A kind of electrolytic solution, positive pole and its preparation method and a kind of lithium ion battery

An electrolyte and cathode technology, applied in non-aqueous electrolyte battery electrodes, battery electrodes, secondary batteries, etc., can solve problems such as failure to work properly, side reactions, and battery cycle performance degradation, and achieve protection from excessive consumption and protection. The effect of not being damaged and improving the lifespan
CN107331892BActive Publication Date: 2021-06-18BYD CO LTD
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
BYD CO LTD
Publication Date
2021-06-18

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Abstract

The invention provides an electrolyte, a positive electrode, a preparation method thereof, and a lithium ion battery, wherein the electrolyte includes a lithium salt, an electrolyte solvent and an additive, and the additive is the boric acid pinacid compound provided by the application; In the electrolyte provided by the present invention, by using the boric acid pinacid compound of the structure described in the present invention as the specific additive of the present invention, the positive electrode can be protected from being damaged, and the electrolyte solvent can also be protected from being oxidized and decomposed under high potential. (excessive consumption), prolong battery life under high voltage.
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Description

technical field

[0001] The invention belongs to the field of lithium ion batteries, and in particular relates to an electrolyte, a positive electrode, a preparation method thereof and a lithium ion battery. Background technique

[0002] Since the 1990s, lithium-ion secondary batteries have developed rapidly from their birth. Generally speaking, a lithium-ion battery with an electrolyte includes a casing, a cell contained in the casing, and an electrolyte. The cell includes a positive electrode, a negative electrode, and a separator between the positive electrode and the negative electrode. During charging, lithium ions migrate from the positive electrode through the electrolyte to the negative electrode, while they flow in the opposite direction during discharging. In recent years, secondary lithium-ion batteries with high energy density have become the object of people's attention. Therefore, people have also noticed some new active materials that can be used as secondary ...

Claims

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