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Lithium-ion battery electrolyte and lithium-ion battery containing electrolyte

A lithium-ion battery and electrolyte technology, applied in the field of lithium-ion batteries, can solve the problems of poor electrode compatibility, low electrical conductivity, high price, etc., and achieve the effects of enhanced flame retardancy, low flammability, and reduced flammability

Inactive Publication Date: 2016-03-23
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

New high-heat electrolyte salts, such as LiODFB, LiFSI, LiFNFSI, etc., or organic solvents such as flame-retardant sulfones, and ionic liquids, are far from large-scale practical due to problems such as high price, high viscosity, low conductivity, or poor compatibility with electrodes. There is still a long distance

Method used

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  • Lithium-ion battery electrolyte and lithium-ion battery containing electrolyte
  • Lithium-ion battery electrolyte and lithium-ion battery containing electrolyte
  • Lithium-ion battery electrolyte and lithium-ion battery containing electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Electrolyte preparation: Lithium salt LiPF 6 Dissolved in a mixed solvent of EC, EMC, DEC and PC with a mass ratio of 40:25:30:5 to obtain a 0.9mol / L solution; then add 1.5% of VC and 2.5% of PS, 1% of VEC, 10% of FEC and 1% of LiBOB; then add 5% of the total weight of the electrolyte to the solution of fluorophosphoenyl ester additive 1, its structural formula is as follows:

[0025]

[0026] Mix well, the above operations are all in H 2 O2 <1ppm performed in a glove box.

[0027] Preparation of the positive electrode: In the homogenization equipment, using N-methylpyrrolidone NMP as solvent, 92.5wt% LiFePO 4 Mix with 4wt% superconducting carbon black SP and 3.5wt% polyvinylidene fluoride PVDF to form a uniform slurry, use coating equipment to coat it on aluminum foil, and get the positive electrode after rolling, shearing and drying piece.

[0028] Preparation of the negative electrode: in the homogenizing equipment, using distilled water as a solvent, 94.5wt% ...

Embodiment 2

[0032] Electrolyte preparation: Lithium salt LiPF 6 Dissolved in a mixed solvent of EC, EMC, DEC and PC with a mass ratio of 30:45:20:5 to obtain a 1.05mol / L solution; then add 3% of VC and 0.5% of the total weight of the electrolyte to the solution PS, 0.5% of VEC, 8% of FEC and 0.5% of LiBOB; then add 10% of the total weight of the electrolyte to the solution of fluorophosphoenyl ester additive 2, its structural formula is as follows:

[0033]

[0034] Mix well, the above operations are all in H 2 O2 <1ppm performed in a glove box.

[0035] Preparation of the positive electrode: In a homogenizer, using NMP as a solvent, 92.5wt% LiFePO 4 Mix it with 4wt% of SP and 3.5wt% of PVDF to form a uniform slurry, use a coating device to coat it on an aluminum foil, and roll, shear, and dry to obtain a positive electrode sheet.

[0036] Preparation of the negative electrode: In the homogenizing equipment, use distilled water as a solvent to mix 94.5wt% of artificial graphite with...

Embodiment 3

[0040] Electrolyte preparation: Lithium salt LiPF 6Dissolved in a mixed solvent of EC, EMC, DEC and PC with a mass ratio of 40:25:30:5 to obtain a 1.2mol / L solution; then add 1% of VC and 3% of the total weight of the electrolyte to the solution PS, 2% of VEC, 5% of FEC and 2% of LiBOB; then add 8% of the total weight of the electrolyte to the solution of fluorophosphoenyl ester additive 3, its structural formula is as follows:

[0041]

[0042] Mix well, the above operations are all in H 2 O2 <1ppm performed in a glove box.

[0043] Preparation of the positive electrode: In a homogenizer, use NMP as a solvent to mix 72wt% LiNi 0.5 co 0.2 mn 0.3 o 2 , 20.5% LiMn 0.8 Fe 0.2 PO 4 Mix it with 4wt% of SP and 3.5wt% of PVDF to form a uniform slurry, use a coating device to coat it on an aluminum foil, and roll, shear, and dry to obtain a positive electrode sheet.

[0044] Preparation of negative electrode: In homogenizing equipment, using distilled water as a solvent, 7...

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Abstract

The invention discloses lithium-ion battery electrolyte. The electrolyte comprises LiPF6, a non-aqueous organic solvent and additives, wherein the additives comprise fluoroalkenyl phosphate compounds and LiBOB, the structural general formula of the fluoroalkenyl phosphate compounds is the general formula I or the general formula II shown in the specification; according to the general formula, when R1 represents alkyl with 1-5 carbon atoms, R2 represents fluoroalkenyl, and when R1 represents fluoroalkyl, R2 represents any one of alkenyl with 2-5 carbon atoms and fluoroalkenyl with 2-5 carbon atoms. The flammability of the lithium-ion battery electrolyte is low, the gas production capacity of the lithium-ion battery prepared from the electrolyte is small in the charging and discharging processes, and the battery can be effectively prevented from expanding and has excellent high-temperature cycle performance.

Description

technical field [0001] The invention relates to a lithium ion battery electrolyte and a lithium ion battery containing the electrolyte, in particular to an electrolyte with low flammability, which can effectively prevent battery expansion and improve the high temperature performance of the battery, and a lithium ion battery containing the electrolyte. Battery. Background technique [0002] At present, the most widely used electrolyte system is LiPF 6 The mixed carbonate solution, the solute LiPF in the system 6 It will decompose at 75°C, is sensitive to water, easily produces HF, corrodes the current collector, SEI film and electrode active materials, and rapidly decays battery performance; the solvent has a low boiling point and a low flash point, and is easy to burn or explode, causing safety problems. New high-heat electrolyte salts, such as LiODFB, LiFSI, LiFNFSI, etc., or organic solvents such as flame-retardant sulfones, and ionic liquids, are far from large-scale pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0569H01M10/0525
CPCH01M10/0525H01M10/0567H01M10/0569H01M2300/0025H01M2300/0037Y02E60/10
Inventor 包婷婷
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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