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A kind of lithium ion battery cathode material and preparation method and application thereof

A lithium-ion battery and positive electrode material technology, applied in the field of lithium-ion battery positive electrode materials and its preparation, can solve the problems of the first round of charge and discharge capacity decline, the increase of positive electrode active materials, and the high overpotential of the positive electrode sheet, so as to reduce direct contact, Inhibits dissolution and reduces the effect of residual alkali

Active Publication Date: 2022-07-12
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Abstract
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  • Claims
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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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  • A kind of lithium ion battery cathode material and preparation method and application thereof
  • A kind of lithium ion battery cathode material and preparation method and application thereof
  • A kind of lithium ion battery cathode material and preparation method and application thereof

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preparation example Construction

[0031] A first aspect of the present invention provides a method for preparing a positive electrode material for a lithium ion battery, comprising the following steps:

[0032] According to the chemical formula Al 2 Ti 1+a O 5 Dissolve the water-soluble titanium source and aluminum source in water, and mix them evenly to obtain a mixed solution;

[0033] Mixing the polymer hydrogel and the ternary positive electrode material uniformly to obtain a first mixture;

[0034] Under the condition of ultrasonic vibration, drop the mixed solution into the first mixture to obtain the second mixture;

[0035] After the second mixture is activated by plasma, it is sintered, crushed and sieved to obtain a positive electrode material for a lithium ion battery.

[0036] In the preparation method, the ternary positive electrode material refers to LiNi, a conventional ternary positive electrode material in this field. x Co y M 1-x- y O 2 , where M is manganese (Mn) or aluminum (Al), 0...

Embodiment 1

[0049] In this example, 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 cathode 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 them in deionized water, and stir magnetically evenly to obtain a mixed solution with a metal ion concentration of 10 g / L;

[0051] Combining polyacrylamide hydrogel and single crystal cathode material LiNi 0.7 Co 0.1 Mn 0.2 O 2 According to the mass ratio of 1:60, dry mixing is uniform to obtain the first mixture;

[0052] Under the condition of ultrasonic vibration, the mixed solution was dropped dropwise into the first mixture to form a second mixture; the reaction was continued under ultrasonic conditions for 1 h, wherein the temperature was 50 °C, and the ultrasonic dispersion frequency was 10 kHz; then the second mixture was mixed Lay it on the tray, unde...

Embodiment 2

[0056] In this example, the secondary ball 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 cathode 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 them in deionized water, and stir magnetically evenly to obtain a mixed solution with a metal ion concentration of 10 g / L;

[0058] Combining polyacrylic acid hydrogel and secondary sphere cathode material LiNi 0.7 Co 0.1 Mn 0.2 O 2 According to the mass ratio of 2:90, dry mixing is uniform to obtain the first mixture;

[0059] Under the condition of ultrasonic vibration, the mixed solution was dropped dropwise into the first mixture to form a second mixture; the reaction was continued for 1 h under ultrasonic conditions, wherein the temperature was 50 °C, and the ultrasonic dispersion frequency was 15 kHz; then the second mixture was mixed Spread it on the...

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Abstract

The invention discloses a positive electrode material for a lithium ion battery and a preparation method and application thereof, comprising the following steps: according to the general chemical formula Al 2 Ti 1+a O 5 The water-soluble titanium source and the aluminum source are dissolved in water, and mixed uniformly to obtain a mixed solution; the hydrogel and the ternary positive electrode material are mixed uniformly to obtain a first mixture; the mixed solution is dropped into the first mixture to obtain a second mixture. mixture; after plasma activation of the second mixture, sintering, crushing and sieving to obtain a positive electrode material for a lithium ion battery. The preparation method has the advantages of simple operation and low cost, and the obtained positive electrode material of the lithium ion battery has low residual alkali content, stable interface structure and excellent electrochemical performance.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a positive electrode material of a lithium ion battery 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 performance of the cathode 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 four categories: lithium cobalt oxide (LCO), lithium manganate (LMO), lithium iron phosphate (LFP) and ternary materials (NCM / NCA). Among them, lithium iron phosphate and lithium manganate materials do not have much room for technological br...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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