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Lithium-rich manganese based composite material, preparation method and application thereof

A technology of lithium-rich manganese-based and composite materials, which is applied in the field of lithium-ion batteries, can solve the problems of high material phase requirements, complex process, and no obvious improvement in voltage drop of lithium-rich manganese-based positive electrode materials, so as to improve cycle performance and voltage Attenuation effect

Inactive Publication Date: 2017-09-01
宁波富理电池材料科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the process of this method is relatively complicated, and the requirements on the material phase are relatively high, and the voltage drop of lithium-rich manganese-based cathode materials has not been significantly improved.

Method used

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  • Lithium-rich manganese based composite material, preparation method and application thereof
  • Lithium-rich manganese based composite material, preparation method and application thereof

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preparation example Construction

[0039] The present application also provides a method for preparing a lithium-rich manganese-based composite material as shown in formula (I), comprising the following steps:

[0040] Mixing the material shown in formula (II), the lithium-rich manganese-based material shown in formula (III) and an additive to obtain a mixed material, the additive is selected from one of citric acid, glucose, chitosan and sucrose one or more kinds;

[0041] heat-treating the mixed material to obtain a lithium-rich manganese-based composite material as shown in formula (I);

[0042] Li α Z β (PO 4 ) γ / xLi 2 MnO 3 ·(1-x)LiMO 2 (I);

[0043] Li α Z β (PO 4 ) γ (II);

[0044] wxya 2 MnO 3 ·(1-x)LiMO 2 (Ⅲ);

[0045] Among them, 1≤α≤3, 1≤β≤2, 1≤γ≤3, α, β and γ are natural numbers;

[0046] Z is selected from one or more of V, Ni and Co;

[0047] 0

[0048] Li mentioned in this application α Z β (PO 4 ) γ with xLi 2...

Embodiment 1

[0057] (1) 0.7kg lithium-rich manganese-based material 0.4Li 2 MnO 3 0.6LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 , 0.3kg triclinic Li 3 V 2 (PO 4 ) 3 Mix with 30g glucose for 3h using a mixer mill to obtain a mixed material;

[0058] (2) Place the above mixed material in an argon protective atmosphere, and anneal at 400° C. for 3 hours to obtain a lithium-rich manganese-based composite positive electrode material with the general formula (IV);

[0059] Li 3 V 2 (PO 4 ) 3 / 0.4Li 2 MnO 3 0.6LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 (Ⅳ).

Embodiment 2

[0061] (1) 0.5kg lithium-rich manganese-based material 0.4Li 2 MnO 3 0.6LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 , 0.5kg triclinic Li 3 V 2 (PO 4 ) 3 Mix 3h with 40g chitosan with a mixer mill to obtain a mixed material;

[0062] (2) placing the above mixed material in an argon protective atmosphere, annealing at 450° C. for 3 hours to obtain a lithium-rich manganese-based composite cathode material with the general formula (IV);

[0063] Li3 V 2 (PO 4 ) 3 / 0.4Li 2 MnO 3 0.6LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 (Ⅳ).

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Abstract

The invention provides a lithium-rich manganese based composite material shown as formula (I), and also provides a preparation method of the lithium-rich manganese based composite material. The method includes the steps of: mixing a material shown as formula (II), a lithium-rich manganese based material shown as formula (III) and an additive to obtain a mixed material, wherein the additive is selected from one or more of citric acid, glucose, chitosan and sucrose; and conducting heat treatment on the mixed material so as to obtain the lithium-rich manganese based composite material shown as formula (I). The lithium-rich manganese based composite material prepared by the method provided by the invention has the characteristics of excellent cycle performance and improved voltage drop, etc. In addition, the method has simple process engineering and is easy for realizing industrialization. LialphaZbeta(PO4)gamma / xLi2MnO3.(1-x)LiMO2 (I).

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium-rich manganese-based composite material, its preparation method and its application. Background technique [0002] Lithium-ion batteries have the advantages of high energy, long life, and no memory effect, and are considered to be the most potential power batteries for electric vehicles. However, the performance and cost of the current power lithium battery cannot meet the needs of the market, especially the high energy density, one of the key performance indicators. Improving the energy density of the battery is mainly to increase the energy density of the electrode material, and there are two ways to increase the energy density of the electrode material to increase the specific capacity of the material and the working voltage. So far, commercial cathode materials include lithium cobaltate, lithium manganate, nickel-cobalt-manganese ternary materials and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/58H01M4/62H01M10/0525
CPCH01M4/364H01M4/505H01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 袁国霞何逸夏永高刘兆平
Owner 宁波富理电池材料科技有限公司
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