Preparation method of lithium difluoro bis (oxalato) phosphate and derivative thereof, electrolyte and secondary battery

A technology of lithium difluorobisoxalate phosphate and lithium bisoxalate phosphate, which is applied in the field of secondary battery materials, lithium difluorobisoxalate phosphate derivatives and its preparation, and the preparation of lithium difluorobisoxalate phosphate, which can solve the problem of chloride ion concentration High free acid and other problems, to achieve the effect of high atom economy, environmental friendliness, and good industrial application prospects

Pending Publication Date: 2021-11-30
EVERGRANDE NEW ENERGY TECH SHENZHEN CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The object of the present invention is to provide a preparation method of lithium difluorobisoxalate phosphate, a derivative of lithium difluorobisoxalate phosphate and its preparation method, an electrolyte addit

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  • Preparation method of lithium difluoro bis (oxalato) phosphate and derivative thereof, electrolyte and secondary battery
  • Preparation method of lithium difluoro bis (oxalato) phosphate and derivative thereof, electrolyte and secondary battery
  • Preparation method of lithium difluoro bis (oxalato) phosphate and derivative thereof, electrolyte and secondary battery

Examples

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Example Embodiment

[0033] Embodiments of the present invention provide a method for preparing lithium difluoroalkanate, including the steps of:

[0034] S1, providing lithium oxalic acid, lithium hexafluorophosphate, non-aqueous solvent and organic aid;

[0035] S2, in a non-aqueous solvent, lithium oxalic acid, hexafluorophosphate is mixed with an organic aid to obtain a solution of lithium phosphate acid phosphate acid.

[0036] S3, solution of lithium phosphate containing diofluorocyanrate is concentrated to give lithium phosphate phosphate.

[0037]Embodiment of the present invention process for producing lithium difluoro bis (oxalato) phosphate embodiment provided and mixed by the addition of organic additives and oxalic acid and lithium hexafluorophosphate can make otherwise poor solubility in non-aqueous solvent oxalic acid gradually dissolved to give containing titanium liquid lithium bis (oxalato) phosphate fluoride, and then concentrated and dried to give lithium bis (oxalato) phosphate, d...

Example Embodiment

[0110] Example 1

[0111] This embodiment provides a method of preparation of LIDODFP, including the following steps:

[0112] (11) 36 g of oxalic acid and a methane of dimethyl carbonate were added to 500 ml of two bottles, and the solid was not completely dissolved at room temperature, and then 30.4 g of LiPF 6 The 80ml carbonate solution was added to the two flasks, and the stirring system was suspected, and 95 g me 3 SiCl (ME represents methyl) 50 ml carbonate solution is added to the two flask by a dropping funnel, and the dropping acceleration is 1 drop / second, and the gas is released in the dripping process and the insoluble matter is gradually dissolved. The latter insoluble matter is completely dissolved, the solution is a colorless transparent, and stirring at room temperature for 3 h then warmed to 50 ° C, and there is a large amount of HCl gas release, and the temperature is 50 ° C to react 3 h. The HCl gas produced by the reaction was absorbed by sodium hydroxide sa...

Example Embodiment

[0114] Example 2

[0115] This embodiment provides a method of preparation of LIDODFP, including the following steps:

[0116] (21) 36 g of oxalic acid and 100 ml of dimethyl carbonate were added to 500 ml of two bottles, and the solid was stirred at room temperature and was not completely dissolved, and then 30.4 g of LiPF 6 The 80ml carbonate solution was added to the two flasks, and the stirring system was suspected, and 95 g me 3 SiCl's 50 ml carbonate solution was added to the two flask by a dropping funnel, and the drip acceleration was controlled by 1 drop / second. The gas released during the dropwise addition and the insoluble matter gradually dissolved. After all the drops were completed, the insoluble material was completely dissolved. The solution was a colorless transparent, and the stirring was continued for 3 h at room temperature and then warmed to 50 ° C, and there was a large amount of HCl gas released, and the temperature was 50 ° C for 3 h. The HCl gas produced...

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Abstract

The invention belongs to the technical field of secondary battery materials, and particularly relates to a preparation method of lithium difluoro bis (oxalato) phosphate and a derivative thereof, an electrolyte and a secondary battery. In the preparation method of the lithium difluoro-bis (oxalate) phosphate and the derivative thereof, all reactants are organic matters, the solvent is a non-aqueous solvent, the lithium difluoro-bis (oxalate) phosphate and the derivative thereof with high purity can be obtained through concentration and drying, the problems of high chloride ion concentration and high free acid are avoided, and in the reaction process, the atom economy is high, the impurities are few, reaction raw materials do not need to be synthesized in advance, HF does not need to be added, the reaction process is simplified, the production cost is saved, meanwhile, the safety of the reaction process is improved, and the method is more environmentally friendly. The lithium difluoro bis (oxalate) phosphate and the derivative thereof are prepared by adopting a similar method so that the equipment investment, the labor cost and the energy consumption are reduced, and the method has a good industrial application prospect.

Description

technical field [0001] The invention belongs to the technical field of secondary battery materials, and in particular relates to a preparation method of lithium difluorobisoxalate phosphate, a lithium difluorobisoxalate phosphate derivative and a preparation method thereof, an electrolyte additive, an electrolyte, and a secondary battery. Background technique [0002] Lithium-ion battery is a new type of high-energy secondary battery developed in the 1990s. It has excellent performances such as high energy density, small size, light weight, fast discharge rate, low self-discharge rate, long cycle life, and no memory effect. Products, power, and energy storage fields are widely used. [0003] With the continuous development of social needs, the service life, high and low temperature performance, safety performance, and rate performance of lithium-ion batteries can no longer meet the requirements of power battery development. There are many ways to improve the performance of...

Claims

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Application Information

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IPC IPC(8): C07F9/6574H01M10/0567H01M10/0566
CPCC07F9/65748H01M10/0567H01M10/0566H01M2300/0025Y02E60/10
Inventor 时迎华赵文文
Owner EVERGRANDE NEW ENERGY TECH SHENZHEN CO LTD
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