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Electrode-forming compositions

A composition and positive electrode technology, applied in the direction of positive electrodes, electrode manufacturing, battery electrodes, etc., can solve the problems of rapid increase in slurry viscosity and gelation

Pending Publication Date: 2020-12-22
SOLVAY SOLEXIS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, PVDF, especially when used in the form of a slurry to form the positive electrode, has an important disadvantage that the viscosity of the slurry often increases rapidly, leading to the formation of a gel

Method used

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  • Electrode-forming compositions
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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0145] Example 1: Preparation of polymer (A) and comparative polymers:

[0146] In a 4 liter reactor equipped with an impeller running at 650 rpm, demineralized water and a suspending agent (as in Table 1) of 1.5 g / kg Mni (initial amount of monomer added in the reactor before setting the temperature) were introduced in sequence detailed in). The reactor was purged at 11°C with a vacuum (30 mmHg) followed by a nitrogen purge. Then 5.0 g of initiator was introduced. At a speed of 880 rpm, acrylic acid (AA) and perfluoromethyl vinyl ether (PMVE) were introduced. Finally, vinylidene fluoride (VDF) is introduced into the reactor. The amounts of AA, PMVE and VDF in polymer (A) used in the preparation of polymer (A) according to the invention (and in comparative polymer (Comp)) are reported in Table 1 . The reactor was gradually heated up to a setpoint temperature of 55°C and the pressure was fixed at 120 bar. The pressure was kept constant equal to 120 bar by feeding an aqueou...

example 2

[0153] Example 2: General procedure for preparing electrode-forming compositions

[0154] Electrode-forming compositions were prepared by dissolving polymer (comparative), polymer (A-1) and polymer (A-2) in N- Methylpyrrolidone (NMP) to a concentration of 8 wt%, then predetermined amounts of positive electrode active material, conductive material and residual NMP were added to the polymer in NMP solution and mixed well with a Dispermat apparatus equipped with a flat PTFE disk . The total solids concentration of the resulting slurry was 70% or 75% by weight. Details of the electrode-forming composition prepared in Example 2 are reported in Table 3.

[0155] table 3

[0156]

example 3

[0157] Example 3: Electrode-forming composition gel evaluation

[0158] Compositions (C-1) and (C-3) were prepared, followed by visual observation to check their appearance.

[0159] The flowability of the compositions was evaluated at different aging times up to 48 hours, based on the ability and quality of the compositions to be cast on PET foil (50 μm wet thickness). The results are reported in Table 4.

[0160] Table 4

[0161]

[0162] Composition (C-1) failed to provide high quality castings 4 hours after preparation. Clumping started to appear in the composition and it was unusable. In contrast, composition (A-2) showed good stability at least until 48 h after preparation.

[0163] In view of the above, it was found that the positive electrode-forming composition (C) according to the present invention is characterized by improved anti-gelling properties due to the presence of the polymer (A) comprising the binder (B).

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Abstract

The present invention pertains to an electrode-forming composition comprising copolymers vinylidene fluoride / fluoroalkylvinylether, to a process for their manufacture and to the use thereof for manufacturing electrodes for high-capacity nickel-rich lithium ion batteries.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS [0002] This application claims priority to European Application No. 18305615.9, filed on May 17, 2018, the entire content of which is hereby incorporated by reference for all purposes. technical field [0003] The present invention relates to an electrode-forming composition comprising a copolymer of vinylidene fluoride / fluoroalkyl vinyl ether; a method for its manufacture; and its use for the manufacture of electrodes for high-capacity nickel-rich lithium-ion batteries. Background technique [0004] The generation and storage of energy has long been the subject of research and development. Electrical energy stores in compact form that are easy to charge and discharge, such as rechargeable electrochemical cells and / or electrochemical capacitors, are of particular interest. High-power, high-energy, rechargeable energy storage devices are required to power devices with a wide range of electrical requirements. Examples of such ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/505H01M4/525H01M4/62H01M4/1391H01M10/052H01M4/02
CPCH01M4/131H01M4/1391H01M4/505H01M4/525H01M4/623H01M10/052H01M2004/028Y02E60/10H01M4/0404H01M10/0525
Inventor M·A·斯伯阿菲科S·布鲁斯奥J·A·阿布斯勒梅A·吉利姆G·布里纳蒂
Owner SOLVAY SOLEXIS