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Silicon-carbon system lithium ion battery electrolyte and silicon-carbon system lithium ion battery

A lithium-ion battery and electrolyte technology, which is applied in the field of silicon-carbon system lithium-ion battery electrolyte and silicon-carbon system lithium-ion battery, can solve the problems of high-temperature cycle performance to be improved, and achieve high residual capacity and recoverable capacity. Cycle performance, effect of reducing expansion rate

Active Publication Date: 2018-11-23
EVE ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The silicon-carbon negative lithium-ion battery of the invention has good cycle performance at room temperature and low temperature, but its high-temperature cycle performance needs to be improved

Method used

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  • Silicon-carbon system lithium ion battery electrolyte and silicon-carbon system lithium ion battery
  • Silicon-carbon system lithium ion battery electrolyte and silicon-carbon system lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] In this example, the preparation of lithium-ion battery electrolyte solutions A1-1 to A1-4 is provided. The preparation steps of the electrolyte solution are: mix dimethyl carbonate, ethylene carbonate and propylene carbonate at a ratio of 1:1:1 The mass ratio is mixed as an organic solvent; add additives to the organic solvent, after mixing evenly, add LiPF 6 , to obtain a mixed solution, which is the electrolyte. The relationship between the number of the obtained electrolyte and the composition of the electrolyte additives and the results of the conductivity of the electrolyte are shown in Table 1-1:

[0046] Table 1-1

[0047]

Embodiment 2

[0053] In this example, the preparation of lithium-ion battery electrolyte solutions A2-1 to A2-12 is provided. The preparation steps of the electrolyte solution are: mix dimethyl carbonate, ethylene carbonate and propylene carbonate at a ratio of 1:1:1 The mass ratio is mixed as an organic solvent; add additives to the organic solvent, after mixing evenly, add LiPF 6 , to obtain a mixed solution, which is the electrolyte. The relationship between the number of the obtained electrolyte and the composition of the electrolyte additives and the results of the conductivity of the electrolyte are shown in Table 2-1:

[0054] table 2-1

[0055]

Embodiment 3

[0061] The electrolyte solution prepared in Example 1-2 and Comparative Example 1-2 was used to prepare a lithium ion battery, and the lithium ion battery included a positive electrode sheet, a negative electrode sheet, a separator and an electrolyte solution.

[0062] Production of the positive electrode sheet:

[0063] The positive electrode active material lithium cobaltate (LiCoO 2 ), the conductive agent acetylene black, and the binder polyvinylidene fluoride (PVDF) are fully stirred and mixed in N-methylpyrrolidone (NMP) solvent at a weight ratio of 96:2:2 to form a uniform positive electrode slurry; The slurry was coated on the positive electrode current collector AA foil, dried and cold pressed to obtain the positive electrode sheet.

[0064] Production of negative electrode sheet:

[0065] Negative electrode active material silicon carbon, conductive agent acetylene black, binder styrene-hexyl rubber (SBR), thickener sodium carboxymethyl cellulose (CMC) in an approp...

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Abstract

The invention provides a silicon-carbon system lithium ion battery electrolyte and a silicon-carbon system lithium ion battery. The silicon-carbon system lithium ion battery electrolyte comprises an organic solvent, an electrolyte lithium salt and additives, wherein the additives include propylene sulfite and tetramethyl diamine compounds; when the electrolyte is used in the silicon-carbon systemlithium ion battery, the conductivity of the electrolyte and the stability of a negative electrode silicon carbon interface film can be improved; and meanwhile, the expansion rate of the battery is reduced, the internal resistance is lowered, and the high and low temperature discharge performance of the silicon-carbon system lithium ion battery is improved.

Description

technical field [0001] The invention belongs to the technical field of battery electrolyte, and relates to a silicon-carbon system lithium-ion battery electrolyte and a silicon-carbon system lithium-ion battery. Background technique [0002] Lithium-ion batteries have become the most important energy storage devices in various electronic products, wireless communications and transportation facilities due to their excellent performance. [0003] At present, commercial silicon-carbon lithium-ion batteries mainly use graphite-like carbon materials as negative electrode active materials. However, carbon-based anode materials cannot meet the miniaturization of electronic equipment and the high-power and high-capacity requirements of silicon-carbon lithium-ion batteries for vehicles due to their low specific capacity and safety problems caused by lithium deposition. The high energy density of the material, high safety performance, and the silicon-carbon anode suitable for use in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M2300/0025Y02E60/10
Inventor 王健葛辉明刘金成
Owner EVE ENERGY CO LTD
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