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Lithium ion battery and gel electrolyte and preparation method thereof

A gel electrolyte, lithium-ion battery technology, applied in the field of lithium-ion batteries, can solve problems such as poor compatibility, achieve good compatibility, and improve the effect of working voltage

Active Publication Date: 2013-12-18
CONTEMPORARY AMPEREX TECH CO +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, also due to the high reduction potential of ionic liquids, this gel electrolyte is poorly compatible with low-potential anode materials.

Method used

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  • Lithium ion battery and gel electrolyte and preparation method thereof

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preparation example Construction

[0032] The preparation method of the lithium ion battery according to the third aspect of the present invention is used to prepare the lithium ion battery according to the second aspect of the present invention, comprising the step of dissolving the corresponding polymer and lithium salt in the organic plasticizer respectively In the solvent solution, the slurry for the positive electrode gel electrolyte layer is prepared; the slurry for the positive electrode gel electrolyte layer is coated on the positive electrode sheet 1 containing the positive electrode active material to form the positive electrode gel electrolyte layer 31, and then protected Drying treatment under atmosphere to obtain a composite of the positive electrode gel electrolyte layer 31 and the positive electrode sheet 1; respectively dissolving the corresponding polymer and lithium salt in an organic solvent solution of a plasticizer to prepare a slurry for the negative electrode gel electrolyte layer ; The ne...

Embodiment 1

[0039] Preparation of lithium-ion battery positive electrode sheet: Lithium cobalt oxide (30g) used as positive electrode active material, acetylene black (1g) used as conductive agent, polyvinylidene fluoride (PVDF, 3g) and methylpropylpyridine difluoride Sulfonimide salt (PP13-FSI, 10 mL) was fully dispersed in nitrogen methyl pyrrolidone (NMP, 100 mL) to prepare positive electrode slurry. The slurry was applied to both sides of a 15 μm thick aluminum foil, and the solvent was removed by blowing at 80° C. for 5 hours to obtain a positive electrode sheet coated with an active material with a thickness of 80 μm. Polyvinylidene fluoride (PVDF, 3g) was dissolved in plasticizer methylpropylpyridine bisfluorosulfonimide salt (PP13-FSI, 10mL) and lithium salt lithium hexafluorophosphate (LiPF 6 , 10g) in tetrahydrofuran (100mL) solution to prepare a positive electrode gel electrolyte slurry with a viscosity of 30000mPa.s; apply the positive electrode gel electrolyte slurry to the s...

Embodiment 2

[0047] Preparation of positive electrode sheet for lithium ion battery: LiNi used as positive active material 1 / 3 co 1 / 3 mn 1 / 3 o 2 (25g), acetylene black (1g) used as a conductive agent, polyacrylonitrile (PAN, 1.8g) and methylpropylpyridine bistrifluoromethylsulfonimide salt (PP13-TFSI, 10mL) were fully dispersed in The positive electrode slurry was prepared in nitrogen methyl pyrrolidone (NMP, 80 mL). The slurry was applied to both sides of a 15 μm thick aluminum foil, and the solvent was removed by blowing at 80° C. for 5 hours to obtain a positive electrode sheet coated with a 70 μm thick active material. Dissolve polyacrylonitrile (PAN, 1.8 g) in plasticizer methylpropylpyridine bistrifluoromethylsulfonimide salt (PP13-TFSI, 10 mL) and lithium salt lithium bistrifluoromethylsulfonimide (LiN(CF 3 SO 2 ) 2 , 7.2g) in ethyl acetate (70mL) solution to prepare a positive electrode gel electrolyte slurry with a viscosity of 40000mPa.s; apply the positive electrode gel e...

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Abstract

The invention provides a lithium ion battery and gel electrolyte and a preparation method of the lithium ion battery. The gel electrolyte of the lithium ion battery is arranged between a positive electrode piece and a negative electrode piece and comprises a positive electrode gel electrolyte layer and a negative electrode gel electrolyte layer, wherein one side of the positive electrode gel electrolyte layer is adjacently connected with the positive electrode piece, the positive electrode piece is provided with a high-potential positive electrode active material, and the oxidation potential of the positive electrode gel electrolyte layer is above 4.5V (vs Li / Li+); one side of the negative electrode gel electrolyte layer is adjacently connected with the negative electrode piece, and the other side of the negative electrode gel electrolyte layer is adjacently connected with the other side of the positive electrode gel electrolyte layer; the negative electrode piece has a low-potential negative electrode active material, and the reduction potential of the negative electrode gel electrolyte layer is below 0.2V (vs Li / Li+). The gel electrolyte of the lithium ion battery can improve the compatibility of the gel electrolyte and the positive and negative electrode pieces, can effectively improve the working voltage and can prolong the cycle life of the lithium ion battery.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a lithium ion battery, a gel electrolyte thereof and a preparation method thereof. Background technique [0002] Due to its long service life, high energy density and working voltage, lithium-ion batteries have been widely used in consumer electronics products such as notebook computers, smart phones, and digital cameras in recent years. However, with the miniaturization and intelligent development of these electronic products, the energy density of lithium-ion batteries has been put forward higher requirements. [0003] Improving the working voltage of lithium-ion batteries is one of the most effective ways to increase the energy density of lithium-ion batteries. However, due to the low oxidation decomposition potential (about 4V) of the traditional carbonate electrolyte, the working voltage of the lithium-ion battery assembled with it is strictly limited. Even if some ele...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/0525H01M10/058
CPCY02E60/10Y02P70/50
Inventor 黄世霖洪响钟开富王宝君闫传苗申兰耀湛英杰
Owner CONTEMPORARY AMPEREX TECH CO
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