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Phenyl-amide materials, their compositions and their use as electrolyte additives

An electrolyte additive and material addition technology, applied in organic electrolytes, non-aqueous electrolytes, circuits, etc., can solve the problems of lithium-ion battery performance degradation, discharge voltage and capacity reduction, battery polarization increase, etc., to improve capacity and Cycle performance, improved cycle performance, low cost effect

Active Publication Date: 2020-11-24
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Studies have revealed that one of the main reasons for the performance attenuation of lithium-ion batteries is the instability of the electrolyte / electrode interface, which causes solvent molecules to react and decompose on the electrode surface, and its decomposition products such as lithium carbonate are deposited on the electrode surface, resulting in an increase in interface impedance. increase, resulting in a decrease in discharge voltage and capacity

Method used

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  • Phenyl-amide materials, their compositions and their use as electrolyte additives
  • Phenyl-amide materials, their compositions and their use as electrolyte additives
  • Phenyl-amide materials, their compositions and their use as electrolyte additives

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] In this embodiment, the base liquid of the electrolyte is LiPF made of solvent and solute 6 A mixed solution with a concentration of 1M, in which the solvent is prepared from PC and DMC at a volume ratio of 1:1, and additive L1 is added to the base solution in this example, where the molecular structure of L1 is as follows :

[0021]

[0022] Relative to the total mass of the electrolyte, the content of L1 in the electrolyte is 8wt%. Table 1 shows the electrochemical performance test results of the lithium battery with the electrolyte added with the additive L1 of this example.

Embodiment 2

[0024] This embodiment is basically the same as Embodiment 1, especially in that:

[0025] In this embodiment, the base liquid of the electrolyte is LiPF made of solvent and solute 6 A mixed solution with a concentration of 1M, in which the solvent is prepared from two solvent components of PC and DMC at a ratio of 1:1 by volume. Additive L2 is added to the base solution in this example, and the molecular structure of L2 is as follows :

[0026]

[0027] Relative to the total mass of the electrolyte, the content of L2 in the electrolyte is 5 wt%. Table 1 shows the electrochemical performance test results of the lithium battery with the electrolyte added with the additive L2 of this example.

Embodiment 3

[0029] This embodiment is basically the same as the previous embodiment, and the special features are:

[0030] In this embodiment, the base liquid of the electrolyte is LiPF made of solvent and solute 6 A mixed solution with a concentration of 1M, in which the solvent is prepared from two solvent components of PC and DMC at a volume ratio of 1:1. Additive L3 is added to the base solution in this example, and the molecular structure of L3 is as follows :

[0031]

[0032] Relative to the total mass of the electrolyte, the content of L3 in the electrolyte is 3 wt%. Table 1 shows the electrochemical performance test results of applying the electrolyte solution added with the additive L3 of this example to the lithium battery.

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Abstract

The invention discloses a phenyl-amide material as well as a composition thereof and application thereof as an electrolyte additive. A new lithium ion battery electrolyte additive system is adopted, and the phenyl-amide material is characterized in that two ends of a molecular structure of the phenyl-amide material contain benzene or aromatic ring derivatives, and a linking group contains an amide functional group. The additive provided by the invention can simultaneously stabilize a positive electrode interface and block the dissolution-deposition behavior of transition metals so as to improve the cycling performance of batteries. The invention also discloses a lithium ion battery using the electrolyte system. The electrolyte system provided by the invention is well fits for the existing lithium ion batteries, and films, electrode materials or shells do not need to be changed, so that the electrolyte system has wide application prospect in the fields of power batteries and energy storage batteries.

Description

technical field [0001] The invention relates to a phenyl group and its derivatives and applications thereof, in particular to a phenyl group with various end groups and its derivatives and applications thereof, which are applied in the technical field of electrochemical energy storage materials. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, large output power, high average output voltage, small self-discharge, no memory effect, fast charge and discharge, excellent cycle performance, and no environmental pollution. They are secondary batteries with the most potential and commercial value. Types of batteries, widely used in mobile power, portable electronics, household appliances, power tools, public transportation, smart grid and home energy storage, etc. However, with the development of human society and the improvement of scientific and technological level, the development of various industries has put forward higher require...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C233/65C07C233/11C07C235/38C07C233/78C07C235/50C07C235/34H01M10/0567H01M10/0525
CPCC07C233/11C07C233/65C07C233/78C07C235/34C07C235/38C07C235/50H01M10/0525H01M10/0567H01M2300/0025Y02E60/10
Inventor 刘杨杨文超郭炳焜孙担担徐福忠
Owner SHANGHAI UNIV