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Electrolyte for lithium manganate battery

A lithium manganese oxide battery and electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of fast capacity decay, cycle performance and storage performance deterioration

Active Publication Date: 2015-03-25
RISESUN MENGGULI NEW ENERGY SCIENCE & TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But spinel LiMn 2 o 4 Rapid capacity decay, especially in high temperature environments above 55°C, its cycle performance and storage performance deteriorate sharply

Method used

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  • Electrolyte for lithium manganate battery
  • Electrolyte for lithium manganate battery
  • Electrolyte for lithium manganate battery

Examples

Experimental program
Comparison scheme
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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 a lithium manganate battery, and belongs to the technical field of electrolytes for lithium ion secondary batteries. The electrolyte comprises a nonaqueous organic solvent, a lithium salt and a cathode film formation additive; and the electrolyte is characterized by further comprising a fluorocarbon surfactant and a cyanophenyl fluoride additive. 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; and in the primary charging process, a layer of protection film is formed on the surface of an anode by the 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. By virtue of adding the fluorocarbon surfactant and the cyanophenyl fluoride additive, 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, in particular to an electrolyte for lithium manganate batteries. Background technique [0002] With the global energy shortage and the continuous deterioration of environmental conditions, replacing traditional vehicles with high energy consumption and serious pollution with clean energy electric vehicles has become the main development direction of the future vehicle industry. Lithium-ion batteries are widely used in pure electric vehicles (BEV), hybrid electric vehicles (HEV) and plug-in hybrid electric vehicles (PHEV) due to their unique advantages such as high operating voltage, high specific capacity, high energy density, and long cycle life. middle. Among the cathode materials for lithium-ion batteries, spinel-type LiMn is more studied. 2 o 4 、LiCoO 2 , LiNiO 2 、LiFePO 4 and ternary materials. Cobalt resources are limited, the price is relatively ...

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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