Electrolyte, electrochemical device, and electronic device
An electrolyte and compound technology, applied in the field of electrochemical devices and electronic devices, can solve problems affecting the cycle performance and high-temperature storage of electrochemical devices, and achieve the effect of improving cycle stability and high-temperature storage performance and improving performance
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[0067] The positive electrode of the present invention can be prepared by a preparation method known in the art. In some embodiments, a positive electrode active material layer can be formed on a positive electrode current collector by using raw materials including lithium transition metal compound powder and a binder. For example, raw materials such as the positive electrode active material (such as the above-mentioned lithium transition metal compound powder) and the binder can be dry-mixed to form a sheet, and the obtained sheet is pressed on the positive electrode current collector to obtain a positive electrode. Alternatively, the above-mentioned raw materials can be dissolved or dispersed in a liquid medium (solvent) to form a slurry, and the formed slurry can be coated on the positive electrode current collector and dried to obtain a positive electrode; wherein, it can also be used as required Materials such as conductive materials and thickeners.
[0068] For example, ...
Embodiment
[0086] (1) Preparation of electrolyte
[0087] In an argon atmosphere glove box with a water content of 6 Dissolving in the above-mentioned mixed solvent to obtain a basic electrolyte; adding additives to the basic electrolyte to obtain an electrolyte; wherein, the additive is one or more of the salt compound shown in formula 1, the polycyano compound and the first compound , the types and contents of additives in each embodiment and comparative examples are shown in Table 1, Table 2 and Table 3, and the contents are calculated based on the total weight of the electrolyte;
[0088] (2) Preparation of battery
[0089] A separator is used to separate the positive electrode and the negative electrode, and the bare cell is formed by winding. The bare cell is placed in the outer package and injected with the above electrolyte, and then undergoes formation, aging and other processes to make a lithium-ion battery;
[0090] Among them, the positive electrode includes a positive elect...
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