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Electrolyte for lithium ion battery, lithium ion battery, battery module, battery pack and device

A technology for lithium ion batteries and battery modules, applied in the fields of battery packs, devices, and electrolytes, can solve problems such as unsatisfactory storage performance and cycle performance, improve high-temperature storage performance and cycle performance, and improve oxidation resistance and thermal stability. , the effect of ensuring compactness

Active Publication Date: 2020-02-07
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the current lithium-ion batteries still face problems such as unsatisfactory storage performance and cycle performance at high temperatures during use.

Method used

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  • Electrolyte for lithium ion battery, lithium ion battery, battery module, battery pack and device
  • Electrolyte for lithium ion battery, lithium ion battery, battery module, battery pack and device
  • Electrolyte for lithium ion battery, lithium ion battery, battery module, battery pack and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～19、 comparative example 1～11

[0071] The electrolyte solutions and lithium-ion batteries in Examples 1-19 and Comparative Examples 1-11 were prepared according to the following methods.

[0072] (1) Preparation of positive electrode sheet: mix the positive active material, conductive carbon black (Super P), and binder polyvinylidene fluoride (PVDF) according to the mass ratio of 97:1.5:1.5, and add to the solvent N - In methylpyrrolidone (NMP), use a vacuum mixer to stir until the system becomes uniform and transparent to obtain a positive electrode active material slurry, which is evenly coated on the positive electrode current collector aluminum foil and dried, and then cold pressed , trimming, cutting, and slitting to obtain positive pole pieces.

[0073] (2) Preparation of negative electrode sheet: Negative active material, conductive agent conductive carbon black (Super P), thickener sodium carboxymethyl cellulose (CMC), binder styrene-butadiene rubber emulsion (SBR) according to the mass ratio of 96....

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Abstract

The invention provides an electrolyte for a lithium ion battery, the lithium ion battery, a battery module, a battery pack and a device. The electrolyte provided by the invention comprises a non-aqueous solvent, and a lithium salt and an additive which are dissolved in the non-aqueous solvent. The additive comprises cyclosiloxane and fluoroether. The invention also provides a lithium ion battery comprising the electrolyte. According to the electrolyte provided by the invention, cyclosiloxane and fluoroether are used together and are subjected to a synergistic reaction on the surface of a positive electrode, and a silicon-oxygen-containing group and a fluorine-oxygen-containing group are combined to form an interface film containing silicon, oxygen and fluorine elements. The compactness ofthe interface film is ensured, the oxidation resistance and the thermal stability of the interface film are improved, and therefore, the high-temperature storage performance and the cycle performanceof the lithium ion battery are remarkably improved.

Description

technical field [0001] The invention relates to the battery field, in particular to an electrolyte solution for a lithium ion battery, a lithium ion battery, a battery module, a battery pack and a device. Background technique [0002] At present, lithium-ion batteries have begun to be widely used in the automotive industry as a power source. As an alternative to fuel vehicles, people have put forward higher requirements for the endurance of lithium-ion batteries. Improving the energy density of lithium-ion batteries can not only improve their battery life, but also reduce the cost per unit of electricity. In order to improve the energy density of lithium-ion batteries, it is one of the effective ways to develop cathode materials for lithium-ion batteries with high specific capacity. Ways to increase energy density include increasing the gram capacity of active materials, reducing the weight of structural parts and auxiliary materials, and high-nickel cathode materials are ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M2/10
CPCH01M10/0567H01M10/0525H01M2300/0028H01M50/20Y02E60/10H01M2300/0025H01M10/0569H01M10/4235H01M4/525H01M50/249H01M50/204H01M2220/20H01M4/505H01M2004/028H01M2300/004
Inventor 李永坤吴凯田少杰
Owner CONTEMPORARY AMPEREX TECH CO
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