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Anticorrosive electrolyte of lithium battery and obtained lithium primary battery

An electrolyte and lithium battery technology, applied in primary batteries, primary battery use/maintenance, electrolyte/electrode capacity ratio, etc., can solve problems such as battery failure, battery fire and explosion, battery life shortening, etc., to improve electrochemical performance. Performance, anti-corrosion effect, anti-corrosion effect

Inactive Publication Date: 2017-02-22
HUIZHOU HUIDERUI LITHIUM BATTERY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the lithium salts used in production have defects, such as lithium perchlorate, which is cheap, easy to prepare, has high conductivity and strong thermal stability, but it is easy to react with organic electrolytes under some extreme conditions and cause the battery to catch fire explode
Another example is the fluorine-containing high-conductivity lithium salt: lithium bistrifluoromethanesulfonyl imide, which has a very high degree of dissociation and conductivity, but it has a strong corrosion effect on aluminum foil during use, causing the battery to fail. Normal work, resulting in greatly reduced battery life

Method used

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  • Anticorrosive electrolyte of lithium battery and obtained lithium primary battery
  • Anticorrosive electrolyte of lithium battery and obtained lithium primary battery

Examples

Experimental program
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Effect test

Embodiment 1

[0016] The positive electrode active material is made of iron disulfide, conductive agent acetylene black, graphite, and binder, and pure water is added to stir until uniform, and the dispersed positive electrode active material slurry is coated on the positive electrode aluminum foil current collector, and then cut into batteries after rolling the positive plate. After the positive electrode sheet is dried and completely removes the moisture in it, it is placed in an environment with a relative humidity below 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 membrane is wound into a cylindrical cell, and the wound cell is put into the battery casing (the casing is a steel casing, an aluminum casing or an aluminum-plastic film), and the battery is assembled by injecting liquid.

[0017] In the electrolyte part, lithium bistrifl...

Embodiment 2

[0019] In the same manner as in Example 1, carbon monofluoride is selected as the positive electrode material, lithium bistrifluoromethanesulfonimide LiTFSI, lithium bisoxalate borate LiBOB and lithium perchlorate are used as lithium salts, wherein bistrifluoromethanesulfonimide The mass proportion of lithium LiTFSI in the mixed lithium salt is 60%, the mass proportion of lithium bisoxalate borate LiBOB in the mixed lithium salt is 39%, the mass proportion of lithium perchlorate in the mixed lithium salt is 1%, the mixed lithium salt The concentration is 1.1M. Select ethylene carbonate EC, vinylene carbonate VC, dimethyl sulfite DMS and ethyl formate EF as electrolytes, wherein the volume percentage of ethylene carbonate EC is 30%, and the volume percentage of vinylene carbonate VC is 20% %, the volume percentage of dimethyl sulfite DMS is 20%, and the volume percentage of ethyl formate EF is 30%. The positive electrode, negative electrode, electrolyte and diaphragm of the pr...

Embodiment 3

[0021] In the same manner as in Example 1, manganese dioxide is selected as the positive electrode material, lithium bistrifluoromethanesulfonimide LiTFSI, lithium bisoxalate borate LiBOB and lithium perchlorate are used as lithium salts, wherein lithium bistrifluoromethanesulfonylimide The mass proportion of LiTFSI in the mixed lithium salt is 70%, the mass proportion of LiBOB in the mixed lithium salt is 29%, the mass proportion of lithium perchlorate in the mixed lithium salt is 1%, and the mass proportion of the mixed lithium salt The concentration is 1.2M. Select ethylene carbonate EC, dimethyl carbonate DMC, diethyl sulfite DES and ethyl acetate EA as the electrolyte, wherein the volume percentage of ethylene carbonate EC is 45%, and the volume percentage of dimethyl carbonate DMC is 5% %, the volume percentage of diethyl sulfite DES is 30%, and the volume percentage of ethyl acetate EA is 20%. The positive electrode, negative electrode, electrolyte and separator of the...

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Abstract

The invention belongs to the technical field of chemical batteries, and particularly relates to an anticorrosive electrolyte of a lithium battery and an obtained lithium primary battery. The anticorrosive electrolyte of the lithium battery comprises an organic solvent and an electrolyte, wherein the electrolyte is a mixed lithium salt; and the mixed lithium salt comprises lithium bis(trifluoromethanesulfonyl ) imide LiTFSI, lithium bis(oxalatoe ) borate LiBOB and lithium perchlorate. The lithium salt with a good anticorrosive effect and good heat stability is added to the electrolyte, so that the problems that aluminum foil is corroded and the battery is short in service life and poor in safety due to use of a high-conductivity fluorine-containing lithium salt are solved on the basis of not reducing the capacity of the battery and the protection effect on the aluminum foil. In addition, the electrolyte provided by the invention is suitable for the electrolytes, such as lithium / manganese dioxide (Li / MnO2), lithium / iron disulfide (Li / FeS2), lithium / copper oxide (Li / CuO), lithium / fluorinated carbon [Li / (CF)x], used for the lithium primary battery, and has the advantages of high applicability, a wide range and the like.

Description

technical field [0001] The invention relates to the field of chemical batteries, in particular to a lithium battery anti-corrosion electrolyte and the resulting lithium primary battery. Background technique [0002] Lithium primary batteries occupy a dominant position in the market consumption of primary batteries because of their 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. . In the selection of electrolyte lithium salts for high-quality lithium primary batteries, we all tend to choose lithium salts with high conductivity, good thermal stability, high safety factor and no damage to the internal structure of the battery. However, there are quite few lithium salts that need to have many advantages, and most of them are in the laboratory research and development stage, and there is still a considerable distance from their ind...

Claims

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Application Information

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IPC IPC(8): H01M6/16H01M6/14H01M6/50
CPCH01M6/166H01M6/14H01M6/5072H01M2006/5094
Inventor 何献文潘文硕许石桦
Owner HUIZHOU HUIDERUI LITHIUM BATTERY TECHNOLOGY CO LTD
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