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Lithium cobalt oxide positive electrode material and preparation method and application thereof

A positive electrode material, lithium cobalt oxide technology, applied in the field of lithium cobalt oxide positive electrode material and its preparation, can solve problems such as poor structural stability, failure to meet application requirements, serious side reactions, etc., to improve gram capacity, structure and surface interface stability Enhanced performance and simple preparation process

Pending Publication Date: 2022-06-28
BEIJING EASPRING MATERIAL TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the poor structural stability of oxygen-containing compound doping and / or coating lithium cobalt oxide materials in the prior art and serious side reactions with the electrolyte in the high delithiation state, which cannot meet the requirements of high-voltage conditions. To solve the problem of application requirements, a lithium cobaltate cathode material and its preparation method and application are provided. The lithium cobaltate cathode material has a specific structure, thereby improving the structural stability of the cathode material and significantly improving the performance of the lithium cobaltate cathode in a state of high delithiation. Oxygen evolution problem, and reduce the degree of side reactions between the positive electrode material and the electrolyte under high voltage conditions, and improve the electrochemical performance of lithium-ion batteries

Method used

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  • Lithium cobalt oxide positive electrode material and preparation method and application thereof
  • Lithium cobalt oxide positive electrode material and preparation method and application thereof
  • Lithium cobalt oxide positive electrode material and preparation method and application thereof

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preparation example Construction

[0052] The preparation method of the above product includes roasting and calcining process, wherein the heating process of the roasting process below 600 ° C adopts an oxygen-depleted or oxygen-free atmosphere with an oxygen content <20vol%, and at 600 ° C and above, the oxygen content is ≥ 20vol%. air or / and oxygen atmosphere.

[0053] A second aspect of the present invention provides a method for preparing a lithium cobalt oxide positive electrode material, characterized in that the method comprises the following steps:

[0054] (1) prepare mixed salt solution with cobalt salt and aluminum salt according to the molar ratio of n(Co):n(Al)=(1-x-a-b):x; combine precipitating agent, complexing agent and optionally the first additive, respectively formulated as a precipitant solution, a complexing agent solution and optionally a first additive mixture;

[0055] (2) the mixed salt solution, the precipitant solution, the complexing agent solution and the optional first additive mi...

Embodiment 1

[0201] S1, prepare 1mol / L cobalt and aluminum sulfate mixed solution (molar ratio n(Co):n(Al)=0.921:0.025), 2.5mol / L sodium carbonate solution, 3mol / L ammonia water, 1mol / L NiSO 4 and MnSO 4 Mixed solution (c(Ni):c(Mn)=1:1), the above-mentioned several solutions are passed into the reactor in a cocurrent manner, wherein NiSO 4 and MnSO 4 The feeding amount of the mixed solution was n(Co):n(Ni):n(Mn)=0.921:0.002:0.002, the reaction temperature was kept at 50°C, and the reaction pH was 7.5. After the reaction was completed, it was aged for 6 hours, then filtered, washed, dried at 110 °C, sieved, and then heat-treated at 700 °C for 6 hours in an air atmosphere to obtain a lithium cobalt oxide cathode material precursor.

[0202] S2, the obtained lithium cobalt oxide cathode material precursor, lithium carbonate, yttrium diboride (YB 2 ), according to the ratio of n(Co):n(Li):n(Y)=0.921:1.05:0.002, fully mixed in a high mixer, calcined at 1050℃ for 12h, wherein the roasting pr...

Embodiment 2

[0207]S1, prepare 1mol / L cobalt and aluminum sulfate mixed solution (molar ratio n(Co):n(Al)=0.8:0.05), 2.5mol / L sodium carbonate solution, 3mol / L ammonia water, 1mol / L The magnesium sulfate solution, the above-mentioned several solutions are passed into the reactor in a parallel mode, and wherein the magnesium sulfate solution intake amount is n(Co):n(Mg)=0.8:0.005, and keeping the temperature of reaction is 40 ℃, The pH of the reaction was 8. After the reaction was completed, it was aged for 10 hours, then filtered, washed, dried at 110°C, sieved, and then heat-treated at 500°C for 8 hours in an air atmosphere to obtain a lithium cobalt oxide cathode material precursor.

[0208] S2, the obtained lithium cobalt oxide cathode material precursor, lithium carbonate, titanium diboride (TiB 2 ), according to the ratio of n(Co):n(Li):n(Ti)=0.8:1.12:0.005, fully mixed in a high-speed mixer, calcined at a temperature of 900℃ for 15h, wherein the calcination process is below 600℃ Th...

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Abstract

The invention relates to the technical field of lithium ion batteries, and discloses a lithium cobalt oxide positive electrode material and a preparation method and application thereof. The ratio I (006) / I (012) of the peak intensity I (006) of the (006) crystal face to the peak intensity I (012) of the (012) crystal face obtained by XRD (X-Ray Diffraction) of the positive electrode material is greater than or equal to 1; and the ratio A (006) / A (012) of the peak area A (006) of the (006) crystal face obtained by XRD to the peak area A (012) of the (012) crystal face of the positive electrode material is greater than or equal to 0.9. The lithium cobalt oxide positive electrode material has a specific structure, so that the structural stability of the positive electrode material is improved, the oxygen evolution problem in a high lithium removal state is remarkably improved, the degree of side reaction between the positive electrode material and an electrolyte under a high voltage condition is reduced, and the electrochemical performance of a lithium ion battery is improved.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a lithium cobalt oxide positive electrode material and a preparation method and application thereof. Background technique [0002] Due to the increasing demand for energy density of lithium ion batteries in the 3C market in recent years, and the key role of lithium cobalt oxide cathode materials on the volumetric energy density and cycle life of lithium ion batteries in the 3C field, high energy density lithium cobalt oxide materials continue to be a research hotspot. researchers and the market. [0003] Improving the volumetric energy density of lithium-ion battery cathodes in the 3C field is mainly achieved by increasing the compaction density of the pole pieces or increasing the gram capacity of active materials. At present, the research and application of improving the compaction density of the pole piece has been relatively mature, and it is temporarily difficult to con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/525H01M4/36H01M10/0525C01G51/00
CPCH01M4/628H01M4/525H01M4/366H01M10/0525C01G51/42H01M2004/028C01P2002/72C01P2006/40
Inventor 王余岳鹏刘亚飞陈彦彬
Owner BEIJING EASPRING MATERIAL TECH CO LTD
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