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A kind of high temperature electrolyte solution for flexible packaging lithium ion battery

A lithium-ion battery and electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve problems such as damage to battery cycle and storage life, electrolyte direct contact with electrode surface, damage to electrode material stability, etc., to prevent Discoloration, prevention of co-embedding, good effect of high temperature cycle life

Active Publication Date: 2017-12-12
WANXIANG 123 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the most widely used electrolyte system for commercial use is the mixed carbonate solution of LiPF6. In this system, LiPF6 is not only easy to hydrolyze, but also easy to be thermally decomposed to generate LiF and PF5 under higher temperature conditions, thereby corroding the current collector. , SEI film and electrode active material, so that the performance of the battery rapidly decays; at the same time, the passivation film (SEI) formed by the electrolyte on the surface of the negative electrode is unstable at high temperature, prone to decomposition and denaturation, causing the electrolyte to directly contact the electrode surface , which will destroy the stability of the electrode material; and will cause continuous decay of battery capacity, seriously impairing the cycle and storage life of the battery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The organic solvent ethylene carbonate (EC), ethyl methyl carbonate (EMC), propylene carbonate (PC) and diethyl carbonate (DEC) that account for 87% by weight are placed in the container and mixed uniformly, then the 13% LiPF 6 Add slowly, stir to make it fully dissolve, finally add the vinylene carbonate (VC) that will account for the sum of the first two in weight percentage of 2.5%, and the fluoroethylene carbonate (FEC) in weight percentage of 4%, the weight percentage is Additives such as 2% vinyl sulfite (ES) and 0.1% by weight of triphenyl phosphite (TPPI) are uniformly mixed to obtain an organic electrolyte.

Embodiment 2

[0020] The organic solvent ethylene carbonate (EC), ethyl methyl carbonate (EMC), propylene carbonate (PC) and diethyl carbonate (DEC) that account for 86% by weight are placed in the container and mixed uniformly, and then the 14% LiPF 6 Slowly add, stir and make it fully dissolve, finally add the vinylene carbonate (VC) that will account for the sum of the first two and the weight percentage is 2%, and the weight percentage is 3% fluoroethylene carbonate (FEC), the weight percentage is Additives such as 1.5% ethylene sulfite (ES), 0.15% by weight triphenyl phosphite (TPPI), 0.5% by weight lithium bisoxalate borate (LiBOB) and the like are uniformly mixed to obtain an organic electrolyte.

Embodiment 3

[0022] The organic solvent ethylene carbonate (EC), ethyl methyl carbonate (EMC), propylene carbonate (PC) and diethyl carbonate (DEC) that account for 85% by weight are placed in the container and mixed uniformly, and then the 15% LiPF 6 Add slowly, stir to make it fully dissolve, finally add the vinylene carbonate (VC) that will account for the sum of the first two in weight percentage of 1.5%, and the fluoroethylene carbonate (FEC) in weight percentage of 5%, the weight percentage is 2.5% ethylene sulfite (ES), 0.2% by weight triphenyl phosphite (TPPI), 0.5% by weight lithium difluorooxalate borate (LiODFB) and other additives, mixed evenly to obtain an organic electrolyte .

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PUM

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Abstract

The invention relates to the technical field of a lithium ion battery material, specifically to a high temperature electrolyte for a soft packing lithium-ion battery. The electrolyte is composed of a main material and a functional additive. The main material is composed of a lithium salt A and an organic solvent B. The lithium salt A accounts for 12-15 wt% of the total amount of the main material; the organic solvent B accounts for 85-88 wt% of the total amount of the main material; and the functional additive accounts for 6-10 wt% of the total amount of the main material. The high temperature electrolyte for the soft packing lithium-ion battery has good high-temperature cycle life.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery materials, in particular to a high-temperature electrolyte solution for a soft-packed lithium-ion battery. Background technique [0002] Due to the advantages of high voltage, high power, and high specific energy, lithium-ion batteries have been developed rapidly in recent years and applied to various fields. However, the applicable temperature range of lithium-ion batteries is narrow, and the battery capacity drops rapidly at higher ambient temperatures (>50°C), and even combustion or explosion may occur, which severely limits its wide application. [0003] As one of the key materials of lithium-ion batteries, electrolyte has an important impact on the performance and cost of batteries. At present, the most widely used electrolyte system for commercial use is the mixed carbonate solution of LiPF6. In this system, LiPF6 is not only easy to hydrolyze, but also easy to be thermally d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0569
CPCH01M10/0525H01M10/0567H01M10/0569Y02E60/10
Inventor 袁园王慧敏严红吕豪杰
Owner WANXIANG 123 CO LTD