Organic in-situ interface modified solid electrolyte and preparation method thereof
A solid electrolyte and interface modification technology, which is applied in the manufacture of electrolyte batteries, composite electrolytes, and non-aqueous electrolyte batteries, etc., can solve problems such as limiting the development and application of composite solid electrolytes, affecting the migration rate of lithium ions, and poor contact interface compatibility. Achieve the effects of improving room temperature ionic conductivity and mechanical strength, facilitating large-scale production, and reducing interface impedance
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[0034] A method of preparation of the above solid electrolyte, characterized in that the following steps are included:
[0035] Step 1: Add the inorganic solid electrolyte to N, N-dimethylacetamide, ultrasonic treatment for 10 to 60 min, produce an inorganic solid electrolyte dispersion; dopamine (inorganic solid electrolyte and dopamine inorganic solid electrolyte and dopamine) is added to the dispersion. The ratio is 0.1 to 1: 1), stirred is uniform, then the buffer trimethylmethylmethhane hydrochloride is added, and the pH is continued to be stirred at 8.0-9.0, 30 to 100 ° C, and the mixture is stirred from 5 to 20 h, and after washing, the polyopamine surface is obtained. Modified inorganic solid electrolyte.
[0036] Step 2: Add the polymer solid electrolyte to N, N-dimethylacetamide, dissolved uniform, add the inorganic solid electrolyte obtained by adding the polyopamine surface obtained by the step, and the lithium salt (weight ratio is 30 ~ 70:20 ~ 50:5 ~ 20) and selectiv...
Embodiment 1
[0039] Step (1): Add 10 g of LLZTO inorganic solid electrolyte to 20 mL N, N-dimethylacetamide, ultrasonic treatment for 30 min, prepared to obtain a llZTO inorganic solid-state electrolyte dispersion; 10 g of dopamine of hydrochloride is added to the dispersion, stir well, Then 20 ml of buffer trihymethylmethylmethane hydrochloride is added, and pH to 8.5 is adjusted, and stirring at 60 ° C for 10 h, and the centrifugal cleaning can be obtained, that is, the inorganic solid electrolyte surface modified by polybatamine is obtained;
[0040] Step (2): Add 2.5 g of polyoxyethylene to N, N-dimethylacetamide, dissolved uniform, add 7g step (1), the polyopamine surface modified inorganic solid electrolyte and 0.5 g of 0.5g double (three) Fluoromethylsylsulfonyl) imide lithium, stirred is uniform, coated on a glass carrier, dry, and then obtain solid electrolytes modified by an organic ingenuity interface.
Embodiment 2
[0042] Step (1): Add 10 g of LLZTO inorganic solid electrolyte to 20 mL N, N-dimethylacetamide, ultrasonic treatment for 30 min, prepared to obtain an LLZTO inorganic solid-state electrolyte dispersion; 20 g of dopamine of hydrochloride is added to the dispersion, stir well, Then 40 ml of buffer trihymethylmethylmethane hydrochloride has been added, and pH is adjusted to be stirred at 60 ° C for 10 h, and the centrifugal cleaning can be obtained from the inorganic solid electrolyte surface modified.
[0043] Step (2): Add 2.5 g of polyoxyethylene to N, N-dimethylacetamide, dissolved uniform, add 7g step (1), the polyopamine surface modified inorganic solid electrolyte and 0.5 g of 0.5g double (three) Fluoromethylsylsulfonyl) imide lithium, stirred is uniform, coated on a glass carrier, dry, and then obtain solid electrolytes modified by an organic ingenuity interface.
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