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High-voltage lithium ion battery combined electrolyte additive, electrolyte and battery thereof

A lithium-ion battery pack and electrolyte additive technology, applied in secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve the problem of increasing battery polarization and impedance, deterioration of battery electrochemical performance, and increased polarization and other problems, to achieve the effect of reducing impedance, adding a small amount, and reducing polarization

Inactive Publication Date: 2020-05-29
SONGSHAN LAKE MATERIALS LAB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under high voltage, the decomposition of cyclic sulfate at the positive electrode interface is more complete, and a thicker interfacial film will be formed on the surface of the positive and negative electrodes, resulting in increased polarization and increased impedance. Similarly, under high voltage, the P-O The / Si-O compound will form a thicker interfacial film on the surface of the positive and negative electrodes, further increasing the polarization and impedance of the battery, resulting in deterioration of the electrochemical performance of the battery

Method used

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  • High-voltage lithium ion battery combined electrolyte additive, electrolyte and battery thereof
  • High-voltage lithium ion battery combined electrolyte additive, electrolyte and battery thereof
  • High-voltage lithium ion battery combined electrolyte additive, electrolyte and battery thereof

Examples

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Effect test

Embodiment 1

[0021] Preparation of combined electrolyte for high-voltage lithium-ion batteries:

[0022] In a glove box filled with argon (moisture 6 , and stirred until it was completely dissolved to obtain the combined electrolyte solution A1 for a high-voltage lithium-ion battery. Drop 0.2ml of A1 electrolyte onto the surface of the positive electrode sheet, seal it with a sealed box, and observe the complete soaking time of the electrolyte.

[0023] Preparation of high-voltage lithium-ion batteries:

[0024] Will LiNi 0.5 mn 1.5 o 4(LNMO) is used as the positive electrode active material, carbon black is used as the conductive additive, and carboxymethyl cellulose (CMC), styrene-butadiene copolymer (SBR) is used as the binder, and the mass ratio is 92:5:1 :2 After mixing evenly in water, coat the aluminum foil current collector, dry, cold press, cut into discs with a diameter of φ14mm, and place them in the glove box. Graphite is used as the negative electrode active material, car...

Embodiment 2

[0026] Its difference from Example 1 is the preparation of high-voltage lithium-ion battery combined electrolyte:

[0027] In a glove box filled with argon (moisture 6 , and stirred until it was completely dissolved to obtain a combined electrolyte solution A2 for a high-voltage lithium-ion battery. Drop 0.2ml of A2 electrolyte onto the surface of the positive electrode, seal it with a sealed box, and observe the time for the electrolyte to fully infiltrate.

Embodiment 3

[0029] Its difference from Example 1 is the preparation of high-voltage lithium-ion battery combined electrolyte:

[0030] In a glove box filled with argon (moisture 6 , and stirred until it was completely dissolved to obtain the combined electrolyte solution A3 for a high-voltage lithium-ion battery. Drop 0.2ml of A3 electrolyte onto the surface of the positive electrode sheet, seal it with a sealed box, and observe the complete soaking time of the electrolyte.

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Abstract

The invention discloses a high-voltage lithium ion battery combined electrolyte additive, an electrolyte and a battery thereof. The high-voltage lithium ion battery combined electrolyte additive provided by the invention is prepared by mixing a compound containing cyclic thioester, a compound containing P-O and Si-O bonds and a compound which does not contain Si-O / P-O bonds but contains B-O bonds,and under a high voltage, a component A is oxidized and decomposed at an interface of a positive electrode to form a stable CEI film and is reduced on a surface of a negative electrode to generate astable SEI film so that efficiency of a battery can be improved; by adding a component B, wettability of the electrolyte to the electrode can be improved, a stable CEI film can be formed on the surface of the positive electrode, and the efficiency of the battery is further increased while the wettability is improved; and through a component C, a B-O-containing interface film can be formed on the surfaces of the positive electrode and the negative electrode, the B-O interface film has high ionic conductivity, an impedance of the battery can be significantly reduced, polarization of the batteryis decreased, and cycle performance is improved.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a high-voltage lithium-ion battery combined electrolyte additive, electrolyte and battery thereof. Background technique [0002] At present, due to the continuous decline of government subsidies, power batteries, as an upstream enterprise in the new energy vehicle industry chain, are bound to be affected accordingly. In order to alleviate this problem, we should focus on the research and development of new system power batteries, significantly improve energy density, greatly reduce costs, and realize the practical and large-scale application of new system power batteries. [0003] Lithium nickel manganese oxide with a spinel structure is a new type of high-voltage cathode material with a plateau voltage of ~4.7V (vs.Li / Li + ), the theoretical specific capacity is 146.7mAh / g, the reversible specific capacity is ~133mAh / g, and the energy density is as hig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0567H01M10/4235Y02E60/10
Inventor 詹元杰黄学杰武怿达马晓威闫勇
Owner SONGSHAN LAKE MATERIALS LAB
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