Fluorine-containing sulfonate electrolyte additive, electrolyte containing additive and lithium ion battery

An electrolyte additive and electrolyte technology, which is applied in the field of lithium-ion batteries, can solve problems that cannot be generally achieved, and achieve the effects of suppressing side reactions, improving stability, and ensuring excellent performance

Active Publication Date: 2020-12-08
GUANGZHOU TINCI MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this solution can not generally reach more

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  • Fluorine-containing sulfonate electrolyte additive, electrolyte containing additive and lithium ion battery
  • Fluorine-containing sulfonate electrolyte additive, electrolyte containing additive and lithium ion battery
  • Fluorine-containing sulfonate electrolyte additive, electrolyte containing additive and lithium ion battery

Examples

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Embodiment 1

[0028] 1. Preparation of electrolyte: mix ethylene carbonate (EC), diethyl carbonate (DEC) and ethyl methyl carbonate (EMC) according to the mass ratio of EC:DEC:EMC=1:1:1, after mixing Add 1 mol of lithium hexafluorophosphate (LiPF 6 ), after the lithium salt was completely dissolved, 0.5% of compound 1 was added.

[0029] 2. Preparation of the positive electrode sheet: the nickel-cobalt lithium manganate ternary material LiNi 0.6 co 0.2 mn 0.2 o 2 , conductive agent SuperP, binder PVDF, and carbon nanotubes (CNT) are uniformly mixed at a mass ratio of 97.5:1.5:1:1 to make a certain viscosity lithium-ion battery positive electrode slurry, which is coated on the aluminum foil for current collector. The coating weight is 324g / m 2 , after drying at 85°C, cold pressing; then edge trimming, cutting, slitting, and drying at 85°C for 4 hours under vacuum conditions after slitting, and welding the tabs to make a lithium-ion battery positive electrode that meets the requirements ...

Embodiment 10

[0034] 1. Preparation of electrolyte: mix ethylene carbonate (EC), diethyl carbonate (DEC) and ethyl methyl carbonate (EMC) according to the mass ratio of EC:DEC:EMC=1:1:1, after mixing Add 1 mol of lithium hexafluorophosphate (LiPF 6 ), after the lithium salt was completely dissolved, 0.5% of compound 1 was added.

[0035] 2. Preparation of positive electrode sheet: lithium cobalt oxide material LiCoO 2 , conductive agent SuperP, binder PVDF, and carbon nanotubes (CNT) are uniformly mixed at a mass ratio of 97.5:1.5:1:1 to make a certain viscosity lithium-ion battery positive electrode slurry, which is coated on the aluminum foil for current collector. The coating weight is 316g / m 2 , after drying at 85°C, cold pressing; then edge trimming, cutting, slitting, and drying at 85°C for 4 hours under vacuum conditions after slitting, and welding the tabs to make a lithium-ion battery positive electrode that meets the requirements piece.

[0036] 3. Preparation of the negative ...

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Abstract

The invention discloses a fluorine-containing sulfonate electrolyte additive, an electrolyte containing the additive and a lithium ion battery, the electrolyte additive comprises the following structural formula I, A can be one of benzene ring, pyridine and silane; B may be a fluoroalkyl group. In addition, the general structural formula of the fluorine-containing alkyl in the structural formula is CaFmHn, a is equal to 1-6, n is greater than or equal to 0, m is greater than or equal to 1, and m + n is 2a + 2. The additive can react on the positive electrode and the negative electrode of the battery to form a stable interface film on the surface of the electrode, so that the cyclic gas production of the electrolyte is effectively inhibited, the cycle performance and the low-temperature discharge performance of the electrolyte under high voltage are improved, and particularly, the excellent performance of the lithium cobalt oxide and NCM ternary system lithium ion battery under high temperature and high voltage can be ensured.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a fluorine-containing sulfonate electrolyte additive, an electrolyte containing the additive, and a lithium ion battery. Background technique [0002] With the widespread application of lithium-ion batteries in portable electronic devices such as mobile phones and notebook computers, the demand for their small size, light weight and performance improvement has become increasingly significant. In recent years, as lithium-ion batteries are used as power sources for hybrid electric vehicles (HEV), plug-in hybrid electric vehicles (PHEV), and electric vehicles (EV), competition for their development to improve performance and reduce costs has intensified. At the same time, the research on batteries used in solar and wind power generation energy storage devices continues to heat up. The application requirements in these fields urgently need to improve the energy density ...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0567H01M10/0525H01M10/4235H01M2300/0025Y02E60/10
Inventor 李健辉范伟贞信勇赵经纬
Owner GUANGZHOU TINCI MATERIALS TECH
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