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Method for preparing non-aqueous electrolyte suitable for high-energy density lithium ion batteries

A lithium ion battery, non-aqueous electrolyte technology, applied in the field of electrochemistry, can solve the problems of difficult control of the uniformity of the coating layer on the surface of the positive electrode material, the decrease of the specific capacity of the battery, the increase of the production cost, etc., so as to improve the high-voltage cycle performance, The effect of inhibiting oxidative decomposition and reducing flatulence

Inactive Publication Date: 2014-04-16
JIANGXI YOULI NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult to control the uniformity of the coating layer on the surface of the positive electrode material. At the same time, the surface coating will also cause a decrease in the specific capacity of the battery, an increase in the process flow and a substantial increase in production costs.

Method used

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  • Method for preparing non-aqueous electrolyte suitable for high-energy density lithium ion batteries
  • Method for preparing non-aqueous electrolyte suitable for high-energy density lithium ion batteries
  • Method for preparing non-aqueous electrolyte suitable for high-energy density lithium ion batteries

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Embodiment 1 (comparative example):

[0020] In the glove box In the glove box (H 2 O 2 2 >99.99%) to prepare lithium-ion electrolyte: EC:EMC=1:2(wt%), lithium salt concentration is 1M lithium hexafluorophosphate (LiPF 6 ), a total of 200g was packed in a fluorinated bottle, and the electrolyte was used as the electrolyte of the lithium-ion battery, marked as A, and assembled into a battery.

Embodiment 2

[0022] A lithium ion battery electrolyte additive, structural formula is as follows:

[0023] (1)

[0024] Use the preparation method of the electrolyte of above-mentioned additive: in glove box (H 2 O 2 2 >99.99%) to prepare lithium-ion electrolyte: EC:EMC=1:2 (wt%), the concentration of lithium salt is 1M lithium hexafluorophosphate (LiPF6), a total of 200g. After adding 0.5wt% of the additive shown in the structural formula (1), it was packed in a fluorinated bottle, and the electrolyte was used as the electrolyte of the lithium-ion battery, marked as B, and the battery was assembled.

Embodiment 3

[0025] Embodiment 3: a kind of lithium ion battery electrolyte additive, structural formula is as follows:

[0026] (2)

[0027] Use the preparation method of the electrolyte of above-mentioned additive: in glove box (H 2 O 2 2>99.99%) to prepare lithium-ion electrolyte: EC:EMC=1:2 (wt%), the concentration of lithium salt is 1M lithium hexafluorophosphate (LiPF6), a total of 200g. After adding 0.5wt% of the additive shown in the structural formula (2), it was packed in a fluorinated bottle, and the electrolyte was used as the electrolyte of the lithium-ion battery, marked as C, and the battery was assembled.

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Abstract

The invention discloses a method for preparing non-aqueous electrolyte suitable for high-energy density lithium ion batteries and relates to the technical field of electrochemistry. The preparation method comprises the following steps: (a) carrying out reduced pressure distillation, purification and lithiated molecular sieve dehydration on a 80-85wt% of organic solvent in the presence of nitrogen to obtain a refined non-aqueous organic solvent, wherein the purity of the non-aqueous organic solvent is greater than 99.99 and the water content is less than 10ppm; (b) adding 12-15wt% of lithium salt in the purified solvent to make the concentration be 1M and obtain basic electrolyte; (c) adding a 0.01-3wt% of additive A and a 0.1-6wt% of additive B into the electrolyte. The method has the advantages that thiophene, benzothiophene, 2-thiophene formonitrile and 2-methylthiophene are adopted as electrolyte additives, the electrolyte can be electrolyzed on the surface of an electrode to form a compact protective film, surface films of positive and negative electrodes are optimized and the surface activity of the electrodes is inhibited, so that the oxygenolysis of the electrolyte main solvent at high voltage is inhibited, the high voltage cycle performance of the lithium ion batteries is improved and the gas expansion phenomenon is reduced.

Description

technical field [0001] The invention relates to the technical field of electrochemistry, in particular to a method for preparing a non-aqueous electrolyte suitable for high energy density lithium ion batteries. Background technique [0002] Due to its excellent cycle performance, high working potential, environmental friendliness and no memory effect, lithium-ion batteries have quickly occupied the main market of mobile power supplies for portable electronic devices. With consumers' increasing requirements for the portability and durability of electronic products and the application of lithium-ion batteries in new fields such as electric vehicles, hybrid electric vehicles, and smart grids, it is imminent to increase the energy density of lithium-ion batteries. It is well known that increasing the charge cut-off voltage of lithium-ion batteries can effectively increase its reversible specific capacity, thereby achieving the purpose of increasing the energy density of the batt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M10/0567
CPCH01M10/058Y02E60/10Y02P70/50
Inventor 齐爱王超颜果春李雪铖
Owner JIANGXI YOULI NEW MATERIALS
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