A multi-element modified lithium-rich manganese-based positive electrode material and preparation method thereof

A cathode material, lithium-rich manganese-based technology, which is applied in the field of multi-element modified lithium-rich manganese-based cathode materials and their preparation, can solve the problem that the stability of the morphology and structure of the material cannot be guaranteed, the specific energy of the battery cannot be provided, and halogen elements cannot be provided. Low reactivity and other problems, to achieve the effect of novel preparation method, friendly surrounding environment, and stable material performance

Active Publication Date: 2021-09-28
SICHUAN PANOVASIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its prominent problems of short cruising range and slow charging have not been effectively resolved.
In the first aspect, although the introduction of halogen elements can improve the reaction stability of lattice oxygen to a certain extent, the halogen elements themselves have low reactivity and cannot provide the specific energy of the battery, so it will lead to a decrease in battery capacity; the second aspect , the pure high-energy ball milling reaction cannot guarantee the morphology of the material and its structural stability in the electrochemical reaction

Method used

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  • A multi-element modified lithium-rich manganese-based positive electrode material and preparation method thereof
  • A multi-element modified lithium-rich manganese-based positive electrode material and preparation method thereof
  • A multi-element modified lithium-rich manganese-based positive electrode material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0034] The preparation method of the lithium-rich manganese-based positive electrode material modified by replacing part of the lattice oxygen with sulfur element in this experiment is carried out according to the following steps:

[0035] Step 1: Put Li 2 CO 3 (5% excess), TiS 2 , MnO, MnO 2 Weigh according to the proportion required by the stoichiometric formula of the material, the total mass is about 2g, roughly grind and mix.

[0036] Step 2: In an atmosphere of high-purity argon, put the mixture into the 2 In the ball milling tank of the grinding balls, pour absolute ethanol as a coolant and seal it tightly. Afterwards, the sealed jar was put into a planetary ball mill and ground for 48 hours at a speed of 500rps / min.

[0037]Step 3: Then take out the suspension sample, and carry out spray drying to remove the liquid while completing the spherical granulation of the precursor secondary particles.

[0038] Step 4: Put the sample in a tube furnace, bake it at 850°C f...

Embodiment 2

[0041] Step 1: LiOH·H 2 O (excess 5%), TiS 2 , MnCO 3 , CeO 2 Weigh according to the ratio required by the stoichiometric formula of the material, wherein the stoichiometric number of sulfur is 0.1, the total mass is approximately 2g, and roughly ground and mixed.

[0042] Step 2: In an atmosphere of high-purity argon, put the mixture into the 2 In the ball mill jar of the grinding balls, pour alcohol as a coolant and seal it tightly. Afterwards, the sealed jar was put into a planetary ball mill, and ball milled for 72 hours at a speed of 400rps / min.

[0043] Step 3: Then take out the suspension sample, and carry out spray drying to remove the liquid while completing the spherical granulation of the precursor secondary particles.

[0044] Step 4: Put the sample in a tube furnace, bake it at 900°C for 5 hours in an inert gas atmosphere, and cool it down to room temperature naturally to obtain the target product. The modified lithium-rich manganese-based cathode material ha...

Embodiment 3

[0047] The preparation method of the lithium-rich manganese-based positive electrode material modified by partially replacing the lattice oxygen with sulfur in this experiment is carried out according to the following steps:

[0048] Step 1: Put Li 2 CO 3 (5% excess), TiS 2 , MnO, NiF, and LiF are weighed according to the proportion required by the stoichiometric formula of the material, the total mass is roughly 2g, and roughly ground and mixed.

[0049] Step 2: In an atmosphere of high-purity argon, put the mixture into the 2 In the ball milling tank of the grinding balls, pour absolute ethanol as a coolant and seal it tightly. Afterwards, the sealed jar was put into a planetary ball mill, and ball milled for 24 hours at a speed of 600rps / min.

[0050] Step 3: Then take out the suspension sample, and carry out spray drying to remove the liquid while completing the spherical granulation of the precursor secondary particles.

[0051] Step 4: Put the sample in a tube furna...

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Abstract

The invention discloses a multi-element modified lithium-rich manganese-based positive electrode material and a preparation method thereof, comprising the following steps: coarsely grinding a lithium source, a metal oxide, a metal sulfide or a mixture of a metal sulfide and a metal fluoride and mix evenly; put the mixture into a ball mill tank and add absolute ethanol as a coolant, then seal it, and then put it in a ball mill to fully grind to obtain a lithium-rich manganese-based cathode material precursor; spray-dry, granulate; put in an inert The target product can be obtained by calcining in a gas atmosphere furnace. From the perspective of modifying lattice oxygen, the present invention introduces other variable valence non-metallic elements to replace part of the lattice oxygen, which not only greatly improves the problem of lattice oxygen precipitation and enhances the stability of the positive electrode material, but also provides considerable Specific capacity.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a multi-element modified lithium-rich manganese-based positive electrode material and a preparation method thereof. Background technique [0002] With the gradual depletion of fossil energy and the vigorous implementation of national development strategies, low-carbon and environmentally friendly new energy vehicles are increasingly favored by consumers. However, its prominent problems of short cruising range and slow charging have not been effectively resolved. Lithium-ion batteries are the core energy source in new energy vehicles, and their energy density and charging rate are of decisive significance to the improvement of the performance of new energy vehicles. Lithium-ion battery cathode material is one of the key factors affecting the specific capacity of lithium-ion batteries. At present, the commonly used commercial positive electrode materials mainly include ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/485H01M4/505H01M4/525H01M4/66H01M10/0525H01M4/48H01M4/04
CPCH01M4/0404H01M4/48H01M4/485H01M4/505H01M4/525H01M4/667H01M10/0525Y02E60/10
Inventor 高剑杨羽婷王铭谭铁宁
Owner SICHUAN PANOVASIC TECH
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