Carbamate compound for non-aqueous electrolyte and application thereof

A non-aqueous electrolyte, urethane technology, applied in electrochemical generators, circuits, organic chemistry, etc., to achieve strong metal coordination ability, improve oxidation resistance, enhance the effect of dissociation ability

Active Publication Date: 2022-06-10
HUZHOU TEACHERS COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Secondly, electrolytes containing carboxylate esters of the same molecular weight have significantly improved low-temperature performance (the viscosity can still be kept small at low temperatures), but the high-temperature stability is poor
In 2014, patent CN 105811003 B disclosed a low-temperature electrolyte based on 50% to 70% chain carboxylate, but its high-temperature performance is not ideal
It is the shortage of carboxylate that limits its use as a solvent in high-voltage lithium-ion batteries

Method used

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  • Carbamate compound for non-aqueous electrolyte and application thereof
  • Carbamate compound for non-aqueous electrolyte and application thereof
  • Carbamate compound for non-aqueous electrolyte and application thereof

Examples

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specific Embodiment

[0041] 2C (or 3C) discharge capacity ratio (%) = 2C (or 3C) discharge capacity / 0.5C discharge capacity of the same battery × 100% (2) Battery cycle performance test at room temperature (1A) Constant current-constant voltage charge to 4.5V, put it on hold for 10min, discharge at a constant current of 0.5C (1A) to a cut-off voltage of 3.0V, cycle 200 times, and record the discharge capacity each time.

[0042] Capacity retention after 200 cycles (%) = 200th discharge capacity / 2nd discharge capacity × 100%

[0043] The detailed battery performance of the battery is shown in Table 4 below.

[0044] Table 4: Different electrolytes and corresponding battery performance

[0045] By comparing Example 2 and Comparative Examples 3 and 4, it can be found that the introduction of amino groups into the structure of carbamate can indeed increase the stability of molecules during high-voltage cycling by expanding conjugation and avoiding α-H and other theories. , thereby improving the ...

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Abstract

The invention relates to the field of lithium batteries, and discloses a carbamate compound for a non-aqueous electrolyte and application of the carbamate compound. The carbamate compound according to the present invention has the following advantages: (i) excellent electrochemical stability, which is not oxidized even at a high voltage; (ii) the conductivity of the electrolyte can be improved, the affinity of molecules to the metal oxide positive electrode material can be enhanced, and the infiltration efficiency of the electrolyte can be further improved; (iii) the contact angle of molecules on the surface of a positive electrode or a negative electrode is reduced, and the wetting effect is improved.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a carbamate compound for a non-aqueous electrolyte and an application thereof. Background technique [0002] As an energy conversion and storage device, lithium-ion secondary batteries have the advantages of high mass and volume energy density, high power density, many charge and discharge times, low self-discharge rate and low environmental pollution. The main power supply of electronic products. As consumers demand more and more power from their devices, so do the demands on the energy density and cost of lithium-ion batteries. Generally, in the industrial field, methods to increase the energy density of lithium-ion batteries mainly include increasing the capacity produced per unit mass of the active material, increasing the proportion of the active material in the electrode, increasing the coating amount of the active material on the electrode unit area, and increasing the ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C271/16H01M10/0525H01M10/0569
CPCC07C271/16H01M10/0569H01M10/0525Y02E60/10
Inventor 臧旭峰夏会玲邹影吴培榕
Owner HUZHOU TEACHERS COLLEGE
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