Organic/inorganic composite solid electrolyte with gradient interface structure, and all-solid-state lithium battery

A solid electrolyte, solid electrolyte layer technology, applied in solid electrolyte, non-aqueous electrolyte battery, lithium battery and other directions, can solve the problems of low lithium ion conduction performance and poor contact of the positive electrode, and achieve easy promotion, improved contact, and reduced interface impedance. Effect

Pending Publication Date: 2020-12-29
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But at the same time, it also has some problems, such as the poor interface contact between the electrolyte and the positive electrode, and the low performance of the positive electrode for conducting lithium ions.

Method used

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  • Organic/inorganic composite solid electrolyte with gradient interface structure, and all-solid-state lithium battery
  • Organic/inorganic composite solid electrolyte with gradient interface structure, and all-solid-state lithium battery
  • Organic/inorganic composite solid electrolyte with gradient interface structure, and all-solid-state lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] An all-solid-state lithium battery, the preparation method of which is as follows:

[0051] a. By the sol-gel method, under the condition of lithium excess of 16% (molar ratio), LLZO with high ion conductivity was synthesized through steps such as debinding and sintering (Li 7 La 3 Zr 2 o 12 ) powder, and sieved; the LCO powder was ball milled and refined, using isopropanol as a solvent, and ball milled at a speed of 300r / min for 12h;

[0052] b. Weigh 5 parts of polyethylene oxide (PEO), add 5 parts of acetonitrile to stir each part, the content of polyethylene oxide (PEO) in each part is 0.1g, acetonitrile 7mL, stir and heat at 60°C for 1.5h, the speed is maintained At 300r / min, polyethylene oxide (PEO) is fully dissolved in acetonitrile to form 5 parts of colloidal solutions S1, S2, ..., S5, wherein the S5 solution is used as the electrolyte layer, and the first four parts are used to prepare the gradient structure layer ( At the same time as the positive electro...

Embodiment 2

[0060] An all-solid-state lithium battery, the preparation method of which is as follows:

[0061] a. Through the traditional solid-state method, lithium excess 10% (molar ratio), through ball milling, pre-calcination, tablet sintering and other steps, synthesize LLZO with high ion conductivity (Li 7 La 3 Zr 2 o 12 ) powder for sieving treatment; using isopropanol as solvent, wet planetary ball milling at a speed of 300r / min for 12h to refine LCO (LiCoO 2 ) powder, and prepare conductive carbon, polyethylene oxide (PEO);

[0062] b. Weigh 4 parts of polyethylene oxide (PEO) and add them into 4 parts of acetonitrile and stir, the rotation speed is maintained at 300r / min, the content of polyethylene oxide (PEO) in each part is 0.1g, acetonitrile 6.5mL, stir at 60°C Heating for 1.5h to fully dissolve polyethylene oxide (PEO) in acetonitrile to form colloidal solutions S1, S2, S3, and S4 for preparing positive electrodes;

[0063] c. Keep stirring S1 to S4 at room temperature...

Embodiment 3

[0071] An all-solid-state lithium battery, the preparation method of which is as follows:

[0072] a. By plasma activation sintering, lithium excess 10% (molar ratio), synthesis of Li 5 La 3 Nb 2 o 12 The powder is sieved; using isopropanol as a solvent, wet planetary ball milling at a speed of 150r / min for 12 hours, refines the lithium iron phosphate powder, and prepares conductive carbon and polyethylene oxide (PEO);

[0073] b. Weigh 2 parts of polyethylene oxide (PEO) and add them into 2 parts of acetonitrile and stir, the rotation speed is maintained at 300r / min, the content of polyethylene oxide (PEO) in each part is 0.1g, acetonitrile 6.5mL, stir and heat at 60°C 1.5h, fully dissolve polyethylene oxide (PEO) in acetonitrile to form colloidal solutions S1 and S2, which are used as positive electrodes;

[0074] c. Keep stirring S1 and S2 at room temperature, while adding 0.1g of conductive carbon;

[0075] d. Proportionate Li according to the component gradient ratio...

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Abstract

The invention relates to an organic / inorganic composite solid electrolyte with a gradient interface structure, and an all-solid-state lithium battery. The composite solid electrolyte is composed of anorganic / inorganic composite solid electrolyte layer and a gradient structure layer compounded on the surface of the organic / inorganic composite solid electrolyte layer, wherein the gradient structurelayer of the solid electrolyte is in contact with a battery positive electrode or serves as a positive electrode, the gradient structure layer contains a positive electrode active substance and a conductive ion electrolyte, the conductive ion electrolyte is a mixture of a conductive ion inorganic substance and a conductive ion organic substance, and in the direction of the organic / inorganic composite solid electrolyte layer, the concentration of the positive electrode active substance is gradually reduced, and the concentration of the conductive ion inorganic substance is gradually increased.According to the invention, the gradient structure layer is arranged on the solid electrolyte interface of the all-solid-state battery and is matched with different chemical and electrochemical environments of the electrolyte end and the positive electrode end, so that the interface contact between the positive electrode and the electrolyte is greatly improved, the electrolyte / positive electrodeinterface impedance is reduced, and the charge-discharge performance of the all-solid-state battery is improved.

Description

technical field [0001] The technology belongs to the field of all-solid-state batteries, and relates to an organic / inorganic composite solid electrolyte with a gradient interface structure and an all-solid-state lithium battery. [0002] technical background [0003] The traditional lithium-ion battery is a secondary battery, that is, a rechargeable battery. In 1912, the lithium metal battery was first proposed and studied by Gilbert N. Lewis. Today, lithium-ion batteries are used in a wide range of applications, including mobile phones, notebook computers, electric vehicles, portable electronic devices or vehicles, and many other fields. [0004] Compared with other types of batteries, traditional lithium-ion batteries are light in weight, have higher output voltage and energy density, low self-discharge, long cycle life, and wide operating temperature range, but there are also many disadvantages, such as easy leakage, easy Corrosion, etc., lead to poor safety and low relia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/056H01M10/052
CPCH01M10/056H01M10/052H01M2300/0065Y02E60/10
Inventor 陈斐宋尚斌曹诗雨沈强张联盟
Owner WUHAN UNIV OF TECH
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