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Electrolytic solution for high-temperature high-magnification type lithium ion battery

A lithium-ion battery, electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problem of high resistance value of SEI film, and achieve the effect of excellent cycle performance

Inactive Publication Date: 2014-01-22
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main reason is that the resistance value of the SEI film formed in the carbonate solvent is relatively high.

Method used

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  • Electrolytic solution for high-temperature high-magnification type lithium ion battery
  • Electrolytic solution for high-temperature high-magnification type lithium ion battery

Examples

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Embodiment 1

[0013] In this embodiment, the configuration process of the electrolyte is as follows: in an argon atmosphere, mix DEC and SL at a ratio of 1:1 by volume, and then add LiBOB to the mixed organic solvent to make a mass molar concentration of 0.5 mol / kg lithium salt solution, and then add LiBSO with a mass ratio of 10% 4 f 2 , after the additives are completely dissolved and mixed evenly, the electrolyte required by the invention can be prepared.

Embodiment 2

[0015] In this embodiment, in this embodiment, the configuration process of the electrolyte is as follows: in an argon atmosphere, mix GBL and DMS according to a volume ratio of 1:1, and then add LiBOB to the mixed organic solvent to form A lithium salt solution with a mass molar concentration of 1.2 mol / kg, and then adding LiBSO with a mass ratio of 3% 4 f 2 , after the additives are completely dissolved and mixed evenly, the electrolyte required by the invention can be prepared.

Embodiment 3

[0017] In this embodiment, in this embodiment, the configuration process of the electrolyte is as follows: in an argon atmosphere, mix GBL, SL, and EMC according to a volume ratio of 1:1:2, and then add to the mixed organic solvent LiBOB, made into a lithium salt solution with a mass molar concentration of 0.7 mol / kg, and then adding LiBSO with a mass ratio of 8% 3 f 2 , after the additives are completely dissolved and mixed evenly, the electrolyte required by the invention can be prepared.

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Abstract

The invention discloses electrolytic solution for a high-temperature high-magnification type lithium ion battery. The electrolytic solution comprises an aprotic organic solvent, basic electrolyte lithium salt and a functional additive, wherein the aprotic organic solvent is one substance or a mixture of more of common carbonic ester, sulfite and sulfone compound and the like; the basic electrolyte lithium salt is 0.5-1.2mol / L of double-oxalate lithium borate or lithium difluoroborate or a mixture of the double-oxalate lithium borate and the lithium difluoroborate; the functional additive is sulfate difluoro lithium borate or sulfite difluoro lithium borate or a mixture of the sulfate difluoro lithium borate and the sulfite difluoro lithium borate. The electrolytic solution disclosed by the invention has the advantages that by optimization of components of the electrolytic solution, the electrical conductivity and the thermal decomposition temperature of the electrolytic solution are improved, the impedance of a solid electrolyte interfacial film formed by the electrolytic solution on the surface of the electrolyte material is greatly reduced, and further the high-temperature performance and the rate performance of the battery are improved.

Description

technical field [0001] The invention relates to an electrolyte solution for a high-temperature high-rate lithium-ion battery, in particular to an electrolyte solution for a lithium-ion battery suitable for charging and discharging at a high rate and working normally in a high-temperature environment, and belongs to the field of battery materials . Background technique [0002] Lithium-ion batteries have many advantages and are one of the fastest-growing battery systems in recent years. Electrolyte, as an important part of lithium-ion batteries, greatly affects the electrochemical performance and safety performance of lithium-ion batteries. [0003] At present, the lithium-ion batteries that have been practically used generally use LiPF as the aprotic electrolyte. 6 As the basic electrolyte lithium salt, aprotic organic solvents are mostly cyclic carbonates (such as ethylene carbonate (EC), propylene carbonate (PC)) and chain carbonates (such as dimethyl carbonate (DMC), di...

Claims

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Application Information

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IPC IPC(8): H01M10/056
CPCH01M10/0525H01M10/0567H01M10/0568H01M10/0569Y02E60/10
Inventor 李世友李晓鹏崔孝玲赵伟张宏明李永立刘金良净洁李玲霞薛宇宙
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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