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An electrolyte and electrochemical technology, applied in the field of energy storage materials, can solve the problems of cycle performance and storage performance to be improved, achieve excellent high temperature and high pressure cycle performance and storage performance, reduce reduction and decomposition, and reduce the effect of battery gas production
Active Publication Date: 2019-01-22
CONTEMPORARY AMPEREX TECH CO
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However, there are still many deficiencies in the above-mentioned electrolyte system. For example, under high voltage and high temperature conditions, the cycle performance and storage performance of the above-mentioned electrolyte system need to be improved.
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preparation example Construction
[0139] (1) Preparation of the compound of general formula I-1:
[0140] Its reaction equation is:
[0141]
[0142] The specific preparation process is:
[0143] 1. Add the P-2 aqueous solution with a concentration of 30-40% to the raw material P-1 dropwise within 20-60 minutes and stir rapidly. After the dropwise addition, stir rapidly for 15-30 hours, and stir in an oil bath at 70-90°C for 3-5 hours under reflux. A colorless fuming viscous liquid intermediate product I-1-1 was obtained;
[0144] 2. Continue to join K 2 CO 3 , KI, anhydrous acetonitrile; stir quickly to form a solid-liquid mixed phase, quickly add raw material P-3 at 40-60°C, continue stirring for 10-20h, then cool to room temperature, separate and purify to obtain the compound shown in formula I-1.
[0145] (two) preparation of general formula I-2 compound:
[0146] Its reaction equation is:
[0147]
[0148] The specific preparation process is:
[0149] Anhydrous sodium carbonate, raw material ...
Synthetic example 1
[0156]
[0157] 1. Add 37% formaldehyde aqueous solution dropwise to 1,3-propylenediamine within 0.5h and stir rapidly. After the dropwise addition, stir rapidly for 20h, then reflux and stir in an oil bath at 80°C for 4h to obtain a colorless fuming viscous liquid intermediate product Hexahydropyrimidine;
[0158] 2. Continue to join K 2 CO 3 , KI, anhydrous acetonitrile; stir quickly to form a solid-liquid mixed phase, add β-chloropropionitrile within 0.5h at 60°C, continue stirring for 17h, cool to room temperature, separate and purify to obtain the compound of formula A2.
[0159] Carbon NMR spectrum such as figure 1 shown.
Synthetic example 2
[0161]
[0162] Anhydrous sodium carbonate, piperazine and β-chloropropionitrile were mixed in absolute ethanol, and the reaction was stirred for 4h. The crude product was obtained by washing with hot ethanol several times, and recrystallized to obtain the compound of formula A8.
[0163] Carbon NMR spectrum such as figure 2 shown.
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Abstract
The present application relates to the field of energy storage materials, in particular to an electrolyte and an electrochemical device. The electrolyte solution of the present application contains additive A, additive B and additive C, and additive A is selected from the group consisting of Formula I-1. Formula I-Formula I-3, additive B is selected from at least one of the sulfonate compounds, and additive C is selected from at least one of the halogen-substituted cyclic carbonate compounds. The electrochemical device of the present application contains the electrolyte. The electrolyte of thepresent invention can effectively passivate the surface activity of the positive electrode material, inhibit the oxidation of the positive electrode material to the electrolyte, effectively reduce the gas production of the battery, and form a more stable SEI film adsorbed on the catalytic active point on the surface of the graphite, thereby significantly reducing the occurrence of side reactions.The electrochemical device using the electrolyte of the present application has excellent high temperature and high pressure cycling performance and storage performance. (image. file= 'DDA0001350629020000011. TIF' wi= '700' he= '224'/)
Description
technical field [0001] The present application relates to the field of energy storage materials, in particular, to an electrolyte and an electrochemical device. Background technique [0002] Lithium-ion batteries are widely used in electric vehicles and consumer electronics due to their advantages such as high energy density, high output power, long cycle life and low environmental pollution. The current demand for lithium-ion batteries is: high voltage, high power, long cycle life, long storage life and excellent safety performance. [0003] Lithium-ion batteries are currently widely used in an electrolyte system using lithium hexafluorophosphate as a conductive lithium salt and cyclic carbonate and / or chain carbonate as a solvent. However, there are still many deficiencies in the above-mentioned electrolyte system, for example, under the condition of high voltage and high temperature, the cycle performance and storage performance of the above-mentioned electrolyte system ...
Claims
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