A kind of lithium battery electrolyte and the obtained lithium primary battery

An electrolyte and lithium battery technology, applied in the field of lithium primary batteries, can solve problems such as battery failure to work normally, shorten battery life, destroy passivation films, etc., to improve electrochemical performance, prevent graphite layer peeling, and improve safety performance Effect

Active Publication Date: 2019-02-15
HUIZHOU HUIDERUI LITHIUM BATTERY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the safety issues of lithium primary batteries have always attracted much attention. The main reason is that most of the lithium primary batteries produced in the market currently contain combustion-supporting lithium salts (such as lithium perchlorate). Under extreme conditions such as lithium salts, it is easy to react violently with the electrolyte, causing the electrolyte to burn, and the inside of the battery is heated and exploded.
In the production of high-discharge rate primary lithium batteries, high-conductivity fluorine-containing lithium salts (such as lithium bistrifluoromethanesulfonylimide and lithium perfluoroalkylsulfonylimide) are often added. The process will corrode the aluminum foil, destroy the passivation film of the aluminum foil, and make the battery unable to work normally, thereby greatly shortening the service life of the battery

Method used

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  • A kind of lithium battery electrolyte and the obtained lithium primary battery

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The positive active material is selected from manganese dioxide, conductive agent carbide, and binder. Pure water is added and stirred until uniform. The dispersed positive active material slurry is coated on the positive electrode aluminum foil current collector. After rolling, it is cut into the positive electrode of the battery. piece. After the positive electrode sheet is dried and completely removed the moisture, it is placed in an environment with a relative humidity lower than 1.0%, and a porous separator is inserted between the negative electrode (metal aluminum or lithium aluminum alloy) and the positive electrode sheet to separate the positive and negative electrodes. The film is wound into a cylindrical cell, and the wound cell is placed in the battery shell (the shell is a steel shell, aluminum shell or aluminum-plastic film), and the battery is assembled by liquid injection.

[0016] In the electrolyte part, use xLiFSI-yLiClO 4 As a mixed lithium salt (45%...

Embodiment 2

[0018] In the same way as in Example 1, the positive electrode material is carbon monofluoride, and xLiFSI-yLiClO is used. 4 As mixed lithium salt (45%e ―PC f As an anti-corrosion agent (wherein the concentration of lithium dioxalate borate LiBOB in the anti-corrosion agent is 1mol / L, e , f is the solvent mass percentage, of which 10%e f 2 ―EC is added to the electrolyte as a composite flame retardant. Among them, the total lithium ion concentration of the mixed lithium salt is 1 mol / L, and in the mixed lithium salt, the mass percentage of LiFSI is 50%, and the LiClO 4 The mass percentage is 46%, the lithium salt LiBOB-AN in the anti-corrosion agent 10% ―PC 90% accounting for the mixed lithium salt LiFSI-LiClO 4 -4% of the total mass percentage of LiBOB. In the composite flame retardant, the phosphorus-containing flame retardant triethyl phosphate TEP accounts for 3% of the total weight of the electrolyte, and the fluorine-containing flame retardant CHF 2 ―EC accounts f...

Embodiment 3

[0020] In the same manner as in Example 1, iron disulfide was used as the positive electrode material, and xLiFSI-yLiClO was used. 4 As mixed lithium salt (45%e ―PC f As an anti-corrosion agent (wherein the concentration of lithium dioxalate borate LiBOB in the anti-corrosion agent is 1mol / L, e , f is the solvent mass percentage, of which 10%e f 3 ―EC is added to the electrolyte as a composite flame retardant. Among them, the total lithium ion concentration of the mixed lithium salt is 1.1 mol / L. In the mixed lithium salt, the mass percentage of LiFSI is 55%, and LiClO 4 The mass percentage is 41%, the lithium salt LiBOB-AN in the anti-corrosion agent 10% ―PC 90% accounting for the mixed lithium salt LiFSI-LiClO 4 -4% of the total mass percentage of LiBOB. In the composite flame retardant, the phosphorus-containing flame retardant triphenyl phosphate TPP accounts for 3% of the total weight of the electrolyte, and the fluorine-containing flame retardant CF 3 ―EC accounts...

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Abstract

The invention belongs to the field of chemical batteries and particularly relates to a lithium battery electrolyte and a lithium primary battery containing the same. The lithium battery electrolyte comprises an organic solvent and an electrolyte. The electrolyte is mixed lithium salt, and the mixed lithium salt is composed of LiFSI and lithium perchlorate. A general formula of the mixed salt is xLiFSI-yLiClO4, wherein 45%<x<70%; 30%<y<55%; and x and y are mass percents. The primary battery obtained through the lithium battery electrolyte is suitable for lithium primary battery systems such as Li / MnO2, Li / FeS2, Li / CuO and Li / (CF)x. The obtained primary battery is low in production cost and excellent in safety performance and low temperature discharge effect.

Description

technical field [0001] The invention relates to the field of chemical batteries, in particular to a lithium battery electrolyte and the obtained lithium primary battery. Background technique [0002] Lithium primary batteries have the advantages of high specific energy, high energy density, high (open / discharge) circuit voltage, stable discharge voltage, wide operating temperature range, good low temperature performance and long storage life. Favored by consumers. However, the safety problems of lithium primary batteries have always been concerned, mainly because most of the lithium primary batteries produced in the current market contain combustion-supporting lithium salts (such as lithium perchlorate). Under extreme conditions such as lithium salt, it is easy to react violently with the electrolyte, causing the electrolyte to burn, and the interior of the battery is heated and exploded. In the production of high-discharge rate primary lithium batteries, high-conductivity...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M6/16
CPCH01M6/166H01M6/168H01M2300/0025
Inventor 何献文潘文硕李少华
Owner HUIZHOU HUIDERUI LITHIUM BATTERY TECHNOLOGY CO LTD
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