Lithium-rich cathode material doped with lithium manganate at Mn site, and preparation method of lithium-rich cathode material

A lithium-rich positive electrode material, lithium heteromanganate technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of poor cycle performance, poor rate performance, and voltage drop, so as to reduce reaction and improve thermal stability , Improve the effect of voltage drop

Inactive Publication Date: 2018-05-04
桑顿新能源科技(长沙)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the present invention provides a lithium-rich cathode material doped with lithium manganese oxide at the Mn site and a preparation method thereof, aiming to overcome the problems of low first effect, poor rate performance, and low voltage in current lithium-rich cathode materials. problems such as drop, poor cycle performance, and release of oxygen. By doping variable-valence metals on the Mn site, the oxygen evolution problem during charging can be effectively suppressed, and the rate performance and power of the prepared lithium-rich cathode material can be improved. The advantages of stable structure and stable material cycle

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] (1) Lithium acetate, manganese acetate, iron nitrate and citric acid are mixed according to the molar ratio of 2.0:0.95:0.05:3.6, dissolved in high-temperature pure water at 60°C, stirred for 10 hours, until the solution is uniform and clear, and then passed through Ultrasonic gas atomization (nitrogen pressure 1.2MPa) to form a prefabricated spherical powder, and then calcined at a high temperature, the sintering temperature is controlled at 450°C, and the sintering time is 5 hours to remove moisture and decompose organic matter to obtain spherical Li 2 MnO 3 powder;

[0041] (2) Use a high-energy mixer to prepare the spherical Li 2 MnO 3 Mix the powder (A powder) and uncoated NCM523 (B powder) uniformly for 1 hour, control D 50 (A powder) is D 50 14.5% of (B powder), the doping amount of A powder is 1.6%;

[0042] (3) Use Al 2 o 3 The powder is subjected to surface coating treatment on the above mixed powder, and the coating process: Al 2 o 3 The powder is fi...

Embodiment 2

[0046] (1) Lithium acetate, manganese chloride, titanium nitrate and aminoacetic acid are mixed according to the molar ratio of 2.1:0.9:0.1:3.72, dissolved in high-temperature pure water at 65°C, stirred for 15 hours until the solution is uniform and clear, and then Through ultrasonic gas atomization (nitrogen pressure 1.5MPa), a prefabricated spherical powder is formed, and then calcined at a high temperature, the sintering temperature is controlled at 500°C, and the sintering time is 5 hours to remove moisture and decompose organic matter to obtain spherical Li 2 MnO 3 powder;

[0047] (2) Use a high-energy mixer to uniformly mix the above-prepared powder (A powder) and uncoated NCM523 (B powder) for 2 hours, and control D 50 (A powder) is D 50 15% of (B powder), the doping amount of A powder is 1.5%;

[0048] (3) Using TiO 2 Powder is used for surface coating treatment of the above mixed powder, coating process: TiO 2 The powder is first homogenized in a stirred tank a...

Embodiment 3

[0052] (1) Mix lithium nitrate, manganese chloride, iron nitrate, titanium nitrate and ammonia water according to the molar ratio of 2.2:0.95:0.03:0.02:3.84, dissolve in high-temperature pure water at 55°C, stir for 20 hours, until the solution Uniform clarification, and then through ultrasonic gas atomization (nitrogen pressure 1.25MPa) to form prefabricated spherical powder, and then calcined at high temperature, control the sintering temperature of 600 ° C, sintering time of 6 hours, remove moisture and decompose organic matter to obtain spherical Li 2 MnO 3 powder;

[0053] (2) Use a high-energy mixer to uniformly mix the above-prepared powder (A powder) and uncoated NCM424 (B powder) for 3 hours, and control D 50 (A powder) is D 50 14.6% of (B powder), the doping amount of A powder is 3.0%;

[0054] (3) Use ZrO 2 Powder is used for surface coating treatment of the above mixed powder, coating process: ZrO 2 The powder is first homogenized in a stirred tank and dispers...

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Abstract

The invention provides a lithium-rich cathode material doped with lithium manganate at a Mn site, and a preparation method of the lithium-rich cathode material. The preparation method of the lithium-rich cathode material doped with the lithium manganate at the Mn site comprises the following steps: evenly mixing a lithium source, a manganese source, doped metal salt and a metal complexing agent, carrying out ultrasonic gas atomization on the obtained mixture, and calcining to obtain spherical lithium manganate powder; mixing the obtained spherical lithium manganate powder with a spherical cathode material, coating and calcining. The lithium-rich cathode material provided by the invention is prepared by doping the lithium manganate at the Mn site, thus effectively inhibiting oxygen evolution and solving the problem of voltage drop in a circulating process; the tap density of powder can be improved by mixing, so that the energy density of the material is further improved; due to the stepof coating, the loss of oxygen vacancies and the migration of transition metal ions are reduced; after the lithium-rich cathode material is adopted, the first time efficiency is increased, the safetyperformance of batteries is improved, and the energy density of the material is improved.

Description

technical field [0001] The invention relates to the technical field of positive electrode materials for lithium ion batteries, in particular to a lithium-rich positive electrode material with Mn site doped with lithium manganate and a preparation method thereof. Background technique [0002] Environmental pollution and energy crisis are two major issues facing society at present, and the widespread use of fuel vehicles has aggravated the above problems. Therefore, in order to solve environmental and energy problems, new energy vehicles represented by electric vehicles have attracted more and more attention. At present, most electric vehicles on the market use lithium-ion batteries as the power source. However, the current energy density of lithium-ion batteries cannot meet the national requirements for the energy density of single power batteries to reach 350Wh / kg. In addition to improving the energy density of the battery cell structure design and manufacturing process, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505
CPCH01M4/505Y02E60/10
Inventor 王星星邢伟伟李小兵温转萍王佳希
Owner 桑顿新能源科技(长沙)有限公司
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