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Lithium battery positive-pole material, preparation method thereof and lithium-ion battery containing positive-pole material

A technology of lithium ion battery and positive electrode material, which is applied in the field of lithium battery positive electrode material, can solve the problems of low electronic conductivity and low lithium ion conductivity of the coating, achieve good lithium ion conductivity, improve cycle stability and rate performance , the effect of low manufacturing cost

Inactive Publication Date: 2016-03-23
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Simple solid-state reaction, it is difficult to form a dense coating layer on the surface of the spinel lithium nickel manganese oxide positive electrode material, so some side reactions inevitably exist in the 5V spinel lithium nickel manganese oxide system; at the same time, the currently used coating The coating materials are all metal oxides and phosphates. The electronic conductivity and lithium ion conductivity of these coatings are relatively low. Therefore, it is urgent to find a method for modifying the spinel lithium nickel manganese oxide cathode material. It can form a dense coating layer on the surface of spinel lithium nickel manganese oxide, and the coating layer has high electronic conductivity and lithium ion conductivity, so that the spinel lithium nickel manganese oxide cathode material has high cycle stability and rate performance

Method used

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  • Lithium battery positive-pole material, preparation method thereof and lithium-ion battery containing positive-pole material
  • Lithium battery positive-pole material, preparation method thereof and lithium-ion battery containing positive-pole material
  • Lithium battery positive-pole material, preparation method thereof and lithium-ion battery containing positive-pole material

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preparation example Construction

[0036] The present invention also relates to a preparation method of the spinel lithium nickel manganese oxide positive electrode material with a composite coating layer, which at least includes the following three steps:

[0037] (1) mixing the spinel lithium nickel manganese oxide positive electrode material with a zirconium-containing compound, a lanthanum-containing compound and a lithium salt;

[0038] Wherein: zirconium-containing compounds are selected from Zr(OH) 4 , ZrOCl 2 , ZrO 2 , ZrCl 4 , ZrF 4 At least one of; lanthanum-containing compounds selected from La 2 o 3 、LaCl 3 、LaF 3 At least one of; Lithium salt is selected from LiOH, Li 2 CO 3 At least one of them; the molar ratio of the zirconium-containing compound to the spinel lithium nickel manganese oxide positive electrode material is 10 -4 ~0.1:1, the molar ratio of lanthanum-containing compound to zirconium-containing compound is 0.5-2:1, the molar ratio of lithium salt to zirconium-containing comp...

Embodiment 1~4

[0044] A kind of spinel lithium nickel manganese oxide positive electrode material with composite cladding layer, the surface of the spinel lithium nickel manganese oxide positive electrode material has Li 7 La 3 Zr 2 o 12 and LiNbO 3 Composite coating layer, wherein the structure formula of spinel lithium nickel manganese oxide cathode material is LiM x+y Ni 0.5-x mn 1.5-y o 4 , M is one or more of Co, Al, Cr, Fe, Mg, Zr, Ti, 0≤x<0.5, 0≤y<1.5.

[0045] The preparation method of the lithium battery cathode material is as follows:

[0046] (1) fully mixing the spinel lithium nickel manganese oxide positive electrode material with zirconium-containing compound, lanthanum-containing compound and lithium salt;

[0047] (2) Mix and sinter the uniformly mixed samples to obtain Li-containing 7 La 3 Zr 2 o 12 The spinel lithium nickel manganese oxide positive electrode material of the first cladding layer;

[0048] (3) spinel lithium nickel manganese oxide with the first ...

Embodiment 5~8

[0066] A kind of spinel lithium nickel manganese oxide positive electrode material with composite cladding layer, the surface of the spinel lithium nickel manganese oxide positive electrode material has Li 7 La 3 Zr 2 o 12 and LiNbO 3 Composite coating layer, wherein the structure formula of spinel lithium nickel manganese oxide cathode material is LiM x+y Ni 0.5-x mn 1.5-y o 4 , M is one or more of Co, Al, Cr, Fe, Mg, Zr, Ti, 0≤x<0.5, 0≤y<1.5.

[0067] The procedure for preparing the positive electrode material for lithium batteries is the same as in Example 3, and the specific parameters are shown in Table 2.

[0068] Table 2:

[0069]

[0070]

[0071] The spinel lithium nickel manganese oxide positive electrode material with composite coating layer prepared according to the above specific parameters has similar rate performance and cycle stability as the positive electrode material in Example 3.

[0072] Such as Figure 7 with Figure 8 Shown, adopt the lith...

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Abstract

The invention belongs to the field of lithium-ion batteries and particularly relates to a lithium battery positive-pole material, a preparation method thereof and a lithium-ion battery containing the positive-pole material. The surface of the spinel lithium nickel manganese oxide positive pole material provided by the invention is coated with a composite coating layer, and the composite coating layer consists of a first coating layer containing Li7La3Zr2O12 and a second coating layer containing LiNbO3. The invention also relates to the preparation method for the spinel lithium nickel manganese oxide positive pole material, wherein the method comprises the steps: firstly, coating spinel lithium nickel manganese oxide with the first coating layer containing Li7La3Zr2O12 by a solid-phase method; then, coating spinel lithium nickel manganese oxide with a second coating layer containing LiNbO3 by a hydrothermal method. According to the spinel lithium nickel manganese oxide positive pole material with the composite coating layer, the cycle stability and rate capability of spinel lithium nickel manganese oxide are simultaneously improved, and meanwhile, influences such as dissolution and erosion to the positive pole material caused by an electrolyte during charging / discharging are reduced.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and specifically relates to a lithium battery cathode material, a preparation method thereof and a lithium ion battery containing the material. Background technique [0002] Compared with traditional lead-acid batteries, nickel-metal hydride batteries and other secondary batteries, lithium-ion batteries have the advantages of high energy density, high output voltage, low self-discharge, no memory effect and environmental friendliness, and have been widely used and developed. The performance of key materials for power and energy storage lithium-ion batteries is the ultimate decisive factor in battery performance, and the research on cathode materials has always been a hot spot for scientists. LiCoO 2 , LiMnO 4 、LiFePO 4 、LiNi x co y mn 1-x-y o 2 Cathode materials have been extensively studied. However, the lithium-ion battery system assembled with these positive electrode materials has...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M10/0525
CPCH01M4/366H01M4/485H01M4/505H01M4/525H01M10/0525H01M4/0471H01M4/131H01M4/1391Y02E60/10
Inventor 刘辉徐磊敏王亮王梦王巍柳娜
Owner NINGDE AMPEREX TECH
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