Fast-charging lithium ion battery, cathode material thereof and preparation method of cathode material

A technology of lithium-ion batteries and negative electrode materials, applied in the direction of battery electrodes, batteries, secondary batteries, etc., can solve the problems of high power density, high capacity density, long cycle life, high capacity, long life electronic equipment, and constraints Lithium-ion battery capacity and other issues, to achieve the effect of ultra-fast charge and discharge capacity, enhanced electrochemical performance, and good mechanical stability

Active Publication Date: 2016-11-09
SHANGHAI UNIV OF ENG SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current commercial lithium-ion battery with graphite as the negative electrode material has a low theoretical specific capacity (372mAh / g), which restricts the improvement of the capacity of lithium-ion batteries and cannot meet the needs of future high-capacity and long-life electronic equipment. At present, new carbon anode materials that can replace graphite have been studied by more and more scholars.
Nitrogen-doped carbon as a negative electrode material can achieve high charge and discharge rates, but under continuous high current density charge and discharge, there are problems of low capacity and short cycle life, which cannot meet the requirements of high power density, high capacity density, and cycle life. The need for long life and ultra-fast charging and discharging

Method used

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  • Fast-charging lithium ion battery, cathode material thereof and preparation method of cathode material
  • Fast-charging lithium ion battery, cathode material thereof and preparation method of cathode material
  • Fast-charging lithium ion battery, cathode material thereof and preparation method of cathode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Weigh 0.15g of zinc germanate nanorod templates with an average length of 480nm and an outer diameter of 65nm, disperse them in a mixed solution of 20ml ethanol and 15ml water, weigh 0.23g of dopamine hydrochloride, add them to the above solution, and then add 0.05g tris(hydroxymethyl)aminomethane and 10ml water, stirred at room temperature for 20h. After centrifugation, cleaning, and drying, put the dried sample into a tube furnace, first pass in argon to remove the air, continue to pass in argon, then heat up to 550°C, carbonize for 4 hours, and finally cool to room temperature with the furnace After sampling, the precursor is obtained. Next, 0.2 g of the precursor was weighed and soaked in 80 mL of aqua regia, and after standing still for 1 day, it was centrifuged, washed, and dried to obtain the negative electrode material of the lithium ion battery.

[0036] The negative electrode material was tested by transmission electron microscopy, and the results were as fol...

Embodiment 2

[0040] Weigh 0.15g of the zinc germanate nanorod template with an average length of 480nm and a diameter of 65nm, and disperse it into a mixed solution of 20mL of ethanol and 15mL of water, and weigh 0.075g of dopamine hydrochloride, add it to the above solution, and then add 0.05g of tris(hydroxymethyl)aminomethane, and 10mL of water, stirred at room temperature for 20h, centrifuged, washed, and dried, put the dried sample into a tube furnace, first pass in argon to remove the air, and continue Introduce argon, then raise the temperature to 550°C, and carbonize for 4h. Finally, samples were taken after the furnace was cooled to room temperature to obtain the precursor; then 0.2 g of the precursor was weighed and soaked in 80 mL of aqua regia, and after standing for 1 day, it was centrifuged, washed and dried to obtain the negative electrode material.

[0041] The obtained lithium ion battery negative electrode material is mixed with binder vinylidene fluoride (PVDF) and condu...

Embodiment 3

[0043] Weigh 0.15g of the copper germanate nanorod template with an average length of 900nm and a diameter of 40nm, and disperse it into a mixed solution of 20mL ethanol and 15mL water, and weigh 0.23g of dopamine hydrochloride, add it to the above solution, and then add 0.05g of tris(hydroxymethyl)aminomethane, and 10mL of water, stirred at room temperature for 20h, centrifuged, washed, dried, put the dried sample into a tube furnace, first pass in argon to remove the air, continue Introduce argon, then raise the temperature to 550°C, and carbonize for 4h. Finally, samples were taken after the furnace was cooled to room temperature to obtain the precursor; then 0.2 g of the precursor was weighed and soaked in 80 mL of aqua regia, and after standing for 1 day, it was centrifuged, washed and dried to obtain the negative electrode material.

[0044] The lithium-ion battery negative electrode material obtained in this embodiment is mixed with the binder vinylidene fluoride (PVDF)...

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Abstract

The invention relates to a fast-charging lithium ion battery, a cathode material thereof and a preparation method of the cathode material. The preparation method includes: using a metal oxide MxNyOz (M, N=Zn, Cu, Fe, Mn, Ge, Co, Ni, Ti, V, Cr, Cd, Sn and the like, and 0< / =x< / =3, 0< / =y< / =3, and 1< / =x< / =5) nano rod as the template, allowing the nano rod to have in-situ polymerization with organic matter containing nitrogen, carbonizing to obtain a precursor, adding the precursor into a stripper plate reagent, and processing to obtain the nitrogen-doped mesoporous hollow rod-shaped carbon nanocapsule cathode material. Compared with a lithium ion battery using carbon materials, the fast-charging lithium ion battery has the advantages that under continuous high current density, super-fast charging and discharging can be achieved, and the fast-charging lithium ion battery is high in capacity and long in cycle life; when the charging and discharging are performed under the current density of 10A / g, the capacity is stably kept at 370mAh / g after the cycle of 10,000 circles; when the charging and discharging are performed under the super-large current density of 30A / g, the capacity is stably kept at 290mAh / g after the cycle of 10,000 circles, and good cycle stability and high capacity are achieved. The preparation method is simple, does not need complex equipment, capable of achieving large-batch preparation, and suitable for industrial production.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to an ultra-fast charging lithium-ion battery negative electrode material, a preparation method thereof and a lithium-ion battery. Background technique [0002] With the rapid development of portable communication devices, there is an urgent need for lithium-ion batteries with high power density, high capacity density, long cycle life, and ultra-fast charging and discharging. Rich in carbon materials and low in cost, it can avoid the huge volume expansion problem caused by using silicon, tin, metal oxides, etc. as anode materials when making lithium-ion battery anodes, and is very suitable as lithium-ion battery anode materials. However, the current commercial lithium-ion battery with graphite as the negative electrode material has a low theoretical specific capacity (372mAh / g), which restricts the improvement of the capacity of lithium-ion batteries and cannot meet th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M4/133H01M4/1393H01M10/0525
CPCH01M4/133H01M4/1393H01M4/583H01M10/0525H01M2220/30Y02E60/10
Inventor 王琳琳徐美兰徐菁利
Owner SHANGHAI UNIV OF ENG SCI
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