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Design criteria and process for producing lithium ion abio-composite solid electrolyte material

A solid electrolyte and inorganic composite technology, applied in batteries with solid electrolytes, non-aqueous electrolyte batteries, chemical instruments and methods, etc., can solve the problems of difficult preparation, wide electrochemical window, and high ionic conductivity

Inactive Publication Date: 2008-01-30
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most sulfide lithium-ion solid electrolytes are easy to hydrolyze, difficult to prepare, and contain toxic and harmful chemicals (such as P 2 S 5 Wait)
[0004] Although lithium-ion solid electrolytes have achieved significant development, there are still few lithium-ion solid-state electrolyte systems with high ionic conductivity, low electronic conductivity, wide electrochemical window, stability to metallic lithium, strong deliquescence resistance, and environmental friendliness. No

Method used

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  • Design criteria and process for producing lithium ion abio-composite solid electrolyte material
  • Design criteria and process for producing lithium ion abio-composite solid electrolyte material
  • Design criteria and process for producing lithium ion abio-composite solid electrolyte material

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Embodiment 1

[0037] 1. The choice of composite electrolyte material system

[0038] According to the above-mentioned design guidelines for lithium-ion inorganic composite electrolyte materials, the main component of the electrolyte can be a variety of materials with high lithium ion conductivity, regardless of the electronic conductivity, electrochemical stability and other properties of the selected material. The present invention selects Li which is widely studied and has high ionic conductivity but narrow electrochemical window. 3x La (2 / 3)-x □ (1 / 3)-2x TiO 3 (LLTO) as the main component of the target composite electrolyte, where 0≤x≤1; at the same time, it has high ionic conductivity, low electronic conductivity, wide electrochemical window, but easy to hydrolyze Li 3.25 Ge 0.25 P 0.75 S 4 As the cladding layer of LLTO.

[0039] 2. Preparation process of composite electrolyte

[0040] The preparation of the main component LLTO of the composite electrolyte material adopts the traditional so...

Embodiment 2

[0057] 1. The choice of composite electrolyte material system

[0058] According to the above-mentioned design guidelines for lithium-ion inorganic composite electrolyte materials, the main component of the electrolyte can be a variety of materials with high lithium ion conductivity, regardless of the electronic conductivity, electrochemical stability and other properties of the selected material. The present invention selects Li which is widely studied and has high ionic conductivity but narrow electrochemical window. 1+x Ti 2-x M x (PO 4 ) 3 (M=Al, Ga, In or Sc) (LMTPO) as the main component of the target composite electrolyte, where 03.25 Ge 0.25 P 0.75 S 4 As the cladding layer of LMTPO.

[0059] 2. Preparation process of composite electrolyte

[0060] The preparation of LMTPO, the main component of the composite electrolyte material, adopts the traditional solid-phase reaction method, which combines the stoichiometric ratio of Li 2 CO 3 , M 2 O 3 (M=Al, Ga, In or Sc), TiO 2 A...

Embodiment 3

[0066] 1. The choice of composite electrolyte material system

[0067]According to the design criteria of the above-mentioned lithium ion inorganic composite electrolyte material, the main component of the electrolyte can be a variety of materials with high lithium ion conductivity, regardless of the electronic conductivity, electrochemical stability and other properties of the selected material. The present invention selects LiTiS which is widely studied and has high ionic conductivity, high electronic conductivity, and narrow electrochemical window. 2 As the main component of the target composite electrolyte; at the same time, it has high ionic conductivity, low electronic conductivity, wide electrochemical window, but easy to hydrolyze Li 3.25 Ge 0.25 P 0.75 S 4 As LiTiS 2 的cladding.

[0068] 2. Preparation process of composite electrolyte

[0069] Composite electrolyte material main component LiTiS 2 The preparation adopts the traditional solid-phase reaction method, the stoic...

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Abstract

The invention relates to a design criterion and a preparation method for the inorganic composite solid electrolytic materials of a lithium ion. The invention is characterized in that the construction of a lithium ion inorganic composite solid electrolyte comprises two components: (1) different lithium ion high electrical conductivity materials make up the principle components of a target composite solid electrolyte, and no consideration needs to be made as to the electronic conductivity and chemical stability when making choices, so the concerned principle components of the lithium ion inorganic composite solid electrolyte has a wide selection range; (2) the inhibitory coating on the principle components of the target composite solid electrolyte is made up of materials with low electronic conductivity, wide electrochemical window and high lithium ion conductivity. The principle components and the inhibitory coating can both be prepared through different methods of a solid state reaction, a coprecipitation, a hydrotherm or a sol-gel, etc., the coating technology is a ball mill mixing coating, a coprecipitation coating, or a sol-gel coating. The constructed solid electrolytic materials have a lithium ion conductivity which is more than or equal to10-4S cm-1, an electronic conductivity which is less than or equal to 10-7 S cm-1 and an electrochemical window which is more than or equal to 4.5V.

Description

Technical field [0001] The invention relates to a design criterion and a preparation method of a lithium ion inorganic composite solid electrolyte material that can be used in a lithium battery (mainly a lithium secondary battery), including a construction and preparation method of a lithium ion inorganic composite solid electrolyte, and belongs to the field of lithium battery materials. Background technique [0002] Lithium-ion secondary batteries have large specific capacity, high specific power, and long service life. They are expected to replace all kinds of power using fossil energy and become a new generation of pollution-free, zero-emission green power. Therefore, it has become a hot spot for research and development in various countries. Traditional lithium-ion batteries use organic liquid electrolytes, and serious fires and electrolyte leakage accidents caused by organic liquid electrolytes occur from time to time, which is difficult to meet the high safety of high-power...

Claims

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Application Information

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IPC IPC(8): H01M6/18H01M10/02H01M10/36H01B1/06B01J19/00H01M10/0562
CPCY02E60/12Y02E60/10
Inventor 黄富强王耀明杨建华
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI