A kind of lithium-ion battery non-aqueous electrolyte and lithium-ion battery

A lithium-ion battery and non-aqueous electrolyte technology, applied in the field of lithium-ion batteries, can solve problems that affect battery life and safety performance, low conductivity of lithium-ion battery electrolyte, collapse and damage of positive electrode material structure, etc., and achieve FEC suppression Effects of producing gas, increasing the electrochemical window, and improving kinetic properties

Active Publication Date: 2021-01-15
SHANSHAN ADVANCED MATERIALS QUZHOU CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to increase the energy density of lithium-ion batteries, a common measure is to increase the charge cut-off voltage of the positive electrode material, such as LCO-4.4V, LCO-4.45V and LCO-4.5V, but high voltage will lead to excessive extraction of cobalt atoms in the positive electrode material. This leads to the collapse and damage of the positive electrode material structure; secondly, under high voltage, the activity of the positive electrode material increases, which accelerates the oxidation and decomposition of the electrolyte behind the positive electrode material, which leads to poor cycle performance of the battery, gas expansion of the battery, and affects the service life and safety performance
[0004] As mentioned in some patent documents about high-voltage lithium-ion battery electrolytes such as CN102683749A, the common method to solve the above problems is to introduce fluorine-containing carbonates as solvents, but this type of material has a high viscosity, which is unfavorable for the dissolution of lithium salts and is easy to Lead to low conductivity and high viscosity of lithium-ion battery electrolyte

Method used

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  • A kind of lithium-ion battery non-aqueous electrolyte and lithium-ion battery
  • A kind of lithium-ion battery non-aqueous electrolyte and lithium-ion battery
  • A kind of lithium-ion battery non-aqueous electrolyte and lithium-ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Electrolyte preparation steps: In a glove box filled with argon, ethylene carbonate, propylene carbonate, diethyl carbonate and ethyl acetate are prepared according to the mass ratio of EC:PC:DEC:PP=25:15:40:20 Mix, then slowly add 14.0wt% lithium hexafluorophosphate to the mixed solution, finally add 5.0wt% fluoroethylene carbonate based on the total weight of the electrolyte, and 4.0wt% 1,3-propane sultone based on the total weight of the electrolyte , 2.5wt% adiponitrile based on the total weight of the electrolyte, 2.5wt% 1,2-bis(2-cyanoethoxy)ethane based on the total weight of the electrolyte, 1.0wt% difluorosulfone based on the total weight of the electrolyte Lithium imide was stirred evenly to obtain the lithium-ion battery electrolyte of Example 1.

[0036] The prepared lithium-ion power battery electrolyte was injected into the fully dried artificial graphite material / LC0-4.4V battery. After the battery was left at 45°C, formed by high-temperature fixtures and...

Embodiment 2-7

[0047] Embodiment 2-7 and comparative example 1-4

[0048] In Examples 2-7 and Comparative Examples 1-4, except that the composition ratio of the components of the electrolyte solution is added as shown in Table 1, the others are the same as in Example 1. The proportioning ratio of the components of the electrolytes of Examples 1-7 and Comparative Examples 1-4 is shown in Table 1, and the physical properties of the electrolytes of Examples 1-7 and Comparative Examples 1-4 are shown in Table 2.

[0049] Table 3 shows the performances of the digital batteries of Examples 1-7 and Comparative Examples 1-4.

[0050] Table 1 Embodiment 1-7 and the composition ratio of each component of the electrolyte of comparative example 1-4

[0051]

[0052] Table 2 embodiment 1-7 and comparative example 1-4 electrolyte physical properties

[0053]

[0054]

[0055] Table 3 Embodiment 1-7 and comparative example 1-4 digital battery performance

[0056]

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Abstract

The invention relates to the field of lithium ion batteries and discloses lithium ion battery nonaqueous electrolyte and a lithium ion battery. The lithium ion battery nonaqueous electrolyte comprisesan electrolyte lithium salt, a nonaqueous organic solvent and a filming additive, wherein the nonaqueous organic solvent comprises cyclic carbonate, chain-shaped carbonate and a carboxylic acid estersolvent; the chain-shaped carbonate comprises a novel carbonic ester compound of a structure of formula (I). Due to adoption of the novel carbonic ester solvent of the structure of the formula (I), an electrochemical window of electrolyte can be effectively improved, and application of high-voltage system batteries can be met. Meanwhile, due to adoption of a nitrile additive, FEC gas generation can be effectively inhibited; due to adoption of cobalt for complexing an anode material, a function of improving properties of a battery is achieved; multiple novel filming lithium salts are combined,so that the high / low-temperature performance, the rate capability and the long circulation performance of a power battery can be improved.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a lithium ion battery non-aqueous electrolyte and a lithium ion battery. Background technique [0002] Lithium-ion batteries are widely used in 3C digital products, power tools, electric vehicles and other fields due to their advantages such as high working voltage, high energy density, long life, wide working temperature range and environmental friendliness. Especially in the 3C digital field, the rapid development of mobile electronic devices, especially smart phones (lighter and thinner) in recent years, has put forward higher requirements for the energy density of lithium-ion batteries. [0003] In order to increase the energy density of lithium-ion batteries, a common measure is to increase the charge cut-off voltage of the positive electrode material, such as LCO-4.4V, LCO-4.45V and LCO-4.5V, but high voltage will lead to excessive extraction of cobalt atoms in the posi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0569H01M10/0525
CPCH01M10/0525H01M10/0569H01M2300/0037H01M2300/004Y02E60/10
Inventor 潘立宁王建斌郭力刘津宏黄慧聪
Owner SHANSHAN ADVANCED MATERIALS QUZHOU CO LTD
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