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Composite quasi-solid-state electrolyte and preparation method thereof, and lithium battery or lithium ion battery containing composite quasi-solid-state electrolyte

A solid electrolyte, quasi-solid-state technology, applied in the direction of non-aqueous electrolyte battery, electrolyte battery manufacturing, lithium battery, etc., can solve the problems of fragile electrolyte membrane, poor air stability, poor mechanical flexibility, etc., achieve good interface wettability, prevent Effect of volume expansion, good mechanical properties

Inactive Publication Date: 2018-01-30
BEIJING WELION NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Oxide solid electrolyte membrane is fragile, poor mechanical flexibility, difficult to solve the interface contact between electrolyte and positive electrode material, and it is not easy to make a high-capacity battery
[0007] The sulfide solid electrolyte has high conductivity and flexibility, and the problem of interfacial contact is easier to solve. The problem of interfacial contact between the positive electrode and the electrolyte can be solved by cold pressing, but the positive electrode of the sulfide solid electrolyte is chemically unstable, and the sulfide electrolyte High requirements for preparation conditions and poor air stability

Method used

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  • Composite quasi-solid-state electrolyte and preparation method thereof, and lithium battery or lithium ion battery containing composite quasi-solid-state electrolyte
  • Composite quasi-solid-state electrolyte and preparation method thereof, and lithium battery or lithium ion battery containing composite quasi-solid-state electrolyte
  • Composite quasi-solid-state electrolyte and preparation method thereof, and lithium battery or lithium ion battery containing composite quasi-solid-state electrolyte

Examples

Experimental program
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Effect test

Embodiment 1

[0073] Comparative example without adding solid electrolyte

[0074] In this example, the quasi-solid electrolyte membrane was prepared by the second embodiment of the method of the present invention, but in this comparative example, no solid electrolyte was added. Specifically, the quasi-solid electrolyte membrane is prepared in an anhydrous atmosphere at a temperature of 20° C. and a dew point of 30° C. to 50° C. In this comparative example, three quasi-solid electrolyte membranes without solid electrolyte were prepared using the ingredients and contents listed in standard group 1, standard group 2 and standard group 3.

[0075] Standard group 1: 3.3g nano fumed silica (particle size is 7nm), 4.48g LiG3TFSI and binder PTFE powder (0.324g); Wherein, by the total mass of quasi-solid electrolyte composition, the mass fraction of LiG3TFSI is 55.28% (the corresponding volume fraction is 70%; the volume fraction is based on the sum of the volumes of the components before mixing...

Embodiment 2

[0086] In this example, the composite quasi-solid electrolyte membrane is prepared using the second embodiment of the method of the present invention. In this example, a solid electrolyte is added to the composite quasi-solid electrolyte. Specifically, the composite quasi-solid electrolyte membrane is prepared in an anhydrous atmosphere with a temperature of 20°C and a dew point of 30°C to 50°C. In this example, three composite quasi-solid electrolyte membranes containing solid electrolytes were prepared using the components and contents listed in Control Group 1, Control Group 2, and Control Group 3.

[0087] Control group 1 (corresponding to the standard group 1 in embodiment 1): 2.2g nano fumed silica (particle diameter is 7nm), 5.12g LiG3TFSI, 2.5g Li 1.5 Al 0.5 Ge 1.5 (PO 4 ) 3 , Binder PTFE powder (0.41g). Based on the total mass of the composite quasi-solid electrolyte components, the mass fraction of nano fumed silica is 21%, the mass fraction of LiG3TFSI is 50% (...

Embodiment 3

[0105] The preparation method of the composite quasi-solid electrolyte membrane of this embodiment is the same as that of Embodiment 2.

[0106] Control group 4: 2.2g nano fumed silica (particle size is 7nm), 5.12g LiG3TFSI, 3.5gLi 6.75 La 3 Zr 1.75 Ta 0.25 o 12 , Binder PTFE powder (0.45g). Based on the total mass of the composite quasi-solid electrolyte components, the mass fraction of nano fumed silica is 19.5%, the mass fraction of LiG3TFSI is 45% (the corresponding volume fraction is 70%), Li 6.75 La 3 Zr 1.75 Ta 0.25 o 12 The mass fraction of the binder PTFE powder is 31.5%, and the mass fraction of the binder PTFE powder is 4%.

[0107] Control group 5: 2.2g nano fumed silica (particle size is 7nm), 5.12g LiG3TFSI, 8.2gLi 6.75 La 3 Zr 1.75 Ta 0.25 o 12 , Binder PTFE powder (0.646g). Based on the total mass of the composite quasi-solid electrolyte components, the mass fraction of nano fumed silica is 13.6%, the mass fraction of LiG3TFSI is 31.7% (the corre...

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Abstract

The present invention provides a composite quasi-solid-state electrolyte, a composite quasi-solid-state electrolyte membrane, preparation methods of composite quasi-solid-state electrolyte and the composite quasi-solid-state electrolyte membrane, and a lithium battery or a lithium ion battery containing the composite quasi-solid-state electrolyte membrane. The composite quasi-solid-state electrolyte comprises a solid electrolyte, a lithium salt-containing liquid electrolyte, inorganic nanoparticles and a binder, wherein the static electricity or functional groups on the surface of the inorganic nanoparticles can adsorb the electrolyte so as to make the composite quasi-solid-state electrolyte have strong adsorption capacity and strong liquid retention ability, and the inorganic nanoparticles can adsorb the lithium salt so as to change the lithium ion conduction mechanism, reduce the interfacial resistance between the liquid electrolyte and the solid-state electrolyte, change the deposition morphology of lithium, hinder the formation of lithium dendrite, and reduce the pulverization of lithium. In addition, by adding the solid electrolyte, the composite quasi-solid-state electrolyteof the present invention can maintain the high conductivity and can effectively reduce the content of the liquid electrolyte so as to improve the safety of the battery.

Description

technical field [0001] The invention relates to the technical field of electrochemistry and new energy materials, in particular to a composite quasi-solid electrolyte and a preparation method thereof, and a lithium battery or a lithium ion battery comprising the composite quasi-solid electrolyte. Background technique [0002] At present, lithium-ion batteries have the highest energy density among commercial batteries, and are widely used in various small electronic products and electric vehicles. In recent years, the rapid development of electric vehicles and energy storage industries has put forward higher requirements on the energy density, cost and safety of lithium-ion batteries. [0003] Lithium metal is considered to be the fourth-generation negative electrode, with the highest capacity of 3860mAh / g and a lower deposition potential of -3.04V; the use of lithium metal as the negative electrode can significantly increase the energy density of existing lithium-ion batteri...

Claims

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Application Information

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IPC IPC(8): H01M10/0562H01M10/058H01M10/0525H01M10/052
CPCY02E60/10Y02P70/50
Inventor 黄杰彭佳悦李泓陈立泉
Owner BEIJING WELION NEW ENERGY TECH CO LTD
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