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Electrolyte and preparation method of a kind of spinel structure lithium nickel manganese oxide lithium ion battery

A technology of lithium-ion battery and spinel structure, which is applied in the direction of secondary battery, secondary battery repair/maintenance, circuit, etc., can solve the problem that the cycle performance cannot meet the needs of equipment, and achieve the effect of good cycle performance

Active Publication Date: 2019-10-29
湖南锂顺能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The object of the present invention is to provide an electrolyte and a preparation method for a spinel structure lithium nickel manganese oxide lithium ion battery, so as to solve the problem that the cycle performance of the existing spinel structure lithium nickel manganese oxide lithium ion battery cannot meet the requirements of the equipment. technical questions required

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  • Electrolyte and preparation method of a kind of spinel structure lithium nickel manganese oxide lithium ion battery
  • Electrolyte and preparation method of a kind of spinel structure lithium nickel manganese oxide lithium ion battery
  • Electrolyte and preparation method of a kind of spinel structure lithium nickel manganese oxide lithium ion battery

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preparation example Construction

[0080] According to another aspect of the embodiments of the present invention, there is provided a method for preparing an electrolyte for a lithium-ion battery with a spinel structure nickel manganese oxide, the method comprising the following steps:

[0081] Weighing the organic solvent and the ionic liquid, stirring the organic solvent and the ionic liquid evenly at a humidity of less than 8ppm and a temperature of 25±1°C to obtain a non-aqueous organic solvent;

[0082] Weighing the lithium salt, slowly adding the lithium salt to the non-aqueous organic solvent, and stirring until the lithium salt is completely dissolved;

[0083] Weighing the additive, slowly adding the additive into the non-aqueous organic solvent in which the lithium salt is dissolved, stirring, and standing still, to obtain the spinel-structure lithium nickel manganese oxide lithium-ion battery electrolyte.

Embodiment 1

[0086] In a glove box filled with argon, diethyl carbonate, propylene carbonate and dibutyl carbonate were mixed in parts by mass of 15, 15 and 25 respectively, stirred continuously until uniform, and then 25 ions by mass were slowly added liquid to obtain a non-aqueous organic solvent; then add lithium trifluoromethanesulfonate with a mass fraction of 12 to the non-aqueous organic solvent, and continue to add mass fractions after the lithium trifluoromethanesulfonate is completely dissolved. 2 parts of triphenyl phosphite, 3 parts by mass of vinylene carbonate, and 3 parts by mass of cyclohexylbenzene were stirred evenly to obtain an electrolyte solution for a lithium-ion battery with a spinel structure nickel manganese oxide.

[0087] Wherein, the ionic liquid cation is a quaternary phosphonium ion; the humidity in the glove box is less than 8ppm, and the temperature is 25±1°C.

Embodiment 2

[0089] In a glove box filled with argon, diethyl carbonate, propylene carbonate, and dibutyl carbonate were mixed in parts by mass of 15, 15 and 25, and stirred continuously until uniform, and then slowly added in parts by mass of 15 ions liquid to obtain a non-aqueous organic solvent; then add lithium trifluoromethanesulfonate with a mass fraction of 12 to the non-aqueous organic solvent, and continue to add mass fractions after the lithium trifluoromethanesulfonate is completely dissolved. 2 parts of triphenyl phosphite, 3 parts by mass of vinylene carbonate, and 3 parts by mass of cyclohexylbenzene were stirred evenly to obtain an electrolyte solution for a lithium-ion battery with a spinel structure nickel manganese oxide.

[0090] Wherein, the ionic liquid cation is a quaternary phosphonium ion; the humidity in the glove box is less than 8ppm, and the temperature is 25±1°C.

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Abstract

The invention discloses an electrolyte of a spinel-structured nickel lithium manganate lithium ion battery and a preparation method of the electrolyte. The electrolyte comprises 30-60 parts by mass of an organic solvent, 50-15 parts by mass of a lithium salt, 15-30 parts by mass of ionic liquid and 5-10 parts by mass of an additive. For a lithium ion battery prepared with the electrolyte provided by embodiments of the invention, the capacity retention ratio reaches 90.33% after cycling for 3000 times at a 1C multiple rate, reaches 88.5% after cycling for 1500 times at a 2C multiple rate, and reaches 85.0% after cycling for 800 times at a 3C multiple rate, which shows that the electrolyte provided by the invention can still show good cycle performance after charging and discharging for a plurality of times under high voltages and at different multiple rates.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to an electrolyte solution and a preparation method of a spinel structure lithium nickel manganese oxide lithium ion battery. Background technique [0002] Lithium-ion battery is a secondary battery that mainly relies on the movement of lithium ions between the positive and negative electrodes to work. When charging, lithium ions are deintercalated from the positive electrode, inserted into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true when discharging. Due to the significant advantages of high working voltage, no memory effect, low self-discharge rate, long cycle life and high energy density, lithium-ion batteries have become the first choice for portable electronic device batteries. However, with the diversification of corresponding equipment functions, the power consumption of equipment p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0569H01M10/0568H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0567H01M10/0568H01M10/0569H01M10/4235Y02E60/10
Inventor 沈智何鹏飞郑拥军陈建华肖毅陈恩赐
Owner 湖南锂顺能源科技有限公司