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High and low temperature performance-considered high-voltage electrolyte and lithium ion battery thereof

A lithium-ion battery and electrolyte technology, applied in the field of lithium-ion batteries, can solve the problems of increasing negative electrode impedance, affecting the low-temperature performance of the battery, and easy reduction and dissolution of transition metal oxides, etc., and achieves excellent cycle performance.

Active Publication Date: 2019-04-16
ZHUHAI SMOOTHWAY ELECTRONICS MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, at high temperature, the LiPF in the electrolyte 6 It is extremely easy to decompose and produce HF to corrode the positive electrode active material, resulting in the dissolution of metal ions; on the other hand, under high voltage, the transition metal oxide of the positive electrode active material is easily reduced and dissolved, and the transition metal ion passes through the SEI film on the surface of the negative electrode. It is reduced to a single metal substance, which leads to a continuous increase in the negative electrode impedance, which in turn affects the low temperature performance of the battery

Method used

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  • High and low temperature performance-considered high-voltage electrolyte and lithium ion battery thereof
  • High and low temperature performance-considered high-voltage electrolyte and lithium ion battery thereof
  • High and low temperature performance-considered high-voltage electrolyte and lithium ion battery thereof

Examples

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Effect test

Embodiment 1

[0031] 1) Preparation of electrolyte

[0032] Mix ethylene carbonate (EC), ethyl methyl carbonate (EMC) and diethyl carbonate (DEC) according to the mass ratio EC:EMC:DEC=1:1:1, and then add lithium hexafluorophosphate (LiPF 6 ) to a molar concentration of 1mol / L, and then add 1% ethylene tricarbonate based on the total mass of the electrolyte.

[0033] 2) Preparation of positive plate

[0034] Mix the cathode active material LiCoO with a mass ratio of 93:4:3 2 Doped with LiNi 0.5 co 0.2 mn 0.3 o 2 Mixed materials (where the mass ratio of LiCoO 2 :LiNi 0.5 co 0.2 mn 0.3 o 2 =1:1), conductive carbon black Super-P and binder polyvinylidene fluoride (PVDF), and then disperse them in N-methyl-2-pyrrolidone (NMP) to obtain positive electrode slurry. The slurry is uniformly coated on both sides of the aluminum foil, dried, calendered and vacuum-dried, and an aluminum lead-out wire is welded on by an ultrasonic welder to obtain a positive plate with a thickness of 120-150 ...

Embodiment 2

[0057] Except that the addition of cyclotricarbonate was reduced from 1% to 0.1% in the preparation of the electrolyte, the others were the same as in Example 1, and the normal temperature cycle performance, high temperature cycle performance, high temperature storage performance and low temperature storage performance obtained from the test are shown in the table 1.

Embodiment 3

[0059] Except that the addition of cyclotricarbonate was increased from 1% to 2% in the preparation of the electrolyte, the others were the same as in Example 1, and the normal temperature cycle performance, high temperature cycle performance, high temperature storage performance and low temperature storage performance obtained from the test are shown in the table 1.

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Abstract

The invention discloses a high and low temperature performance-considered high-voltage electrolyte and a lithium ion battery thereof. The electrolyte comprises electrolyte salt, a non-aqueous organicsolvent and a functional additive, wherein the function additive is cyclo tris-ethylene carbonate. Through adding the function additive, the lithium ion battery electrolyte can generate a layer of compact and uniform protection film on the surface of electrodes in the formation stage, so as to decrease secondary reaction between electrode materials and the electrolyte, make the cycle performance of the battery excellent and give consideration to both the high and low temperature performance.

Description

[technical field] [0001] The invention belongs to the technical field of lithium ion batteries, and more specifically, the invention relates to a nonaqueous electrolyte functional additive, a nonaqueous electrolyte and a lithium ion battery using the nonaqueous electrolyte. [Background technique] [0002] Compared with lead-acid batteries, nickel-hydrogen batteries, and nickel-cadmium batteries, lithium-ion secondary batteries have the advantages of high working voltage, high specific energy density, long cycle life, low self-discharge rate, no memory effect, and low environmental pollution. It is used in various electronic consumer goods markets, and is also an ideal power source for electric vehicles and various electric tools. Further increasing the working voltage or platform voltage of the lithium-ion secondary battery can effectively increase the energy density of the lithium-ion battery. [0003] Cobalt is a strategic resource. my country's cobalt resources are limit...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M2300/0025Y02E60/10
Inventor 毛冲刘文博熊伟黄秋洁王霹雳梁洪耀何秀娟于智力戴晓兵
Owner ZHUHAI SMOOTHWAY ELECTRONICS MATERIALS
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