High-voltage lithium ion battery electrolyte additive, electrolyte, battery and formation method thereof

An electrolyte additive, a technology for lithium ion batteries, applied in the field of lithium ion batteries, can solve the problems of inability to suppress the destruction of the transition metal ion anode interface film, limited improvement of battery electrochemical performance, inability to prevent HF corrosion damage, etc. The effect of popularizing application, improving electrochemical performance, improving efficiency and cycle performance

Inactive Publication Date: 2020-06-05
SONGSHAN LAKE MATERIALS LAB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the halogenated pyridine compound cannot be decomposed under low pressure, and without a special chemical conversion method, it cannot form a tight and stable interfacial film on the surface of the positive and negative electrodes, and cannot suppress the electrolyte under high voltage, especially at high temperature. The side reaction with the positive electrode interface cannot prevent HF from corroding and destroying the positive electrode interface, and at the same time cannot inhibit the dissolution of transition metal ions and the destruction of the negative electrode interface film, etc., and the improvement of the electrochemical performance of the battery is relatively limited.
[0007] Publication number "CN108321433A", the patent titled "An electrolyte additive and electrolyte for improving the low-temperature performance of lithium-ion batteries" discloses an electrolyte additive and electrolyte for improving the low-temperature performance of lithium-ion batteries. The pyridine of the group is used as an additive to improve the low-temperature performance of the lithium-ion battery. Through the negative charge tendency of the nitrogen atom in the pyridine, it forms a synergistic effect with the lithium salt to improve the ionic and electronic capabilities of the electrolyte, and at the same time utilizes the hydrophobicity and hydrophilicity of the alkyl group. The imine group reduces the surface tension of the electrolyte and improves the wettability of the electrolyte, thereby improving the low-temperature cycle performance of the lithium-ion battery. However, the pyridine additive has not undergone high-voltage and high-temperature formation, and has not been used on the positive and negative electrodes. A tight and stable interfacial film is formed at the interface, which has limited improvement in battery cycle performance

Method used

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

Examples

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Effect test

Embodiment 1

[0027] Preparation of high-voltage lithium-ion battery electrolyte:

[0028] In a glove box filled with argon (moisture 6 , and stirred until it was completely dissolved to obtain high-voltage lithium-ion battery electrolyte solution A1.

[0029] Preparation of high-voltage lithium-ion batteries:

[0030] 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, carbon black is used as the conductive additive, and the copolymer (SBR) of carboxymethylcellulose (CMC) and styrene and butadiene is used as the binder, according to the mass ratio of 93:2:2: 3 After ...

Embodiment 2

[0034] It is different from Example 1 in the preparation and formation of high-voltage lithium-ion battery electrolyte:

[0035] In a glove box filled with argon (moisture 6 , and stirred until it was completely dissolved to obtain high-voltage lithium-ion battery electrolyte A2.

[0036] After the prepared button battery was placed at 45°C for 10 hours, the battery was formed at 0.05C at 45°C using a blue battery charge and discharge tester (purchased from Wuhan Landian Electronics Co., Ltd.) , and then perform a loop test.

Embodiment 3

[0038] It is different from Example 1 in the preparation and formation of high-voltage lithium-ion battery electrolyte:

[0039] In a glove box filled with argon (moisture 6 , and stirred until it was completely dissolved to obtain high-voltage lithium-ion battery electrolyte A3.

[0040] After the prepared button battery was placed at 45°C for 10 hours, the battery was formed at 0.05C at 45°C using a blue battery charge and discharge tester (purchased from Wuhan Landian Electronics Co., Ltd.) , and then perform a loop test.

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Abstract

The invention discloses a high-voltage lithium ion battery electrolyte additive, an electrolyte, a battery and a formation method thereof. The high-voltage lithium ion battery electrolyte additive provided by the invention is a pyridyl compound, formation is carried out at high temperature and high voltage, the pyridine compound additive is relatively sufficiently decomposed, a stable interface film containing Li<x>NO<y> is formed on the surfaces of the positive electrode and the negative electrode, and side reactions on the electrolyte and a positive electrode interface are inhibited under high voltage; and meanwhile, dissolution of transition metal ions and damage of the transition metal ions to a negative electrode interface film are inhibited, the efficiency and the cycle performance of the battery are improved, especially the electrochemical performance of the battery at high temperature is improved, and the invention has the advantages of small addition amount, low cost, simple synthesis and the like, is easy to implement and is beneficial to wide popularization and application.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to an electrolyte additive for a high-voltage lithium-ion battery, an electrolyte, a battery and a formation method thereof. Background technique [0002] The development of new energy vehicles is an important strategic measure to effectively address energy and environmental challenges. The development of new energy vehicles is the only way for my country to move from a "big auto country" to a "powerful auto country". In recent years, the production and sales of new energy vehicles have shown a blowout growth, and the global stock has exceeded 1.3 million, which has entered the stage of large-scale industrialization. In order to meet the needs of electric vehicles to run farther, run faster, and be safer and more convenient, it is the development of power battery technology to further increase specific energy and specific power, prolong service life and sh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/42H01M10/44
CPCH01M10/0525H01M10/0567H01M10/4235H01M10/443H01M2300/0025Y02E60/10
Inventor 詹元杰黄学杰武怿达马晓威闫勇
Owner SONGSHAN LAKE MATERIALS LAB
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