High-voltage all-solid-state lithium battery electrolyte and preparation method therefor

An all-solid-state, electrolyte technology, applied in the direction of solid electrolyte, electrolyte battery manufacturing, non-aqueous electrolyte, etc., can solve the problems of limiting the energy density of the battery system, difficult NCM material pairing, PEO oxidation, etc., to achieve good cycle stability and low cost , the effect of simple preparation method

Active Publication Date: 2019-03-29
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition to low conductivity, PEO tends to oxidize when charged above 4 V, making it difficult to pair with NCM materials and limiting the energy density of this battery system

Method used

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  • High-voltage all-solid-state lithium battery electrolyte and preparation method therefor

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Experimental program
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Effect test

Embodiment 1

[0047] 1. The present invention discloses an electrolyte for an all-solid-state lithium-ion battery, which consists of 0.345g LiTFSI, 1gPVDF (Mn=300000) and 0.1g SiO 2 composition.

[0048] 2. A preparation method for an all-solid-state lithium-ion battery electrolyte: 0.345g LiTFSI, 1g PVDF (Mn=300000) and 0.1g SiO 2 Put it into a vacuum oven to heat at 70°C after fully grinding, then take out the powder and put it in a hot press, and press it at 70°C with a pressure of 10MPa to obtain a uniform composite polymer electrolyte.

[0049] 3. An all-solid-state lithium-ion battery, comprising a positive electrode, a negative electrode, and the electrolyte prepared in this embodiment; the positive electrode includes: LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 , acetylene black, PVDF and aluminum foil, of which LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 The mass ratio of acetylene black and PVDF is 8:1:1; the negative pole is metal lithium foil.

Embodiment 2

[0051] 1. The present invention discloses an electrolyte for an all-solid-state lithium-ion battery, which consists of 0.345g LiTFSI, 1gPVDF (Mn=300000) and 0.1g Al 2 o 3 composition.

[0052] 2. A preparation method for an all-solid-state lithium-ion battery electrolyte: 0.345g LiTFSI, 1g PVDF (Mn=300000) and 0.1g SiO 2 Put it into a vacuum oven to heat at 70°C after fully grinding, then take out the powder and put it in a hot press, and press it at 70°C with a pressure of 10MPa to obtain a uniform composite polymer electrolyte.

[0053] 3. An all-solid-state lithium-ion battery, comprising a positive electrode, a negative electrode, and the electrolyte prepared in this embodiment; the positive electrode includes: LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 , acetylene black, PVDF and aluminum foil, of which LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 The mass ratio of acetylene black and PVDF is 8:1:1; the negative pole is metal lithium foil.

[0054] 4. Cycle test at 50°C: battery test condition i...

Embodiment 3

[0056] 1. The present invention discloses an electrolyte for an all-solid-state lithium-ion battery, which consists of 0.345g LiTFSI, 1gPVDF (Mn=300000) and 0.1g TiO 2 composition.

[0057] 2. A preparation method for an all-solid-state lithium-ion battery electrolyte: 0.345g LiTFSI, 1g PVDF (Mn=300000) and 0.1g SiO 2 Put it into a vacuum oven to heat at 70°C after fully grinding, then take out the powder and put it in a hot press, and press it at 70°C with a pressure of 10MPa to obtain a uniform composite polymer electrolyte.

[0058] 3. An all-solid-state lithium-ion battery, comprising a positive electrode, a negative electrode, and the electrolyte prepared in this embodiment; the positive electrode includes: LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 , acetylene black, PVDF and aluminum foil, of which LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 The mass ratio of acetylene black and PVDF is 8:1:1; the negative pole is metal lithium foil.

[0059] 4. Cycle test at 50°C: battery test condition is 15...

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Abstract

The invention relates to a high-voltage all-solid-state lithium battery electrolyte and a preparation method therefor, and belongs to the field of solid-state electrolyte preparation. The electrolytecomprises 50%-85% of a lithium ion-conducting polymer, 15%-50% of lithium salt, and 0%-50% of a nano inorganic particle filler. The nanofiller contains one or two of SiO2, TiO2 and Al2O3. The lithiumion-conducting polymer is polyvinylidene fluoride (PVDF). The solid electrolyte prepared by the method adopts the PVDF with high voltage resistance and high ionic conductivity as an ion transport phase, and the prepared solid electrolyte has the advantages of good compatibility with the positive electrode, high voltage resistance and environmental friendliness.

Description

technical field [0001] The invention belongs to the field of lithium batteries, and in particular relates to a high-voltage polymer all-solid-state lithium battery electrolyte, a preparation method thereof, and an all-solid-state battery containing the electrolyte. Background technique [0002] Over the past few decades, the application of traditional liquid electrolytes has been extended to smart mobile devices, power tools, and electric vehicles. However, current rechargeable Li-ion batteries may face serious safety risks due to the inherent instability of liquid electrolytes. Especially with the growing demand for advanced lithium metal batteries, safety issues are becoming more prominent and compelling. Solid electrolytes can greatly improve the safety of lithium batteries, and solid electrolytes generally have good thermal stability, electrochemical stability, and mechanical processing performance. [0003] Although the solid-state electrolyte membrane used in the cur...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/058H01M10/0525B82Y30/00
CPCB82Y30/00H01M10/0525H01M10/0565H01M10/058H01M2300/0082Y02E60/10Y02P70/50
Inventor 冯金奎费慧芳
Owner SHANDONG UNIV
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