Non-aqueous electrolyte of high-voltage lithium ion batteries
A lithium-ion battery, non-aqueous electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve problems such as poor electrolyte cycle performance, improve normal temperature cycle performance, reduce side reactions, and improve conductivity. Effect
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[0020] Example 1
[0021] The electrolyte was prepared in a BRAUN glove box. The glove box was filled with nitrogen with a purity of 99.999%. The moisture in the glove box was controlled at ≤5ppm and the temperature was at room temperature. Mix 30 grams of EC and 70 grams of EMC evenly, seal it, put it in the refrigerator and wait for it to cool to 8°C, then transfer it to the glove box, then add LiPF6 in two batches and mix thoroughly to form a lithium salt molar concentration of 1mol / L The non-aqueous electrolyte of the lithium-ion battery is added to the above non-aqueous electrolyte by adding 2-(2-thienylthio)thiophene (CAS: 3988-99-6, purchased from Alfa Aesar Chemical) with a total mass of 0.1% of the solvent Co., Ltd.), uniformly mixed to obtain a high-voltage lithium-ion non-aqueous electrolyte.
Example Embodiment
[0022] Example 2
[0023] The electrolyte was prepared in a BRAUN glove box. The glove box was filled with nitrogen with a purity of 99.999%. The moisture in the glove box was controlled at ≤5ppm and the temperature was at room temperature. Mix 30 grams of EC, 35 grams of EMC and 35 grams of DEC evenly, seal it, put it in the refrigerator and wait for it to cool to 8°C, transfer it to the glove box, and then add LiPF6 in two batches and mix well to form a mole of lithium salt. The non-aqueous electrolyte of lithium ion battery with a concentration of 1.2mol / L is added to the above non-aqueous electrolyte with 2-(2-thienylthio)thiophene (CAS: 3988-99-6, purchased from 0.3% of the total mass of the solvent) from Alfa Aesar Chemical Co., Ltd.), uniformly mixed to obtain a high-voltage non-aqueous electrolyte.
Example Embodiment
[0024] Example 3
[0025] The electrolyte was prepared in a BRAUN glove box. The glove box was filled with nitrogen with a purity of 99.999%. The moisture in the glove box was controlled at ≤5ppm and the temperature was at room temperature. Mix 40 grams of EC, 60 grams of EMC and 20 grams of DEC evenly, seal it and put it in the refrigerator to cool to 8°C, transfer it to the glove box, and then add LiPF6 in two batches and mix well to form the molar concentration of lithium salt. It is the non-aqueous electrolyte of 1.2mol / L high-voltage battery, and 2-(2-thienylthio)thiophene (CAS: 3988-99-6, purchased from 0.5% of the total solvent mass) is added to the above non-aqueous electrolyte. Alfa Aesar Chemical Co., Ltd.), uniformly mixed to obtain a high-voltage lithium-ion non-aqueous electrolyte.
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