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Lithium nickel manganese oxide positive electrode material, preparation method thereof and lithium ion battery

A cathode material, lithium nickel manganese oxide technology, applied in the field of preparation of cathode materials for lithium ion batteries, can solve the problems of poor structural stability, poor electrochemical performance and the like

Pending Publication Date: 2021-12-28
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The main purpose of the present invention is to provide a lithium nickel manganese oxide positive electrode material, its preparation method and lithium ion battery, to solve the poor structural stability of the lithium nickel manganese oxide positive electrode material obtained by the existing sol-gel method, which leads to its electrochemical performance. bad question

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  • Lithium nickel manganese oxide positive electrode material, preparation method thereof and lithium ion battery
  • Lithium nickel manganese oxide positive electrode material, preparation method thereof and lithium ion battery
  • Lithium nickel manganese oxide positive electrode material, preparation method thereof and lithium ion battery

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preparation example Construction

[0025] As described in the background art, the lithium nickel manganese oxide positive electrode material produced by the existing sol-gel method has the problem of poor structural stability, resulting in poor electrochemical performance. In order to solve the above technical problems, the application provides a method for preparing a spinel lithium nickel manganese oxide positive electrode material, the preparation method of the above lithium nickel manganese oxide positive electrode material comprises: lithium source, manganese source and nickel source, water, β -Cyclodextrin, complexing agent and alkaline regulator carry out gel reaction to obtain precursor gel, wherein, the molar ratio of the lithium element in the lithium source, the nickel element in the nickel source and the manganese element in the manganese source is (1.00~1.06):(0.45~0.55):(1.45~1.85); the precursor gel is dehydrated and calcined to obtain lithium nickel manganese oxide cathode material.

[0026] The...

Embodiment 1

[0045] (1) The CH 3 COOLi, Ni(CH 3 COO) 2 4H 2 O and Mn(CH 3 COO) 2 4H 2 O was dissolved in 500 mL of deionized water, and stirred with a mechanical stirrer at a speed of 300 rpm for 40 min at room temperature to obtain a transparent solution. Then, 283.74 g and 0.25 mol of β-cyclodextrin were added to the transparent solution and stirred evenly to obtain a mixed solution, so that the concentration of β-cyclodextrin in the mixed solution was 0.5 mol / L.

[0046] (2) Weigh 283.74g, 1.48mol of citric acid, and the weight ratio of β-cyclodextrin to citric acid is 1:1, dissolve in an appropriate amount of deionized water and mix evenly to dissolve the citric acid, add step (1) In the prepared mixed solution; wherein the molar ratio of Ni:β-cyclodextrin:citric acid is 0.5:0.0125:0.074.

[0047] (3) Mix the mixed solution prepared in step (2) with alkaline regulator ammonia water, adjust the pH of the solution to 6.5, then transfer the above solution to a constant temperature ...

Embodiment 2

[0053] The difference from Example 1 is that the lithium source is lithium ethoxide, and the molar ratio of the lithium element in the lithium source, the nickel element in the nickel source, and the manganese element in the manganese source is 1.00:0.45:1.55.

[0054] According to the XRD test results, it can be seen that the chemical formula of the lithium nickel manganese oxide cathode material prepared in this embodiment is Li 1.00 Ni 0.45 mn 1.55 o 4 . The test results of electrochemical performance parameters are shown in Table 1.

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Abstract

The invention provides a lithium nickel manganese oxide positive electrode material, a preparation method thereof and a lithium ion battery. The preparation method of the lithium nickel manganese oxide positive electrode material comprises the steps that a lithium source, a nickel source, a manganese source, water, beta-cyclodextrin, a complexing agent and an alkaline regulator are subjected to a gel reaction, a precursor gel is obtained, wherein the molar ratio of lithium elements in the lithium source to nickel elements in the nickel source to manganese elements in the manganese source is (1.00-1.06): (0.45-0.55): (1.45-1.85); and dehydrating and calcining of the precursor gel are carried out to obtain the lithium nickel manganese oxide positive electrode material. According to the preparation method, anchoring of nickel and manganese can be realized, so that the probability of mixed arrangement of lithium ions and nickel ions in the lithium nickel manganese oxide positive electrode material is reduced, the structural stability of the lithium nickel manganese oxide positive electrode material is improved, a spinel type structure is formed, and the prepared lithium nickel manganese oxide positive electrode material has good first discharge efficiency, rate capability, capacity recovery and cycling stability.

Description

technical field [0001] The invention relates to the technical field of preparation of positive electrode materials for lithium ion batteries, in particular to a lithium nickel manganese oxide positive electrode material, a preparation method thereof and a lithium ion battery. Background technique [0002] The power battery of electric vehicles needs to have the characteristics of high power and high energy performance. Now commonly used power batteries mainly include lithium cobalt oxide (LiCoO 2 ) batteries, lithium iron phosphate (LiFePO 4 ) batteries and spinel lithium nickel manganese oxide (LiNi 0.5 mn 1.5 o 4 )Battery. Among them, lithium cobalt oxide (LiCoO 2 ) The working discharge voltage platform of the battery is relatively low, only 3.7V, and the lack of cobalt resources causes its production cost to increase, and it is harmful to the environment. Lithium iron phosphate (LiFePO 4 ) The discharge voltage platform of the battery is lower, only 3.2V. The sp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M4/505H01M4/525H01M10/0525H01M10/058
CPCC01G53/50H01M4/505H01M4/525H01M10/058H01M10/0525C01P2002/72C01P2004/03C01P2004/61Y02E60/10Y02P70/50
Inventor 白艳张树涛李子郯王壮王亚州马加力潘海龙魏赫陈素杰
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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