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Composite solid electrolyte material, preparation method thereof, and all-solid-state battery

A solid electrolyte and solid electrolyte layer technology, applied in the field of lithium-ion batteries, can solve the problems of low room temperature ionic conductivity, poor electrochemical stability, narrow electrochemical window, etc., to achieve enhanced electrochemical stability, improved capacity fading, The effect of interfacial contact stabilization

Inactive Publication Date: 2018-12-07
ZHUHAI SMOOTHWAY ELECTRONICS MATERIALS +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Polyethylene oxide (PEO) is the earliest and most studied polymer electrolyte material, but the room temperature ionic conductivity of PEO-based polymer electrolytes is low (10 -7 S / cm~10 -6 S / cm), and poor electrochemical stability, narrow electrochemical window (~4.5V), which limit the application of pure PEO polymer electrolyte

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  • Composite solid electrolyte material, preparation method thereof, and all-solid-state battery
  • Composite solid electrolyte material, preparation method thereof, and all-solid-state battery
  • Composite solid electrolyte material, preparation method thereof, and all-solid-state battery

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[0031] The invention relates to an organic / inorganic composite solid electrolyte material and a preparation method thereof. This method takes the viscosity average molecular weight Mv as 5×10 3 ~9×10 6 The polyethylene oxide (PEO) is the matrix of the solid electrolyte, and the molar ratio of the oxygen atom in the polyethylene oxide to the Li in the lithium salt is between 8:1 and 30:1; an inorganic electrolyte with high lithium ion conductivity is selected Li7La3Zr2O12(LLZO), Li 10 GeP 2 S 12 (LGPS) and Li 2 O-Al 2 O 3 -TiO 2 -P 2 O 5 (LATP) as an inorganic filler material, select malononitrile, succinonitrile, adiponitrile, N-methyl-N-ethylbis(trifluoromethylsulfonyl)imide tetrahydropyrrole (PY 12 TFSI) and nitrile group-containing quaternary ammonium salt and other plastic crystal compound materials or multiple in any ratio as solid plasticizing materials, select lithium hexafluorophosphate, lithium tetrafluoroborate, lithium hexafluoroarsenate, lithium perchlorate, One or m...

Embodiment 1

[0034] The ready-to-use polyethylene oxide, inorganic powder, plastic crystal compound and lithium salt are dried; weigh 0.2753g PEO (viscosity average molecular weight Mv is 5 million) and 0.0997g LiTFSI, dissolve them in 15ml acetonitrile solution, in 60 Magnetic stirring at 500r / min for 12h at ℃ to obtain homogeneous and transparent solution A. Weigh out 0.0857g Li 7 La 3 Zr 2 O 12 (LLZO) powder and 0.0429 g of succinonitrile (SN) were added to solution A, and magnetically stirred at a rotation speed of 500 r / min at 60° C. for 12 hours to obtain a white suspension B. The suspension B obtained above is poured into a mold for forming by a casting method. Place the mold in a dry and dust-free environment for 12 hours at room temperature, and then put it in a vacuum drying box for vacuum drying at 45° C. for 24 hours to obtain the desired composite solid electrolyte material. The prepared electrolyte material is processed into the required shape, superimposed with the positive ...

Embodiment 2

[0036] The polyoxyethylene, inorganic powder, plastic crystal compound and lithium salt to be used are dried; weigh 0.2753g PEO (viscosity average molecular weight Mv is 1.2 million) and 0.0997g LiTFSI, dissolve them in 15ml acetonitrile solution, and weigh them at 60 Magnetic stirring at 500r / min for 12h at ℃ to obtain homogeneous and transparent solution A. Weigh 0.7g Li 10 GeP 2 S 12 (LGPS) powder and 0.0331g of succinonitrile (SN) were added to solution A, and magnetically stirred at a speed of 500r / min at 60°C for 12h to obtain a white suspension B. The suspension B obtained above is poured into a mold for forming by a casting method. Place the mold in a dry and dust-free environment for 12 hours at room temperature, and then put it in a vacuum drying box for vacuum drying at 45° C. for 24 hours to obtain the desired composite solid electrolyte material. The prepared electrolyte material is processed into the required shape, superimposed with the positive electrode active...

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Abstract

The invention discloses a composite solid electrolyte material, a preparation method thereof, and an all-solid-state battery. The all-solid-state battery includes a positive electrode layer, a negative electrode layer, and the composite solid electrolyte material positioned between the positive electrode layer and the negative electrode layer. The composite solid electrolyte material includes polyoxyethylene, an inorganic powder having a high ionic conductivity, a plastic crystal compound and a lithium salt. The preparation method comprises the following steps: weighing the polyoxyethylene andthe lithium salt in proportion, adding the weighed substances to an organic solution, and performing stirring to obtain a solution A; weighing the inorganic powder and the plastic crystal compound inproportion, adding the weighed substances to the solution A, and performing stirring to obtain a uniformly mixed suspension B; and pouring the suspension B into a mold, and drying the suspension B inthe mold to obtain the organic / inorganic composite solid electrolyte material. The composite solid electrolyte material has an obviously improved room-temperature ionic conductivity and an enhanced electrochemical stability, and has a stable interface contact with a positive electrode and a negative electrode, and the capacity attenuation problem of the all-solid-state battery formed by assembling the composite solid electrolyte material is significantly improved.

Description

[Technical Field] [0001] The invention relates to a lithium ion battery, in particular to a composite solid electrolyte material and a preparation method and an all-solid battery. [Background technique] [0002] Lithium-ion batteries have been attracting attention since they were put on the market in 1991, quickly occupying the market leading position of secondary batteries, and have become an indispensable part of the energy economy in the 21st century. Electrolyte is an indispensable component of lithium-ion batteries, and its performance greatly affects various performance indicators of the battery. Therefore, the discovery of electrolyte materials with excellent electrochemical performance will have important era significance. Compared with traditional liquid lithium-ion batteries, solid-state batteries use solid electrolyte materials instead of traditional electrolytes, which reduces the use of electrolytes, separators and binders, which not only simplifies the battery struc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/0525
CPCH01M10/0525H01M10/0565H01M2300/0082Y02E60/10
Inventor 陈斐查文平阳敦杰李君阳戴晓兵沈强张联盟
Owner ZHUHAI SMOOTHWAY ELECTRONICS MATERIALS
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