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Electrolyte additive, electrolyte, and secondary battery

An electrolyte additive and electrolyte technology, which are applied in the fields of secondary batteries, electrolytes, and electrolyte additives, can solve the problems of poor safety performance of positive and negative electrode materials with high gram capacity, etc.

Active Publication Date: 2021-10-15
EVERGRANDE NEW ENERGY TECH SHENZHEN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an electrolyte additive, an electrolyte, and a secondary battery, aiming to solve the technical problem of poor safety performance of high-gram-capacity positive and negative electrode materials used in existing batteries to a certain extent

Method used

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  • Electrolyte additive, electrolyte, and secondary battery
  • Electrolyte additive, electrolyte, and secondary battery
  • Electrolyte additive, electrolyte, and secondary battery

Examples

Experimental program
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Effect test

Embodiment 1

[0058] an electrolyte , and its preparation includes the steps of: mixing 300g of EC, 600g of EMC, and 100g of DEC in a glove box with a water content of less than 1ppm and an oxygen content of less than 2ppm to form a mixed organic solvent; then, adding an appropriate amount of fully dried LiPF 6 The lithium salt concentration of the electrolyte is 1 mol / L to obtain a basic electrolyte. Then add 0.05% SPNCS-1 to the basic electrolyte, Electrolyte E1 is obtained.

[0059] A lithium ion battery , its production includes the steps:

[0060] ① Mix the positive electrode material Ni83, carbon black, carbon nanotubes, and polyvinylidene fluoride PVDF in a ratio of 100:0.6:0.6:1.5, coat it on a 12μm aluminum foil, and then dry it at 85°C to obtain the positive electrode piece.

[0061] ② Mix graphite material, carbon black, styrene-butadiene rubber SBR, and sodium carboxymethyl cellulose CMC in a ratio of 100:0.9:1.9:1.5, coat it on an 8μm copper foil, and then dry it at 90°C ...

Embodiment 2

[0065] an electrolyte , the difference from Example 1 is: add 0.1% SPNCS-2 in the electrolyte, Electrolyte E2 is obtained.

[0066] A lithium ion battery , which differs from Example 1 in that: the electrolyte E2 is used, and the obtained lithium ion battery is C2.

Embodiment 3

[0068] an electrolyte , its difference from Example 1 is: add 0.5% SPNCS-3 in the electrolyte, Electrolyte E3 is obtained.

[0069] A lithium ion battery , which differs from Example 1 in that: the electrolyte E3 is used, and the obtained lithium ion battery is C3.

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Abstract

The invention belongs to the technical field of batteries, and particularly relates to an electrolyte additive, an electrolyte and a secondary battery. The structural general formula of the electrolyte additive is shown in a following formula I, and x and Y in the formula I are respectively and independently selected from one of isothiocyano group, cyclohexyl group, alkoxy group, phenyl group and halogen. According to the electrolyte additive provided by the invention, side reactions on the surface of a positive electrode can be reduced, flame-retardant phosphorus free radicals are generated, and the cycling stability and the safety performance of a pole piece are improved; and an SEI film can be polymerized on the surfaces of a positive electrode and a negative electrode, so that the elasticity of the SEI film is improved, the SEI film can better adapt to the huge volume expansion and shrinkage stress of electrode materials, such as a silicon substrate, etc., in a lithium intercalation and deintercalation process, and the cycling stability and safety of the battery are improved.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to an electrolyte additive, an electrolyte, and a secondary battery. Background technique [0002] Lithium-ion batteries are widely used in mobile phones, computers, cameras, electric vehicles and other fields due to their advantages such as high specific energy, long cycle life, and no memory effect. With the continuous development of science and technology, various application fields have put forward higher requirements for the performance of lithium-ion batteries. Among them, the most urgent thing is to improve the energy density of lithium-ion batteries under the premise of ensuring safety. At present, the industry is pursuing higher energy density of lithium batteries, which is also an important indicator reflecting battery technology. Positive and negative materials with higher gram capacity need to be used. As the most commercialized choice at present, the posi...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0567H01M10/0525H01M10/4235H01M2300/0025Y02P70/50
Inventor 钟海敏
Owner EVERGRANDE NEW ENERGY TECH SHENZHEN CO LTD
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