Method for preparing gel diaphragm cell by in-situ polymerization and prepared battery

A diaphragm battery and in-situ polymerization technology, applied in secondary batteries, battery pack components, circuits, etc., can solve the problems of poor lyophilicity of the diaphragm, poor electrode contact, and high crystallinity of polymer molecules, so as to avoid the danger of liquid leakage situation, reduce energy attenuation, and reduce performance differences

Active Publication Date: 2013-08-21
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The separator made of polypropylene or polyethylene matrix material is not conducive to the infiltration of the electrolyte solution due to the high crystallinity and low polarity of the polymer molecule, and the separator has poor lyophilicity and poor contact with the electrode.
At the same time, for polyolefin difficult-to-stick materials, it is not conducive to the bond

Method used

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  • Method for preparing gel diaphragm cell by in-situ polymerization and prepared battery
  • Method for preparing gel diaphragm cell by in-situ polymerization and prepared battery
  • Method for preparing gel diaphragm cell by in-situ polymerization and prepared battery

Examples

Experimental program
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Example Embodiment

[0024] Example 1

[0025] The lithium hexafluorophosphate electrolyte is dissolved in a 1:1 mass ratio of ethylene carbonate (EC) and diethyl carbonate (DEC) mixed organic solvent, and a conventional process is used to prepare an electrolyte with a concentration of 1 mol / L. Add 10% vinyl chloride monomer and 1% azobisisobutyronitrile (AIBN) initiator in the electrolyte. From the moment the electrolyte is prepared, the basic physical properties of the electrolyte are tested every 10 days at room temperature, and the basic physical properties of the electrolyte are tested at 45°C for 6 hours and then continuously treated at 75°C for 4 hours. A high temperature gel test is performed to determine whether the initiator and monomer are Inactivated. During storage, ensure that the electrolyte is well sealed and protected from light, and record the temperature and humidity of the environment in detail to obtain the storage stability of the electrolyte under specific conditions. The mea...

Example Embodiment

[0028] Example 2

[0029] The polymer lithium electrolyte described in Example 1 and the commercial lithium cobalt oxide positive electrode, graphite negative electrode, and polyethylene diaphragm are assembled into a liquid electrolyte battery, and the in-situ polymerization technology is used to gel the electrolyte and the diaphragm. Design the gel battery, the specific in-situ polymerization process is as follows figure 1 Shown. The wound battery is used, the capacity of the pole piece is about 2.4Ah, 11g of electrolyte is injected, and it is left under vacuum for 15 minutes at room temperature. After sealing, the battery was allowed to stand at room temperature for 56 hours, hot-pressed at a temperature of 30°C and a pressure of 0.4 MPa for 2 minutes, and then cold-pressed at 20°C for 2 minutes at the same pressure. The battery is precharged with a constant current of 0.03C and the precharge time is 200min. After a pre-charge is completed, let it stand for 35 hours at room ...

Example Embodiment

[0030] Example 3

[0031] The design process of the gel membrane battery made by in-situ polymerization technology is as described in Example 2. The produced gel battery is charged at a constant current of 0.5C to 4.2V at a voltage range of 3.0~4.2V at 55°C, continues to charge at a constant voltage of 4.2V to 0.02C, and then discharges at a constant current of 0.5C to 3.0V for cycling Performance test, the results are as image 3 As shown, after 200 charge-discharge cycles, the capacity retention rate is above 95%, indicating the good cycle stability of the gel battery. At 25℃, the voltage range is between 3.0V and 4.2V, and it is charged to 4.2V at a constant current of 0.5C, and the constant voltage is charged to 0.02C at 4.2V, and its discharge rate is obtained by discharging at a constant current of 0.1C, 0.5C, 1C Performance graph, such as Figure 4 Shown. The capacity retention rate of discharge under 1C rate is greater than 96%, indicating the good rate characteristics ...

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Abstract

The invention discloses a method for preparing a gel diaphragm cell by in-situ polymerization and a prepared battery. The method comprises the following steps of: adding a special initiator and a monomer, which are needed for a polymerization reaction, into an organic solvent electrolyte for dissolving lithium salts to prepare a polymer electrolyte; and then manufacturing a gel cell. According to the conditions of the polymerization reaction of the polymer electrolyte, due to a designed polymerization process technology, the polymer electrolyte and a polymer diaphragm gradually form a gel diaphragm in the gel battery so as to manufacture the cell with good diaphragm gel effect, good interface effect of an electrolyte electrode and consistent electric performance.

Description

technical field [0001] The invention provides a method for preparing a gel diaphragm battery by in-situ polymerization and the prepared battery, which belong to the technical field of preparation of gel battery diaphragms. Background technique [0002] The battery separator is located between the positive and negative electrodes of the battery. It is a very critical part of the battery and has a direct impact on battery safety and cost. The main function of the separator is to isolate the positive and negative electrodes and prevent the electrons in the battery from freely passing through, but it can allow the ions in the electrolyte to pass freely between the positive and negative electrodes. The ion conductivity of the battery separator will be directly related to the overall performance of the battery. Its function of isolating the positive and negative electrodes can limit the rise of the current when the battery is overcharged or the temperature rises, preventing the ba...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M10/0565C08F114/06C08F112/08
CPCY02E60/10
Inventor 纪效波宋维鑫陈启元李叙
Owner CENT SOUTH UNIV
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