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Method for synthesizing lithium ion battery positive electrode material

A lithium-ion battery and positive electrode material technology, applied in the field of materials, can solve the problems of uncontrollable thickness, unevenness, and high charging and discharging current of the battery, and achieve the effects of uniform and controllable thickness, reducing side reactions, and improving stability

Inactive Publication Date: 2015-12-30
SHANGHAI ELECTRICGROUP CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of this, the invention provides a kind of synthetic method of lithium-ion battery cathode material, solves the problem of existing LiMn 2 o 4 In the positive electrode material coating technology, the optional coating layer materials are limited, and the coating layer is difficult to realize nanometerization, and the thickness is uncontrollable and uneven, and problems such as excessive local current are prone to occur during battery charging and discharging.

Method used

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  • Method for synthesizing lithium ion battery positive electrode material
  • Method for synthesizing lithium ion battery positive electrode material
  • Method for synthesizing lithium ion battery positive electrode material

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preparation example Construction

[0028] Such as figure 1 Shown in, the synthetic method of a kind of lithium ion battery cathode material of the embodiment of the present invention, concrete steps are:

[0029] Step 1, preparing spinel lithium manganese oxide LiMn 2 o 4 , in the embodiment of the present invention, spinel lithium manganese oxide LiMn 2 o 4 It can also be doped with one or more elements of other metal elements to form a doping compound LiM x mn 2-x o 4 . Here the doping element M includes the first and second main elements, transition metal elements and rare earth elements in the periodic table of elements, such as Na, K, Zn 2+ , Mg 2+ 、Al 3+ 、Cu 2+ 、Co 3+ 、Cr 3+ , Fe 3+ , V 4+ , La 3+ Wait.

[0030] Step 2, dissolving lithium nitrate, lanthanum nitrate and isopropyl titanate into 50mL of isopropanol according to the atomic ratio of 1:1:2 to prepare an isopropanol solution;

[0031] Step 3, then the LiMn obtained in the above step 1 2 o 4 Or single / multiple metal doped LiM ...

Embodiment 1

[0036] Such as figure 2 As shown in, the method of the present invention is used to synthesize the coating amount of 1wt.% Li 0.35 La 0.55 TiO 3 Coated spinel lithium manganese oxide LiMn 2 o 4 , it can be seen by transmission electron microscopy that the thickness of the cladding layer is 5nm. When charged and discharged at 1 / 2C, the initial capacity of the material is 105.0mAh / g, after 300 high-temperature cycles, the capacity is 76.1mAh / g, and the capacity retention rate is 72.5%.

Embodiment 2

[0038] Such as image 3 As shown in, the method of the present invention is used to synthesize Li with a coating amount of 3wt% 0.35 La 0.55 TiO 3 Coated spinel lithium manganese oxide LiMn 2 o 4 , it can be seen by transmission electron microscopy that the thickness of the cladding layer is 10nm. When charged and discharged at 1 / 2C, the initial capacity of the material is 104.4mAh / g, after 300 high-temperature cycles, the capacity is 82.3mAh / g, and the capacity retention rate is 78.3%.

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Abstract

The invention discloses a method for synthesizing a lithium ion battery positive electrode material. The method comprises the following steps: dissolving lithium nitrate, lanthanum nitrate and titanium tetraisopropanolate in isopropyl alcohol to prepare an isopropyl alcohol solution; adding spinel-type lithium manganate into the isopropyl alcohol solution for stirring, and carrying out 1-3 hours' heat treatment at 300-400 DEG C to prepare Li0.35La0.55TiO3 coated spinel-type lithium manganate. According to the technical scheme, the method has the advantages that nanocrystallization of a coating layer can be effectively realized, and the coating thickness is uniform and controllable; through the coating layer with a nano-sized surface, the contact between LiMn2O4 and an electrolyte can be effectively reduced, side reactions triggered in a charge-discharge process of a lithium ion battery can be reduced, the stability of the lithium ion battery can be improved, and the high-temperature cycle life of the lithium ion battery can be prolonged.

Description

technical field [0001] The invention belongs to the field of materials, and relates to a method for manufacturing a material upper coating, in particular to a solid electrolyte Li 0.35 La 0.55 TiO 3 Coated lithium-ion battery cathode material spinel lithium manganese oxide LiMn 2 o 4 synthetic method. Background technique [0002] With the depletion of petroleum resources and the aggravation of environmental pollution, battery-powered hybrid electric vehicles and pure electric vehicles have become a global hot topic. Recently, countries around the world have given significant support to the development of electric vehicles and formulated corresponding development plans, hoping to alleviate the increasingly serious energy crisis and air pollution problems. At present, large lithium-ion batteries are considered to be the most potential automotive power batteries. Many automobile manufacturers at home and abroad are embarking on the research of lithium-ion batteries for v...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/505H01M4/628H01M10/0525Y02E60/10
Inventor 刘佳丽卞沛文曾乐才姚一一苏青余爱水商业盛
Owner SHANGHAI ELECTRICGROUP CORP
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