Carbon-coated solid electrolyte material as well as preparation method and application thereof

A solid electrolyte and carbon-coated technology, which is applied in the field of carbon-coated solid electrolyte materials and their preparation, can solve problems such as poor conductivity, poor rate performance, and large battery polarization, and achieve less lattice defects and a degree of graphitization Effect of high performance improvement on lithium ion conductivity and electronic conductivity

Inactive Publication Date: 2020-07-10
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still some problems in the current solid-state lithium-ion batteries that need to be solved urgently, such as large battery polarization and poor rate performance; the root cause of these problems is the poor lithium-ion and electronic conductivity of the existing solid-state electrolyte, This is related to the fact that solid electrolytes are mostly non-polar materials, which have poor wettability with crystalline positive and negative electrode materials and low surface impedance.

Method used

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  • Carbon-coated solid electrolyte material as well as preparation method and application thereof
  • Carbon-coated solid electrolyte material as well as preparation method and application thereof
  • Carbon-coated solid electrolyte material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] The NASICON solid electrolyte material Li with a particle size of 1 μm 1.2 al 0.2 Ti 1.8 (PO 4 ) 3 (LATP) and sucrose were added to the mixer at a mass ratio of 10:1, and water was added to stir for 1 hour. After mixing thoroughly, it was dried at 120°C, put into the reaction equipment, and the temperature was raised to 650°C at a rate of 5°C / min; Calcined at a constant temperature for 2 hours in an argon atmosphere with a flow rate of 0.1 L / min, cooled to room temperature, and pulverized the material to obtain a carbon-coated solid electrolyte material.

[0058] figure 1 It is a scanning electron microscope (SEM) figure of the obtained carbon-coated solid electrolyte material, and its Raman spectrum figure is as follows figure 2 shown.

[0059] According to the SEM image, it can be seen that the carbon-coated solid electrolyte material is a polygonal irregular shape; according to figure 2 The Raman spectrum of the material shows that the material has obvious D...

Embodiment 2

[0062] The garnet-type solid electrolyte material Li with a particle size of 500 nm 7 Ca 3 Ta 2 o 12 (LCTO) and citric acid were added to the container at a mass ratio of 50:1, water was added and ultrasonically oscillated for 1 hour, mixed thoroughly, dried at 110°C, put into the reaction equipment, and heated to 480°C at a rate of 2°C / min; Calcined at a constant temperature for 4 hours in an argon atmosphere with a flow rate of 0.4 L / min, cooled to room temperature, and pulverized the material to obtain a carbon-coated solid electrolyte material.

[0063] The carbon-coated solid-state electrolyte material is added in the ratio of 5wt% to 90wt% positive electrode material lithium iron phosphate, and with 3wt% binder polyvinylidene fluoride (PVDF) and 2wt% conductive additive conductive carbon black ( SP) was prepared into a slurry and coated on an aluminum foil to obtain a positive electrode sheet, which was assembled into a half-cell to test the rate performance of the ma...

Embodiment 3

[0070] The LISICON type solid electrolyte material Li with a particle size of 200nm 8 Zr(PO 4 ) 4Place it in the deposition equipment, and use nitrogen as a protective gas with a flow rate of 0.2L / min; heat up to 700°C at a rate of 3°C / min; feed acetylene gas as a carbon source with a flow rate of 1L / min for vapor-phase coating deposition Cool to room temperature after 4 hours to obtain a carbon-coated solid electrolyte material. The Raman spectrum obtained by the Raman spectrum test is as follows Figure 4 shown.

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Abstract

The invention discloses a carbon-coated solid electrolyte material as well as a preparation method and application thereof. The carbon-coated solid electrolyte material comprises a solid electrolyte core and a carbon layer shell. The particle size of the solid electrolyte core is 10 nm to 100 [mu]m, and the carbon layer shell is particles with a particle size of 1nm to 1 [mu]m or a continuous filmwith a thickness of 1nm to 1 [mu]m. The particle size of the carbon-coated solid electrolyte material is 10nm to 100 [mu]m. The Raman spectrum of the carbon-coated solid electrolyte material has twocharacteristic peaks, namely a peak D and a peak G, wherein the peak D appears in the wavelength range of 1300cm<-1> to 1460cm<-1>, the peak G appears in the wavelength range of 1460cm<-1> to 1620cm<-1>, and the peak intensity ratio ID / IG of the peak D to the peak G is less than or equal to 1.0.

Description

technical field [0001] The invention relates to the technical field of battery materials, in particular to a carbon-coated solid electrolyte material and its preparation method and application. Background technique [0002] With the development of the automobile industry, hybrid electric vehicles (HEV) and electric vehicles (EV) have attracted much attention as substitutes for fuel-driven vehicles in the future, and mobile power systems are one of the key components of electric vehicles. Therefore, high-performance, low-cost and environmentally friendly batteries with high specific energy, long life and good safety will become the focus and focus of the development of the mobile power industry. Lithium-ion batteries are a new generation of green high-energy rechargeable batteries developed to meet this demand. It has outstanding advantages such as high voltage, small size, light weight, high specific energy, no memory effect, no pollution, small self-discharge, and long lif...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562H01M10/0525
CPCH01M10/0525H01M10/0562H01M2220/20H01M2300/0068Y02E60/10
Inventor 闫昭潘弘毅陈汝颂禹习谦李泓
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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