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Negative electrode with SEI protective layer, preparation method of negative electrode and lithium/sodium metal battery

A protective layer and negative electrode technology, applied in the field of lithium/sodium metal batteries, can solve the problems of the volume change of the negative electrode SEI protective layer, the interface volume change of the alloy protective layer, fragility, etc., and achieves low preparation cost, novel preparation method and operating conditions. simple effect

Inactive Publication Date: 2019-02-19
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the alloy protective layer also faces the problem that as the cycle progresses, the alloy protective layer will produce a change in interface volume and thus crack.
[0006] Therefore, how to simultaneously solve the problem of fragility caused by the volume change of the negative electrode SEI protective layer, as well as the problems of poor mechanical strength and low lithium ion conductivity, is the direction of research in this field.

Method used

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  • Negative electrode with SEI protective layer, preparation method of negative electrode and lithium/sodium metal battery
  • Negative electrode with SEI protective layer, preparation method of negative electrode and lithium/sodium metal battery
  • Negative electrode with SEI protective layer, preparation method of negative electrode and lithium/sodium metal battery

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preparation example Construction

[0056] The present invention also provides a method for preparing a negative electrode with an SEI protective layer, comprising the following steps:

[0057] A) dissolving the inorganic raw material and the organic polymer in a solvent, and obtaining a mixed solution after ultrasonic treatment;

[0058] The inorganic raw material is halide salt or graphene oxide; the halide salt is one or more of zinc halide, indium halide and gallium halide;

[0059] The organic polymer is one or more of polymethylacrylate, polydimethylsiloxane, polyethylene oxide and polyethersulfone;

[0060] B) under an inert atmosphere, the negative electrode is contacted with the mixed solution to react to obtain a negative electrode with an SEI protective layer;

[0061] The negative electrode is lithium metal or sodium metal.

[0062] In the invention, the inorganic raw material and the organic polymer are dissolved in a solvent, followed by ultrasonic treatment and vacuum defoaming in order to obtai...

Embodiment 1

[0074] Weigh tin protochloride dihydrate (SnCl 2 2H 2 O), 100mg; Polyvinylidene fluoride-hexafluoropropylene polymer (PVDF-HFP), 500mg; Be dissolved in nitrogen methyl pyrrolidone and be made into the solution of 5g, stir at room temperature for 5 hours, make polyvinylidene fluoride-hexafluoropropylene The polymer is fully dissolved, and then placed in an ultrasonic wave for 5 hours, so that the inorganic salt polymer is more uniformly dispersed in the blend solution, and solution A is obtained.

[0075] Under an inert atmosphere (oxygen content figure 1 shown;

[0076] Absorb the excess solution with dust-free paper on the reacted metal lithium sheet, and leave it to dry in the glove box. Since tin can be reduced by strong reducing metal lithium on the surface of metal lithium to obtain metal tin, metal tin can be further combined with Lithium metal forms a lithium-tin alloy with high lithium ion conductivity, thereby obtaining a lithium metal negative electrode with alloy ...

Embodiment 3

[0084] Tested the SEI protective film obtained in embodiment 3 (code name PFSI-106), embodiment 15 (code name PZI-106), embodiment 21 (code name PBI-106) and embodiment 27 (code name PII-106) at 25 ℃ Under the ionic conductivity, the results are as follows:

[0085] SnCl in Example 3 2 The ionic conductivity of the LiSn alloy SEI protective film formed with lithium is 1.759×10 - 4 Scm -1 ;

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Abstract

The invention provides a negative electrode with an SEI protective layer. The negative electrode comprises a negative electrode body and the SEI protective layer compounded on the surface of the negative electrode body; the SEI protective layer comprises an inorganic phase and an organic polymer phase; the concentration of the inorganic phase is gradually reduced from the side, in contact with thenegative electrode body, of the SEI protective layer; the concentration of the organic polymer phase is gradually increased from the side, in contact with the negative electrode body, of the SEI protective layer; the inorganic phase comprises a compound shown in formula I or graphene oxide, wherein R is Li or Na, and M is one or more of Zn, In and Sn; the organic polymer phase is one or more of polymethyl acrylate, polydimethylsiloxane, polyoxyethylene and polyether sulfone. The negative electrode is provided with the protective layer with the two separated phases and has flexibility of polymers and rigidity of the alloy protective layer, and the stability and safety of the negative electrode are improved. The invention further provides a preparation method of the negative electrode withthe SEI protective layer and a lithium / sodium metal battery.

Description

technical field [0001] The invention belongs to the technical field of lithium / sodium metal batteries, and in particular relates to a negative electrode with an SEI protective layer, a preparation method thereof and a lithium / sodium metal battery. Background technique [0002] At present, protecting metal lithium anode by constructing artificial SEI (solid-electrolyte interface) protective layer has been proved to be an effective method for metal lithium protection; this method can be divided into organic polymer artificial SEI protective layer, inorganic salt Artificial SEI protective layer, alloy protective layer, etc. The main basis is to build a lithium ion conductive and electronically insulating protective layer on the surface of the lithium metal negative electrode that can isolate the lithium metal negative electrode from the electrolyte, so that the lithium metal negative electrode can avoid being corroded by the electrolyte during the cycle and Inhibit the growth ...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M4/139H01M10/052
CPCH01M4/13H01M4/139H01M10/052Y02E60/10
Inventor 赵斐邓伟梁珊珊周旭峰刘兆平
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI