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Salt-doped polymer composite solid-state electrolyte and preparation method thereof, and lithium battery

A solid electrolyte and polymer technology, applied in solid electrolytes, non-aqueous electrolytes, secondary batteries, etc., can solve the problems of low lithium ion conductivity at room temperature, limited use, short battery cycle life, etc., and achieve excellent cycle performance, The effect of improving conductivity

Pending Publication Date: 2019-11-26
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology provides an improved solution for making better batteries than existing materials due to its use of specific types of material called ceramics instead of traditional metals like iron oxide powder. These specialized particles help improve the charge transfer process within the cell while also improving their overall effectiveness during charging and discharges operations. Overall this results in longer lifetimes and more efficient energy storage capabilities compared to current methods such as metal hydride cells.

Problems solved by technology

This patented technical solution described for improving the performance and lifespan of Li-ion cells involves developing new materials with better electrical properties than current liquid or gelled solids while reducing environmental concerns associated therewith.

Method used

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  • Salt-doped polymer composite solid-state electrolyte and preparation method thereof, and lithium battery
  • Salt-doped polymer composite solid-state electrolyte and preparation method thereof, and lithium battery
  • Salt-doped polymer composite solid-state electrolyte and preparation method thereof, and lithium battery

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Embodiment 1

[0035] A salt-doped polymer composite solid electrolyte, comprising the following components: LLZTO nanowires, PEO and LiTFSI; wherein, the molar ratio of the PEO monomer to lithium ions in LiTFSI is 6:1; the LLZTO nanowires and PEO The total mass ratio is 1:10.

[0036] Among them, the preparation method of LLZTO nanowires is lithium nitrate, lanthanum nitrate hexahydrate, zirconium n-propoxide, tantalum ethoxide according to Li 6.75 La 3 Zr 1.75 Ta 0.25 o 12 The proportion of the composition is weighed, and dissolved in a mixed solvent of N,N-dimethylformamide (DMF) analytical grade and glacial acetic acid with a volume ratio of 5:1, after dissolving, add an appropriate amount of polyvinylpyrrolidone (PVP) and stir to dissolve A spinning precursor solution was obtained, wherein the mass ratio of PVP to DMF was 10%. Place it in a syringe for electrospinning, wherein the spinning voltage is 16KV, the distance between the needle and the receiver is about 15cm, and the obta...

Embodiment 2

[0039] A salt-doped polymer composite solid electrolyte, comprising the following components: LLZAO nanowires, PEO and LiTFSI; wherein, the molar ratio of the PEO monomer to lithium ions in LiTFSI is 6:1; the LLZAO nanowires and PEO The total mass ratio is 1:10.

[0040] Among them, the preparation method of LLZAO nanowires is lithium nitrate, lanthanum nitrate hexahydrate, zirconium n-propoxide, aluminum nitrate nonahydrate according to Li 6.25 La 3 Zr 2 Al 0.25 o 12 The proportion of the composition is weighed, and dissolved in a mixed solvent of N,N-dimethylformamide (DMF) analytical grade and glacial acetic acid with a volume ratio of 5:1, after dissolving, add an appropriate amount of polyvinylpyrrolidone (PVP) and stir to dissolve A spinning precursor solution was obtained, wherein the mass ratio of PVP to DMF was 10%. Place it in a syringe for electrospinning, wherein the spinning voltage is 16KV, the distance between the needle and the receiver is about 15cm, and ...

Embodiment 3

[0043] A salt-doped polymer composite solid electrolyte, comprising the following components: LLZO nanowires, PEO and LiTFSI; wherein, the molar ratio of the PEO monomer to lithium ions in LiTFSI is 6:1; the LLZO nanowires and PEO The total mass ratio is 1:10.

[0044] Among them, the preparation method of LLZO nanowires is lithium nitrate, lanthanum nitrate hexahydrate, and zirconium n-propoxide according to Li 7 La 3 Zr 2 o 12 The proportion of the composition is weighed, and dissolved in a mixed solvent of N,N-dimethylformamide (DMF) analytical grade and glacial acetic acid with a volume ratio of 5:1, after dissolving, add an appropriate amount of polyvinylpyrrolidone (PVP) and stir to dissolve A spinning precursor solution was obtained, wherein the mass ratio of PVP to DMF was 10%. Place it in a syringe for electrospinning, wherein the spinning voltage is 16KV, the distance between the needle and the receiver is about 15cm, and the obtained fibers are collected on alum...

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Abstract

The invention is suitable for the field of the lithium ion battery material, and provides a salt-doped polymer composite solid-state electrolyte and a preparation method thereof, and a lithium battery. The salt-doped polymer composite solid-state electrolyte comprises a ceramic nano-wire, a polymer matrix and lithium salt; the proportion of the polymer and the lithium salt in the polymer matrix is(4-11): 1; the total mass ratio of the ceramic nanowire and the polymer is (1-15): 100. A new ion transmission path is provided by compounding the polymer matrix of the high-lithium salt concentration (salt-doped polymer type) system with the ceramic nanowire in the polymer matrix, and the lithium dendrites growth is suppressed by promoting the uniform transmission of the lithium ion, the conductivity is improved, and can reach 2.13*10-4S.cm-1 at the room temperature (25 DEG C), the battery circulation can be performed on 0.2C at the room temperature, the discharging capacity is 102mAh/g after circulating for 100 circles, and the capacity retention ratio is 84%.

Description

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Claims

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Application Information

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Owner SHENZHEN UNIV
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