Electrochemical device and electronic device including same

An electrochemical and content-based technology, applied in the field of energy storage, can solve problems such as the inability to take into account the electrochemical performance of electrochemical devices

Active Publication Date: 2020-06-26
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, while the existing technology is committed to ensuring the normal use of electrochemical devices in low temperature environments, it is unable to take into account the electrochemical performance of electrochemical devices in high temperature environments

Method used

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  • Electrochemical device and electronic device including same
  • Electrochemical device and electronic device including same
  • Electrochemical device and electronic device including same

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment

[0100] The preparation method and performance test method of the lithium-ion battery in the examples and comparative examples of the present application are described below.

[0101] (1) Preparation of lithium-ion batteries

[0102] (1) Preparation of electrolyte: In an argon atmosphere glove box with a water content 6 Dissolved in the above non-aqueous solvents, where LiPF 6 The content of 1mol / L, to obtain the basic electrolyte. Finally, as shown in the following Tables 1-8, a certain mass of additives was added to the basic electrolyte to prepare the electrolyte in the embodiment.

[0103] (2) Preparation of positive electrode: the positive electrode active material lithium cobaltate (LiCoO 2 ), the conductive agent acetylene black, and the binder polyvinylidene fluoride (PVDF) are fully stirred and mixed in an appropriate amount of N-methylpyrrolidone (NMP) solvent in a weight ratio of 96:2:2 to form a uniform positive electrode slurry Then, the positive electrode slurr...

Embodiment 1-19 and comparative example 1

[0124] The electrolytes and lithium-ion batteries of Examples 1-19 and Comparative Example 1 were prepared according to the above-mentioned preparation method, wherein Comparative Example 1 used the basic electrolyte, and Examples 1-19 were respectively added to the basic electrolyte as shown in Table 1. The components and contents are shown, wherein the content is the mass percentage of the component based on the total weight of the electrolyte, wherein the substances of formulas I-2, I-3, I-4, and I-7 are added in the form of lithium salts. In addition, Table 1 also shows the electrochemical test results of the lithium-ion batteries in Examples 1-19 and Comparative Example 1.

[0125] Table 1

[0126]

[0127]

[0128] Referring to the electrochemical test results in Table 1, it can be seen that compared with Comparative Example 1, the electrolyte in Examples 1-19 of the present application has a certain content of the anion of formula I described in the present applic...

Embodiment 5 and Embodiment 20-26

[0132] Embodiments 20-26 are improvements made on the basis of Embodiment 5. Specifically, in Examples 20-26, fluorocarbonate is further added to the electrolyte described in Example 5, wherein the specific components and contents added and the performance test results of the obtained lithium-ion battery are shown in the following table 2.

[0133] Table 2

[0134]

[0135] Referring to the electrochemical test results in Table 2, it can be seen that, compared with Example 5, the electrolytic solution in Examples 20-26 of the present application has a certain content of fluorocarbonate, and the corresponding electrochemical device obtained at a low temperature Both the discharge performance at low temperature and the cycle stability at room temperature have been improved to a certain extent. This is because the anion represented by formula I and the fluorocarbonate work together to make the electrolyte have a high reduction potential, which can form an SEI film on the sur...

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Abstract

The invention relates to an electrochemical device. The electrochemical device of the present application includes a positive electrode, a negative electrode, and an electrolyte solution, wherein theelectrolyte solution includes anions having a phosphoric anhydride functional group of a specific structure. By adding the anions into the electrolyte solution, the low-temperature discharge performance and the high-temperature storage performance of the electrochemical device can be improved and achieved at the same time, and the cycling stability of the electrochemical device at normal temperature and high temperature is improved.

Description

technical field [0001] The present application relates to the technical field of energy storage, and more specifically, to an electrochemical device and an electronic device including the same. Background technique [0002] With the popularization and application of smart products, people's demand for electronic products such as mobile phones, laptops, and cameras is increasing year by year, and electrochemical devices, as power sources for electronic products, play an increasingly important role in our daily life. Among them, lithium-ion batteries are widely used in the field of consumer electronics due to their advantages such as large specific energy, high working voltage, low self-discharge rate, small size, and light weight. [0003] However, with the widespread application of electrochemical devices in electric vehicles, mobile electronic devices and unmanned aerial vehicles, people not only require electrochemical devices to work normally at room temperature, but also...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M4/62H01M10/0525H01M10/058H01M10/42
CPCH01M10/0567H01M4/626H01M10/0525H01M10/058H01M10/4235Y02E60/10Y02P70/50
Inventor 栗文强管明明郑建明郑湘岭
Owner NINGDE AMPEREX TECH
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