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Water-borne lithium ion battery and preparation method thereof

A lithium-ion battery, water-based electrolyte technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of easy fire and explosion of batteries, low ion migration rate, inability to use water-based electrolytes, etc., and achieve high rate performance improvement , to meet the needs of high voltage, to ensure the effect of safety

Inactive Publication Date: 2018-11-13
HUNAN GRAND PRO ROBOT TECH
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Problems solved by technology

[0002] Lithium-ion batteries have the characteristics of high energy density, environmental protection, and no memory effect, and have been widely used in various industries. However, because the electrolyte of lithium-ion batteries uses organic solutions, the ion migration rate is much lower than that in water, which makes the batteries unsuitable for high-rate charging. Discharge; at the same time, using organic electrolyte, the battery is easy to catch fire and explode; but limited to the decomposition voltage of water is only 1.2V, which cannot meet the maximum requirement of 4.2V for lithium batteries, so water electrolyte cannot be used

Method used

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  • Water-borne lithium ion battery and preparation method thereof
  • Water-borne lithium ion battery and preparation method thereof

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preparation example Construction

[0022] Further, the present invention also provides a method for preparing the above-mentioned aqueous lithium-ion battery, the method comprising the following steps:

[0023] (1) Coating an organic solid electrolyte on the surface of the negative electrode, the mass ratio of the active material of the negative electrode to the organic solid electrolyte is 100:0.5~40, preferably 100:0.5~20, for example 100:0.5, 100:5 , 100:10, 100:20; use a semi-permeable membrane to completely cover and seal the negative electrode sheet;

[0024] (2) After step (1) is completed, it is wound with the positive electrode sheet, put into the shell, and injected with tris(trifluoro Methylsulfonyl) methyllithium aqueous solution to make lithium-ion batteries.

[0025] The technical solutions of the present invention will be further described in detail below in conjunction with specific embodiments. The following examples are only to illustrate and explain the present invention, but should not be ...

Embodiment 1

[0028] Coating a solid electrolyte on the surface of the negative electrode, negative electrode active material (graphite): organic solid electrolyte (the composition of the organic solid electrolyte is: the solute is lithium hexafluorophosphate, the solvent is a mixed solution of PC: EC: DEC = 1: 1: 1, Among them, the concentration of lithium hexafluorophosphate is 1mol / L)=100:0.5, the pole piece is completely covered and sealed with a collodion film, and then it is wound with the positive pole piece, put into the shell, and injected with 1mol / L tri(trifluoromethylsulfur Acyl) methyl lithium aqueous solution to make 18650 2000mAh battery.

Embodiment 2

[0030] Coat the solid electrolyte solution on the surface of the negative electrode, negative electrode active material (hard carbon): organic solid electrolyte solution (the composition of the organic solid electrolyte solution is: the solute is lithium hexafluorophosphate, and the solvent is a mixed solution of PC: EC: DEC = 1: 1: 1 , wherein the concentration of lithium hexafluorophosphate is 1mol / L)=100:5, use collodion film to completely cover and seal the pole piece, then wind it with the positive pole piece, put it into the shell, and inject 1mol / L tri(trifluoromethyl Sulfuryl) methyllithium aqueous solution to make a 186502000mAh battery.

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Abstract

The invention belongs to the field of lithium batteries, and in particular, relates to a water-borne lithium ion battery and a preparation method thereof. The surface of a negative electrode is coatedwith a solid electrolyte solution; a pole piece is completely coated and sealed with a semi-permeable membrane and is wound with a positive electrode piece and then put into a shell, a tris(trifluoromethyl thionyl)methyl lithium aqueous solution is injected, and the water-borne lithium ion battery is prepared. The water-borne electrolyte solution is adopted, the semi-permeable membrane is adopted, the function of the semi-permeable membrane can only allow lithium ions to pass through, other water molecules as well as organic solvents and anions cannot pass through the semi-permeable membrane,one side of the positive electrode is the water-borne electrolyte solution, and the speed of ion migration and the safety of the battery are ensured; the negative electrode adopts an organic electrolyte solution, and the large multiplying power performance of the battery is significantly improved, and the need of high voltage of the battery is met.

Description

technical field [0001] The invention belongs to the field of lithium batteries, and in particular relates to a water-based lithium ion battery and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the characteristics of high energy density, environmental protection, and no memory effect, and have been widely used in various industries. However, because the electrolyte of lithium-ion batteries uses organic solutions, the ion migration rate is much lower than that in water, which makes the batteries unsuitable for high-rate charging. Discharge; at the same time, using organic electrolyte, the battery is prone to fire and explosion; but limited to the water decomposition voltage of only 1.2V, which cannot meet the maximum requirement of 4.2V for lithium batteries, so water-based electrolyte cannot be used. Contents of the invention [0003] The invention provides a water-based lithium-ion battery, which includes a negative electrode, a pos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/36H01M10/38H01M4/525H01M4/583
CPCH01M4/525H01M4/583H01M10/36H01M10/38Y02E60/10Y02P70/50
Inventor 谢红波陈海初陈振兵
Owner HUNAN GRAND PRO ROBOT TECH
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