A kind of bistrifluoroethoxy bisfluoroborate lithium salt and lithium-ion battery low-temperature electrolyte and lithium-ion battery containing it

A technology of bis-trifluoroethoxy bis-fluoroborate lithium and lithium-ion batteries, which is applied in secondary batteries, circuits, electrical components, etc., can solve the problem of reduced electrolyte fluidity and ion mobility, inability to infiltrate graphite anode materials, The problems of increasing ion conduction resistance, etc., can achieve the effect of improving lithium ion migration rate, good low temperature capacity retention rate, and reducing surface energy.

Active Publication Date: 2020-02-07
李秀艳
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] One is that the viscosity of the electrolyte increases at low temperature, the fluidity and ion mobility of the electrolyte decrease, and the ion conduction resistance increases, which affects the discharge energy; this requires improving the solvent system and using a low-viscosity non-aqueous solvent for the electrolyte;
[0005] The second is that the surface energy of the electrolyte dissolved in a large amount of lithium hexafluorophosphate increases at low temperatures, and cannot effectively infiltrate with the graphite negative electrode material, causing the lithium ions in the electrode to exist in the form of lithium carbide to not effectively migrate from the negative electrode, affecting the discharge capacity; this requires Add additives that can effectively reduce the surface energy of the electrolyte

Method used

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  • A kind of bistrifluoroethoxy bisfluoroborate lithium salt and lithium-ion battery low-temperature electrolyte and lithium-ion battery containing it
  • A kind of bistrifluoroethoxy bisfluoroborate lithium salt and lithium-ion battery low-temperature electrolyte and lithium-ion battery containing it
  • A kind of bistrifluoroethoxy bisfluoroborate lithium salt and lithium-ion battery low-temperature electrolyte and lithium-ion battery containing it

Examples

Experimental program
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preparation example Construction

[0033] The preparation method of the positive electrode sheet is as follows: the ternary material LiNi 0.5 co 0.2 mn 0.3 o 2 , superP conductive agent, and PVDF adhesive are uniformly mixed according to 96%:2.0%:2.0% to make a certain viscosity of lithium-ion battery positive electrode slurry, which is coated on the aluminum foil of the current collector, and the coating amount is 0.02g / cm 2 , after drying at 90°C, cold pressing; then trimming, cutting, and slitting; then drying at 90°C for 5 hours under vacuum conditions, welding the tabs, and making a lithium-ion battery positive electrode that meets the requirements.

[0034] The preparation method of the negative electrode is as follows: graphite, conductive agent superP, thickener CMC, and binder SBR are made into slurry at a mass ratio of 96:1.0:1.0:2.0, coated on the current collector copper foil, and heated at 90°C Dry under vacuum, the coating weight is 0.01g / cm 2 ; After trimming, cutting, and slitting, dry at 11...

Embodiment 1

[0038] Lithium salt synthesis process:

[0039] 100 mL of acetonitrile solvent was added to a 200 mL flask, and 2.59 g of lithium fluoride, 14.19 g of boron trifluoride etherate, 10.0 g of 2,2,2-trifluoroethanol, and 4.25 g of silicon tetrachloride were sequentially added thereto. Reacted at room temperature for 4 hours, then distilled off the solvent under reduced pressure, and precipitated crystals at the same time, washed the crystals with a small amount of acetonitrile solvent after filtration, and dried them in vacuum at 80°C for 4 hours to obtain 16.5 g of white crystals with a yield of 95%; structural formula characterization data: 1H NMR (DMSO-d6, 200 MHz), δ: 4.05 (m, 4H).

Embodiment 2

[0041] Preparation of low-temperature electrolyte for lithium-ion batteries:

[0042] Lithium-ion battery low-temperature electrolyte includes: LiPF 6 , ethylene carbonate (EC), ethyl methyl carbonate (EMC), diethyl carbonate (DEC), additive vinylene carbonate (VC) and bistrifluoroethoxy bisfluoroborate lithium salt.

[0043] Ethylene carbonate (EC), ethyl methyl carbonate (EMC), diethyl carbonate (DEC), additive vinylene carbonate (VC) and bistrifluoroethoxy bisfluoroborate lithium salt, by mass ratio: EC : EMC: DEC: VC: bistrifluoroethoxy bisfluoroborate lithium salt=30%: 30%: 37.9%: 2%: 0.1%, mixed to obtain electrolyte solvent, in this electrolyte solvent, dissolve 1mol / LiPF of L 6 , to obtain a non-aqueous electrolyte.

[0044] Preparation of lithium-ion batteries:

[0045] Described lithium-ion battery comprises positive electrode sheet, negative electrode sheet, the separator that is spaced between positive and negative electrode sheet and electrolytic solution of ...

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Abstract

The invention provides a lithium secondary battery electrolyte lithium salt additive, namely bi-trifluoroethoxy bi-fluoride lithium borate salt, an electrolyte comprising the lithium salt and a battery. The electrolyte comprising the lithium salt comprises a non-aqueous organic solvent and 1M LiPF6 salt, wherein the 1M LiPF6 salt is dissolved in the non-aqueous organic solvent, and bi-trifluoroethoxy bi-fluoride lithium borate are contained in the non-aqueous organic solvent and accounts for 0.1-3% of total mass of the non-aqueous organic solvent. The lithium secondary battery comprising the lithium salt has favorable discharging capacity retention ratio under a low-temperature condition.

Description

Technical field: [0001] The present invention relates to a lithium ion battery electrolyte lithium salt-bistrifluoroethoxy bisfluoroborate lithium salt and its production method, and a lithium ion battery low-temperature electrolyte containing bistrifluoroethoxy bisfluoroborate lithium salt and Lithium Ion Battery. Background technique: [0002] Lithium-ion batteries have the advantages of high energy density, long service life, wide operating temperature range, good safety, environmental protection, and low self-discharge rate. They have been widely used in mobile devices, digital products, energy storage power stations, power batteries and other fields. With the development and gradual promotion of electric vehicles, problems such as poor low-temperature performance and low low-temperature capacity retention of lithium-ion batteries have gradually emerged. Usually, the discharge capacity of lithium-ion batteries at -30°C and below is only 20°C. 50% to 65% of the discharge...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0568H01M10/0567H01M10/0525
CPCY02E60/10
Inventor 李秀艳
Owner 李秀艳
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