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A kind of in-situ precipitated oxide-coated positive electrode material for lithium-ion batteries and its preparation method and application

A technology for lithium-ion batteries and cathode materials, applied in battery electrodes, batteries, secondary batteries, etc., can solve the problems of matrix material particle agglomeration, serious, inability to achieve coating, etc., to suppress structural changes, improve Coulomb efficiency, and easily effect of operation

Active Publication Date: 2019-12-27
杭州烯谷科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this coating method cannot achieve uniform, complete and tight coating of the base material
Since the manganese oxide matrix material synthesized in the first step needs to be heat-treated under high temperature conditions, the obtained matrix material particles are more agglomerated, so this mechanical mixing method cannot achieve complete coating of each particle
In addition, this ectopic coating method cannot achieve a tight bond between the coating material and the base material
Due to the above reasons, this coating method has limited effect on improving the electrochemical performance of layered oxide cathode materials.

Method used

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  • A kind of in-situ precipitated oxide-coated positive electrode material for lithium-ion batteries and its preparation method and application
  • A kind of in-situ precipitated oxide-coated positive electrode material for lithium-ion batteries and its preparation method and application
  • A kind of in-situ precipitated oxide-coated positive electrode material for lithium-ion batteries and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] In situ Precipitation of Er Synthesized by Spray Pyrolysis 2 o 3 Cover 0.5Li 2 MnO 3 -0.5LiNi 0.33 co 0.33 mn 0.33 o 2 (LNCMO@Er 2 o 3 ) Cathode material

[0050] In situ precipitation of Er 2 o 3 Cover 0.5Li 2 MnO 3 -0.5LiNi 0.33 co 0.33 mn 0.33 o 2 (LNCMO@Er 2 o 3 ) Preparation of positive electrode material: Li, Ni, Co, Mn acetate are added to a certain amount of deionized water according to the stoichiometric ratio, and mechanical stirring is used to obtain a uniform reaction solution; then 10% (Er 2 o 3 , 10 wt%) adding erbium acetate (ErAC) into the reaction solution; performing spray pyrolysis on the reaction solution to obtain a precursor. The resulting precursors were heat-treated at 900 °C for 10 hours to obtain different Er 2 o 3 Coated LNCMO cathode material.

[0051] Will LNCMO@Er 2 o 3 The positive electrode material and the binder are mixed in a certain proportion, and magnetically stirred for 4 hours to obtain a uniform slurry, a...

Embodiment 2

[0058] In situ Precipitation of Er Synthesized by Spray Pyrolysis 2 o 3 Cover 0.5Li 2 MnO 3 -0.5LiNi 0.33 co 0.33 mn 0.33 o 2 (LNCMO@Er 2 o 3 ) Cathode material—the influence of different erbium raw materials

[0059] In situ precipitation of Er 2 o 3 Cover 0.5Li 2 MnO 3 -0.5LiNi 0.33 co 0.33 mn 0.33 o 2 (LNCMO@Er 2 o 3 ) Preparation of positive electrode material: Li, Ni, Co, Mn acetate are added to a certain amount of deionized water according to the stoichiometric ratio, and mechanical stirring is used to obtain a uniform reaction solution; then 10% (Er 2 o 3 , 10wt%) different kinds of erbium salt raw materials (erbium nitrate, erbium carbonate, erbium oxalate) were added to the reaction solution; the reaction solution was sprayed and pyrolyzed to obtain the precursor. The resulting precursors were heat-treated at 900 °C for 10 hours to obtain different Er 2 o 3 Coated LNCMO cathode material.

[0060] The preparation of the electrode and the assembly...

Embodiment 3

[0063] Co-precipitation method to prepare LNCMO@Er 2 o 3 Cathode material

[0064] In situ precipitation of Er 2 o 3 Cover 0.5Li 2 MnO 3 -0.5LiNi 0.33 co 0.33 mn 0.33 o 2 (LNCMO@Er 2 o 3 ) Preparation of positive electrode material: by stoichiometric ratio Li, Ni, Co, Mn nitrate are added to a certain amount of deionized water, then by coating amount mass percentage 10% (Er 2 o 3 , 10 wt%) adding erbium nitrate to the reaction solution, using ammonia water to adjust the pH of the solution to 11, mechanically stirring for 10 hours, then using suction filtration to obtain the reactant, drying at 120 degrees Celsius for 12 hours to obtain the precursor. The resulting precursors were heat-treated at 900 °C for 10 hours to obtain different Er 2 o 3 Coated LNCMO cathode material.

[0065] The preparation of the electrode and the assembly of the battery are the same as in Example 1.

[0066] Figure 6 For original LNCMO and mass percent 10% Er 2 o 3 XRD of coated L...

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Abstract

The invention relates to the field of lithium ion battery positive electrode materials, and particularly to a preparation method for a novel in-situ precipitating oxide-coated lithium ion battery positive electrode material. The preparation method for the novel in-situ precipitating oxide-coated lithium ion battery positive electrode material comprises the following steps of: adding a raw material of a cladding material in a preparation process of a precursor of an oxide positive electrode material; and then during a high temperature heat treatment, enabling the cladding material to be subjected to oxygenolysis and in-situ precipitation on a substrate surface of the oxide positive electrode material, so that cladding modification can be carried out on the substrate surface of the oxide positive electrode material, thus obtaining an oxide-coated oxide composite positive electrode material. According to the in-situ precipitating oxide-coated modified lithium ion battery positive electrode material, a first charge and discharge capacity can reach up to 295mAh / g; and after 300 times of circulation, the capacity retention ratio can reach 100%. The modified lithium ion battery positive electrode material has the advantages of excellent electrochemical performance and broad application prospects.

Description

technical field [0001] The invention relates to the field of lithium-ion battery cathode materials, in particular to a preparation method for in-situ precipitation of oxide-coated lithium-ion battery cathode materials. Background technique [0002] With the development of science and technology and the progress of human society, the problems of energy depletion and environmental pollution have become increasingly prominent. The development of new efficient and clean energy conversion, storage technologies and energy utilization methods has become the key to solving these problems and realizing the sustainable development of human society. Due to its high working potential, high specific energy density, high specific power, high operating temperature range, long cycle life and good environmental friendliness, lithium-ion batteries are widely used in the field of portable mobile electronic equipment, power tools, energy storage devices, electric vehicles and hybrid vehicles ar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/58H01M4/62H01M4/131H01M4/136H01M10/0525
CPCH01M4/131H01M4/136H01M4/366H01M4/505H01M4/525H01M4/5825H01M4/628H01M10/0525H01M2220/10H01M2220/20H01M2220/30Y02E60/10
Inventor 潘洪革张世明高明霞刘永锋
Owner 杭州烯谷科技有限公司
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