Lithium niobate coated and niobium doped coupled modified high-nickel ternary positive electrode material as well as preparation method and application of lithium niobate coated and niobium doped coupled modified high-nickel ternary positive electrode material

A high-nickel ternary material and cathode material technology, applied in the direction of positive electrodes, active material electrodes, electrical components, etc., can solve the problems of poor rate performance, poor cycle stability, etc., and achieve good stability, inhibit phase transition, and high purity Effect

Pending Publication Date: 2022-02-01
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the defects of high-nickel ternary materials in the prior art, one of the purposes of the present invention is to provide a lithium niobate coating with Nb with better interface stability and structural stability. 5+ A method for preparing a doped-coupled high-nickel ternary cathode material. The cathode material produced by this method can not only inhibit the side reaction between the electrolyte and the interface during the cycle, but also inhibit the phase transition during the cycle, thereby enhancing the cycle. Stability and structural stability, which can effectively overcome the problems of poor rate performance, poor cycle stability, and cracks in existing cathode materials

Method used

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  • Lithium niobate coated and niobium doped coupled modified high-nickel ternary positive electrode material as well as preparation method and application of lithium niobate coated and niobium doped coupled modified high-nickel ternary positive electrode material
  • Lithium niobate coated and niobium doped coupled modified high-nickel ternary positive electrode material as well as preparation method and application of lithium niobate coated and niobium doped coupled modified high-nickel ternary positive electrode material
  • Lithium niobate coated and niobium doped coupled modified high-nickel ternary positive electrode material as well as preparation method and application of lithium niobate coated and niobium doped coupled modified high-nickel ternary positive electrode material

Examples

Experimental program
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Effect test

Embodiment 1

[0040] Take commercially available high-nickel ternary cathode material, the chemical formula is LiNi 0.88 Co 0.10 Mn 0.02 O 2 , named NCM88. It was detected by scanning electron microscope, and the detection results were as follows figure 1 As shown, the positive electrode material is a secondary particle composed of agglomeration of primary nanoparticles, with a particle size of about 5 μm, and the primary nanoparticles are already about 500 nm.

[0041] The high-nickel ternary positive electrode material used in the following examples is the high-nickel ternary positive electrode material NCM88 of this embodiment.

Embodiment 2

[0043] A preparation method of a high-nickel ternary positive electrode material with lithium niobate coating and niobium doping coupling modification, comprising the following steps:

[0044] S1, take 20.5126mg of niobium oxalate ammonia C 4 H4 NNbO 9 ·nH 2 , 2.8665mg of lithium hydroxide LiOH·H 2 O; Add ammonium niobium oxalate and lithium hydroxide to 30ml of anhydrous ethanol solution respectively, stir in oil bath at 35°C and rotate at 400rpm until completely dissolved to form solution A and solution B respectively; mix solution A and solution B, oil bath Heated to 45°C, stirred for 1 h, and the stirring speed was 1000 mg of high nickel ternary material (LiNi 0.88 Co 0.10 Mn 0.02 O 2 ), heated and stirred in an oil bath at a temperature of 50 ° C, the stirring speed was 400 rpm, and stirred for 2 hours; then the temperature was raised to 75 ° C and continued to be heated and stirred in an oil bath, and the stirring speed was 400 rpm, until the solution remained a li...

Embodiment 3

[0047] A preparation method of a high-nickel ternary positive electrode material with lithium niobate coating and niobium doping coupling modification, comprising the following steps:

[0048] S1, take 61.5375mg of niobium oxalate ammonia C 4 H 4 NNbO 9 ·nH 2 , 8.5995mg of lithium hydroxide LiOH·H 2 O, add 30ml of absolute ethanol respectively, heat the oil bath to 35°C, and stir until completely dissolved under the condition that the rotating speed is 400rpm to obtain solution A and solution B; mix the two solutions, heat the oil bath to 45°C, stir For 1 hour, the stirring speed was 400 rpm; then 1000 mg of high-nickel ternary material was added, and the oil bath was heated to 50 °C for 2 hours, and the stirring speed was 400 rpm; then the oil bath was heated to 75 °C, and the stirring speed was 400 rpm. , until the solution remains a little, stop stirring and heating, and use the residual heat to evaporate to dryness to obtain the precursor powder;

[0049] S2. Take the...

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Abstract

The invention provides a lithium oxide coated and niobium doped coupled modified high-nickel ternary positive electrode material as well as a preparation method and application thereof. The preparation method of the positive electrode material comprises the following steps of: weighing a niobium source and a lithium source according to a theoretical calculation proportion of a molecular formula LiNbO3; respectively dissolving the niobium source and the lithium source in absolute ethyl alcohol to prepare solutions, mixing two solutions, heating the mixed solution, and then adding a high-nickel ternary material; continuously heating the mixed solution until the absolute ethyl alcohol in the mixed solution is evaporated to dryness to obtain a precursor; and grinding the precursor, and calcining the precursor step by step to obtain the lithium niobate coated and niobium doped coupled modified high-nickel ternary positive electrode material. The positive electrode material disclosed by the invention not only can inhibit side reaction between an electrolyte and an interface in a circulating process, but also can inhibit phase change in the circulating process, so that the circulating stability and the structural stability can be enhanced, and the problems of poor rate capability, poor circulating stability, crack generation and the like in the existing positive electrode material can be effectively solved.

Description

technical field [0001] The invention relates to the field of high-nickel ternary positive electrode materials, and more particularly, to a high-nickel ternary positive electrode material which is coated with lithium niobate and modified by niobium doping, and a preparation method and application thereof. Background technique [0002] With the development of society, clean and efficient energy storage and conversion has become a research hotspot in the energy field. As a new type of secondary power source, lithium-ion battery has the advantages of high specific energy, no memory effect, long cycle life, and low environmental pollution, which has injected fresh blood into the vigorous development of the energy network. Lithium-ion electric vehicles are an important part of the new energy vehicle family. As the "heart" of electric vehicles, high-energy-density lithium-ion power batteries can effectively overcome the problem of "range anxiety" in the field of electric vehicles. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/505H01M4/525H01M4/131H01M10/0525
CPCH01M4/628H01M4/505H01M4/525H01M4/131H01M10/0525H01M2004/028H01M2004/021Y02E60/10
Inventor 纪效波尹首懿侯红帅邹国强邓文韬
Owner CENT SOUTH UNIV
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