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Lithium metal negative electrode, lithium battery electrolyte and lithium battery

A lithium metal negative electrode and electrolyte technology, applied to battery electrodes, negative electrodes, secondary batteries, etc., can solve problems such as unsafe, short-circuited lithium metal batteries, and achieve the effects of delaying generation, reducing overpotential, and prolonging service time

Pending Publication Date: 2021-08-24
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the short-circuit and unsafe defects of the lithium metal battery caused by the dendrite growth of the lithium metal negative electrode in the prior art, and provide a lithium metal negative electrode, a lithium battery electrolyte and a lithium battery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] This example is used to prepare lithium battery I containing lithium metal negative electrode I.

[0038] Preparation of lithium metal negative electrode I: Tutting lithium metal foil into 5 * 5cm 2 The square sheet is evenly sprayed with 50 μl of n-octandisol on the surface of the lithium metal, with a thickness of 500 nm, and naturally dried 12h to obtain a lithium foil (i.e., lithium metal negative electrode I).

[0039]Preparation of lithium battery Ⅰ: lithium metal anode Ⅰ punched into discs of 12mm diameter, assembled with the electrolyte symmetrical coin cell (i.e. Ⅰ lithium battery), the electrolyte solution containing the EC-DMC 1M LiPF6 (both 1 volume ratio) was added, followed by performance tests (i.e., AC impedance and charging and discharging cycle test).

[0040] Obtained was tested in the interface resistance of 200Ω, 0.5mA · cm -2 At a current density, it is deposited over the first week of the lithium potential of 0.1V, after 300 cycles to maintain normal ...

Embodiment 2

[0046] This embodiment for preparing a negative electrode comprising a lithium metal a lithium battery Ⅱ Ⅱ.

[0047] Preparation of the lithium metal anode Ⅱ: lithium metal foil was punched into a 5 * 5cm 2 The square pieces, uniformly coating the surface of the lithium metal 50μL of n-decyl mercaptan, adhesion thickness of 450 nm, a lithium foil 12h natural drying (i.e., a lithium metal anode Ⅱ) after treatment.

[0048] Preparation of lithium battery Ⅱ: lithium metal anode Ⅱ treated punched into discs of 12mm diameter, assembled with the electrolyte symmetrical coin cell (i.e. Ⅱ lithium battery), the electrolyte containing 1M LiPF6 in EC-DMC ( both 1 volume ratio) was added, followed by performance tests.

[0049] Obtained was tested in the interface resistance of 100Ω, 0.5mA · cm -2 At a current density, it is deposited over the first week of the lithium potential of 0.06V, after 300 cycles to maintain normal cycles, no short-circuit signal.

Embodiment 3

[0051] This embodiment for preparing a lithium battery comprising a lithium battery electrolyte Ⅰ Ⅲ of.

[0052] Preparation of lithium battery electrolyte Ⅰ: first preparing an electrolyte solution, the electrolyte solution is 1MLiTFSI of DOL-DME (both volume ratio of 1: 1) was added, followed by addition of 2wt% of lithium isopropoxide in the electrolyte solution, mixing after obtaining lithium battery electrolyte ⅰ.

[0053] Preparation of lithium battery Ⅲ: remained untreated lithium foil punched into 12mm diameter wafer as an electrode, the above-described electrolyte lithium coin cell Ⅰ assembled symmetrically, i.e., the lithium battery Ⅲ; performance test.

[0054] Obtained was tested in the interface resistance of 120Ω, 0.5mA · cm -2 At a current density, it is deposited over the first week of the lithium potential of 0.06V, after 300 cycles to maintain normal cycles, no short-circuit signal.

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Abstract

The invention relates to the technical field of lithium batteries, and discloses a lithium metal negative electrode, a lithium battery electrolyte and a lithium battery. The lithium metal negative electrode comprises a lithium metal and a lithium-loving group-containing organic matter attached to the surface of the lithium metal, wherein the organic matter containing the lithium-philic group contains at least one of a thiol group, a hydroxyl group, a carboxyl group, an amino group and halogen. The electrolyte comprises an electrolyte, a solvent and an organic matter containing a lithium-loving group, wherein the organic matter containing the lithium-loving group contains at least one of a thiol group, a hydroxyl group, a carboxyl group, an amino group and halogen. The lithium battery is a lithium battery containing the lithium metal negative electrode or the lithium battery electrolyte. Compared with the prior art, the lithium battery disclosed by the invention has the effects of reducing the overpotential of lithium in the deposition process, promoting the formation of a more uniform and compact structure of lithium metal in the deposition process and delaying the generation of lithium dendrites.

Description

Technical field [0001] The present invention relates to the technical field of lithium batteries, and more particularly to a lithium metal negative electrode, a lithium battery electrolyte, and a lithium cell. Background [0002] Lithium-ion battery reservoirs have high energy density and portable advantages. After 20 years of development, it has gradually obtained market recognition, and it has achieved large-scale applications in the fields of personal electronic equipment, electric vehicles. In known electrode materials, lithium metal negatives are 3860 mAh · g -1 High-capacity and most negative potential (-3.040V vs. standard hydrogen electrode) becomes a "holy cup" of the energy storage industry, and is concerned by the researchers. [0003] In the 1970s, the primary battery of the lithium metal has achieved commercial application in many fields such as cardiac pacemakers, space exploration, and oil exploration. However, when metal lithium is a secondary battery negative ele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525H01M10/0567
CPCH01M4/382H01M4/362H01M4/628H01M10/0525H01M10/0567H01M2004/027Y02E60/10
Inventor 康丹苗梁文斌马浩初
Owner CHNA ENERGY INVESTMENT CORP LTD
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