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Electrolyte for improving high-temperature storage characteristic of battery and lithium ion battery

A lithium-ion battery and electrolyte technology, applied in the field of lithium-ion batteries, can solve problems such as the increase of interface impedance, the influence of electrolyte, and the reduction of the stability of positive electrode materials, so as to achieve the effect of improving stability and inhibiting high-temperature gas production

Pending Publication Date: 2021-12-07
ENVISION DYNAMICS TECH (JIANGSU) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, both of these solutions have an adverse effect on the electrolyte
Excessive nickel content will reduce the stability of the positive electrode material, and the unstable trivalent nickel ions will cause the electrolyte to oxidize and decompose at the positive electrode; on the other hand, increasing the battery charging voltage will increase the positive electrode potential, and the electrolyte is also prone to Oxidative decomposition process, which will cause a series of problems such as battery flatulence and interface impedance increase

Method used

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  • Electrolyte for improving high-temperature storage characteristic of battery and lithium ion battery
  • Electrolyte for improving high-temperature storage characteristic of battery and lithium ion battery
  • Electrolyte for improving high-temperature storage characteristic of battery and lithium ion battery

Examples

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Embodiment 1

[0044] This embodiment provides a preparation method of lithium-ion battery electrolyte, the preparation method comprising:

[0045] Ethylene carbonate (EC), ethyl methyl carbonate (EMC), and diethyl carbonate (DEC) were mixed into a non-aqueous organic solvent in a mass ratio of 3:5:2, and LiPF 6 Dissolved, dissolved and configured into a solution with a concentration of 1mol / L, and then mixed with 0.02wt% olefin compound shown in structural formula 2, 0.05wt% vinyl sulfate, 0.05wt% vinylene carbonate, 1wt% 1,3-propylene sulfonate Acid lactone, 0.8wt% LiPO 2 f 2 , 0.5wt% LiFSI and 0.5wt% LiODFP to obtain the electrolyte.

[0046]

Embodiment 2

[0048] This embodiment provides a preparation method of lithium-ion battery electrolyte, the preparation method comprising:

[0049] Ethylene carbonate (EC), ethyl methyl carbonate (EMC), and diethyl carbonate (DEC) were mixed into a non-aqueous organic solvent in a mass ratio of 3:5:2, and LiPF 6 Dissolve, dissolve and configure a solution with a concentration of 1mol / L, and then mix with 0.05wt% olefin compound shown in structural formula 3, 1wt% vinyl sulfate, 0.5wt% vinylene carbonate, 1wt% 1,3-propenesulfonic acid Lactone, 0.8wt% LiPO 2 f 2 , 0.5wt% LiFSI and 0.5wt% LiODFP to obtain the electrolyte.

[0050]

Embodiment 3

[0052] This embodiment provides a preparation method of lithium-ion battery electrolyte, the preparation method comprising:

[0053] Ethylene carbonate (EC), ethyl methyl carbonate (EMC), and diethyl carbonate (DEC) were mixed into a non-aqueous organic solvent in a mass ratio of 3:5:2, and LiPF 6 Dissolved, dissolved and configured into a solution with a concentration of 1mol / L, and then mixed with 15wt% olefin compound shown in structural formula 4, 5wt% vinyl sulfate, 5wt% fluoroethylene carbonate, 10wt% 1,3-propanesulfonic acid Esters, 0.8wt% LiPO 2 f 2 , 0.5wt% LiFSI and 0.5wt% LiODFP to obtain the electrolyte.

[0054]

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Abstract

The invention provides a non-aqueous electrolyte of a lithium ion battery. The non-aqueous electrolyte comprises a non-aqueous solvent, a lithium salt and an electrolyte additive, the electrolyte additive comprises an olefin compound as shown in a formula 1 as a first additive, in the formula 1, X comprises any one of a sulfur atom, a phosphorus atom, a carbon atom or a silicon atom, R1 is H or C1-C6 straight chain or branched chain alkyl, and m is 2-4. By adding the multi-olefin compound containing heteroatoms (such as sulfur and phosphorus), a stable SEI film can be formed on the positive electrode, high-temperature gas production is inhibited, the high-temperature storage stability of the lithium ion secondary battery is improved, and more ideal battery performance is obtained.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to an electrolyte for lithium-ion batteries, and in particular to an electrolyte for improving the high-temperature storage characteristics of batteries. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, high working voltage, long cycle life, and no memory effect. They are currently the main energy source for portable electronic devices, and they have also shown good performance in applications such as electric vehicles and smart Internet of Things. [0003] In order to further adapt to the ever-evolving application requirements, Li-ion batteries are required to have higher energy density. At present, there are two main schemes to increase the energy density of lithium-ion batteries: the first scheme is to use anode materials with high nickel content; the second scheme is to increase the charge cut-off voltage of lithium-ion batterie...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0567H01M10/0525H01M10/4235H01M2300/0025Y02E60/10
Inventor 王子沅王仁和余乐
Owner ENVISION DYNAMICS TECH (JIANGSU) CO LTD