Power battery and lithium ion electrolyte thereof

A lithium ion and electrolyte technology, applied in the field of lithium ion electrolyte and its power battery, can solve the problems of unreported high temperature performance, inability to play a protective role, low SEI film resistance, etc., to improve high temperature performance and cycle performance, The effect of improving cycle and high temperature performance, improving low temperature discharge performance

Inactive Publication Date: 2015-05-06
SHENZHEN 3SUN ELECTRONICS
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Chinese patent application number 201110390402.3 discloses a lithium-ion battery electrolyte and a lithium-ion secondary battery. By adding a certain amount of silane-based phosphate ester, the silane-based phosphate ester additive is used to preferentially form an SEI with low impedance on the surface of the negative electrode. film (solid electrolyte interface fil...

Method used

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  • Power battery and lithium ion electrolyte thereof
  • Power battery and lithium ion electrolyte thereof
  • Power battery and lithium ion electrolyte thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1. Preparation of positive pole piece:

[0020] Lithium iron phosphate is used as the positive electrode active material, PVDF (polyvinylidene fluoride) is used as the binder, and conductive graphite is used as the conductive agent. After the mixed slurry is coated on both sides of the positive electrode current collector composed of aluminum foil, it is dried and pressed as Positive pole piece.

[0021] 2. Preparation of negative pole piece:

[0022] Using artificial graphite as negative electrode active material, SBR (polystyrene, butadiene suspension) as binder, CMC (sodium carboxymethyl cellulose) as thickener, conductive carbon black as conductive agent, the prepared slurry After the material is coated on both sides of the negative electrode current collector composed of copper foil, it is dried and pressed as the negative electrode sheet.

[0023] 3. Preparation of isolation membrane:

[0024] The isolation film is made of PP / PE / PP three-layer material.

[002...

Embodiment 2

[0030] The difference with embodiment 1 is:

[0031] In the mixed solvent, add 1.0wt% bis(trimethylsilane) silyl sulfate, 2wt% VC, 1wt% LiBF 4 . Other than that, everything else remains the same, and the process of making the battery is the same, so I won’t go into details here.

Embodiment 3

[0033] The difference from Example 1 is: 1.0wt% of bis(triphenylsilane) silyl sulfate, 2wt% of VEC, and 2wt% of LiDFOB were added to the mixed solvent. Other than that, everything else remains the same, and the process of making the battery is the same, so I won’t go into details here.

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Abstract

The invention provides a power battery and a lithium ion electrolyte thereof. The lithium ion electrolyte comprises a non-aqueous organic solvent, lithium salt and an additive, wherein the additive comprises a first additive and a second additive, and the first additive comprises silane sulfate; the first additive accounts for 0.05 to 10% of the total weight of the electrolyte, and the second additive is an auxiliary additive and comprises one or more of vinylene carbonate, propane sultone, fluoroethylene carbonate, vinyl ethylene carbonate, ethylene sulfite, adiponitrile, and succinic anhydride in any proportion; the second additive accounts for 0.1-5wt% of the total weight of the electrolyte, and the non-aqueous organic solvent is a carbonic ester solvent, a carboxylic ester solvent, an ether solvent or a ketone solvent; and the lithium salt comprises primary lithium salt and secondary lithium salt.

Description

technical field [0001] The invention relates to a lithium ion electrolyte solution for a power battery and the power battery thereof, in particular to a lithium ion power battery electrolyte capable of improving the high-temperature performance of the lithium-ion power battery and improving the low-temperature discharge performance, and a lithium ion battery using the electrolyte. Power Battery. Background technique [0002] In the existing technology, with the development of society and the progress of industry, the demand for the environment and energy is increasing day by day, but it brings some social pressures such as environmental pollution, carbon dioxide emissions, and the gradual depletion of petroleum energy to the society. These pressures force Countries around the world are working hard to develop new energy that is green, environmentally friendly and sustainable. In 1990, Japan's Sony Corporation took the lead in commercializing lithium-ion batteries, which are...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567Y02E60/10
Inventor 玉正日梁世硕周文对
Owner SHENZHEN 3SUN ELECTRONICS
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