High-capacity lithium-enriched positive electrode material and preparation method thereof

A lithium-rich positive electrode material and high-capacity technology, applied in the field of electrochemistry, can solve the problems of material structure collapse, lithium ion diffusion rate reduction, and material cycle stability deterioration, so as to reduce capacity loss, improve cycle stability and high The effect of low rate performance and electrochemical impedance

Active Publication Date: 2014-11-05
ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Lithium-rich material Li 1+x m 1-x o 2 Although the system material has a high specific capacity, it is easy to cause the electrolyte and Li 2 MnO 3 Decomposition, the structure of the material collapses, the diffusion rate of lithium ions decreases, and the cycle stability of the material becomes worse

Method used

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  • High-capacity lithium-enriched positive electrode material and preparation method thereof
  • High-capacity lithium-enriched positive electrode material and preparation method thereof
  • High-capacity lithium-enriched positive electrode material and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0047] The molar ratio is (0.54:0.13:0.13) to prepare manganese acetate, cobalt acetate, nickel acetate mixed solution, the total concentration of transition metal ions is 0.08mol / L, the concentration of prepared urea solution is 0.16mol / L, and the volume ratio is 1: 1 After mixing the two solutions for half an hour, transfer to a 100ml reaction kettle (50% fill). The reaction was carried out at 90°C for 3h, at 110°C for 3.5h, and finally at 170°C for 15h. Naturally cool to room temperature, suction filter, wash until the pH is about neutral, and dry at 50°C for 24 hours to obtain a carbonate precursor. It looks like figure 1 , the particles are spherical and uneven in size. From the enlarged picture of a single particle, it can be seen that spherical particles are aggregates formed by many nanoparticles, which are mesogens assembled and synthesized in situ by different components, with larger specific surface area and high porosity. Its XRD is figure 2 , with MnCO 3 The...

Embodiment 2

[0050] According to the molar ratio (0.52:0.13:0.13:0.02), the mixed solution of manganese sulfate, cobalt sulfate, nickel sulfate and yttrium sulfate is prepared, the total concentration of transition metal ions is 0.08mol / L, and the concentration of the prepared urea solution is 0.32mol / L. The ratio was 1:1. After mixing the two solutions for half an hour, they were transferred to a 100ml reactor (50% fill). The reaction was carried out at 90 °C for 3 h, at 110 °C for 3.5 h, and finally at 190 °C for 15 h. Naturally cooled to room temperature, suction filtered, washed until the pH was about neutral, and dried at 50 °C for 24 h to obtain a carbonate precursor. It looks like Figure 6 As shown, it is a spherical particle, a mesogenic material composed of many small particles.

[0051] According to the stoichiometric ratio = 1.2:0.8, lithium carbonate and the precursor were weighed respectively, and absolute ethanol was used as a dispersant, and the water bath was placed at 6...

Embodiment 3

[0053] Prepare a mixed solution of manganese nitrate, cobalt nitrate, nickel nitrate and yttrium nitrate in molar ratio (0.52:0.13:0.13:0.02), the total concentration of transition metal ions is 0.16mol / L, and the concentration of prepared urea solution is 0.40mol / L. The ratio was 1:1. After mixing the two solutions for half an hour, they were transferred to a 100ml reactor (50% fill). The reaction was carried out at 90 °C for 3 h, at 110 °C for 3.5 h, and finally at 210 °C for 15 h. Naturally cooled to room temperature, suction filtered, washed until the pH was about neutral, and dried at 50 °C for 24 h to obtain a carbonate precursor. It looks like Figure 8 As shown, the spherical particles are a mesogenic material composed of many small particles.

[0054] According to the stoichiometric ratio of 1.15:0.8:0.05, lithium hydroxide, precursor and sodium hydroxide were weighed, and absolute ethanol was used as a dispersant, and the water bath was placed at 60 °C until the ab...

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Abstract

The invention belongs to the field of electrochemistry and particularly relates to a high-capacity lithium-enriched positive electrode material and a reparation method thereof. The molecular formula of the high-capacity lithium-enriched positive electrode material is Li[Li<x-beta>Na<beta>Mn<1-y-z-alpha>Co<y>Ni<z>Y<alpha>]O2, wherein x is more than or equal to 0 and less than or equal to 0.6, y is more than 0 and less than or equal to 0.4, z is more than 0 and less than or equal to 0.4, alpha is more than or equal to 0 and less than or equal to 0.1 and beta is more than or equal to 0 and less than or equal to 0.2; the result of (1-y-z-alpha) is more than 0 and the result of (x-beta) is more than 0. The lithium-enriched positive electrode material containing Na and Y has the characteristics of low first-time irreversible capacity, large electrochemical capacity, high cycling stability, excellent rate performance and the like. The preparation method has the advantages that a preparation process is simple, raw materials are cheap and easily available, the cost is low, the high-temperature calcination time is very short, the repeatability is good and the industrialization is easy to realize.

Description

[0001] technical field [0002] The invention belongs to the field of electrochemistry, and in particular relates to a high-capacity lithium-rich cathode material for lithium-ion batteries and a preparation method thereof. Background technique [0003] At present, the next-generation lithium-ion power battery with the major application background of electric vehicles, electric tools and grid energy storage, under the basic conditions of safety, environmental protection, cost and life, the key performance indicators are high energy density and fast discharge. ability. The currently developed cathode materials for lithium-ion batteries mainly include layered lithium cobalt oxide (LiCoO 2 ), lithium nickelate (LiNiO 2 ), lithium manganate (LiMnO 2 ), spinel lithium manganese oxide (LiMn 2 o 4 ), lithium iron phosphate (LiFePO 4 ), and lithium nickel cobalt oxide (LiNi x co y o 2 ), lithium nickel cobalt manganese oxide (LiNi x co y mn z o 2 ) and other lithium-cont...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525
CPCH01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 张林森金恺王力臻张勇
Owner ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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