Lithium ion battery positive electrode material as well as preparation method and application thereof

A technology for lithium-ion batteries and positive electrode materials, applied in the field of lithium-ion battery positive electrode materials and its preparation, can solve the problems of first-round charge and discharge capacity decline, positive active material intensification, positive electrode plate overpotential increase, etc., to reduce direct contact, Inhibiting dissolution and reducing the effect of residual alkali

Active Publication Date: 2021-12-10
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although coating layers such as metal oxides and hydroxides can effectively improve the cycle performance of the material, the presence of the coating layer has a certain barrier effect on the deintercalation of lithium ions, resulting in a decrease in the first-round charge-discharge capacity of the material. decline
With the improvement of the voltage system of the lithium-ion battery, fast charging under high temperature conditions will intensify the damage to the positive active material in the positive electrode of the lithium-ion battery, especially when the doping and / or coating amount of the positive active material increases, the positive electrode The DC internal resistance (DCR) of the sheet increases to a certain extent, and the rate performance deteriorates. When the charging speed is accelerated, it is easy to cause the overpotential of the positive electrode sheet to increase, and the polarization of the positive electrode increases, which will have an adverse effect on the cycle.

Method used

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  • Lithium ion battery positive electrode material as well as preparation method and application thereof
  • Lithium ion battery positive electrode material as well as preparation method and application thereof
  • Lithium ion battery positive electrode material as well as preparation method and application thereof

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preparation example Construction

[0031] The first aspect of the present invention provides a kind of preparation method of lithium-ion battery cathode material, comprises the following steps:

[0032] According to the general chemical formula Al 2 Ti 1+a o 5 Dissolving the water-soluble titanium source and aluminum source in water and mixing them uniformly to obtain a mixed solution;

[0033] Mix the polymer hydrogel and the ternary cathode material evenly to obtain the first mixture;

[0034] Dropping the mixed solution into the first mixture under ultrasonic vibration conditions to obtain the second mixture;

[0035] After plasma activation of the second mixture, sintering, crushing and sieving, the lithium ion battery cathode material is obtained.

[0036] In this preparation method, the ternary positive electrode material refers to the conventional ternary positive electrode material LiNi in this field. x co y m 1-x- y o 2 , wherein, M is manganese (Mn) or aluminum (Al), 02 Ti 1+a o 5 (where, a...

Embodiment 1

[0049] In this embodiment, single crystal LiNi 0.7 co 0.1 mn 0.2 o 2 @Al 2 Ti 1.05 o 5 The specific steps for the preparation of lithium-ion positive electrode materials are as follows:

[0050] According to the chemical formula Al 2 Ti 1.05 o 5 Weigh water-soluble titanium trichloride and aluminum trichloride, dissolve in deionized water, stir evenly with a magnetic force, and obtain a mixed solution with a metal ion concentration of 10 g / L;

[0051] Polyacrylamide hydrogel and single crystal cathode material LiNi 0.7 co 0.1 mn 0.2 o 2 Mix evenly according to the mass ratio of 1:60 to obtain the first mixture;

[0052] Under the condition of ultrasonic vibration, drop the mixed solution into the first mixture to form the second mixture; continue to react under the ultrasonic condition for 1h, wherein, the temperature is 50°C, and the ultrasonic dispersion frequency is 10kHz; then the second mixture Lay it flat on the tray, under the protection of argon, use 100L...

Embodiment 2

[0056] Secondary spherical LiNi in this embodiment 0.7 co 0.1 mn 0.2 o 2 @Al 2 Ti 1.05 o 5 The specific steps for the preparation of lithium-ion positive electrode materials are as follows:

[0057] According to the chemical formula Al 2 Ti 1.05 o 5 Weigh water-soluble titanium trichloride and aluminum trichloride, dissolve in deionized water, stir evenly with a magnetic force, and obtain a mixed solution with a metal ion concentration of 10 g / L;

[0058] Polyacrylic acid hydrogel and secondary spherical cathode material LiNi 0.7 co 0.1 mn 0.2 o 2 Mix evenly according to the mass ratio of 2:90 to obtain the first mixture;

[0059] Under the condition of ultrasonic vibration, drop the mixed solution into the first mixture to form the second mixture; continue to react under the ultrasonic condition for 1h, wherein, the temperature is 50°C, and the ultrasonic dispersion frequency is 15kHz; then the second mixture Lay it flat on the tray, under the protection of argo...

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Abstract

The invention discloses a lithium ion battery positive electrode material as well as a preparation method and application thereof. The preparation method comprises the steps of dissolving a water-soluble titanium source and a water-soluble aluminum source in water according to a chemical general formula Al2Ti<1+a>O5, and uniformly mixing to obtain a mixed solution; uniformly mixing hydrogel and a ternary positive electrode material to obtain a first mixture; dropwise adding the mixed solution into the first mixture to obtain a second mixture; and performing plasma activation on the second mixture, sintering, crushing and sieving to obtain the lithium ion battery positive electrode material. The preparation method is simple to operate and low in cost, and the obtained lithium ion battery positive electrode material is low in residual alkali content, stable in interface structure and excellent in electrochemical performance.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a lithium-ion battery cathode material and a preparation method and application thereof. Background technique [0002] With the development of new energy vehicles, higher requirements are put forward for power lithium batteries. Among them, energy density, cost, safety, thermal stability, and cycle life are the five key performance indicators of power lithium batteries. As the core of the power lithium battery, the positive electrode material directly affects the performance of the power lithium battery. At present, the cathode materials that have been widely used in the market mainly include lithium cobalt oxide (LCO), lithium manganese oxide (LMO), lithium iron phosphate (LFP) and ternary materials (NCM / NCA). Among them, lithium iron phosphate and lithium manganese oxide materials do not have much room for technological breakthroughs in basic research...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/505H01M4/525H01M10/0525
CPCH01M4/625H01M4/628H01M4/505H01M4/525H01M10/0525H01M2004/028H01M2004/021Y02E60/10
Inventor 王庆莉王辉严雪枫高玉仙徐丹丹丁楚雄陈方
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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