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All solid state lithium battery cathode interface modification method

An interface modification, lithium battery technology, applied in battery electrodes, negative electrodes, electrode manufacturing, etc., can solve problems such as generation of interface phases and poor wettability, and achieve the effect of buffering stress changes and reducing costs

Active Publication Date: 2019-11-12
湖南恩捷前沿新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention mainly provides a method for modifying the negative electrode interface of an all-solid-state lithium battery, which mainly solves the problems of interface phase generation and poor wettability between the lithium negative electrode and the solid electrolyte in the existing solid-state battery

Method used

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  • All solid state lithium battery cathode interface modification method

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Effect test

Embodiment 1

[0018] Using LiFeO 4 As the positive electrode material coated into a pole sheet, Li 1.3 al 0.3 Ti 1.7 (PO 4 ) 3 As the electrolyte sheet, metal lithium is used as the negative electrode. Weigh 1-butyl-2,3-dimethylimidazolium tetrafluoroborate, lithium salt and lithium nitrate according to 89.9:10:0.1, heat and stir at 50°C for 12 hours, apply the product dropwise on the electrolyte sheet, and statically After standing and solidifying, a modified layer with a thickness of 2 μm was obtained. According to the order of positive electrode-electrolyte-modified layer-negative electrode, it was assembled into a button battery for testing. Please refer to figure 1 , tested at 25°C, after 100 cycles of constant current discharge at 0.5C, it can still maintain 115mAh / g, showing good cycle stability.

Embodiment 2

[0020] Using LiCo 0.8 Ni 0.1 al 0.1 o 2 As the positive electrode material coated into pole piece, NASICON type Li 1.4 al 0.4 Ti 1.6 (PO 4 ) 3 As the electrolyte sheet, metal lithium is used as the negative electrode. Weigh 1-butyl-2,3-dimethylimidazolium tetrafluoroborate, lithium salt and lithium nitrate according to 79.9:20:3, heat and stir at 60°C for 24 hours, apply the product dropwise on the electrolyte sheet, and statically After standing and solidifying, a modified layer with a thickness of 20 μm was obtained. According to the order of positive electrode-electrolyte-modified layer-negative electrode, it was assembled into a button battery for testing. Tested at 25°C, after 100 cycles of constant current discharge at 0.5C, it can still maintain 123mAh / g, showing good cycle stability.

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Abstract

The invention discloses an all solid state lithium battery cathode interface modification method. An interface modification layer is 10 nm to 50 [mu]m in thickness and composed of 1-butyl-2, 3-dimethylimidazole tetrafluoro borate, lithium salt, and additives in a certain ratio. The modification layer is prepared via the following steps: a step of weighing the 1-butyl-2, 3-dimethylimidazole tetrafluoro borate, the lithium salt and the additives in a mass ratio of (69.9-90):(5-30):(0.1-5) and heating and stirring the same evenly; a step of coating a solid electrolyte layer and / or a cathode withan obtained solution and obtaining the modification layer after standing and solidifying operation. In the present invention, the 1-butyl 2, 3 dimethylimidazole tetrafluoro borate is high in ionic conductivity and wide in electrochemical window. Heating and melting the lithium salt and the additives can help further improve electrochemical performance thereof. Using the product as an interface layer can help prevent direct contact between a lithium cathode and a solid electrolyte so as to improve electrochemical performance of a solid battery.

Description

technical field [0001] The invention relates to the field of all-solid lithium batteries, in particular to a method for modifying the negative electrode interface of an all-solid lithium battery. Background technique [0002] Lithium-ion batteries are widely used in the field of energy storage due to their advantages of high energy density and high power density, and now lithium-ion batteries have become one of the strong candidates for electric vehicles. However, the consumer market has further requirements for the energy density and safety of lithium-ion batteries, especially the recent spontaneous combustion incident in Tesla vehicles, which has increased attention to battery safety. The use of solid electrolytes instead of electrolytes can effectively avoid accidents such as leakage and flammability caused by electrolytes. Since the solid-state electrolyte has a wider electrochemical window than the electrolyte, the solid-state battery can use a high-voltage intercalati...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/1395H01M4/62H01M4/38H01M10/0525
CPCH01M4/0407H01M4/0416H01M4/0419H01M4/1395H01M4/382H01M4/624H01M4/628H01M10/0525H01M2004/027H01M2300/0085H01M2300/0094Y02E60/10
Inventor 刘芳洋赖延清徐向群汪齐蒋良兴贾明李劼
Owner 湖南恩捷前沿新材料科技有限公司
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