Preparation method of high-voltage lithium-ion battery

A lithium-ion battery, high-voltage technology, used in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, battery electrodes, etc., can solve problems such as poor conductivity, achieve the effect of improving conductivity, wide application prospects, and avoiding direct contact

Inactive Publication Date: 2011-04-20
NANKAI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Simultaneously pure phase LiCoPO 4 Cathode materials have their own shortcomings such as poor conductivity, carbon-coated LiCoPO 4 Cathode material is a very important way to improve its electrical conductivity and improve its electrochemical performance

Method used

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  • Preparation method of high-voltage lithium-ion battery
  • Preparation method of high-voltage lithium-ion battery
  • Preparation method of high-voltage lithium-ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1) Pure phase LiCoPO 4 Preparation of cathode material:

[0025] 0.01 mol LiNO 3 , 0.01 mol Co(NO 3 ) 2 ·6H 2 O and 0.02 mol C 6 h 8 o 7 ·H 2 O was dissolved in 40ml deionized water and stirred for 30 minutes, then 0.01 mol (NH 4 ) 2 HPO 4 Add dropwise to the above mixed solution and stir for 3 hours; then heat the solution continuously in a constant temperature water tank at 85°C until a gel is formed, dry the gel in an oven at 100°C for 12 hours, take it out and grind it at 600°C C was directly calcined under air atmosphere for 8 hours to obtain pure phase LiCoPO 4 Cathode material.

[0026] 2) Preparation of electrolyte solution with additives:

[0027] In a glove box with a high-purity argon atmosphere, 1.0 M LiFP 6 - Add 0.1 % and 0.5 % thiophene (TPN) additives to EC / DMC / EMC, stir until uniform, and obtain the optimized electrolyte.

[0028] LiCoPO 4 , conductive agent, and binder (PTFE) were mixed at a mass ratio of 75:20:5, pressed into a circula...

Embodiment 2

[0030] 1) Carbon-coated cathode composite material LiCoPO 4 Preparation of / C

[0031] 0.01 mol LiNO 3 , 0.01 mol Co(NO 3 ) 2 ·6H 2 O and 0.02 mol C 6 h 8 o 7 ·H 2 O was dissolved in 40ml deionized water and stirred for 40 minutes, then 0.01 mol (NH 4 ) 2 HPO 4 It was added dropwise to the above mixed solution and stirred for 3 hours. Then the solution was continuously stirred and heated in a constant temperature water bath at 85°C until a gel was formed, and the gel was dried in an oven at 100°C for 12 hours.

[0032] After the xerogel was ground, it was pre-fired in a tube furnace at 350 °C under an argon atmosphere for 2 hours. The calcined product was taken out and ground, then pressed into tablets at 20 MPa, and heated in a microwave oven for 11 minutes. Finally, the product was calcined in an air atmosphere at 500°C for 4 hours to remove a large amount of carbon, and finally LiCoPO with a network structure was obtained. 4 / C composite material, elemental an...

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Abstract

The invention relates to a preparation method of a high-voltage lithium-ion battery. The lithium-ion battery is assembled and prepared by using a conventional method, a cathode material is a carbon-coated cathode composite material LiCoPO4 / C, an anode material is lithium or carbon, an electrolyte is a conventional organic electrolyte added with an additive which is one of thiophene, biphenyl and furan or the combination of more than two in any proportions, and the additive consumption is 0.05-2 percent by weight of the conventional organic electrolyte. The invention has the advantages that (1) a uniform conductive film can be formed on the particle surface of a material by coating carbon on the high-voltage cathode material to benefit the embedment and the separation of lithium ions, and (2) the action of additives, such as the thiophene, and the like, ensures the stability of the electrolyte component. The method has simple process, is easy for industrialization, greatly improves the electrochemical performance of the ion battery by modifying the cathode material and optimizing the electrolyte and has wide application prospects in the field of the lithium-ion battery of a power type.

Description

technical field [0001] The invention relates to a preparation technology of a lithium ion battery, in particular to a preparation method of a high voltage lithium ion battery. Background technique [0002] With the rapid development of the battery industry, lithium-ion batteries have begun to move into the field of power vehicles. The lithium-ion cathode material is a key factor limiting the development of lithium-ion power batteries, which directly affects the energy density and specific power of the battery. Currently LiFePO 4 Due to its high safety, good high temperature resistance and superior cycle performance, it has broad application prospects in the field of power batteries. But its discharge platform (3.4V) is lower, resulting in a lower energy density of the battery (580 Wh kg -1 ). In order to obtain lithium-ion batteries with higher energy density and specific power, LiNi with a higher discharge platform (4.0-5.0V) x mn (2-x) o 4 、LiMnPO 4 、LiCoPO 4 , Li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M4/139H01M10/0567
CPCY02E60/122Y02E60/12Y02E60/10Y02P70/50
Inventor 魏进平邢丽英周震胡梦秦杏
Owner NANKAI UNIV
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