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Low-temperature-resistant lithium ion battery non-aqueous electrolyte and lithium ion battery

A lithium-ion battery and non-aqueous electrolyte technology, which is applied in the field of lithium-ion batteries, can solve the problems of poor low-temperature cycle and room temperature cycle performance, battery cycle diving, and lowering, to overcome temperature stability, reduce reaction, and low impedance Effect

Active Publication Date: 2019-07-05
SHANSHAN ADVANCED MATERIALS QUZHOU CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above-mentioned prior art can greatly improve the low-temperature performance of the battery, there is no good low-temperature film-forming additive in the invention, which will cause the battery to cycle in the later stage, and cannot effectively solve the problem of low-temperature discharge, low-temperature cycle and room temperature cycle performance of the battery. good or bad

Method used

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  • Low-temperature-resistant lithium ion battery non-aqueous electrolyte and lithium ion battery
  • Low-temperature-resistant lithium ion battery non-aqueous electrolyte and lithium ion battery
  • Low-temperature-resistant lithium ion battery non-aqueous electrolyte and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Electrolyte preparation steps: In a glove box filled with argon, ethylene carbonate, propylene carbonate, ethyl methyl carbonate and ethyl propionate are prepared according to the mass ratio of EC:PC:EMC:EP=20:10:10: 60 for mixing, then slowly add 12.5wt% lithium hexafluorophosphate to the mixed solution, and finally add 0.2wt% vinylidene carbonate (VC) based on the total weight of the electrolyte, and 1.0wt% 1,3-propanesulfonate based on the total weight of the electrolyte Acid lactone (PS), 2.0wt% fluoroethylene carbonate (FEC) based on the total weight of the electrolyte and 0.8wt% lithium difluorophosphate (LiPO 2 f 2 ), after stirring uniformly, obtain the lithium-ion battery electrolyte of embodiment 1.

[0032]The prepared lithium-ion battery electrolyte was injected into the fully dried artificial graphite material / lithium cobaltate (4.2V) battery. After the battery was left at 45°C, formed by high-temperature fixtures and sealed twice, it was routinely divided...

Embodiment 2-13

[0033] Embodiment 2-13 and comparative example 1-6

[0034] As shown in Table 1, in Examples 2-13 and Comparative Examples 1-6, except that the composition ratio of the components of the electrolyte solution is added as shown in Table 1, the others are the same as in Example 1.

[0035] Table 1 Embodiment 1-13 and the composition and proportioning ratio of the electrolyte of comparative examples 1-6

[0036]

[0037]

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Abstract

The invention relates to the field of lithium ion batteries, in particular to low-temperature-resistant lithium ion battery non-aqueous electrolyte and a lithium ion battery. The low-temperature-resistant lithium ion battery non-aqueous electrolyte contains electrolyte lithium salt, a non-aqueous organic solvent and a film-forming additive, wherein the film-forming additive contains a conventionalfilm-forming additive and a low-temperature-resistant film-forming additive with a structure of a formula (I); the low-temperature-resistant additive can be reduced into a film on the surface of a negative electrode material more quickly than the solvent, a formed SEI (Solid Electrolyte Interphase) film is low in impedance so as to be favorable for embedding and separating out ions, and therefore, the low-temperature performance of the lithium ion battery can be greatly improved. In addition to a conventional carbonic ester solvent, the non-aqueous organic solvent also contains a carboxylic ester solvent, and the melting point and the viscosity of a whole electrolyte system are greatly lowered. When the battery is under a low-temperature (-40 DEG C) condition, the migration of the lithiumion between a positive electrode and a negative electrode can be guaranteed.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to a non-aqueous electrolyte for a low-temperature resistant lithium-ion battery and a lithium-ion battery. Background technique [0002] Lithium-ion batteries are widely used in 3C digital products, electric vehicles and other fields due to their high operating voltage, wide operating temperature range and environmental friendliness. In the 3C digital field, such as smart phones, mobile power supplies, etc., lithium-ion batteries are becoming lighter and thinner. At the same time, in order to meet certain special use environments, such as military industry or extreme low temperature environments, batteries are required to be able to operate at -40°C Use in low temperature or lower temperature environment requires the battery to have higher low temperature charge and discharge performance or low temperature discharge performance. [0003] Currently commercialized non-aqueous el...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0568H01M10/0569H01M10/0525
CPCH01M10/0525H01M10/0567H01M10/0568H01M10/0569H01M2300/0042Y02E60/10
Inventor 潘立宁钟子坊郭力钟婷婷王建斌
Owner SHANSHAN ADVANCED MATERIALS QUZHOU CO LTD
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