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Composite electrolyte, electrochemical device and electronic device using same

A technology of composite electrolyte and solid electrolyte, which is applied in the field of electrochemical devices and electronic devices, and can solve problems such as hindering practical applications, low conductivity, and poor bonding

Active Publication Date: 2021-01-19
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The electrolyte used in traditional lithium-ion batteries is flammable. Therefore, the use of high-safety solid-state electrolytes as electrolyte substitutes has become one of the research directions.
A single inorganic solid-state electrolyte has high conductivity, but its inherent rigidity leads to poor bonding between it and the electrode pad, and large interface impedance, which seriously hinders its application.
A single organic solid electrolyte has certain flexibility and can be well adhered to the electrode sheet, but its conductivity is low (for example, the conductivity of PEO at room temperature is only 10 -6 S / cm), thus hindering its practical application

Method used

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  • Composite electrolyte, electrochemical device and electronic device using same
  • Composite electrolyte, electrochemical device and electronic device using same
  • Composite electrolyte, electrochemical device and electronic device using same

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0112] The positive electrode can be prepared by a preparation method known in the art. For example, the positive electrode may be obtained by mixing an active material, a conductive material, and a binder in a solvent to prepare an active material composition, and coating the active material composition on a current collector. In some embodiments, the solvent may include N-methylpyrrolidone and the like, but is not limited thereto.

[0113] 3. Electronic devices

[0114] The application of the electrochemical device of the present application is not particularly limited, and it can be used in any electronic device known in the prior art. In one embodiment, the electrochemical device of the present application can be used in, but not limited to, notebook computers, pen-based computers, mobile computers, e-book players, portable phones, portable fax machines, portable copiers, portable printers, head-mounted Stereo headphones, VCRs, LCD TVs, portable cleaners, portable CD pla...

Embodiment

[0117] The following describes the performance evaluation of the composite electrolytes and the lithium-ion batteries prepared therefrom according to the examples and comparative examples of the present application.

[0118] 1. Preparation of lithium-ion battery (button battery)

[0119] 1. Preparation of negative electrode

[0120] Lithium metal or lithium alloy is used as the negative electrode.

[0121] 2. Preparation of positive electrode

[0122] The cathode active material (LiFePO 4 Or lithium cobaltate (LCO)), conductive carbon black and polyvinylidene fluoride (PVDF) are mixed according to the mass ratio of 80%: 10%: 10%, add N-methylpyrrolidone (NMP) as a solvent, stir evenly, A positive electrode slurry with a solid content of 0.75 wt% was obtained. The prepared positive electrode slurry was coated on an aluminum foil of a positive electrode current collector, and dried at 110° C. to obtain a positive electrode. In the obtained positive electrode, the coating we...

Embodiment 27

[0150] Example 27 was similar to Example 8, but contained a polyimide porous matrix with a porosity of 70% and a thickness of 16 microns. Embodiment 28 adds 2% VC on the basis of embodiment 27. Embodiment 29 adds 5% TMP on the basis of embodiment 28. The lithium ion battery that will be made by the composite electrolyte of the present application carries out flammability test (as Figure 5 shown). The results show that the lithium-ion batteries prepared by the composite electrolyte of the present application have no burning phenomenon and have high safety.

[0151] Table 4 demonstrates the properties of Examples 27-29.

[0152] Table 4

[0153]

[0154] Using the composite electrolyte of Example 8 shown in Table 1 and using LiFePO 4 Lithium-ion batteries are prepared as positive electrode active materials. The first-cycle discharge specific capacity of the prepared lithium-ion batteries was tested at room temperature and 4 °C. As shown in Table 5, the composite elect...

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Abstract

The invention relates to a composite electrolyte and an electrochemical device using the composite electrolyte and an electronic device, and particularly provides a composite electrolyte comprising aninorganic solid electrolyte; an organic solid electrolyte; an organic additive; and a lithium salt, wherein the organic additive has a boiling point within the range of 150-350 DEG C, and the contentof the lithium salt is within the range of about 12wt%-50wt% based on the total weight of the composite electrolyte. The composite electrolyte has good conductivity. The lithium ion battery preparedby the composite electrolyte can realize operation at room temperature and low temperature and has low battery impedance and high battery capacity.

Description

technical field [0001] The application relates to the field of energy storage, in particular to composite electrolytes and electrochemical devices and electronic devices using the same. Background technique [0002] With the widespread application of electronic devices such as cameras, digital video cameras, mobile phones, and notebook computers, the performance requirements of electrochemical devices (eg, lithium-ion batteries) are getting higher and higher. Lithium-ion batteries have the advantages of high energy density, long cycle life, and no memory effect, and have been widely used in various fields. The electrolyte used in traditional lithium-ion batteries is flammable. Therefore, the use of high-safety solid-state electrolytes as electrolyte substitutes has become one of the research directions. A single inorganic solid-state electrolyte has high electrical conductivity, but its inherent rigidity leads to poor adhesion between it and the electrode sheet, and large i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0562H01M10/0565H01M10/0525
CPCH01M10/0525H01M10/0562H01M10/0565H01M2300/0065H01M2300/0082H01M2300/0088Y02E60/10
Inventor 盖建丽郑建明刘建禹王荣
Owner NINGDE AMPEREX TECH
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