a non-aqueous electrolyte

A non-aqueous electrolyte, structural technology, applied in the field of new materials and electrochemistry, can solve the problems of accelerated side reactions between electrolyte and electrodes, electrolyte leakage of battery flammability, battery expansion and deformation, etc., to achieve redox resistance. Strong, improve high voltage resistance performance, good compatibility effect

Active Publication Date: 2019-04-23
武汉市瑞华新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At high temperature, the reactivity of the positive and negative electrodes of the battery is further enhanced, and the side reaction speed between the electrolyte and the electrodes is accelerated, resulting in the decomposition of the electrolyte to generate a large amount of gas, which causes the battery to expand and deform and cause damage to electrical appliances
In severe cases, due to battery expansion and deformation, a short circuit occurs inside the battery or the battery package bursts, resulting in flammable electrolyte leakage, which may cause fire and other safety accidents.

Method used

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Examples

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Effect test

Embodiment 1

[0015] 1) Fabrication of positive electrode: LiCoO 2 Powder, carbon black (particle size 1000nm), polyvinylidene fluoride (PVDF) and N,N-dimethylpyrrolidone (NMP) are mixed to make a uniform slurry, and the slurry is evenly coated on an aluminum foil (15 μm) current collector on, then dried and rolled to obtain LiCoO 2 Cathode material. Bake at 120°C for 12 hours, in the dried pole piece, LiCoO 2 Accounting for 94% of the total coating, the binder accounted for 4%, and carbon black accounted for 2%. Then the obtained pole piece was cut into a disc with a diameter of 12 mm as the positive pole.

[0016] 2) Preparation of negative electrode: Mix artificial graphite, polyvinylidene fluoride (PVDF) and N,N-dimethylpyrrolidone (NMP) to make a uniform slurry, and evenly coat the slurry on a copper foil (15 μm) set fluid, then dried and rolled to obtain a carbon negative electrode material. Bake at 120°C for 12 hours. In the dried pole piece, graphite accounts for 96.4% of the t...

Embodiment 3

[0026] 12 parts, 7 parts of lithium oxalate phosphate, LiN(SO 2 R F ) 2 5 parts, 4 parts of 1,4-butanediol sulfate, 11 parts of adiponitrile, 20 parts of pimelonitrile, 13 parts of suberonitrile, 16 parts of sebaconitrile, 4-fluoro-1,3-dioxolane 51 parts of cyclo-2-ketone, 8 parts of ethylene carbonate (EC), 5 parts of propylene carbonate (PC), 5 parts of dihydroxystyrene carbonate, 7 parts of monohydroxystyrene carbonate, 4 parts of anti-overshoot additive , 1.3 parts of tributyl phosphate, 2 parts of hexamethyldisilazane or triphenyl phosphite;

[0027] Assembled into the same battery as in Example 1, the high-temperature cycle performance test was carried out. Test conditions: The assembled battery is directly subjected to a high-temperature cycle test in a constant temperature test box at 60°C, and the cut-off voltage is 4.2–2.75V. The charge rate is 0.5C, and the discharge rate is 0.2C. The test data of this embodiment is shown in Table 1.

[0028] The electrolyte...

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Abstract

The invention discloses a non-aqueous electrolyte. The non-aqueous electrolyte comprises the following constituents based on mass: 10-20 parts of compound shown in structural formula (I), 5-12 parts of other lithium salts, 2-5 parts of 1,4-butanediol sulphate, 10-12 parts of adiponitrile, 15-25 parts of pimelicdinitrile, 10-15 parts of octanedinitrile, 8-20 parts of sebaconitrile, 20-40 parts of 4-fluorine-1,3-dioxolane-2-ketone, 5-10 parts of ethylene carbonate, 2-5 parts of propylene carbonate, 5-12 parts of fluoroethylene carbonate, 4-8 parts of carbonated hydroxybenzene olefin ester, 3-5 parts of overshoot resistant additive, 0.5-1.5 parts of flame retardant agent and 1-2 parts of hexamethyl disilazane or triphenyl phosphate. The lithium salts containing oxalate radial groups also can form a solid-state electrolyte membrane on the surface of a positive electrode, the high-voltage resistant performance of a battery can be improved; and the lithium salts containing the oxalate radial groups are friendly to an environment, and the environment cannot be polluted due to the electrolyte problem during disassembly and recycle of the battery.

Description

technical field [0001] The invention belongs to the technical field of new materials and electrochemistry, and in particular relates to a non-aqueous electrolytic solution. Background technique [0002] Lithium-ion batteries are famous for their high specific energy, no pollution, no memory effect, and long life. In recent years, lithium-ion batteries have attracted much attention and been promoted and applied. As small as electronic watches and mobile phones, as large as electric bicycles and automobiles, they are very popular. Even in military and aerospace fields, lithium-ion batteries are becoming more and more popular. Lithium-ion batteries have profoundly affected people's daily life and work. [0003] Both the positive and negative electrodes of lithium-ion batteries have high activity. For charged lithium-ion batteries, the negative electrode has high reducibility, and the positive electrode has high oxidative property. Without the protection of film-forming additi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0568
CPCH01M10/0568H01M2300/0025Y02E60/10
Inventor 陈瀚林陈世忠
Owner 武汉市瑞华新能源科技有限公司
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