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Self-repairing composite solid electrolyte, quasi-solid electrolyte and lithium battery

A solid electrolyte, composite electrolyte technology, applied in the battery field, can solve the problems of low conductivity, battery performance degradation, poor mechanical stability and so on

Active Publication Date: 2019-05-07
SHANGHAI TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the development of lithium metal batteries is limited by the uncontrollable lithium electrodeposition behavior during repeated lithium extraction / intercalation cycles, which leads to the growth of lithium dendrites, resulting in battery short circuit and energy loss.
Moreover, the formation of solid electrolyte interphase (Solid Electrolyte Interphase, SEI) will reduce the Coulombic efficiency of the battery and deteriorate the battery cycle performance.
In addition, the infinite volume expansion of the lithium metal negative electrode will cause the continuous accumulation of interfacial stress, resulting in the collapse of the SEI layer and the continuous increase of the battery interface resistance.
[0003] At present, the methods to improve the stability of lithium metal anode mainly include: introducing artificial SEI layer, interface protection layer, electrolyte additives, etc., and constructing 3D lithium metal pillar materials. However, due to the low conductivity and poor mechanical stability of the interface layer The battery can only be used at a lower current density due to the nature of the battery, while the continuous consumption of electrolyte additives will also make the battery performance continue to decline, and the introduction of additional pillar materials will also reduce the overall energy density of the battery

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  • Self-repairing composite solid electrolyte, quasi-solid electrolyte and lithium battery
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  • Self-repairing composite solid electrolyte, quasi-solid electrolyte and lithium battery

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preparation example Construction

[0041] The second aspect of the present invention provides a method for preparing a self-healing composite solid electrolyte, comprising: preparing an inorganic solid electrolyte, adding the inorganic solid electrolyte into a self-healing polymer to obtain a dispersion system, and preparing it through coating and drying.

[0042] In the preparation method of the self-repairing composite solid electrolyte provided by the present invention, the preparation of the inorganic solid electrolyte includes dissolving gallium nitrate, lithium nitrate, lanthanum nitrate, and zirconium acetylacetonate in a mixed solvent of ethanol-water, and controlling the ethanol-water The volume ratio of the solution is 2:1 to 5:1, adding citric acid to fully complex the metal ions in the solution to obtain a uniform sol. The obtained sol is first heated at 60-90°C for 4 hours, then heated to 180-200°C for 8-12 hours to obtain a gel, and finally fully dried at 200-250°C to obtain a xerogel. The obtaine...

Embodiment 1

[0063] (1) Ga 0.25 Li 6.25 La 3 Zr 2 o 12 Preparation of Inorganic Solid Electrolyte

[0064] According to Ga 0.25 Li 6.25 La 3 Zr 2 o 12 The stoichiometric ratio of gallium nitrate, lithium nitrate, lanthanum nitrate, and zirconium acetylacetonate were uniformly dissolved in the mixed solvent of ethanol-water, and the content of lithium nitrate was 10% in excess to compensate for the loss of lithium source during high-temperature roasting. The volume ratio of ethanol to water is 4:1, then add citric acid to fully complex the cations in the solution to obtain a white sol, then heat at 60°C for 4 hours, then heat up to 180°C for 10 hours to obtain a gel, and The gel was fully dried under the condition of 250° C. to obtain a xerogel. The obtained xerogel was calcined in a muffle furnace at 800° C. for 5 hours to obtain an oxide solid electrolyte.

[0065] (2) Preparation of self-healing composite solid electrolyte

[0066] Take 0.3 g of the self-healing polymer obtai...

Embodiment 2

[0074] (1) Ga 0.5 Li 5.5 La 3 Zr 2 o 12 Preparation of Inorganic Solid Electrolyte

[0075] According to Ga 0.5 Li 5.5 La 3 Zr 2 o 12 The stoichiometric ratio of gallium nitrate, lithium nitrate, lanthanum nitrate, and zirconium acetylacetonate were uniformly dissolved in the mixed solvent of ethanol-water, and the content of lithium nitrate was 10% in excess to compensate for the loss of lithium source during high-temperature roasting. The volume ratio of ethanol to water is 4:1, then add citric acid to fully complex the cations in the solution to obtain a white sol, then heat at 60°C for 4 hours, then heat up to 180°C for 10 hours to obtain a gel, and The gel was fully dried under the condition of 250° C. to obtain a xerogel. The obtained xerogel was calcined in a muffle furnace at 800° C. for 5 hours to obtain an oxide solid electrolyte.

[0076] (2) Composite solid electrolyte

[0077] Take 0.3g of the self-healing polymer shown in Formula 1 and dissolve it uni...

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Abstract

The invention relates to the field of batteries, and in particular to a self-repairing composite solid electrolyte, a quasi-solid electrolyte and a lithium battery. The self-repairing composite solidelectrolyte includes a self-healing polymer including a self-repairing group selected from carbamido, and an inorganic solid electrolyte. The dry basis of the self-repairing composite solid electrolyte can be bent, has flexibility and can inhibit the growth of lithium dendrites, the composite solid electrolyte has a self-repairing function and can prolong the service life of the battery, and little electrolyte containing lithium salt is added into the self-repairing composite solid electrolyte to prepare and obtain a quasi-solid electrolyte which can allow the electrolyte to have high electrical conductivity, can reduce the content of the liquid electrolyte containing the lithium salt and can improve the safety of the battery.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a self-repairing composite solid electrolyte, a quasi-solid electrolyte and a lithium battery. Background technique [0002] Li metal has a high specific capacity (3860mAh g -1 ) and the lowest electrochemical potential (-3.040V relative to the standard hydrogen electrode), it is an ideal negative electrode material for the preparation of lithium batteries. However, the development of lithium metal batteries is limited by the uncontrollable lithium electrodeposition behavior during repeated lithium extraction / intercalation cycles, which leads to the growth of lithium dendrites, resulting in battery short circuit and energy loss. And the formation of solid electrolyte interphase (Solid Electrolyte Interphase, SEI) will cause the decrease of the Coulombic efficiency of the battery and the deterioration of the cycle performance of the battery. In addition, the infinite volume expansion of...

Claims

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Application Information

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IPC IPC(8): H01M10/056H01M10/42H01M10/052
CPCY02E60/10
Inventor 刘巍夏水鑫
Owner SHANGHAI TECH UNIV
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