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Dual-ion battery and preparation method thereof

A dual-ion, battery technology, applied in the manufacture of electrolyte batteries, secondary batteries, battery electrodes, etc., can solve the problems of unsatisfactory chemical properties, degradation of aluminum anode cycle stability, low battery capacity, etc., and achieve excellent electrochemical stability. , capacity and cycle performance improvement, the effect of high capacity

Active Publication Date: 2018-06-12
SHENZHEN INST OF ADVANCED TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The first purpose of the present invention is to provide a dual-ion battery to alleviate the cycle stability caused by the unsatisfactory electrochemical performance of the existing dual-ion battery, low battery capacity and severe volume expansion or pulverization of the aluminum negative electrode during charging and discharging. Attenuation Technical Issues

Method used

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  • Dual-ion battery and preparation method thereof
  • Dual-ion battery and preparation method thereof
  • Dual-ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0105] As a preferred embodiment, the preparation method of dual-ion battery comprises the following steps:

[0106] a) Prepare the negative electrode: mix the active material of the negative electrode material, the conductive agent, the binder and the solvent to make a slurry; then coat the negative electrode material slurry on the surface of the negative electrode current collector, and cut it into pieces after drying to obtain the negative electrode of the required size ;

[0107] b) preparing electrolyte: dissolving lithium salt electrolyte in organic solvent and / or ionic liquid, stirring fully to obtain electrolyte;

[0108] c) Prepare the diaphragm: cut the diaphragm into the required size for later use;

[0109] d) Preparation of the positive electrode: mix the active material of the positive electrode material, the conductive agent, the binder and the solvent to form a slurry; then coat the positive electrode material slurry on the surface of the positive electrode cu...

Embodiment 1

[0116] This embodiment is a lithium double-ion battery, including a negative electrode, a separator, an electrolyte, and a positive electrode. Wherein, the specific material composition and preparation method of the dual-ion battery are as follows:

[0117] Step a) Prepare the negative electrode: add 0.7g of organic material pyrazine-quinoxaline copolymer, 0.2g of carbon nanotubes, and 0.1g of polytetrafluoroethylene into 2ml of nitrogen-methylpyrrolidone solution, grind thoroughly to obtain a uniform slurry; then The slurry was evenly coated on the surface of the copper foil (ie, the negative current collector) and dried in vacuum. Cut the electrode sheets obtained by drying into discs with a diameter of 12mm, and use them as positive electrodes after compaction;

[0118] Step b) preparing the diaphragm: cutting the glass fiber film into discs with a diameter of 16 mm as a diaphragm for subsequent use;

[0119] Step c) Preparation of electrolyte: Weigh 1.52g of lithium hexa...

Embodiment 2-11

[0123] Examples 2-11 are a lithium double-ion battery, the difference from Example 1 is that the positive electrode active material used is different, and the rest are the same as Example 1. At the same time, performance tests were performed on the dual-ion batteries provided in Examples 1-11, and the specific material compositions and test results are listed in Table 1.

[0124] Battery performance tests include energy density and specific capacity tests, and the specific test methods are as follows:

[0125] Cycle charge and discharge: Cycle charge and discharge are carried out on the CT2001C-001 blue electric battery cycle test system, and the standard capacity of the electrode is tested by charging and discharging at a rate of 100mAh / g. The specific capacity of the material = current * time / sample mass, the energy density of the material = specific capacity of the material * plateau voltage of the battery.

[0126] The performance test result of the double-ion battery o...

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Abstract

The invention provides a dual-ion battery and a preparation method thereof, and relates to the field of batteries. The dual-ion battery comprises a positive electrode, a negative electrode, a diaphragm and electrolyte, wherein the diaphragm and the electrolyte are arranged between the positive electrode and the negative electrode. The negative electrode comprises negative electrode active materials which are organic materials capable of performing reversible reaction with positive ions in the electrolyte. The dual-ion battery can solve the technical problems of non-ideal electrochemical performance and low capacity of existing dual-ion batteries as well as cyclic stability attenuation caused by serious volume expansion or pulverization of aluminum negative electrodes in charging and discharging processes. The dual-ion battery is excellent in electrochemical performance, high in capacity and stable in cyclic performance.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a dual-ion battery and a preparation method thereof. Background technique [0002] The existing aluminum-graphite dual-ion battery (Advanced Energy Materials, 2016, 6(11): 1502588) is widely used as an electric energy storage device in various industries. Taking aluminum-graphite double-ion lithium battery as an example, its working principle is mainly that lithium ions shuttle back and forth during charging and discharging, and rely on redox reactions to store energy. During the charging process, lithium ions in the electrolyte intercalate into the aluminum negative electrode to form an aluminum-lithium alloy; during the discharge process, lithium ions come out of the aluminum negative electrode and enter the electrolyte to complete the entire discharge process. [0003] However, the cycle stability of the existing aluminum-graphite dual-ion battery needs to be improved, espe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M4/60H01M10/058
CPCH01M4/60H01M10/0525H01M10/058H01M2300/0025Y02E60/10Y02P70/50
Inventor 唐永炳吴越张苗
Owner SHENZHEN INST OF ADVANCED TECH
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