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Li-O site lithium manganate doped lithium-enriched positive electrode material and preparation method thereof

A lithium-rich cathode material, lithium heteromanganate technology, applied in nanotechnology, battery electrodes, nanotechnology and other directions for materials and surface science, can solve problems such as voltage drop, poor cycle performance, poor rate performance, etc. Achieve the effect of improving voltage drop, reducing reaction, and improving thermal stability

Active Publication Date: 2018-05-29
余姚市海泰贸易有限公司
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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 Li-O site and a preparation method thereof, aiming at overcoming the low first effect, poor rate performance, and There are problems such as voltage drop, poor cycle performance, and oxygen release, which improves the rate performance and power of the prepared lithium-rich cathode material, and has the advantages of stable structure and material cycle stability during charging.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) α-MnO 2 , LiOH and Li 3 N is Mn in molar ratio: Li: Li = 1.0: 1.05: 0.34 The proportion of the ingredients is carried out, and the high-energy ball mill is used for dry ball milling and mixing (controlling speed 400r / min, mixing time 8 hours), so that the mixture is uniform without abnormal phenomenon, and then the mixture is put into an agate crucible and placed in an atmosphere protection furnace Carry out high-temperature solid-state sintering, sintering under nitrogen, control the sintering temperature at 750°C, and sintering time for 20 hours to generate nano-scale doped Li 2 MnO 3 powder;

[0040] (2) Using Al 2 o 3 Nano-scale doped Li coated in a wet-process monolayer 2 MnO 3 Powder coating process: Al 2 o 3 The powder is firstly homogenized in a stirred tank and dispersed until uniform, then the material to be coated is added doped with lithium manganate powder, fully stirred evenly, followed by drying (120°C, 4 hours), and then calcined (500°C, 20 ...

Embodiment 2

[0045] (1) α-MnO 2 , LiOH and LiF are batched with a molar ratio of Mn: Li: Li=1.0: 1.0: 1.1, using a high-energy ball mill to carry out dry ball milling (controlling speed 450r / min, mixing time 8.5 hours), making it mix Uniform and no abnormal phenomenon, then the mixture is put into an agate crucible, placed in an atmosphere protection furnace for high-temperature solid-phase sintering, sintered under nitrogen, the sintering temperature is controlled at 800 ° C, and the sintering time is 22 hours to generate nano-scale doped Li 2 MnO 3 powder;

[0046] (2) Using TiO 2 Nano-scale doped Li coated in a wet-process monolayer 2 MnO 3 Powder, coating process: TiO 2 The powder is first homogenized in a stirred tank and dispersed until uniform, then the material to be coated is added doped with lithium manganate powder, fully stirred evenly, followed by drying (120°C, 4 hours), and then calcined (550°C, 20 hours), the overall coating amount is less than 4.5%, and dried and sie...

Embodiment 3

[0051] (1) α-MnO 2 , LiOH and LiF, Li 3 N is Mn with molar ratio: Li: Li: the ratio of Li=1.0:1.0:0.23:0.29 carries out batching, adopts high-energy ball mill to carry out dry method ball mill mixing (controlling speed 500r / min, mixing time 9.5 hours), make it Mix evenly without abnormal phenomenon, then put the mixture into an agate crucible, place it in an atmosphere protection furnace for high-temperature solid-phase sintering, sinter under nitrogen, control the sintering temperature at 900°C, and sinter for 24 hours to generate nano-scale doped Li 2 MnO 3 powder;

[0052] (2) Using ZrO 2 Wet single-layer coating of the above-mentioned Li 2 MnO 3 Powder, coating process: ZrO 2 The powder is first homogenized in a stirred tank and dispersed until uniform, then the material to be coated is added doped with lithium manganate powder, fully stirred evenly, followed by drying (120°C, 6 hours), and then calcined (600°C, 18 hours), the overall coating amount is less than 4.8...

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Abstract

The invention provides a Li-O site lithium manganate doped lithium-enriched positive electrode material and a preparation method thereof. The Li-O site lithium manganate doped lithium-enriched positive electrode material is prepared through mixing a manganese source, a lithium source and an element lithium doped compound and then carrying out a process including solid-phase sintering, wet-processcladding, material mixing and calcination. The prepared positive electrode material realizes doping on a Li site and an O site of lithium manganate and the aims of effectively inhibiting oxygen evolution, improving the rate performance, keeping an oxygen vacancy in a charging process, improving the initial efficiency, improving the safety performance of a battery and improving the energy density of the material are realized.

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 doped with lithium manganese oxide at the Li-O site and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high average output voltage, high energy density, large output power, small self-discharge, no memory effect, excellent cycle performance, fast charge and discharge, high charging efficiency, wide operating temperature range, and environmental friendliness. In recent years, with the development of electric vehicles, its technology has developed rapidly. However, the current energy density of lithium-ion batteries cannot meet the requirements of electric vehicles for long battery life. In the final analysis, the energy density of lithium-ion batteries cannot meet the requirements. In addition to improving the energy density of the ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/485H01M4/62H01M10/0525B82Y30/00
CPCH01M4/366H01M4/485H01M4/505H01M4/525H01M4/628H01M10/0525B82Y30/00Y02E60/10
Inventor 王星星邢伟伟李小兵温转萍王佳希
Owner 余姚市海泰贸易有限公司
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