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A surface-coated doped lithium manganate spherical secondary particle and its preparation method and application

A technology of surface coating and secondary particles, applied in secondary batteries, structural parts, electrical components, etc., can solve the problems of poor morphology, poor uniformity, unfavorable lithium manganate surface coating modification, etc.

Active Publication Date: 2021-04-16
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The morphology of lithium manganese oxide basically maintains the morphology of electrolytic manganese dioxide, which is mainly determined by the crushing process. The current process is difficult to ensure that the morphology of manganese dioxide is a regular spherical shape, and the uniformity is very poor, resulting in the formation of lithium manganese oxide. The morphology is poor, which is not conducive to the surface coating modification of lithium manganate

Method used

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  • A surface-coated doped lithium manganate spherical secondary particle and its preparation method and application
  • A surface-coated doped lithium manganate spherical secondary particle and its preparation method and application
  • A surface-coated doped lithium manganate spherical secondary particle and its preparation method and application

Examples

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Embodiment 1

[0032] Embodiment 1: by Al 2 o 3 +B 2 o 3 Encapsulated Nb-doped LiNb 0.02 mn 1.98 o 4

[0033] A surface-coated doped lithium manganate spherical secondary particle, the general formula of the doped lithium manganate spherical secondary particle is LiNb 0.02 mn 1.98 o 4 , where the doping element is Nb, x is 0.02, and the surface cladding layer is B 2 o 3 and Al 2 o 3 .

[0034] A preparation method of surface-coated doped lithium manganate spherical secondary particles, comprising

[0035] Step a: Lithium carbonate, manganese dioxide, manganese oxide and trimanganese tetraoxide, and niobium oxide are mixed, and the molar ratio (MnO 2 ):(MnO):(Mn 3 o 4 )=7:2:1, (Li 2 CO 3 ):(MnO 2 +MnO+Mn 3 o 4 )=3:1, (Nb) / (Mn)=1 / 99, ball milled for 7 hours after mixing and mixed evenly to obtain powder A;

[0036] Step b: Heat powder A to 450°C and keep it warm for 8 hours to obtain powder B;

[0037] Step c: heating powder B to 780°C and keeping it warm for 15 hours to...

Embodiment 2

[0046] Embodiment 2: by Al 2 o 3 +B 2 o 3 Encapsulated Al-doped LiAl 0.02 mn 1.98 o 4

[0047] A surface-coated doped lithium manganese oxide spherical secondary particles, the general formula of doped lithium manganate spherical secondary particles is LiAl 0.02 mn 1.98 o 4 , where the doping element is Al, x is 0.02, and the surface cladding layer is B 2 o 3 and Al 2 o 3 . The specific preparation method is basically the same as that of Example 1, the only difference being that alumina is mixed in step a.

Embodiment 3

[0048] Embodiment 3: by Al 2 o 3 +B 2 o 3 Encapsulated Ni-doped LiNi 0.02 mn 1.98 o 4

[0049] A surface-coated doped lithium manganate spherical secondary particle, the general formula of the doped lithium manganate spherical secondary particle is LiNi 0.02 mn 1.98 o 4 , where the doping element is Ni, x is 0.02, and the surface cladding layer is B 2 o 3 and Al 2 o 3 . The specific preparation method is basically the same as in Example 1, the only difference being that nickel oxide is mixed in step a.

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Abstract

The present invention disclosed a kind of doped lithium manganate spherical secondary particles and its preparation methods and applications. x Mn 2‑x O 4 Among them, the doped element m is one in NB, AL or Ni, the value range of X is 0 <x ≤ 1 / 3, and the surface covering layer is B. 2 O 3 With AL 2 O 3 One or two of them.The advantage of the present invention is that the prepared secondary particles are uniform, and the surface coating layer is dense and uniform; the preparation method has outstanding advantages such as simple steps, convenient operation, and low prices.Use, good safety and stable structure.

Description

technical field [0001] The invention relates to the technical field of new energy, in particular to a surface-coated doped lithium manganate spherical secondary particle, a preparation method thereof, and an application as a positive electrode material of a lithium ion battery. Background technique [0002] Lithium-ion batteries have outstanding advantages such as high monomer voltage, large specific energy, long cycle life, and environmental friendliness, so they quickly occupy an important position in the market of portable electronic consumer goods such as mobile phones and notebook computers, and become an indispensable part of people's daily life. component. The current lithium-ion battery cathode materials are mainly composed of lithium cobaltate, lithium iron phosphate, ternary materials, lithium-rich manganese-based materials, etc. Among them, LiCoO 2 As a positive electrode material, it has the advantages of high specific energy, good cycle performance, and simple...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M10/0525
CPCY02E60/10
Inventor 杨俊峰李春流张临超谢卓明杨瑞芳张涛王先平方前锋
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI