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Non-aqueous electrolyte and non-aqueous electrolyte battery using same

A non-aqueous electrolyte and battery technology, used in secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve problems such as poor kinetic stability, increased chemical reaction rate, and reduced battery cycle charge and discharge capacity. , to achieve the effect of enhanced oxidation resistance, easy reduction, improved cycle performance and high temperature performance

Active Publication Date: 2022-01-25
SHANGHAI YUYUAN POWER TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lithium salts and solvents in the electrolyte may react chemically at high temperatures, and at the same time, the surface chemical reaction rate between the positive and negative electrode materials and the electrolyte increases, and the kinetic stability deteriorates, resulting in a rapid decrease in the cycle charge and discharge capacity of the battery at high temperatures

Method used

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  • Non-aqueous electrolyte and non-aqueous electrolyte battery using same
  • Non-aqueous electrolyte and non-aqueous electrolyte battery using same
  • Non-aqueous electrolyte and non-aqueous electrolyte battery using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-16

[0035] A non-aqueous electrolyte battery, the positive electrode is LiFePO 4 , the negative electrode is artificial graphite, the diaphragm is a microporous polyethylene film, and the electrolyte used is in the range of EC (ethylene carbonate): EMC (ethyl methyl carbonate): DMC (dimethyl carbonate) = 1:1:1 (volume ratio ) dissolved LiPF in the mixed solvent 6 Make a 1mol / L solution, and add the corresponding mass concentration of LiPO 2 f 2 , special lithium salt LiODFB (lithium difluorooxalate borate) and compounds, the compound structure formula is as follows:

[0036]

[0037] The synthetic route of compound is as follows:

[0038]

[0039] According to the above method, the prepared electrolyte and the associated positive and negative electrodes, diaphragm, etc. are made into the non-aqueous cylindrical 18650 battery of the embodiment in Table 1 below:

[0040] Table 1

[0041]

[0042]

[0043] The battery that the embodiment of the present invention and ...

Embodiment 17

[0061] A kind of non-aqueous electrolyte battery, positive pole LiNi x co y mn z L (1-x-y-z) o 2 , where L is one of Co, Al, Sr, Mg, Ti, Ca, Zr, Zn, Si, Fe, specifically: LiNi 0.33 co 0.33 mn 0.33 0 2 , LiNi 0.4 co 0.2 mn 0.4 0 2 , LiNi 0.4 co 0.3 mn 0.3 0 2 , LiNi 0.5 co 0.2 mn 0.3 0 2 , LiNi 0.6 co 0.2 mn 0.2 0 2 , LiNi 0.8 co 0.1 mn 0.1 0 2 , LiNi 0.9 co 0.05 mn 0.05 0 2 , LiNi 0.33 co 0.33 mn 0.27 al 0.06 0 2 , LiNi 0.6 co 0.17 mn 0.2 Mg 0.03 0 2 , LiNi 0.305 co 0.33 mn 0.33 Ti 0.025 0 2 , LiNi 0.33 co 0.305 mn 0.33 Ti 0.025 0 2 , LiNi 0.33 co 0.33 mn 0.305 Ti 0.025 0 2 , LiNi 0.784 co 0.1 mn 0.1 Ca 0.016 0 2 , LiNi 0.768 co 0.1 mn 0.1 Ca 0.03202 , LiNi 0.736 co 0.1 mn 0.1 Ca 0.064 0 2 , LiNi 0.5 co 0.2 mn 0.29 Zr 0.01 0 2 , LiNi 0.333 co 0.292 mn 0.333 Zn 0.041 0 2 , LiNi 0.333 co 0.25 mn 0.333 Zn 0.083 0 2 , LiNi 0.333 co 0.166 mn 0.333 Zn 0.167 0 2 , LiNi 0.333 co 0.3 mn 0.333 Fe ...

Embodiment 18

[0064] A kind of non-aqueous electrolyte battery, positive pole LiNi x co y mn z L (1-x-y-z) o 2 , where L is at least one of Co, Al, Sr, Mg, Ti, Ca, Zr, Zn, Si, Fe; 0≤x≤1, 0≤y≤1, 0≤z ≤1, 06 Make a 1mol / L solution, and add the corresponding mass concentration of LiPO 2 f 2 , special lithium salt LiBF4 (lithium tetrafluoroborate) and compounds, the compound structural formula is as follows:

[0065]

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Abstract

The invention is applicable to the technical field of batteries, and provides a non-aqueous electrolyte which comprises the following components: a lithium salt, wherein the mass percent of the lithium salt is 5-20%; a special lithium salt, wherein the mass percent of the special lithium salt is 0.1-5%; a solvent; and a compound, wherein the compound is composed of fluorosulfonic acid and nitrogen organic matter, the mass percent of the compound is 0.1-5%, the chemical formula of the compound is shown in the specification, in the formula, R1 and R2 are one of alkyl or oxygen-containing alkyl with the carbon atom number being 1-6. The invention also provides a non-aqueous electrolyte battery comprising the non-aqueous electrolyte. The compound contains fluorosulfonyl, the cycle performance and the high-temperature performance of the lithium ion battery are improved, meanwhile, F atoms are high in electronegativity, HOMO and LUMO energy of solvent molecules can be generally reduced through the substituted structure, accordingly, the oxidation resistance of the molecules is enhanced, and reduction is easier, so that a LiF-rich interface film can be formed, the cycle performance and the low-temperature performance of the battery are improved, and meanwhile, the electrolyte has better infiltration performance on a diaphragm and an electrode.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a nonaqueous electrolytic solution and a nonaqueous electrolytic solution battery using the same. Background technique [0002] The operating temperature range is one of the important performance indicators of the power system. Energy systems and power systems equipped with military equipment should have a wide operating temperature range, and the operating temperature range is not narrower than -40 to 55°C. However, it is currently difficult for lithium-ion batteries to work with high performance in such a wide temperature range. [0003] The wide temperature performance of lithium-ion batteries has a clear relationship with the positive electrode, electrolyte solution and negative electrode. The positive electrode material is usually the decisive factor in determining the working voltage and specific capacity of a lithium-ion battery; the combination of the negat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0567H01M10/0525H01M10/4235Y02P70/50
Inventor 尚德华刘帅
Owner SHANGHAI YUYUAN POWER TECH CO LTD
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