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Ternary cathode material having high electric conductivity and preparation method thereof

A technology of positive electrode materials and ternary materials, applied in the field of ternary positive electrode materials and their preparation, can solve the problems of increasing the surface impedance of ternary materials and the small specific capacity of the material for the first discharge, and achieve the effect of inhibiting decomposition and protecting the material structure

Active Publication Date: 2019-02-01
QINGYUAN JIAZHI NEW MATERIAL RES INST CO LTD +1
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Problems solved by technology

Under this condition, modifying the surface of the ternary material with metal oxide can solve this problem well and increase the cycle performance of the material, but the modification with metal oxide will bring a new problem, that is, it will increase The surface impedance of the ternary material makes the material's first discharge specific capacity small

Method used

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Experimental program
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Embodiment 1

[0037] A method for preparing a ternary positive electrode material with high conductivity, comprising the following steps 1) configuring a multi-component mixed solution of nickel salt, cobalt salt and manganese salt, in the mixed solution, the stoichiometric ratio Ni:Co:Mn=5:2: 3.

[0038] 2) Add the multi-component mixed solution of step 1) to the reaction device containing the bottom liquid in parallel with ammonia water and sodium hydroxide solution, and carry out co-precipitation reaction to obtain the precursor of sodium hydroxide; the whole process is carried out in N 2 Under the protection of the atmosphere;

[0039] 3) filtering the reaction product of step 2) to obtain a precipitate, and washing with deionized water until the filtrate is neutral;

[0040] 4) Dry in a hot air circulation oven for 10-12 hours to obtain Ni 0.5 co 0.2 mn 0.3 (OH) 2 Precursor;

[0041] 5) Combine the ternary precursor of step 4) with Li 2 CO 3 According to the stoichiometric rati...

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Abstract

A ternary cathode material having high electric conductivity is characterized by including a core and a shell coating the core and having the chemical formula of LicNiaCobMn<1-a-b>O2; 0 <= a <= 1, 0 <= b <= 1, 0.4 <= c <= 1.5. The core is a lithium-coated Ni-Co-Mn ternary material. The shell is a conductive polymer film. In the invention, the thin film of the shell has high electric conductivity,so that surface resistance of the ternary material can be reduced, thus improving rate capability of a battery. Meanwhile, the ternary cathode material can be combined with a binder better, so that increase of resistance during charge / discharge processes can be inhibited to certain degree, thereby improving cycle performance of the material.

Description

technical field [0001] The invention relates to a lithium ion battery, in particular to a ternary positive electrode material with high electrical conductivity of the lithium ion battery and a preparation method thereof. Background technique [0002] Currently, fossil fuels remain the main source of electricity. However, with the unreasonable mining and utilization of human beings, the shortage of fossil energy is becoming increasingly serious, and the environmental pollution is becoming more and more serious. Therefore, the development and utilization of new clean resources and renewable energy, such as solar energy, wind energy, tidal energy, etc., has become a top priority. But on the other hand, the normal operation of the power grid requires stable and continuous power generation. Solar energy, wind energy, and tidal energy are restricted by factors such as weather, location, and time, which greatly limits their large-scale application and popularization. To solve thi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M4/60H01M10/0525
CPCH01M4/366H01M4/485H01M4/505H01M4/525H01M4/602H01M10/0525Y02E60/10
Inventor 罗利琼黄家奇郑世林付海阔
Owner QINGYUAN JIAZHI NEW MATERIAL RES INST CO LTD
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