Low temperature type lithium ion battery electrolyte with high temperature property and lithium ion battery

A lithium-ion battery, high-temperature performance technology, applied to secondary batteries, battery pack components, circuits, etc., can solve the problems of poor cycle performance and high-temperature performance, limit the application range of lithium-ion batteries, etc., achieve good low-temperature rate performance, The effect of widening the liquid state range and excellent low-temperature discharge performance

Inactive Publication Date: 2010-10-20
XIAN SAFTY ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the discharge capacity of conventionally used lithium-ion battery electrolyte is only about 80% at -20°C, and basically no electricity can be discharged at -40°C, and most low-temperature electrolytes in the industry only have low-temperature discharge performance. The cycle performance and high temperature performance are poor, which greatly limits the application range of lithium-ion batteries

Method used

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  • Low temperature type lithium ion battery electrolyte with high temperature property and lithium ion battery
  • Low temperature type lithium ion battery electrolyte with high temperature property and lithium ion battery
  • Low temperature type lithium ion battery electrolyte with high temperature property and lithium ion battery

Examples

Experimental program
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Embodiment 1

[0027] In this example, when preparing the electrolyte: first in a glove box with a humidity of less than 1%, mix the solvents ethylene carbonate, methyl formate and methyl ethyl carbonate in a ratio of 1:1:3 by volume Make a non-aqueous organic solvent, then add the corresponding quality of LiBF to the made non-aqueous organic solvent 4 The mixed lithium salt formed by uniform mixing with LiBOB is prepared into a mixed lithium salt solution with a volume of 30ml and a concentration of 1mol / L after uniform mixing, wherein LiBF in the mixed lithium salt 4 The molar ratio with LiBOB is 8: 2; Simultaneously, in described mixed lithium salt solution, add vinylene carbonate (VC) earlier and the mass percent between added VC and the non-aqueous organic solvent that is made into is 2%, Then add heptamethyldisilazane and the mass percentage between the added heptamethyldisilazane and the non-aqueous organic solvent is 1.0%, after the electrolyte salt (i.e. the mixed lithium salt) is f...

Embodiment 2

[0033] In this embodiment, the difference from Example 1 is: when preparing the electrolyte: in a glove box with a humidity of less than 1%, ethylene carbonate, ethyl acetate and methyl ethyl carbonate are mixed in a volume ratio of 1:2 : The ratio of 6 is mixed evenly to make a non-aqueous organic solvent, and then in the non-aqueous organic solvent made, add the corresponding quality of LiBF 4 The mixed lithium salt formed by uniform mixing with LiBOB is prepared into a mixed lithium salt solution with a volume of 30ml and a concentration of 1mol / L after uniform mixing, wherein LiBF in the mixed lithium salt 4 The molar ratio of LiBOB and LiBOB is 9: 1; Simultaneously, in described mixed lithium salt solution, add 1,3-propane sultone (PS) earlier and the mass between the added PS and the non-aqueous organic solvent that is made into The percentage is 2%, then add heptamethyldisilazane and the mass percentage between the added heptamethyldisilazane and the prepared non-aqueou...

Embodiment 3

[0036] In this embodiment, the difference from Example 1 is: when preparing the electrolyte: in a glove box with a humidity of less than 1%, ethylene carbonate, methyl butyrate and methyl ethyl carbonate are mixed in a volume ratio of 1: The ratio of 2:5 was mixed evenly to make a non-aqueous organic solvent, and then the corresponding mass of LiBF was added to the prepared non-aqueous organic solvent 4 The mixed lithium salt formed by uniform mixing with LiBOB is prepared into a mixed lithium salt solution with a volume of 30ml and a concentration of 1mol / L after uniform mixing, wherein LiBF in the mixed lithium salt 4 The molar ratio of LiBOB and LiBOB is 9: 1; Simultaneously, in described mixed lithium salt solution, add gamma-butyrolactone (GBL) earlier and the mass percentage between the added GBL and the non-aqueous organic solvent that is made into is 3% , then add heptamethyldisilazane and the mass percentage between the added heptamethyldisilazane and the prepared non...

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Abstract

The invention discloses a low temperature type lithium ion battery electrolyte with high temperature property and lithium ion battery. The electrolyte is made by uniformly mixing and confecting electrolytic salt, non-water organic solvent, alkali additive and film-forming additive, the electrolytic salt is mixed lithium salt made by uniformly mixing lithium tetrafluoroborate and lithium bis(oxalate)borate, and the mol ratio of the two is 96-73: 4-27, the concentration of the mixed lithium salt solution formed by the electrolytic salt and the non-water organic solvent is 0.8-1.2mol/L; the alkali additive is heptamethyldisilazane and the mass ratio of the hepatmethyldisilazane and the non-water organic solvent is 0.1-8%; the mass ratio of the film-forming additive and the non-water organic solvent is 0.1-5%; and the lithium ion battery comprises an anode, a cathode, a diaphragm and low temperature type lithium ion battery electrolyte with high temperature property. The invention has reasonable design, simple preparation method steps and convenient implementation, and the prepared electrolyte and lithium ion battery have favourable comprehensive performances.

Description

technical field [0001] The invention relates to a lithium-ion battery electrolyte and a lithium-ion battery using the electrolyte, in particular to a low-temperature lithium-ion battery electrolyte and a lithium-ion battery that take into account high-temperature performance. Background technique [0002] Energy crisis, resource shortage and environmental pollution are severe challenges to human existence. Finding clean, renewable and resource-saving secondary energy is one of the urgent tasks for the sustainable development of human society. Lithium-ion batteries are a new generation of green and environmentally friendly batteries developed in the 1990s. They have the characteristics of high voltage, high specific energy, long charge and discharge life, safety, and environmental protection. They have become the leading portable power supply and power supply. As the marketization of lithium-ion batteries continues to deepen, people's expectations for battery performance are ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/056H01M10/0525H01M2/16H01M50/417
CPCY02E60/122Y02E60/10
Inventor 谭晓兰杨洪李峰王宏宇何显峰
Owner XIAN SAFTY ENERGY TECH
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