paste including carbon (graphite) can be obtained by using figure 2 prepared according to the process flow in , as described above. The specific composition and physical properties are provided in Table 2. Natural graphite (energy grade material) is a specific example of a material containing carbon (graphite). Hydroxyethyl cellulose is a specific example of a binder material. 27000 is an example of a hyperdispersant used to fine tune the viscosity of the paste.

[0040] Table 2 includes high solids pastes of graphite and hydroxyethyl cellulose binders.

[0041]

[0042] a American Brookfield dial reading viscometer HBT model, mandrel CPE-52, 10s -1 , 25℃

[0043] b Ink / Paste Density Cup, 20℃

example 3

[0045] In embodiments, yet another example of a water-based high solids paste comprising carbon (graphite) can be achieved by using figure 2 prepared according to the process flow in , as described above. The specific composition and physical properties are provided in Table 3. Natural graphite (energy grade material) is a specific example of a material containing carbon (graphite). Hydroxyethylcellulose, CMC (MW 90000) and polymethylmethacrylate / polyethylmethacrylate are specific examples of binder materials. 27000, a polymeric dispersant available from Lubrizol Ltd., USA, is an example of a hyperdispersant used to fine tune the viscosity of the paste.

[0046] Table 3 includes water-based high solids pastes of graphite and CMC, hydroxyethyl cellulose and PMMA / PEMA binders.

[0047]

[0048]

[0049] a American Brookfield dial reading viscometer HBT model, mandrel CPE-52, 10s -1 , 25℃

[0050] b Ink / Paste Density Cup, 20℃

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Abstract

A high solids content paste for fabrication of secondary battery electrodes may comprise: a negative active material or a positive active material; a binder; a solvent; and a hyperdispersant; wherein the high solids content paste has a specific viscosity chosen for a particular coating tool and a composition such that the high solids content paste will maintain a deposited shape after coating at least until the high solids content paste has dried and wherein the dry coating thickness is in the range of 5 microns to 300 microns. The high solids content paste with negative active material has a viscosity in the range of 30,000 cP to 45,000 cP and a corresponding density of 1.40 g / cc to 1.43 g / cc. The high solids content paste with positive active material has a viscosity in the range of 25,479 cP to 47,184 cP and a corresponding density of 2.72 g / cc to 2.73 g / cc.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS [0002] This application claims the benefit of US Provisional Application No. 62 / 056,353, filed September 26, 2014, which is incorporated by reference into this application in its entirety. technical field [0003] Embodiments of the present disclosure relate generally to electrochemical energy storage devices, such as batteries, and more particularly, but not exclusively, to high solids paste formulations for secondary battery electrodes. Background technique [0004] Conventional battery electrodes are manufactured, for example, by using slurries consisting of active materials with suitable binders and carbon additives, which are coated on thin metal sheets using a slot-die tool. foil current collector. The electrodes are dried, rolled and cut to size to make wound or stacked cells. To avoid cracking of the coating, especially of thicker coatings, the coating should be dried very slowly. Furthermore, the slot die pattern c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62
CPCH01M4/622H01M4/0414H01M4/139H01M4/583H01M4/625Y02E60/10Y02P70/50H01M4/13H01M4/62H01B1/22
Inventor 苏布拉曼亚·P·赫尔勒
Owner APPLIED MATERIALS INC
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