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Electrolyte and secondary battery

A technology of electrolyte solution and electrolyte salt, which is applied in the field of batteries, can solve problems such as the deterioration of the electrochemical performance of lithium-ion secondary batteries, and achieve the effect of improving the cycle performance at room temperature

Active Publication Date: 2018-04-03
CONTEMPORARY AMPEREX TECH CO
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Problems solved by technology

However, the transition metal oxide positive electrode active material has a strong oxidizing property in a high SOC state, which causes the electrolyte to easily undergo electrochemical oxidation reaction on the surface of the positive electrode, and at the same time causes a change in the structure of the transition metal oxide positive electrode active material, resulting in nickel, cobalt , manganese and other transition metals undergo a reduction reaction and dissolve, which causes the deterioration of the electrochemical performance of the lithium-ion secondary battery

Method used

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  • Electrolyte and secondary battery
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Embodiment Construction

[0009] The electrolytic solution and the secondary battery according to the present invention will be described in detail below.

[0010] First, the electrolytic solution according to the first aspect of the present invention will be described.

[0011] The electrolytic solution according to the first aspect of the present invention includes an electrolyte salt, an organic solvent, and additives. The additives include cyclotriphosphazene compounds and ethylene carbonate (VEC).

[0012] In the electrolyte solution according to the first aspect of the present invention, the cyclotriphosphazene compound refers to a six-membered ring compound formed by alternating single and double bonds of P and N and its substituted derivatives.

[0013] In the electrolyte solution according to the first aspect of the present invention, the ethylene carbonate can form a reticular passivation film on the surface of the positive electrode active material, effectively inhibiting the oxidation of t...

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Abstract

The invention provides an electrolyte and a secondary battery. The electrolyte comprises an electrolyte salt, an organic solvent and an additive. The additive comprises a cyclotriphosphazene compoundand vinyl ethylene carbonate. When the electrolyte is applied to a secondary battery, the normal temperature cycle performance, high temperature storage performance and high temperature thermal stability of the secondary battery can be improved simultaneously.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to an electrolyte solution and a secondary battery. Background technique [0002] Due to the characteristics of high energy density, long cycle life and no pollution, secondary batteries, especially lithium-ion secondary batteries, have broad application prospects in consumer electronics, power vehicle batteries and energy storage power supplies. [0003] Regardless of the application field, people have put forward higher requirements for the battery life of lithium-ion secondary batteries. In order to improve the energy density of lithium-ion secondary batteries, the development of positive electrode active materials with high specific capacity is one of the effective methods. At present, transition metal oxide cathode active materials have become a research hotspot due to their higher theoretical specific capacity than other cathode active materials. However, the transition me...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M2220/20H01M2220/30H01M2300/0025Y02E60/10
Inventor 张明韩昌隆张翠
Owner CONTEMPORARY AMPEREX TECH CO