High-concentration electrolyte for lithium ion battery, preparation method thereof, and lithium ion battery

A lithium-ion battery and electrolyte technology, which is applied in the field of high-concentration electrolyte for lithium-ion batteries and its preparation, to achieve the effects of improving battery energy density, small reaction polarization, and good kinetic characteristics
CN109449487AInactive Publication Date: 2019-03-08NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
Publication Date
2019-03-08
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides a high-concentration electrolyte for a lithium ion battery. The electrolyte comprises lithium salt, a non-aqueous solvent and a wetting agent; the concentration of the lithium salt is higher than 2 mol / L; and the wetting agent is selected from fluoro-ether compounds. The wetting agent is added in the electrolyte, so that the viscosity of the electrolyte is reduced and the wettability is improved while the high concentration is ensured; the dynamic characteristic of the electrochemical reaction on the electrode / electrolyte interface is good, and the reaction polarizationis small. Therefore, the wetting agent is added in the electrolyte so that the safety of the electrolyte can be improved, the protection of an aluminum current collector is realized, the viscosity ofthe high-concentration electrolyte is reduced, and the problem of poor wettability of the electrolyte is solved; and the electrochemical stable voltage of the electrolyte exceeds 4.5V, so the electrolyte is suitable for a high-voltage positive electrode material; the capacity of the battery is fully played; and the energy density of the battery is improved.
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Description

Technical field

[0001] The invention belongs to the technical field of lithium-ion batteries, and specifically relates to a high-concentration electrolyte for lithium-ion batteries, a preparation method thereof, and a lithium-ion battery. Background technique

[0002] Lithium-ion batteries are widely used in portable electronic devices such as consumer electronics and power tools because of their advantages of high energy density and long cycle life, and are popularized in large-scale energy storage fields such as smart grids and electric vehicles. People put forward higher requirements for its energy density, cycle life, and safety. A key factor in improving the energy density of lithium-ion batteries is the development of high-voltage lithium-ion batteries. As a key component of the battery system, the electrolyte determines the current density, cycle stability and safety of the battery, and is a guarantee for the application of high-voltage electrode materials. . At present,...

Claims

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