Anodes for lithium-ion battery cells, methods for making anodes, and batteries containing anodes

A lithium-ion battery and electrode technology, applied in the direction of electrode manufacturing, battery electrodes, electrode collector coating, etc., can solve problems such as insufficient

CN109496371BActive Publication Date: 2022-04-12HUTCHINSON SA
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2022-04-12

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Abstract

The present invention relates to a polymer composition for an electrode, which is suitable for forming an anode of a lithium ion battery, a preparation method thereof, the electrode, and a lithium ion battery comprising the electrode. The composition comprises an active material comprising graphite usable in an anode, conductive fillers and a crosslinked elastomeric binder comprising at least one hydrogenated acrylonitrile-butanediene ethylene copolymer (HNBR). According to the invention, said adhesive comprises at least one non-hydrogenated acrylonitrile-butadiene copolymer (NBR) and / or at least one said hydrogenated acrylonitrile-butadiene copolymer (HNBR), wherein HNBR has Acrylonitrile content greater than or equal to 40% and crosslinked by thermal oxidation. The preparation method comprises successively: a) mixing the ingredients of the composition, the composition comprising the active material, the elastomeric binder in non-crosslinked form and the conductive filler, to obtain a precursor mixture of the composition, b) said mixture deposited on a metal current collector so that the mixture forms a non-crosslinked film, and then c) thermally oxidizing the non-crosslinked film in air containing oxygen at a temperature of 200°C-300°C to obtain the adhesive cross-linked electrodes.
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Description

technical field

[0001] The present invention relates to a polymer composition capable of forming an electrode for the anode of a lithium-ion battery, a method of preparing the composition, such an electrode, and a lithium-ion battery wherein the or each battery cell Contains the electrode. Background technique

[0002] There are two main types of lithium secondary batteries: lithium metal batteries, in which the negative electrode consists of lithium metal (a material that poses safety concerns in the presence of a liquid electrolyte); and lithium ion batteries, in which lithium is stored in the form of ions.

[0003] A lithium-ion battery comprises at least two conductive Faraday electrodes of different polarity, the electrodes comprising a negative electrode or anode and a positive electrode or cathode, between which is an electrode separator impregnated with Li + Cationic aprotic electrolytes constitute electrical insulators. The electrolyte used in these lithium-ion ba...

Examples

Embodiment Construction

[0060] Other features, advantages and details of the invention will emerge from reading the following description of several embodiments of the invention, given as non-limiting illustrations in relation to the accompanying drawings, in which:

[0061] figure 1 is a graph illustrating the absorption spectrum measured by Fourier Transform Infrared Spectroscopy (abbreviated FTIR), showing the absorbance as a function of wavenumber for two elastomeric films composed of HNBR binder, one of which is a non-crosslinked "control" Thin films and another is crosslinked by thermal oxidation in the present invention.

[0062] "Control" example not according to the invention, and lithium ions prepared by the liquid route according to the invention Examples of battery anodes:

[0063] All of the following examples use the following:

[0064] - as the active material, called C- Artificial graphite of L-SERIES (Timcal);

[0065] - as conductive filler, purified conductive expanded gra...