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Preparation method and application of a kind of low interface resistance, high mechanical strength all-solid-state battery

An interface resistance, solid-state battery technology, applied in the field of energy material preparation and electrochemistry, can solve the problems of poor ionic conductivity and mechanical strength, poor contact between the positive and negative interfaces of the battery, and difficult preparation of thin ceramic sheets. Achieve good interfacial contact, low interfacial resistance, and inhibit lithium dendrites from piercing the separator

Active Publication Date: 2019-10-01
BEIJING IAMETAL NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Inorganic ceramic electrolytes have attracted the attention of researchers due to their ultra-high conductivity and wide electrochemical window. However, the fatal problem is that the preparation process of thin ceramic sheets is too difficult and complicated, and the preparation of simple ceramic sheets Extremely brittle, the contact between the positive and negative electrodes of the battery is too poor, and the poor interface contact greatly limits the development of high-power batteries, thus greatly limiting its application in actual production
Polymer electrolytes have been widely studied because of their good flexibility, which makes the interface between the electrolyte and the electrode good. However, the contradiction between its ionic conductivity and mechanical strength makes polymers with high ionic conductivity have extremely poor mechanical properties. strength, thus limiting its further development
Therefore, it is a great challenge to prepare an all-solid-state battery with high ionic conductivity, high mechanical strength and good interfacial contact.

Method used

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  • Preparation method and application of a kind of low interface resistance, high mechanical strength all-solid-state battery
  • Preparation method and application of a kind of low interface resistance, high mechanical strength all-solid-state battery
  • Preparation method and application of a kind of low interface resistance, high mechanical strength all-solid-state battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] 1. Coating polymer film

[0046] Step 1: Take 30ml of 1-methyl-2-pyrrolidone and add 0.3g of polystyrene-butyl acrylate under full stirring to completely dissolve the polystyrene-butyl acrylate, then add 0.5% of the additive hydroxyethyl Cellulose and mass fraction are 0.05% additive polyether stearate dimethyl siloxane, then add D 1 50nm lithium titanium aluminum phosphate 2g, D 2 8g of lithium titanium aluminum phosphate with a thickness of 400nm was used to obtain a dispersion liquid of nanometer lithium titanium aluminum phosphate, and stirred for 4 hours to obtain a coating slurry;

[0047] Step 2: Preparation of polymer electrolyte membrane: 50mL N,N-dimethylformamide solution was added with 3g polymethyl methacrylate (PMMA) powder under full stirring, and after PMMA was completely dissolved and mixed evenly, the Methods PMMA thin films were prepared.

[0048] Step 3: uniformly coat the slurry on both sides of the PMMA film with a film applicator, and dry in a ...

Embodiment 2

[0060] 1. Coating polymer film

[0061] The same as in Example 1, except that the slurry was uniformly coated on one side of the PMMA film with a film applicator to prepare a ceramic-coated polymer film coated with a ceramic electrolyte on one side.

[0062] 2. Assemble all solid-state lithium metal battery

[0063] Same as Example 1. It's just that when the battery is assembled, the polymer side is in contact with the positive electrode. The performance test results of the battery are listed in Table 2.

Embodiment 3

[0070] 1. Coating composite film

[0071] Step 1: Exactly the same as in Example 1.

[0072] Step 2: Use a film applicator to evenly coat the slurry on both sides of the composite film obtained by compounding PMMA and polyethylene (PP) diaphragm, dry it in a vacuum oven at 50°C for 30min, and prepare a double-sided coated ceramic film. Electrolyte ceramic coated composite membrane.

[0073] 2. All-solid-state polymer lithium metal battery

[0074] Same as the method in Example 1. The performance test results of the battery are listed in Table 2.

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Abstract

A type of all-solid-state lithium metal battery with low interface resistance is provided. The positive side of the solid-state battery is in contact with a polymer electrolyte, and the metal lithium on the negative side is in contact with an inorganic ceramic electrolyte. Due to the instability of the contact between the polymer and metal lithium, and the poor interfacial compatibility between the positive electrode and the ceramic electrolyte, the structural design of this battery can ensure good interfacial compatibility between the electrolyte and the electrode while making the contact between the electrode and the electrolyte stable. sex. At the same time, the dense inorganic ceramic layer on the negative electrode side can effectively inhibit lithium dendrites from piercing the separator during cycling. The all-solid-state battery exhibits high specific capacity, cycle stability, and rate capability, and better mechanical strength with higher inhibition of lithium dendrites. The preparation method of the all-solid-state battery is simple, low in cost, excellent in electrochemical performance, and has broad application prospects and advantages.

Description

technical field [0001] The invention belongs to the field of energy material preparation and electrochemistry, and in particular relates to a preparation method and application of a kind of all-solid-state battery with low interface resistance and high mechanical strength. Background technique [0002] With the increasingly serious environmental pollution and the increasing scarcity of fossil fuels, it is particularly important to develop clean, cheap and safe energy storage technologies. Lithium metal batteries are known for their high theoretical energy density (3860mAh g -1 ) has received more and more attention, but lithium metal liquid batteries have electrolyte leakage, uneven deposition and dissolution of lithium metal negative electrodes to form lithium dendrites that pierce the separator, short-circuit the battery, and burn or explode due to local overheating. , thus limiting the development of lithium metal batteries. [0003] Due to the low safety and low energy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/04
CPCH01M10/04Y02P70/50
Inventor 郭玉国段惠殷雅侠万立骏
Owner BEIJING IAMETAL NEW ENERGY TECH CO LTD