Non-aqueous electrolyte of high-temperature resistant lithium ion battery

A lithium-ion battery and non-aqueous electrolyte technology, applied in the field of lithium-ion batteries, can solve problems such as the limit temperature that cannot be commercialized, and achieve the effects of improving long-term cycle performance, reducing reaction, and reducing gasification

Active Publication Date: 2019-04-26
SHANSHAN ADVANCED MATERIALS QUZHOU CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high temperature environment involved in the above two patents failed to reach the limit temperature of commercialization (80°C cycle)

Method used

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  • Non-aqueous electrolyte of high-temperature resistant lithium ion battery
  • Non-aqueous electrolyte of high-temperature resistant lithium ion battery
  • Non-aqueous electrolyte of high-temperature resistant lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Electrolyte solution preparation steps: In a glove box filled with argon, mix ethylene carbonate, propylene carbonate and diethyl carbonate according to the mass ratio of EC:PC:DEC=40:5:55, and then slowly pour into the mixed solution Add 12.5wt% lithium hexafluorophosphate, finally add 1.0wt% vinylene carbonate (VC) based on the total weight of the electrolyte, and 3.5wt% 1,3-propane sultone (1,3-PS) based on the total weight of the electrolyte ), based on the vinyl ethylene carbonate (VEC) of 0.5wt% of the total weight of the electrolyte, the lithium-ion battery electrolyte of Example 1 was obtained after stirring.

[0033] The prepared lithium-ion power battery electrolyte was injected into the fully dried artificial graphite material / lithium cobaltate (4.2V) battery, and after the battery was left at 45°C, formed by high-temperature fixtures and sealed twice, it was routinely divided.

Embodiment 1-10

[0034] Embodiment 1-10 and comparative example 1-5

[0035] As shown in Table 1, in Examples 2-10 and Comparative Examples 1-5, 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.

[0036] Table 1 Embodiment 1-10 and the composition and proportioning ratio of the electrolyte of comparative examples 1-5

[0037]

[0038]

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PUM

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Abstract

The invention discloses a non-aqueous electrolyte for a high-temperature resistant lithium ion battery and relates to the technical field of lithium ion batteries. The non-aqueous electrolyte of the high-temperature-resistant lithium ion battery contains an electrolyte lithium salt, a non-aqueous organic solvent and a film-forming additive, wherein the film-forming additive contains a negative electrode film-forming additive and a high-temperature additive, and the high-temperature additive is one or more of methylene methane disulfonate, 1,3-propane sultone, citraconic anhydride, adiponitrile, succinic anhydride, maleic anhydride, 1-propylphosphonic anhydride and vinyl ethylene carbonate. The non-aqueous electrolyte for the high-temperature resistant lithium ion battery effectively improves high-temperature (85 DEG C) storage performance and high-temperature (80 DEG C) cycle stability of the lithium ion battery. On the basis of the additive and the non-aqueous organic solvent, the high-temperature performance and long cycle performance of the power battery can be improved only the conventional lithium salt LiPF6, the cost is low, and the electrolyte is conductive to industrialization.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a nonaqueous electrolyte solution for high temperature resistant lithium ion batteries. 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 some special use environments, such as military industry or extreme high temperature environment, the battery is required to withstand a high temperature environment or cycle of 80-100 ° C, which requires the battery to have higher high temperature resistance storage capacity and high temperature cycle resistance. [0003] Under high temperature (temperature ≥ 80°C), thermal runaway will occur inside...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M2300/0042H01M2300/0091Y02E60/10
Inventor 潘立宁朱学全刘津宏郭力黄慧聪
Owner SHANSHAN ADVANCED MATERIALS QUZHOU CO LTD
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