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A kind of positive electrode active material of lithium ion battery and its preparation method and lithium ion battery

A cathode active material, lithium-ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as difficulty in meeting high-capacity requirements for batteries, low capacity, and low energy density of lithium-ion batteries, and achieve excellent Discharge capacity, high capacity and good conductivity

Active Publication Date: 2021-10-12
SHENZHEN DYNANONIC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, commonly used cathode materials for lithium-ion batteries include lithium cobalt oxide (LiCoO 2 ), lithium manganate (LiMn 2 o 4 ), and lithium iron phosphate (LiFePO 4 ), etc., the actual specific capacity of these three materials is mostly less than 160mAh / g. Due to the low capacity, the energy density of lithium-ion batteries made of these electrode materials is low, and it is difficult to meet the high capacity requirements of batteries for materials.

Method used

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  • A kind of positive electrode active material of lithium ion battery and its preparation method and lithium ion battery
  • A kind of positive electrode active material of lithium ion battery and its preparation method and lithium ion battery
  • A kind of positive electrode active material of lithium ion battery and its preparation method and lithium ion battery

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preparation example Construction

[0045] The second aspect of the present invention provides a kind of preparation method of positive electrode active material of lithium ion battery, comprises the following steps:

[0046] Provide A precursor; A is LiM 1 PO 4 、LiM 2 o 2 and LiM 3 2 o 4 At least one of M 1 , M 2 or M 3 At least one selected from iron, cobalt, manganese, nickel, aluminum and vanadium, in a protective gas or air, the A precursor is pre-fired at a constant temperature of 200-500 ° C for 1-5 hours, and then naturally cooled to room temperature, Obtain the pre-burned A precursor;

[0047] Provide LiC 6 Precursor;

[0048] The pre-fired A precursor and LiC 6 After the precursor is mixed evenly according to the molar ratio of 1-x:x, the precursor of the positive electrode active material of the lithium ion battery is obtained, 01-x ·(LiC 6 ) x , 0<x<1.

[0049] In the embodiment of the present invention, the preparation method of the A precursor can be an existing common method, such a...

Embodiment 1

[0104] A preparation method for a positive electrode active material of a lithium ion battery, comprising the following steps:

[0105] (1) Preparation of LiFePO 4 Precursor

[0106] 1mol of LiH 2 PO 4 Dissolve in water to form LiH 2 PO 4 solution, put 1 mol of elemental iron in glacial acetic acid, and LiH 2 PO 4 Mix the solutions to obtain a mixed solution, heat the mixed solution to 40°C, react for 100 minutes, and spray dry after the reaction to obtain nano-sized LiFePO 4 precursor; in argon gas, LiFePO 4 After the precursor and artificial graphite are mixed, they are pre-fired at a constant temperature of 200°C for 5 hours, and then cooled to room temperature naturally to obtain a pre-fired A precursor; the surface of the pre-fired A precursor is covered with a first carbon layer;

[0107] (2) Preparation of LiC 6 Precursor

[0108] Provide an electrochemical cell with C as the cathode, Li as the anode, and lithium hexafluorophosphate as the electrolyte. In argon ...

Embodiment 2

[0120] A preparation method for a positive electrode active material of a lithium ion battery, comprising the following steps:

[0121] (1) Preparation of LiFePO 4 Precursor

[0122] 1mol of LiH 2 PO 4 Dissolve in water to form LiFePO 4 solution, put 1 mol of elemental iron in glacial acetic acid, and LiH 2 PO 4 Mix the solutions to obtain a mixed solution, heat the mixed solution to 40°C, react for 100 minutes, and spray dry after the reaction to obtain nano-sized LiFePO 4 precursor; in argon gas, LiFePO 4 After the precursor and artificial graphite are mixed, they are pre-fired at a constant temperature of 500°C for 1 hour, and then cooled to room temperature naturally to obtain a pre-fired A precursor; the surface of the pre-fired A precursor is covered with a first carbon layer;

[0123] (2) Preparation of LiC 6 Precursor

[0124] Provide an electrochemical cell with C as the cathode, Li as the anode, and lithium hexafluorophosphate as the electrolyte. In argon ga...

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Abstract

The present invention provides a lithium ion battery positive active material. The chemical expression of the lithium ion battery positive active activity material is (A) 1‑x · (LIC 6 Cure x , 0 <x <1, A is Lim 1 PO 4 , Lim 2 O 2 Lim 3 2 O 4 At least one of them, M, 1 M 2 M 3 There are at least one of the iron, cobalt, manganese, nickel, aluminum, and 钒. The capacity of lithium ion batteries provided by the present invention is high. The present invention also provides a preparation method for lithium ion battery positive active materials, including the following steps: provides A front drive and LIC respectively 6 Out - - -over; In protective gases or air, the front drive A is naturally cooled to room temperature after the pre -fever of 200‑500 ° C constant temperature pre -fever, and the pre -fever A front drive body is obtained. And LIC 6 The front -wheel drive is mixed with Moore as: X mixing uniformly, and obtains the front -drive body of the lithium ion battery positive active activity material, and then in the protective gas, the front drive of the lithium -ion battery positive active activity material is burned for 5min at a constant temperature at 300‑700 ° C for 5min.锂 2H, obtains a lithium ion battery positive active material. The preparation method of the present invention is unique and effective.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to a lithium-ion battery cathode active material, a preparation method thereof, and a lithium-ion battery. Background technique [0002] As portable electronic devices and electric vehicles have higher and higher energy density requirements for lithium-ion batteries, the research and development of lithium-ion battery materials with high energy density is becoming increasingly important. [0003] At present, commonly used cathode materials for lithium-ion batteries include lithium cobalt oxide (LiCoO 2 ), lithium manganate (LiMn 2 o 4 ), and lithium iron phosphate (LiFePO 4 ), etc., the actual specific capacity of these three materials is mostly less than 160mAh / g. Due to the low capacity, the energy density of lithium-ion batteries made of these electrode materials is low, and it is difficult to meet the high capacity requirements of batteries for materials. Therefore, it i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M4/587H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/5825H01M4/583H01M4/587H01M4/625H01M10/0525Y02E60/10
Inventor 尚伟丽孔令涌方东升李佳佳黄少真
Owner SHENZHEN DYNANONIC