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Electrolyte and battery

An electrolyte and additive technology, applied in the field of lithium-ion batteries, can solve the problems of deteriorating the electrochemical performance of lithium batteries, increasing the acidity value and chromaticity value of the electrolyte, and failing to achieve the effect of DTD, etc.

Active Publication Date: 2021-06-29
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, DTD has poor stability at room temperature, which often causes a sharp increase in the acidity value and chromaticity value of the electrolyte, thus failing to achieve the effect of DTD and deteriorating the electrochemical performance of lithium batteries.

Method used

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  • Electrolyte and battery
  • Electrolyte and battery
  • Electrolyte and battery

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preparation example Construction

[0026] The preparation method of the present invention will be further described in detail in conjunction with specific examples below. It should be understood that the following examples are only for illustrating and explaining the present invention, and should not be construed as limiting the protection scope of the present invention. All technologies realized based on the above contents of the present invention are covered within the scope of protection intended by the present invention.

[0027] The experimental methods used in the following examples are conventional methods unless otherwise specified; the reagents and materials used in the following examples can be obtained from commercial sources unless otherwise specified.

[0028] Both reactant (II) and reactant (III) in the examples of the present invention were purchased from Shengtai Chemical Co., Ltd.

Embodiment 1

[0030] Embodiment 1 proposes an electrolyte solution and a battery.

[0031] (1) Additives and their preparation methods

[0032] Using formula 1, the reactant (II) and the reactant (III) are mixed according to the mass ratio of about 1:1 at a temperature of 45°C and a pH of 9.0 for about 50 minutes to obtain the additive (I), such as Formula (1) shown. And carry out mass spectrometry analysis to additive (Ι), as figure 1 As shown, its main peak is at 91, showing the structural characteristics of SO2-CN, and simultaneously, its peak at 203 corresponds to the molecular characteristics of additive (I).

[0033]

[0034] (2) Electrolyte

[0035] A mixed solvent of ethylene carbonate and diethyl carbonate with a mass ratio of 3:7 was used, and LiPF was added 6 And stir fully to obtain the reference electrolyte. Among them, electrolyte-based mass meter, LiPF 6 The mass fraction is 12%. Then add the additive (I) with a mass fraction of 0.01% and vinyl sulfate (DTD) with a ...

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Abstract

The present invention relates to an electrolyte and a battery. The electrolyte includes vinyl sulfate and an additive, and the additive has a structure of formula (1). The electrolytic solution of the present invention, by adding the additive (1) and vinyl sulfate, significantly improves the thermal stability of the electrolytic solution, and suppresses the rise of the electrolytic solution acidity value and chromaticity value. In addition, the additive (1) can complex the transition metal ions dissolved from the positive electrode under charge-discharge cycles or under high pressure, thereby avoiding the damage of the transition metal ions to the negative electrode, so that the electrolyte of the present invention can significantly improve the cycle, storage and floating of the battery. charging performance. At the same time, the electrolyte of the present invention greatly improves the discharge capacity of the battery at low temperature.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to an electrolyte and a battery. Background technique [0002] Batteries (such as lithium-ion batteries) have high specific energy, excellent cycle performance, and high operating voltage, so they are widely used in the fields of digital, energy storage, power, military aerospace, and communication equipment. At present, in order to broaden the working range of the battery, vinyl sulfate (DTD) is favored by researchers as an electrolyte additive, which can significantly reduce the battery impedance and improve low-temperature performance and excellent high-temperature performance. However, DTD has poor stability at room temperature, which often causes a sharp increase in the acidity and chromaticity of the electrolyte, thus failing to achieve the effect of DTD and deteriorating the electrochemical performance of lithium batteries. [0003] Therefore, under...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M2300/0025Y02E60/10
Inventor 廖波李素丽王海徐延铭李俊义
Owner ZHUHAI COSMX BATTERY CO LTD