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Lithium positive electrode surface protective coating and method for preparing same

A protective coating and anode technology, applied in the field of lithium anode surface protective coating and its preparation, achieves the effects of high lithium ion conductivity, simple operation and low process cost

Active Publication Date: 2018-08-07
四川华昆能源有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The first purpose of the present invention here is to provide a method that can inhibit the growth of lithium dendrites on the lithium anode of the lithium metal battery, and solve the problem caused by the non-short circuit in the battery caused by the dendrite growth piercing the separator and contacting the battery cathode. Safety issues; it can also ensure the efficient transmission of lithium ions, effectively isolate the direct contact between lithium metal and electrolyte, reduce the generation of dead lithium, and prolong the cycle life of the electrode. Lithium anode surface protection coating

Method used

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  • Lithium positive electrode surface protective coating and method for preparing same
  • Lithium positive electrode surface protective coating and method for preparing same
  • Lithium positive electrode surface protective coating and method for preparing same

Examples

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Effect test

Embodiment 1

[0040] Such as figure 1 As shown, the lithium anode surface protective coating provided in this embodiment is formed by stacking nanoparticles with a particle size of 20-50 nm, and the pores between the stacked nanoparticles are filled with solid electrolyte particles; Silicon, solid electrolyte can use lithium sulfide.

[0041] The protective coating 2 is arranged between the lithium anode 1 and the separator 3 of the lithium metal battery to protect the lithium anode 1; wherein, the thickness of the protective coating 2 can be 2 μm, 10 μm, 18 μm or 30 μm.

[0042] The protective coating provided by the present embodiment can be made by the following methods:

[0043] Step 1: Take 40 parts of silica nanoparticles with a particle size of 20-50 nm, take 50 parts of elemental sulfur powder, put them into a ball mill tank, mix and ball mill for 2 hours to obtain a uniform composite material;

[0044] Step 2: Add 8 parts of polyoxyethylene binder to the ball mill tank to mix wit...

Embodiment 2

[0049] Such as figure 1 As shown, the lithium anode surface protective coating provided in this embodiment is formed by stacking nanoparticles with a particle size of 10-100 nm, and the pores between the stacked nanoparticles are filled with solid electrolyte particles; the nanoparticles are trioxide Dialuminum, lithium phosphide can be used as the solid electrolyte.

[0050] The protective coating 2 is arranged between the lithium anode 1 and the diaphragm 3 of the lithium metal battery to protect the lithium anode 1; the thickness of the protective coating 2 can be 6 μm, 9 μm, 15 μm or 45 μm.

[0051] The protective coating provided by the present embodiment can be made by the following methods:

[0052] Step 1: Take 60 parts of aluminum oxide nanoparticles with a particle size of 10-80nm, take 30 parts of simple red phosphorus powder, put them in a heater and heat for 2 hours to obtain a uniform composite material;

[0053] Step 2: Add 10 parts of polyacrylonitrile binder...

Embodiment 3

[0058] Such as figure 1 As shown, the lithium anode surface protective coating provided in this embodiment is formed by stacking nanoparticles with a particle size of 100-150 nm, and the pores between the stacked nanoparticles are filled with solid electrolyte particles; Silicon, solid electrolyte can use lithium nitride.

[0059] The protective coating 2 is arranged between the lithium anode 1 and the separator 3 of the lithium metal battery to protect the lithium anode 1; the thickness of the protective coating 2 can be 50 μm, 75 μm, 90 μm or 100 μm.

[0060] The protective coating provided by the present embodiment can be made by the following methods:

[0061] Step 1: Take 60 parts of silicon dioxide nanoparticles with a particle size of 100-150nm, take 60 parts of copper nitride powder, put them into a ball mill tank and heat for 2 hours to obtain a uniform composite material;

[0062] Step 2: Add 10 parts of polyvinylidene fluoride binder to the ball mill tank to mix w...

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Abstract

The invention discloses a lithium positive electrode surface protective coating and a method for preparing the same. The lithium positive electrode surface protective coating is characterized in thata protective coating mainly comprises nanometer particles which are stacked, and stacked pores of the nanometer particles are filled with solid electrolytes; the protective coating is arranged betweena lithium positive electrode and a diaphragm. The lithium positive electrode surface protective coating and the method have the advantages that the nanometer particles are stacked to form the protective coating, growth of lithium dendrites on lithium metal pole plates can be effectively inhibited by stacked structures formed by the nanometer particles by means of stacking, and accordingly the problem of diaphragm piercing due to growth of existing lithium dendrites can be solved; the solid electrolytes in the stacked pores of the nanometer particles are high in lithium ionic conductivity, accordingly, the transmission rate of the lithium metal pole plates can be guaranteed, side reaction between lithium metal and electrolyte solution can be effectively isolated, the recycling service lives of the lithium metal pole plates can be greatly prolonged, and the safety of the lithium metal pole plates can be improved.

Description

technical field [0001] The invention relates to a protective structure used between a diaphragm and a lithium electrode in a lithium metal battery, in particular to a lithium anode surface protective coating and a preparation method thereof. Background technique [0002] In recent years, with the development of science and technology, people's requirements for the energy density of energy storage devices have gradually increased. At present, the development of energy density of lithium-ion batteries has basically reached the theoretical limit of its materials, generally lower than 300Wh / kg, and the space for further improvement is limited. . In order to meet the needs of the society, the development of new energy storage systems and energy storage materials with high energy density is imperative. Metal lithium has a small molecular weight, a specific capacity as high as 3800mAh / g, and a very high mass energy density and volume energy density. In the existing lithium-ion ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M10/052H01M10/0562H01M10/058H01M2/14H01M50/403
CPCH01M4/628H01M10/052H01M10/0562H01M10/058H01M50/403Y02E60/10Y02P70/50
Inventor 魏志凯张焕叶长英黄美灵闫新秀
Owner 四川华昆能源有限责任公司
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