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High-safety composite solid electrolyte and preparation method thereof

A solid electrolyte, high safety technology, applied in solid electrolyte, electrolyte, non-aqueous electrolyte, etc., can solve the problems of high viscosity, low lithium salt solubility affecting the ionic conductivity of liquid electrolyte, etc., to avoid burning or even explosion, avoid Side reaction, effect of improving ion conductivity

Inactive Publication Date: 2021-01-29
西安越遴新材料研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In the prior art, phosphoric acid esters such as trimethyl phosphate (TMP), tributyl phosphate (TBP), and trifluoroethyl phosphate (TFFP) are used as liquid electrolyte additives to reduce the flammability of carbonate electrolyte, but Its high viscosity, low lithium salt solubility and other issues affect the ionic conductivity of the liquid electrolyte

Method used

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  • High-safety composite solid electrolyte and preparation method thereof

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Embodiment 1

[0046] This embodiment provides a high-safety composite solid electrolyte, which is composed of a polymer, a lithium salt, a flame retardant, an inorganic solid electrolyte and an organic solvent; wherein, the inorganic solid electrolyte is nanoscale garnet-type lithium lanthanum zirconium tantalum oxide ( LLZTO), its preparation method is as follows:

[0047] Lithium hydroxide, lanthanum oxide, zirconia, tantalum oxide according to Li 6.5 La 3 Zr 1.5 Ta 0.5 o 12 The ratio of the composition was weighed, mixed evenly, placed in a box furnace, and the calcination temperature was raised from room temperature (25°C) to 1150°C at a rate of 3°C / min for 12 hours to obtain garnet-type LLZTO; the obtained pomegranate Stone-type LLZTO is placed in a planetary ball mill and milled at a speed of 480r / min for 16 hours to obtain nano-sized garnet-type LLZTO; wherein, the ball milling medium is absolute ethanol, the dispersant is polyethylene glycol, and the balls and materials of the p...

Embodiment 2

[0060] This embodiment provides a high-safety composite solid electrolyte, which is composed of a polymer, a lithium salt, a flame retardant, an inorganic solid electrolyte and an organic solvent; wherein, the inorganic solid electrolyte is nanoscale garnet-type lithium lanthanum zirconium tantalum oxide ( LLZTO), its preparation method is as follows:

[0061] Lithium hydroxide, lanthanum oxide, zirconia, tantalum oxide according to Li 6.5 La 3 Zr 1.5 Ta 0.5 o 12 The ratio of the composition was weighed, mixed evenly, placed in a box furnace, and the calcination temperature was raised from room temperature (25°C) to 1100°C at a rate of 5°C / min and calcined for 12 hours to obtain garnet-type LLZTO; the obtained pomegranate The stone-type LLZTO is placed in a planetary ball mill and milled at a speed of 500r / min for 12 hours to obtain nano-sized garnet-type LLZTO, and the particle size of nano-sized garnet-type lithium lanthanum zirconium tantalum oxide is 100-400nm; wherein...

Embodiment 3

[0072] This embodiment provides a high-safety composite solid electrolyte, which is composed of a polymer, a lithium salt, a flame retardant, an inorganic solid electrolyte and an organic solvent; wherein, the inorganic solid electrolyte is nanoscale garnet-type lithium lanthanum zirconium tantalum oxide ( LLZTO), its preparation method is as follows:

[0073] Lithium hydroxide, lanthanum oxide, zirconia, tantalum oxide according to Li 6.5 La 3 Zr 1.5 Ta 0.5 o 12 The ratio of the composition was weighed, mixed evenly, placed in a box furnace, and the calcination temperature was raised from room temperature (25°C) to 1200°C at a rate of 2°C / min to calcinate for 10 hours to obtain garnet-type LLZTO; the obtained pomegranate The stone-type LLZTO is placed in a planetary ball mill and milled at a speed of 480r / min for 16 hours to obtain nano-sized garnet-type LLZTO. Water ethanol, the dispersant is polyethylene glycol, and the mass ratio of the ball, the material and the medi...

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Abstract

The invention belongs to the technical field of batteries, and relates to a composite solid electrolyte and a preparation method thereof. The electrolyte comprises a polymer, a lithium salt, a flame retardant and an inorganic solid electrolyte, the mass ratio of the lithium salt to the polymer is (0.4-0.8): 1, the mass ratio of the flame retardant to the polymer is (0.2-0.5): 1, and the mass ratioof the inorganic solid electrolyte to the polymer is (5-50): 100. The electrolyte adopts an organic-inorganic composite structure, so that side reaction can be effectively avoided, the ionic conductivity of lithium ions is improved, the conductivity of the lithium ions at room temperature can reach 10<-4> Scm<1>, and an electrochemical stability window is about 5V. Besides, by adding the flame retardant, the electrolyte has the characteristic of non-combustibility, and the potential safety hazard of combustion and even explosion caused by preheating of the liquid electrolyte in the traditional lithium ion battery is avoided.

Description

technical field [0001] The invention belongs to the technical field of batteries, relates to lithium-ion secondary batteries, and in particular to a high-safety composite solid electrolyte and a preparation method thereof. Background technique [0002] Traditional liquid lithium-ion batteries, as a major class of electrochemical energy storage devices, play a vital role in today's society. It is not only the main power source of many consumer electronics products, but also the most prominent energy storage technology in the field of electric vehicles. Because traditional liquid lithium-ion batteries use liquid electrolytes, they generally have safety problems such as volatile, flammable, and explosive, which severely limit the development of lithium-ion batteries. Therefore, the use of solid electrolytes to replace liquid organic electrolytes to solve the safety problems of traditional liquid electrolyte lithium-ion batteries has become a breakthrough point for next-generat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562H01M10/0565H01M10/42H01M10/0525
CPCH01M10/0562H01M10/0565H01M10/4235H01M10/0525H01M2300/0071H01M2300/0082Y02E60/10
Inventor 马越齐玉双
Owner 西安越遴新材料研究院有限公司
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