Electrolyte of high-voltage lithium ion battery

A lithium-ion battery and electrolyte technology, applied in the field of lithium-ion batteries, can solve problems such as increasing battery internal resistance, deteriorating cycle performance, and capacity loss

Inactive Publication Date: 2018-10-16
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the current commercial lithium-ion battery electrolytes mainly use carbonates and carboxylates as solvents. When the charging voltage of this type of electrolyte exceeds 4.5V, LiPF 6 Will accelerate the decomposition to generate HF and PF 5 , the former will react with the positiv

Method used

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  • Electrolyte of high-voltage lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) The boron-containing additive lithium bisoxalate borate (LiBOB) has good film-forming properties. It can not only form a layer of SEI film on the graphite negative electrode, but also form a protective film on the surface of the positive electrode material to prevent the ester electrolyte and The positive electrode material contact at high potential is oxidized, slowing down the capacity loss of lithium-ion batteries during cycling.

[0025] (2) In order to test the influence of a small amount of boron-containing additive lithium bisoxalate borate (LiBOB) on the cycle performance of lithium-ion batteries under high voltage conditions, LiBOB with a mass fraction of 1% was added to the conventional electrolyte configured in the comparative example and applied The positive electrode material is lithium nickel manganese oxide LiNi 0.5 mn 1.5 o 4 , the negative electrode material is artificial graphite, and the diaphragm is a Celgard 2400 high-voltage lithium-ion batte...

Embodiment 2

[0028] (1) Because of its nucleophilic group-CN, dinitrile additives can be used to eliminate HF generated during lithium-ion battery cycling and protect the electrodes. In addition, it will also interact with PF 5 The reaction occurs to eliminate the by-product PF 5 In this way, the oxidative decomposition film-forming reaction of the ester solvent is suppressed, thereby improving the cycle performance of the high-voltage lithium-ion battery.

[0029] (2) In order to test the impact of a small amount of dinitrile additives on the cycle performance of lithium-ion batteries under high voltage conditions, succinonitrile with a mass fraction of 1% is added to the conventional electrolyte configured in the comparative example and applied to the positive electrode material as Lithium nickel manganese oxide LiNi 0.5 mn 1.5 o 4 , the negative electrode material is artificial graphite, and the diaphragm is a Celgard 2400 high-voltage lithium-ion battery.

[0030] (3) The prepared ...

Embodiment 3

[0032] (1) In order to test the influence of different types of dinitrile additives on the cycle performance of lithium-ion batteries under high voltage conditions, adiponitrile with a mass fraction of 1% was added to the conventional electrolyte configured in the comparative example and applied to the positive electrode material lithium nickel manganese oxide LiNi 0.5 mn 1.5 o 4 , the negative electrode material is artificial graphite, and the diaphragm is a Celgard 2400 high-voltage lithium-ion battery.

[0033] (2) Perform charge and discharge tests on the prepared lithium-ion battery on the blue electric test system.

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Abstract

The invention provides an electrolyte for a high-voltage lithium ion battery, and belongs to the field of a lithium ion battery. The electrolyte comprises a non-aqueous organic solvent, a lithium saltand an additive, wherein the non-aqueous organic solvent is an ester solvent, the mass percent of the non-aqueous organic solvent accounts for 95% or above, the lithium salt is LiPF6, the concentration of the lithium salt is (1.0-1.5)mol/L, the additive is a mixture of a dinitrile compound and a boron-containing compound, and the mass percent of the additive accounts for 1-5%. The electrolyte employing the mixture of the dinitrile compound and borate as an electrolyte additive is applicable to a high-voltage positive electrode material LiNi<0.5>Mn<1.5>O<4> system, it is found that the interface impedance of the lithium ion battery positive electrode material can be improved by such the electrolyte, and moreover, the cycle stability of the lithium ion battery under a normal temperature isimproved.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, and relates to an electrolyte solution suitable for high-voltage lithium-ion batteries. Background technique [0002] Lithium-ion batteries have the advantages of high voltage, high specific energy, long cycle life and good safety. Since Sony commercialized them in the 1990s, lithium-ion batteries have been widely used in mobile phones, digital cameras and notes, etc. Portable devices, especially in recent years, have been widely used in large electric vehicles and energy storage devices, and the energy density requirements of lithium-ion batteries are also getting higher and higher. [0003] The use of high charge cut-off potential cathode materials is one of the main ways to increase the energy density of lithium-ion batteries. The high charge cut-off potential cathode materials mainly include LiNi 0.5 mn 1.5 o 2 (4.7V vs. Li / Li + ), LiCoPO 4 (4.8V vs. Li / Li + ) and LiNiPO 4 (5.1V vs...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M2300/0025Y02E60/10
Inventor 薛文东王兴宇王玉田胡凯戎马屹飞白立雄李勇
Owner UNIV OF SCI & TECH BEIJING
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