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Non-aqueous electrolyte additive, non-aqueous electrolyte and lithium-ion battery

A non-aqueous electrolyte and lithium-ion battery technology, applied in secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve problems such as large battery impedance, decreased electrochemical performance, and SEI film damage, and achieve high The effect of stable voltage performance and film formation structure

Active Publication Date: 2022-04-26
DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to solve the problem of lithium-ion batteries with ternary materials as positive electrodes and silicon-carbon materials as negative electrodes, during the high-voltage charge-discharge cycle, the electrolyte solution continuously oxidizes and decomposes on the surface of the ternary materials, causing the dissolution of nickel, cobalt, manganese and the destruction of the SEI film of the negative electrode. , and the volume effect in the process of charging and discharging the silicon carbon negative electrode leads to damage and shedding of the SEI film, resulting in at least one of the problems of large battery impedance and decreased electrochemical performance. The invention provides a new type of non-aqueous electrolyte additive and contains its non-aqueous electrolyte

Method used

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  • Non-aqueous electrolyte additive, non-aqueous electrolyte and lithium-ion battery
  • Non-aqueous electrolyte additive, non-aqueous electrolyte and lithium-ion battery
  • Non-aqueous electrolyte additive, non-aqueous electrolyte and lithium-ion battery

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Embodiment approach

[0049] According to some embodiments provided by the present invention, the compound of formula (I) is a compound having one of the following structures:

[0050]

[0051] The above-mentioned compound of formula (I) can oxidize and polymerize to form a film on the surface of the NCM positive electrode material, react with the hydroxyl groups on the surface of the SiC negative electrode material, and undergo reductive polymerization and crosslinking to form an SEI film with certain mechanical strength and toughness on the surface of the silicon carbon negative electrode. Thereby improving the high-voltage performance of NCM-SiC lithium-ion batteries.

[0052] According to some embodiments provided by the present invention, the amount of the compound of formula (I) added is 0.1% to 2.0%, such as 0.1%, 0.2%, 0.3%, based on the sum of the mass of the solvent and the electrolyte lithium salt as 100%. , 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1.0%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%,...

Embodiment 1

[0091] In this embodiment, the provided electrolyte includes fluoroethylene carbonate (FEC), ethylene carbonate (EC), ethyl methyl carbonate (EMC), diethyl carbonate (DEC) mixed solvent, and the lithium salt is LiPF 6 , additive compound (12).

[0092] The preparation method of the electrolyte is: in a glove box with a moisture content of less than 10ppm, mix the solvent evenly according to the mass fraction EC:FEC:EMC:DEC=2:1:4:3, dry to remove water and impurities, and add refined Electrolyte lithium salt LiPF 6 Prepare a solution with a lithium salt concentration of 1.2 mol / L, fully stir and mix evenly, then add 1.0% of compound (12) based on the sum of the mass of the solvent and lithium salt as 100%, and fully stir and mix uniformly to obtain an electrolytic solution liquid.

Embodiment 2

[0094] The difference from Example 1 is that the sum of the mass of solvent and lithium salt is 100%, and the addition amount of compound (12) is 0.5%; the rest are the same as Example 1.

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Abstract

The invention provides a novel cyclic phosphate additive, a nonaqueous electrolytic solution containing the same and a lithium ion battery. The additive is a compound represented by formula (I), wherein X is C or S, R is C 1‑4 Alkyl or C 1‑4 alkoxy. The non-aqueous electrolyte containing the compound represented by formula (I) as an additive can improve the high-voltage performance of the battery, and is especially suitable for lithium-ion batteries in which the ternary material is the positive electrode and the silicon-carbon material is the negative electrode.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a novel cyclic phosphate additive, a non-aqueous electrode solution containing the same and a lithium-ion battery, especially a lithium-ion battery with a ternary material as the positive electrode and a silicon-carbon material as the negative electrode. Background technique [0002] At present, electronic digital products such as smartphones and tablet computers have higher and higher energy density requirements for batteries, making it difficult for commercial lithium-ion batteries to meet the requirements. There are two ways to increase the energy density of the battery: 1. Select high-capacity and high-pressure positive and negative electrode materials; 2. Increase the working voltage of the battery. [0003] However, in high-voltage batteries, when the charging voltage of the positive electrode material increases, the oxidative decomposition of the electrolyte ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0567H01M10/0525H01M10/4235Y02E60/10
Inventor 余意何凤荣
Owner DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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