Multi-element lithium-rich manganese-based positive electrode material and preparation method and application thereof

A lithium-rich manganese-based, cathode material technology, applied in the field of electrochemistry, can solve problems such as complex preparation methods, achieve the effects of simple preparation methods, conducive to large-scale production, and avoid lithium loss

Inactive Publication Date: 2020-02-18
INST OF PROCESS ENG CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This preparation method needs to coat the lithium nickel manganese oxide material, and the preparation method is relatively complicated.

Method used

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  • Multi-element lithium-rich manganese-based positive electrode material and preparation method and application thereof
  • Multi-element lithium-rich manganese-based positive electrode material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] This embodiment provides a multi-element lithium-rich manganese-based positive electrode material Li 2 mn 0.5 Ti 0.1 V 0.2 Mo 0.1 o 2 The preparation method of F, described preparation method comprises the steps:

[0053] Mix lithium hydroxide, manganese oxide, titanium dioxide, vanadium pentoxide, molybdenum trioxide and lithium fluoride according to the stoichiometric ratio, and then ball mill the mixture for 80 hours under an argon atmosphere with a ball-to-material ratio of 5:1 to obtain the multi-component rich Lithium-manganese-based cathode materials.

[0054] The scanning electron microscope image of the obtained multivariate lithium-rich manganese-based cathode material is as follows figure 1 As shown, it can be seen from the figure that the obtained positive electrode material is micron-sized spherical particles with regular shape and relatively dense particles.

Embodiment 2

[0056] This embodiment provides a multi-element lithium-rich manganese-based positive electrode material Li 2 mn 0.75 Zr 0.1 V 0.1 W 0.1 o 2 The preparation method of F, described preparation method comprises the steps:

[0057] Mix lithium oxide, manganese carbonate, zirconia, vanadium trioxide, tungsten trioxide and lithium fluoride according to the stoichiometric ratio, and then ball mill the mixture for 30 hours under a nitrogen atmosphere with a ball-to-material ratio of 10:1 to obtain the multi-element lithium-rich Manganese-based cathode materials.

Embodiment 3

[0059] This embodiment provides a multi-element lithium-rich manganese-based positive electrode material Li 2 mn 0.675 Ti 0.05 Nb 0.05 Cr 0.2 o 2 The preparation method of F, described preparation method comprises the steps:

[0060] Lithium carbonate, manganese acetate, tetrabutyl titanate, niobium trioxide, chromium trioxide and lithium fluoride were mixed according to the stoichiometric ratio, and then the mixture was ball milled for 5 h under a helium atmosphere with a ball-to-material ratio of 30:1 to obtain the obtained The multi-element lithium-rich manganese-based cathode material is described.

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Abstract

The invention relates to a multi-element lithium-rich manganese-based positive electrode material and a preparation method and application thereof. The chemical formula of the multi-element lithium-rich manganese-based positive electrode material is expressed as Li2MnaMxM'yM''zO2B, a is greater than or equal to 0.5 and less than 1, x is greater than 0 and less than 1, y is greater than 0 and lessthan 1, and z is greater than 0 and less than 1; B is a halogen element; M is a +4 valence metal; M' is a +5 valence metal; M'' is a +6 valence metal, and Mn is +2 valence. According to the multi-element lithium-rich manganese-based positive electrode material provided by the invention, various high-valence cations are introduced at the same time, and halogen elements are introduced, so that the valence state of Mn and the reaction activity of O are reduced, the stability of the obtained lithium ion battery positive electrode material is improved, and the obtained lithium ion battery positiveelectrode material has the advantages of high voltage and high reversible specific capacity.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and relates to a battery positive electrode material and its preparation method and application, in particular to a multi-element lithium-rich manganese-based positive electrode material and its preparation method and application. Background technique [0002] With the vigorous development of new energy vehicles, the lithium-ion battery industry has entered a stage of rapid development. The key materials that affect the performance of lithium-ion batteries mainly include positive electrode materials, negative electrode materials, and electrolytes. Among them, the cathode material is currently the main factor limiting the battery performance. [0003] To achieve large-scale application of lithium-ion batteries, it is necessary to meet a series of requirements such as low cost, safety, not limited by natural resources, and high energy density. The positive electrode materials of lithium-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/505H01M10/0525
CPCH01M4/485H01M4/505H01M10/0525Y02E60/10
Inventor 谭强强夏青
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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