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Electrolyte containing lithium phosphoimide and battery using electrolyte

A technology of lithium phosphoramidide and lithium fluorophosphorimide, which is applied in the field of electrolytes containing lithium phosphoramidite, can solve problems such as limit value and poor solubility of lithium difluorophosphate, and achieve the goal of overcoming poor solubility and good Solubility performance and safety improvement effect

Active Publication Date: 2018-11-13
常德市大度新材料有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lithium difluorophosphate is the most common compound of this type of additive, but lithium difluorophosphate has extremely poor solubility in carbonate electrolytes, especially chain carbonates with relatively low polarity and donor numbers. The solubility is generally less than 0.1%, which greatly limits its application

Method used

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  • Electrolyte containing lithium phosphoimide and battery using electrolyte
  • Electrolyte containing lithium phosphoimide and battery using electrolyte
  • Electrolyte containing lithium phosphoimide and battery using electrolyte

Examples

Experimental program
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Effect test

Embodiment 1

[0022] (1) Preparation of electrolyte

[0023] in an argon atmosphere glove box (H 2 O6 (1.0M) mix, add 1% of the total weight of VC (vinylene carbonate), 0.5% of PS (propane sultone), 2% of FEC (fluoroethylene carbonate), 2% of SN (butylene carbonate) dinitrile), 1% lithium (difluorophosphoryl)(pentafluorobenzenesulfonyl)imide. The above-mentioned raw materials are added in sequence, fully stirred evenly, and the lithium secondary battery electrolyte (free acid<15ppm, moisture<10ppm) of the present invention is obtained.

[0024] (2) Preparation of positive pole piece

[0025] Dissolve 3% polyvinylidene fluoride (PVDF) in 1-methyl-2-pyrrolidone solution, 94% LiCoO 2 and 3% conductive agent carbon black were added to the above solution and mixed evenly, and the mixed slurry was coated on both sides of the aluminum foil, dried and rolled to obtain a positive electrode sheet. Other cathode materials LiMn 2 o 4 、LiFePO 4 、LiNi 0.5 co 0.3 mn 0.2 、LiNi 0.3 co 0.3 mn 0....

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Abstract

The invention discloses an electrolyte containing lithium phosphonide. The electrolyte containing lithium phosphonide comprises conductive lithium salt, a non-aqueous organic solvent and an additive,wherein the additive comprises lithium fluorophosphorimide, and the structural general formula of lithium fluorophosphate is as shown in the formulae (I) and (II), wherein the formula (I) is lithium difluorophosphoryl sulfonamide; the formula (II) is difluorophosphoryl pentafluorophosphoronitrile lithium; R1, R2, R3, R4 and R5 are H, CxHy, CN, F and CxFyHz, x is equal to 1 to 6, y is equal to 1 to15, and z is equal to 1 to 15. In the electrolyte of the invention, due to strong electron-withdrawing effects and electron shielding effects of phosphoryl (sulfonyl) groups, anions have negative charge dispersion and good structural flexibility and exhibit weak coordination properties, to effectively improve the conductivity, dissociation constants, and the lithium ion transference number of theelectrolyte; and lithium phosphoimide with a weak coordination structure has good solubility in the organic solvent and overcomes the disadvantages of poor solubility of widely used lithium difluorophosphate.

Description

technical field [0001] The invention relates to the field of lithium secondary batteries, and more specifically, the invention relates to an electrolyte solution containing lithium phosphoramidite and a lithium secondary battery using the electrolyte solution. Background technique [0002] Non-aqueous electrolyte is one of the key materials for energy storage devices such as high specific energy lithium-ion batteries, and its comprehensive properties, such as chemical and electrochemical stability, safety, etc., directly affect the use of lithium-ion batteries. At present, commercial lithium-ion battery electrolytes are mainly composed of organic carbonates, such as ethylene carbonate (EC), dimethyl carbonate (DMC), diethyl carbonate (DEC), etc., electrolyte conductive salts (mainly LiPF6), Functional additives, such as vinylene carbonate (VC), 1,3-propane sultone (PS), fluoroethylene carbonate (FEC), etc. The electrolyte solvent system mainly adjusts the formula ratio, and...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/42H01M10/052H01M10/0525
CPCH01M10/052H01M10/0525H01M10/0567H01M10/4235Y02E60/10
Inventor 韩鸿波赤骋黄宝陵董金祥罗乾
Owner 常德市大度新材料有限公司
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