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Method for preparing low-cobalt positive electrode material by sol-gel-solid phase sintering method

A solid-phase sintering method and cathode material technology, which is applied in the field of C01G, can solve the problems affecting the crystal structure and electrical properties of low-cobalt or even cobalt-free cathode materials, uneven porous structure pore size, easy shrinkage and collapse, etc., to achieve excellent cycle Stability, elimination of local variability problem, effect of avoiding dust problem

Pending Publication Date: 2021-11-23
宁夏汉尧富锂科技有限责任公司 +1
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Problems solved by technology

[0004] However, when the sol-gel method is used to prepare low-cobalt and cobalt-free cathode materials, the pore size of the obtained porous structure is not uniform, and it is easy to shrink and collapse during the drying and sintering process, which affects the crystal of low-cobalt or even cobalt-free cathode materials. Structure and Electrical Properties

Method used

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  • Method for preparing low-cobalt positive electrode material by sol-gel-solid phase sintering method
  • Method for preparing low-cobalt positive electrode material by sol-gel-solid phase sintering method
  • Method for preparing low-cobalt positive electrode material by sol-gel-solid phase sintering method

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Embodiment example

[0041] This example provides a method for preparing positive electrode materials, including:

[0042] Lithium salt sol preparation: take 35mL methanol, add 2.5mL lithium methoxide under stirring state, add 10mL water and 35mL tetrahydrofuran, mix, add 50mL tri-n-butyl borate at a rate of 20mL / h, stir for 30min, and obtain lithium salt sol ;

[0043] Preparation of low-cobalt precursor dispersion: take D prepared by batch co-precipitation method 50 3.5μm low cobalt ternary hydroxide precursor Ni 0.55 co 0.05 mn 0.40 (OH) 2 10.0 g was added to methanol, and stirred at 500 r / min for 2.5 h to obtain a low-cobalt precursor dispersion; the molar ratio of the lithium element in the lithium methoxide to the total moles of nickel, cobalt, and manganese in the precursor was 1.045:1;

[0044] Mixed gel preparation: Add the low-cobalt precursor dispersion into the lithium salt sol, stir at 300r / min for 4.0h, and store in a blast drying oven at 35°C for 12h to obtain a mixed gel;

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Abstract

The invention relates to C01G, in particular to a method for preparing a low-cobalt positive electrode material by a sol-gel-solid phase sintering method. The method comprises the steps of preparation of lithium salt sol, preparation of precursor dispersion liquid, preparation of mixed gel and preparation of the positive electrode material. The lithium salt sol serves as the most direct lithium source and forms the composite sol-gel with the low-cobalt or ternary precursor, the problem of local difference of powder mixing is solved, permeation mixing from inside to outside is achieved through pores of the low-cobalt or ternary precursor by means of certain flowability of the sol lithium salt, and finally, the low-cobalt ternary positive electrode material with excellent electrochemical performance is obtained by adopting a solid-phase sintering mode. The low-cobalt ternary positive electrode material with a good crystal structure is obtained through the sol-gel-solid phase sintering method, and shows excellent first coulombic efficiency, first gram volume and high cycle stability when being applied to a lithium ion battery.

Description

technical field [0001] The present invention relates to CO1G, and more specifically, the present invention relates to a method for preparing a low-cobalt positive electrode material by a sol-gel-solid phase sintering method. Background technique [0002] Cathode material is the most critical raw material for lithium-ion batteries. Metal cobalt plays an important role in stabilizing the structure of ternary cathode materials. However, due to the limited reserves of metal cobalt in the world and its high price, the cost of cathode materials for lithium-ion batteries has been greatly increased. Raw material cost and application cost. Therefore, reducing the proportion of cobalt content in ternary materials is an important measure to effectively reduce the cost and application of ternary cathode materials. Metal cobalt plays an important role in stabilizing the structure of ternary materials. Generally, the crystal structure is easy to collapse after reducing the cobalt content...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M4/505H01M4/525H01M10/0525
CPCC01G53/50H01M4/505H01M4/525H01M10/0525H01M2004/028C01P2002/72C01P2004/03Y02E60/10
Inventor 陆和杰孙旭王浩梁正李海强李永红卢瑶黄凯吴平
Owner 宁夏汉尧富锂科技有限责任公司
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