Durable and environment-friendly lithium battery

A lithium battery, environmentally friendly technology, applied in the direction of secondary batteries, battery components, secondary battery repair/maintenance, etc., can solve the problems of poor wettability of diaphragm materials, inability to absorb electrolyte, unfavorable battery applications, etc. Achieve the effects of avoiding electrolyte leakage, reducing the total amount of use, good liquid absorption and retention

Inactive Publication Date: 2018-11-13
徐州光森电器工具有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to improve battery performance, there have been many studies on diaphragm modification. However, these diaphragm materials have poor wettability and cannot absorb electrolyte, resulting in electrolyte leakage and polluting the environment, which is not conducive to application in batteries and Further application in industry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] The preparation method of diaphragm comprises the steps:

[0012] (1) Prepare a beaker, mix 20g polyoxyethylene and 100g acetonitrile solution in the beaker;

[0013] (2) adding 40wt% nano-silica, heating and stirring at 80° C. for 7 hours until a uniform solution is formed;

[0014] (3) Transfer the mixed solution to a vacuum environment, soak the basement membrane in this solution for 2 hours, take it out and dry it in a vacuum drying oven for 10 hours,

[0015] (4) After the acetonitrile is completely volatilized, a diaphragm is formed.

[0016] Immerse the above separator in 0.5mol / L LiPF 6 / EC:DEC=1:1 Electrolyte solution for 1h, picked up with tweezers, blotted the droplet with filter paper, sandwiched between two stainless steel electrodes, and measured conductivity by electrochemical workstation by AC impedance method.

[0017] The lithium sheet is used as the negative electrode, and the positive electrode material is LiNi 0.8 co 0.2 o 2 , Assemble the bat...

Embodiment 2

[0020] The preparation method of diaphragm comprises the steps:

[0021] (1) Prepare a beaker, mix 20g polyoxyethylene and 90g acetonitrile solution in the beaker;

[0022] (2) adding 25wt% nano-silica, heating and stirring at 120° C. for 9 hours until a uniform solution is formed;

[0023] (3) Transfer the mixed solution to a vacuum environment, soak the basement membrane in this solution for 5 hours, take it out and dry it in a vacuum drying oven for 20 hours,

[0024] (4) After the acetonitrile is completely volatilized, a diaphragm is formed.

[0025] Immerse the above separator in 0.5mol / L LiPF 6 / EC:DEC=1:1 Electrolyte solution for 1h, picked up with tweezers, blotted the droplet with filter paper, sandwiched between two stainless steel electrodes, and measured conductivity by electrochemical workstation by AC impedance method.

[0026] The lithium sheet is used as the negative electrode, and the positive electrode material is LiNi 0.8 co 0.2 o 2 , Assemble the bat...

Embodiment 3

[0029] A preparation method for a separator for a lithium battery, comprising the steps of:

[0030] (1) Prepare a beaker, mix 25g polyoxyethylene and 100g acetonitrile solution in the beaker;

[0031] (2) adding 40wt% nano-silica, heating and stirring at 100° C. for 9 hours until a uniform solution is formed;

[0032] (3) Transfer the mixed solution to a vacuum environment, soak the basement membrane in this solution for 4 hours, take it out and dry it in a vacuum drying oven for 15 hours,

[0033] (4) After the acetonitrile is completely volatilized, a diaphragm is formed.

[0034] Immerse the above separator in 0.5mol / L LiPF 6 / EC:DEC=1:1 Electrolyte solution for 1h, picked up with tweezers, blotted the droplet with filter paper, sandwiched between two stainless steel electrodes, and measured conductivity by electrochemical workstation by AC impedance method.

[0035] The lithium sheet is used as the negative electrode, and the positive electrode material is LiNi 0.8 co...

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PUM

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Abstract

The invention discloses a durable and environment-friendly lithium battery, comprising a positive electrode, a negative electrode and a diaphragm, wherein the negative electrode is a lithium plate, the positive electrode is Li10Ni8Co2O20, and the separator is prepared by combining the following raw material components: 20-25g of polyoxyethylene, 90-100g of an acetonitrile solution, and 25wt%-40wt%of nano silica. The electrolyte uptake rate of the diaphragm used in the battery is improved by one time or more than that of an unmodified diaphragm, so as to prevent electrolyte immersing a composite membrane from being lost, so that the diaphragm exhibits good liquid absorption and retention, which not only reduces the total amount of the electrolyte used, but also greatly reduces the possibility of reaction between a lithium electrode and the electrolyte, thereby technically avoiding electrolyte leakage, environmental pollution and other problems, and obtaining a new generation of green battery through further optimization. The conductivity of the diaphragm is improved, and the battery loses only 5% of electricity after 20 times of charging, indicating that the charging cycle performance is significantly improved.

Description

technical field [0001] The invention relates to a durable and environment-friendly lithium battery, which belongs to the field of storage batteries. Background technique [0002] Lithium batteries are composed of positive and negative electrodes and a separator. The separator itself is not only a poor conductor of electrons, but also allows electrolyte ions to pass through. Usually, separator materials must have good chemical and electrochemical stability and mechanical properties, and maintain high wettability to the electrolyte during repeated charge and discharge. The interfacial compatibility between the separator material and the electrode, and the retention of the electrolyte by the separator have a great influence on the charge-discharge performance and cycle performance of the lithium-ion battery. In order to improve battery performance, there have been many studies on diaphragm modification. However, these diaphragm materials have poor wettability and cannot absorb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M10/0525H01M10/42
CPCH01M10/0525H01M10/4235H01M50/446Y02E60/10
Inventor 刘金保
Owner 徐州光森电器工具有限公司
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