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Perovskite type conductor material coated ternary positive electrode material, preparation method thereof and lithium ion battery

A technology of cathode materials and conductor materials, applied in the field of cathode materials for lithium-ion batteries, can solve the problems of electrode material activity changes, microstructure phase changes, and cycle performance deterioration, and achieve the goals of reducing dissolution, inhibiting dissolution, and reducing transfer resistance Effect

Pending Publication Date: 2020-11-13
XTC NEW ENERGY MATERIALS(XIAMEN) LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this battery material also has some problems and disadvantages. For example, during the migration of lithium ions, the microstructure will undergo a phase change, the structure of the electrode is closely related to its volume change, and the activity of the electrode material will change during the cycle. Cycle performance deteriorates

Method used

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  • Perovskite type conductor material coated ternary positive electrode material, preparation method thereof and lithium ion battery
  • Perovskite type conductor material coated ternary positive electrode material, preparation method thereof and lithium ion battery
  • Perovskite type conductor material coated ternary positive electrode material, preparation method thereof and lithium ion battery

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preparation example Construction

[0034] see figure 1 , the invention provides a method for preparing a ternary positive electrode material coated with a perovskite-type conductor material, which comprises the following steps:

[0035] In step S1, nickel sulfate, cobalt sulfate, and manganese sulfate are respectively dissolved in water, and after mixing, a co-precipitation reaction is carried out, and a ternary hydroxide precursor is obtained by drying.

[0036] In this embodiment, the molecular formula of the precursor is NixCoyMn(1-x-y)(OH)2, wherein, 0.5

[0037] In step S2, the ternary hydroxide precursor is mixed with lithium salt, then sintered at high temperature and crushed to obtain a ternary positive electrode material.

[0038] In this embodiment, the lithium salt includes at least one of lithium carbonate and lithium hydroxide, and the ratio of the number of moles of lithium elements in the lithium salt to the number of moles of metal elements in the ternary hydroxide prec...

Embodiment 1

[0057] Dissolve nickel sulfate, cobalt sulfate, and manganese sulfate in water respectively, then mix nickel sulfate solution, cobalt sulfate solution and manganese sulfate solution according to the molar ratio of 7:1:2, carry out co-precipitation reaction after mixing, and then dry A ternary hydroxide precursor is obtained.

[0058] According to the ratio of the number of moles of lithium element in the lithium salt to the number of moles of the metal element in the ternary hydroxide precursor is 1.10, lithium carbonate and the ternary hydroxide precursor are mixed, and after mixing uniformly, the mixture is placed in an air atmosphere 1. Sintering at a temperature of 910° C. for 15 hours, and crushing to obtain a ternary positive electrode material.

[0059] The ternary cathode material and La 0.7 Sr 0.3 MnO 3 The materials are weighed according to the weight ratio of 1:0.02, respectively dissolved in absolute ethanol, and dispersed by ultrasonic vibration after dissoluti...

Embodiment 2

[0062] Dissolve nickel sulfate, cobalt sulfate, and manganese sulfate in water respectively, then mix nickel sulfate solution, cobalt sulfate solution and manganese sulfate solution according to the molar ratio of 7:1:2, carry out co-precipitation reaction after mixing, and then dry A ternary hydroxide precursor is obtained.

[0063] According to the ratio of the number of moles of lithium element in the lithium salt to the number of moles of the metal element in the ternary hydroxide precursor is 1.08, lithium carbonate and the ternary hydroxide precursor are mixed, and after mixing evenly, place in an air atmosphere 1. Sintering at a temperature of 900° C. for 15 hours, and crushing to obtain a ternary positive electrode material.

[0064] The ternary cathode material and La 0.6 Sr 0.4 MnO 3 The materials were weighed according to the weight ratio of 1:0.04, dissolved in absolute ethanol respectively, and dispersed by ultrasonic oscillation after dissolution. The time of ...

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Abstract

The invention relates to a perovskite type conductor material coated ternary positive electrode material, a preparation method thereof and a lithium ion battery. The method comprises the steps of respectively dissolving the ternary positive electrode material and the perovskite type conductor material, and carrying out ball milling to obtain a positive electrode material solution and a coating material solution; mixing the positive electrode material solution and the coating material solution, and stirring and evaporating to form paste; and drying the paste, and then carrying out heat treatment, grinding and sieving to obtain the perovskite type conductor material coated ternary positive electrode material. The preparation method of the perovskite type conductor material coated ternary positive electrode material provided by the invention is simple and feasible in process; the method is high in practicability and universality and suitable for large-scale production, the transmission speed of lithium ions can be effectively increased through the prepared and synthesized material coating layer, meanwhile, the transfer resistance of the lithium ions on an electrode / electrolyte interface is effectively reduced, and dissolution of metal ions is inhibited.

Description

technical field [0001] The present invention relates to the technical field of anode materials for lithium-ion batteries, in particular to a ternary anode material coated with a perovskite-type conductor material and a preparation method thereof, and a ternary cathode material coated with the perovskite-type conductor material. Cathode materials for lithium-ion batteries. Background technique [0002] In recent years, people have become more and more concerned about clean and reliable energy sources, because these are closely related to our health, daily life and the global economy and environment. Without energy storage and renewable energy, people will not be able to move forward. Lithium-ion battery is considered as the most potential electric energy storage system nowadays, because it can be applied in various fields, especially hybrid electric vehicle and consumer electronics industry, etc., so the development of lithium-ion battery technology progress is very importan...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/624H01M4/628H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 叶耀滨魏国祯林琳王静任
Owner XTC NEW ENERGY MATERIALS(XIAMEN) LTD