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Electrolyte for improving high-temperature property of lithium manganate battery

A lithium manganate battery, high-temperature performance technology, applied in secondary batteries, circuits, electrical components, etc., can solve problems such as capacity attenuation, and achieve the effect of improving cycle life

Active Publication Date: 2015-06-10
RISESUN MENGGULI NEW ENERGY SCIENCE & TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, manganese dissolution is the direct cause of capacity fading at high temperature

Method used

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  • Electrolyte for improving high-temperature property of lithium manganate battery
  • Electrolyte for improving high-temperature property of lithium manganate battery
  • Electrolyte for improving high-temperature property of lithium manganate battery

Examples

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with the examples, and the implementation of the present invention includes but not limited to the following examples of implementation. Some substances in the examples are represented by the abbreviations in brackets after the substance in the summary of the invention.

[0025] The preparation of the electrolyte is carried out in a dry room at 20°C and a dew point of -50°C. The preparation process is as follows: First, mix the solvents in proportion, and after fully stirring, add lithium salt according to the designed formula ratio, and after fully stirring and mixing, add each additive in turn, and then stir and mix evenly to obtain the required electrolyte. The proportioning of concrete comparative example and embodiment is shown in Table 1:

[0026] Table 1 The formula table of the electrolyte comparison sample and the implementation sample (the ratios are all mass percentages)

[0027]

[002...

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Abstract

The invention discloses electrolyte for improving a high-temperature property of a lithium manganate battery, and belongs to the technical field of electrolytes for lithium ion secondary batteries. The electrolyte comprises a nonaqueous organic solvent, lithium salt and a cathode film formation additive; and the electrolyte is characterized by further comprising a cyanophenyl fluoride additive and a fluorocarbon surfactant. In the primary charging process, a layer of protection film is formed on the surface of an anode by cyanophenyl fluoride, the decomposing and gas forming of the electrolyte on the surface of the anode are reduced, the dissolving of Mn<2+> ions in positive active materials can be restrained in subsequent processes of charging and discharging, and the high-temperature property of the lithium manganate battery is improved; and by virtue of adding the fluorocarbon surfactant, the surface tension of the electrolyte of the lithium ion secondary battery is reduced, the adsorption and infiltration of a positive sheet, a negative sheet and a membrane on the electrolyte are effectively improved, the stable and uniform state of the electrolyte in the battery is quickly achieved, and the cycle life of the battery can be prolonged. By utilizing the cyanophenyl fluoride additive and the fluorocarbon surfactant, the lithium manganate battery has an excellent high-temperature cycle property.

Description

technical field [0001] The invention belongs to the technical field of electrolytes for lithium secondary batteries, and in particular relates to an electrolyte for improving the high-temperature performance of lithium manganate batteries. Background technique: [0002] With the intensification of energy shortage and the improvement of human environmental awareness, in order to eradicate the impact of automobile exhaust on the environment, the research and development of electric vehicles has become a problem of concern to the world. However, the biggest bottleneck restricting the development of electric vehicles is the power battery. The power battery should have the following characteristics: 1) high energy and high power; 2) high energy density; 3) good cycle performance, long service life; 4) excellent charge and discharge performance, good ability to prevent overcharge and overdischarge; 5 ) good safety; 6) low cost; 7) friendly to the environment. Lithium-ion secondar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567
CPCY02E60/10
Inventor 杨道均唐宏武吴宁宁刘建红王雅和
Owner RISESUN MENGGULI NEW ENERGY SCIENCE & TECHNOLOGY CO LTD
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