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Lithium ion battery electrolyte

A lithium-ion battery and electrolyte technology, applied in secondary batteries, organic electrolytes, non-aqueous electrolytes, etc., can solve problems such as poor cycle performance and safety hazards, reduce interface impedance, improve transmission rate, improve cycle performance and The effect of anti-overcharge performance

Inactive Publication Date: 2018-09-28
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a lithium-ion battery electrolyte with the characteristics of anti-overcharging and high-voltage resistance, aiming to solve the problems of poor cycle performance of high-nickel materials and potential safety hazards caused by overcharging.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Example 1 Preparation of electrolyte

[0015] Glove box filled with argon (O 2 2 O 6 -Add 0.4% by mass of methyl phenylsulfite additives to the DMC / EC electrolyte system, shake slightly until the additives are completely dissolved, and the color is light yellow, and electrolyte 1 is obtained.

Embodiment 2～7

[0017] These embodiments are the same as the above embodiment 1, and the differences are shown in Table 1 below:

[0018]

[0019] Note (* in the table means the same as the content described in Example 1 above)

Embodiment 8

[0020] Example 8 Preparation of lithium ion battery

[0021] Lithium nickel manganate (LiNi 0.5 Mn 1.5 O 4 ) As a positive electrode material, acetylene black as a conductive agent, and polyvinylidene fluoride as a binder, mix uniformly according to a mass ratio of 8:1:1, add N-methylpyrrolidone as the material, and after grinding, coat it on the aluminum foil. Dry in an oven at 120°C, roll the punching sheet, and its mass load is 2.78mgcm -2 .

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Abstract

The invention discloses a lithium ion battery electrolyte. The electrolyte comprises electrolyte lithium salt, non-aqueous organic solvent and additive, wherein a major constituent of the additive isbenzene-containing sulfide, the benzene-containing sulfide specifically is at least one or more of phenyl vinyl sulfone, methyl benzenesulfinate, ethyl benzenesulfonate and methyl benzenesulfonate, mass of the additive is 0.1-10.0% of total mass of the electrolyte. The additive used in the electrolyte provided by the invention contains an aromatic nucleus and a sulfur-containing functional group,a special conjugated system of a benzene ring is liable to generate electric polymerization and consequently produces an insulating polymer film, thus, overcharging resisting performance of the lithium ion battery can be improved; the sulfur-containing functional group is beneficial for improving transmission rate of lithium ions between positive electrode interfacial films and reducing interfaceimpedance of the lithium ion battery. By modifying the positive electrode interfacial films with such additive, circulating performance and overcharging resisting performance of a high-voltage seriespositive electrode material can be promoted effectively.

Description

Technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a lithium ion battery electrolyte with the characteristics of preventing overcharge and high voltage resistance. Background technique [0002] Lithium-ion batteries have become an ideal power source for portable devices such as mobile phones and notebook computers due to their advantages of high working voltage, long cycle life, no memory effect and low self-discharge rate. However, the existing lithium-ion batteries have low energy density and power density, and they have insufficient range, cost, safety, and fast charging, and cannot meet the power supply requirements of large equipment such as electric vehicles and hybrid vehicles. Therefore, it is necessary to increase the research and development of high-energy, high-power cathode materials. [0003] The lithium nickel manganese oxide material has a high voltage platform of 4.7V and has become a research hotspot in t...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0567H01M10/4235H01M2300/0025Y02E60/10
Inventor 崔孝玲赵冬妮李春雷李世友王鹏韩亚敏梁有维
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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