Lithium battery negative electrode and preparation method thereof, lithium battery and application

A lithium battery and negative electrode technology, applied in the fields of lithium batteries and applications, lithium battery negative electrodes and their preparation, can solve problems such as unstable characteristics, hidden dangers of battery safety, and decreased battery cycle performance, and achieve excellent safety performance and cycle performance, The effect of suppressing the formation of SEI film and improving the anti-reduction ability

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A lithium battery and negative electrode technology, applied in the fields of lithium batteries and applications, lithium battery negative electrodes and their preparation, can solve problems such as unstable characteristics, hidden dangers of battery safety, and decreased battery cycle performance, and achieve excellent safety performance and cycle performance, The effect of suppressing the formation of SEI film and improving the anti-reduction ability

CN103855358BActive Publication Date: 2017-10-17TONGDING INTERCONNECTION INFORMATION CO LTD

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[0062] Correspondingly, the embodiment of the present invention also provides a method for preparing the negative electrode of the above-mentioned lithium battery. For the process flow of the method for preparing the negative electrode of the lithium battery, please refer to image 3 , see also figure 2 . Lithium battery negative electrode comprises the following steps:

[0063] Step S01. Prepare a slurry containing an inorganic salt material that is electrically insulating but conductive to lithium ions: mix the inorganic salt material that is electronically insulating but conductive to lithium ions with a solvent to prepare a slurry;

[0064] Step S02: coating the slurry on the negative electrode: coating the slurry prepared in step S01 on the negative electrode containing the negative electrode active material layer 2, and drying to form the protective layer 3 to obtain the negative electrode of the lithium battery.

[0065] Specifically, in the above step S01 , the mate...

Embodiment 1

[0088] A lithium battery negative electrode and a preparation method thereof, and a lithium ion battery:

[0089] The microstructure of the negative electrode of the lithium battery is as follows: figure 2 As shown, the negative electrode of the lithium battery includes a current collector 1, a negative electrode active material layer 2 bonded to the surface of the current collector 1, and a protective layer 3 bonded to the surface of the negative electrode active material layer 2 and the pore walls of the negative electrode active material layer 2. Among them, the protective layer 3 contains lithium sulfate.

[0090] 1.1 The negative electrode of the lithium battery is prepared as follows:

[0091] 1.1.1 Preparation of the negative electrode: 94.5g of the negative electrode active material artificial graphite, 2g of the conductive agent super p, 1.5g of the thickener sodium carboxymethyl cellulose, 4g of the binder styrene-butadiene rubber emulsion (solid content 50% ) int...

Embodiment 2

[0100] A lithium battery negative electrode and a preparation method thereof, and a lithium ion battery:

[0101] The structure of the lithium battery negative electrode is the same as that of the lithium battery negative electrode in Example 1, except that the protective layer contains lithium dihydrogen phosphate, and the concentration of the protective layer precursor lithium dihydrogen phosphate solution is 8%.

[0102] 2.1 The negative electrode of the lithium battery is prepared as follows:

[0103] 2.1.1 Preparation of negative electrode: refer to the preparation of 1.1.1 negative electrode in the steps in Example 1;

[0104] 2.1.2 Preparation of lithium dihydrogen phosphate slurry containing electronic insulation and lithium ion conduction: slowly add 80 grams of lithium dihydrogen phosphate into a beaker containing 920 grams of deionized water, stir evenly, and obtain a concentration of 8% lithium dihydrogen phosphate solution;

[0105] 2.1.3 Negative electrode modi...

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Abstract

The invention discloses a lithium battery negative electrode as well as a preparation method thereof, a lithium battery and application. The lithium battery negative electrode comprises a current collector, a negative active material layer which is connected onto the surface of the current collector, and protective layers which are respectively connected onto the surface of the negative active material layer and a porous wall of the negative active material layer. The contact between an electrolyte solvent and the surface of the negative electrode can be inhibited through the protective layers of the lithium battery negative electrode, so that the consumption of lithium ions can be reduced when an SEI (solid electrolyte interphase) membrane on the surface of the lithium battery negative electrode is formed and repaired, and the cycling performance of the lithium battery can be remarkably improved; the formation of the SEI membrane on the surface of the lithium battery negative electrode is inhibited, the heat production when the SEI membrane on the surface of the negative electrode is decomposed at high temperature and the exothermic reaction generated when the electrolyte is contacted with the negative electrode after the SEI membrane is decomposed can be avoided, and the safety of the lithium battery can be improved. The preparation method of the lithium battery negative electrode adopts a simple process and easily controlled conditions, is high in efficiency and applicable to industrialized production.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a negative electrode of a lithium battery, a preparation method thereof, a lithium battery and an application thereof. Background technique [0002] Compared with other batteries, lithium-ion batteries have the advantages of high energy density, long cycle life, small self-discharge, and no memory effect. They are widely used in mobile phones and portable notebook computers, and gradually replace nickel-metal hydride, nickel-cadmium, and lead-acid batteries. Entering the fields of electric vehicles and electric tools has become the focus of researchers in recent years. With the wide application of lithium-ion batteries, their safety performance has been paid more and more attention. [0003] During the use, storage, and transportation of lithium-ion batteries, accidents such as external short circuits will occur, and the batteries will overheat due to the impact of...

Claims

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Application Information

Patent Timeline

17 Oct 2017

Publication

CN103855358B

IPC: H01M4/13; H01M4/139; H01M10/0525

CPC: H01M4/13; H01M4/139; H01M10/0525; Y02E60/10

Inventors: 罗涛