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Preparation method of ternary cathode material

A technology of positive electrode material and mixed solution, which is applied in the field of preparation of ternary positive electrode materials, can solve the problems of low tap density, low capacity, and low cycle performance, and achieve the effects of high tap density, high capacity, and high cycle performance

Inactive Publication Date: 2016-01-20
SICHUAN KENENG LITHIUM BATTERY
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Problems solved by technology

[0004] The invention provides a preparation method of a ternary positive electrode material, which solves the problems of the high-nickel LiNi0.7Co0.15Mn0.15O2 ternary positive electrode material in the prior art, and the product has low tap density, low capacity, and poor cycle performance. low technical problems, and realize the technical effect that the products manufactured by this method have high tap density, high capacity and high cycle performance

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  • Preparation method of ternary cathode material

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[0017] The invention provides a preparation method of a ternary positive electrode material, which solves the problems of the high-nickel LiNi0.7Co0.15Mn0.15O2 ternary positive electrode material in the prior art, and the product has low tap density, low capacity, and poor cycle performance. Low technical problems, the technical effects of high tap density, high capacity and high cycle performance of the products manufactured by the method are realized.

[0018] In order to better understand the above-mentioned technical solution, the above-mentioned technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

Embodiment 1

[0021] Please refer to figure 1 , on the basis of the existing 532 series ternary material production, this application adopts the self-developed co-precipitation method, lithium mixing and roasting synthesis process, and performs cation doping modification and surface carbon coating technology in the liquid phase to produce high nickel LiNi0.7Co0.15Mn0.15O2 ternary cathode material, the product has the advantages of high tap density, high capacity and high cycle performance.

[0022] 1. Key technologies and processes

[0023] (1) Co-precipitation process to prepare the key technology of nickel-drill-manganese ternary material precursor with dense crystallization, moderate material particle size and narrow particle size distribution;

[0024] (2) The key process of cationic doping modification pretreatment after washing and pressing the precursor;

[0025] (3) The key technology of controlling the material structure and electrochemical performance by adjusting the lithium co...

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Abstract

The invention discloses a preparation method of a ternary cathode material. The method comprises the following steps of 1, uniformly mixing and integrating a salt ingredient and an alkali ingredient in a solution mode to form a mixture solution; 2, carrying out deposition on the mixture solution formed in the step 1 to form precursor grains, and controlling core formation and a crystal growth speed of co-precipitation reaction through parameter adjustment; 3, adding positive ions in a liquid phase to the precursor grains for doping modification after carrying out washing and filter pressing on the precursor grains formed in the step 2, and drying the precursor grains; and 4, adding lithium to the dried raw material, and carrying out calcination and surface coating modification to obtain a finished product of the ternary material. By the method, the product manufactured according to the method has technical effects of high tap density, high capacity and high cycle performance.

Description

technical field [0001] The invention relates to the field of preparation of ternary materials, in particular to a method for preparing a ternary positive electrode material. Background technique [0002] The conventional battery cathode material is lithium cobalt oxide LiCoO 2 , the ternary material is Li(NiCoMn)O 2 , The precursor product of ternary composite cathode material is based on nickel salt, cobalt salt, and manganese salt. The ratio of nickel, cobalt, and manganese in it can be adjusted according to actual needs. Require. [0003] In recent years, LiNi0.7Co0.15Mn0.15O2 ternary material has high voltage, high specific energy density, and price compared with LiCoO 2 Low cost and other advantages, has been considered as LiCoO 2 best alternative material. However, the high-nickel LiNi0.7Co0.15Mn0.15O2 ternary cathode material in the prior art has technical problems of low tap density, low capacity and low cycle performance. Contents of the invention [0004] T...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62
CPCH01M4/362H01M4/505H01M4/525H01M4/626H01M4/628H01M2004/028H01M2220/30Y02E60/10
Inventor 李延俊岳波向中林王俊安黄小丽周俊杰
Owner SICHUAN KENENG LITHIUM BATTERY
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