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Lithium ion battery electrolyte

A lithium-ion battery and electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve problems such as damage to the structure of graphite sheets, unfavorable performance of graphite, and peeling

Active Publication Date: 2013-05-01
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When propylene carbonate is used in combination with graphite, the propylene carbonate solvent molecules cannot form a stable SEI film on the surface of the graphite electrode, and it is embedded in the graphite layer along with the solvated lithium ions, causing the graphite to peel off, thereby destroying the graphite sheet. structure, which adversely affects the performance of graphite, making battery capacity, cycle and other performance worse

Method used

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Examples

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Effect test

Embodiment 1

[0043] Preparation of lithium-ion battery electrolyte: mix propylene carbonate (PC), ethylene carbonate (EC) and diethyl carbonate (DEC) in a ratio of 1:1:1 (mass ratio) to make 1mol / L LiPF 6 To the electrolyte solution, add 2% (by mass) of N-methylsulfonylphthalimide (the structural formula is shown below) to obtain the lithium-ion battery electrolyte solution.

[0044]

[0045] Preparation of lithium-ion battery: inject the electrolyte solution prepared above into a 2430 button battery. The graphite used is natural graphite, the weight of the pole piece coated on the copper current collector is 13.9 mg, the mass content of the graphite active material in the pole piece is 96.5%, and the counter electrode is a lithium piece. For this button, discharge at 0.05C to 0.005V, and then discharge at 0.05mA to 0.005V. This is the process of lithium ions intercalating into graphite. The capacity of this process is called lithium intercalation capacity of graphite, and the lithium i...

Embodiment 2

[0049] Prepare lithium-ion battery electrolyte: mix propylene carbonate (PC), ethylene carbonate (EC) and diethyl carbonate (DEC) in a ratio of 1:1:1 (mass ratio) to make 1mol / L LiPF6 electrolyte, add 5% (by mass) of N-methylsulfonylsuccinimide (the structural formula is shown below), that is, the lithium-ion battery electrolyte is prepared.

[0050]

[0051] Preparation of lithium-ion battery: inject the electrolyte solution prepared above into a 2430 button battery. The graphite used is natural graphite, the weight of the pole piece coated on the copper current collector is 13.9 mg, the mass content of the graphite active material in the pole piece is 96.5%, and the counter electrode is a lithium piece. For this button, discharge at 0.05C to 0.005V, and then discharge at 0.05mA to 0.005V. This is the process of lithium ion intercalation into graphite. The capacity of this process is called lithium intercalation capacity of graphite, and the lithium intercalation capacity ...

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Abstract

The invention provides a lithium ion battery electrolyte, which comprises a non-aqueous organic solvent, lithium salt soluble in the non-aqueous organic solvent, and an addition agent of a compound containing an N-sulfonyl dicarboximide group, wherein the compound containing the N-sulfonyl dicarboximide group is represented by a general formula (1); a functional group of R1 in the general formula (1) is shown in the specification, or R2 in the general formula (1) is an alkyl group of C1-C12, and a naphthenic base, an allyl group or an aryl group of C3-C8; hydrogen atoms in the R2 can be partially or wholly replaced by halogen atoms. When the compound containing the N-sulfonyl dicarboximide group is added into the lithium ion battery electrolyte, a charging process of a battery is prior to reductive decomposition of an organic solvent in the electrolyte, and a layer of solid electrolyte interphase (SEI) is better formed on a surface taking graphite as an active material, so that the problem of positive pole piece graphite stripping is effectively solved, and the performance of positive pole piece deintercalation lithium is improved.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to electrolytes for lithium-ion batteries. Background technique [0002] Compared with other rechargeable batteries, lithium-ion batteries have the advantages of high energy density, high operating voltage, long cycle life, and low self-discharge. At present, small-capacity lithium-ion batteries have been successfully used in mobile phones, digital cameras, notebook computers, etc. At the same time, large-capacity and high-power lithium-ion power batteries also have good application prospects. [0003] Graphite is the most commonly used anode material for lithium-ion batteries and is currently the most widely used electrode material. During the first charging process of the battery, the lithium ions released by the lithium-transition metal oxide of the positive electrode of the battery pass through the electrolyte, pass through the separator to reach the graphite anode, and un...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 叶士特王小梅付成华赵丰刚王阿忠褚春波
Owner NINGDE AMPEREX TECH
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