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Lithium ion battery lithium-enriched cathode material, and improving method thereof

A lithium-rich positive electrode material, lithium-ion battery technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of large irreversible capacity loss, low initial energy utilization rate, poor rate performance, etc., to achieve the suppression of interface side reactions, Effects of improving rate performance and cycle performance and maintaining stability

Inactive Publication Date: 2018-03-23
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this type of material has the problems of low initial energy utilization rate, large irreversible capacity loss, and poor rate performance at high current density.

Method used

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  • Lithium ion battery lithium-enriched cathode material, and improving method thereof
  • Lithium ion battery lithium-enriched cathode material, and improving method thereof
  • Lithium ion battery lithium-enriched cathode material, and improving method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1 A kind of lithium-ion battery lithium-rich cathode material is Li[Li 0.2 Ni 0.15 mn 0.55 co 0.1 ]O 2 , including the following steps:

[0026] (1) Mixing: Weigh analytically pure CH according to the stoichiometric ratio (1.26:0.15:0.55:0.1) 3 COOLi·2H 2 O, Ni(CH 3 COO) 2 4H 2 O, Mn(CH 3 COO)·4H 2 O, Co(CH 3 COO) 2 4H 2 O, be dissolved in deionized water respectively, gradually add dropwise citric acid solution, the addition of citric acid solution is equal to the sum of the molar weights of transition metal ions, and the pH value of the mixed solution is adjusted to about 7 with strong ammonia water;

[0027] (2) Heating: heat and stir the mixed solution system obtained in step (1) in a water bath at 80° C. to evaporate water, and gradually obtain a gel;

[0028] (3) Drying: drying the gel body obtained in step (2) in a blast drying oven at 120°C for 24 hours to obtain a xerogel;

[0029] (4) Precursor preparation: pre-calcining the dried gel...

Embodiment 2

[0031] Example 2 A surface coated with 3wt% LiCoO 2 Lithium-rich cathode materials for lithium-ion batteries Li[Li 0.2 Ni 0.15 mn 0.55 co 0.1 ]O 2 , including the following steps:

[0032] With the Li[Li prepared by embodiment 1 0.2 Ni 0.15 mn 0.55 co 0.1 ]O 2 The positive electrode material and mass fraction ratio are 3wt% LiCoO 2 Disperse into an ethanol solution with 11 times the mass, heat and stir at 40°C until the solvent is basically volatilized, dry at 80°C for 24 hours, and finally calcinate at 450°C for 6 hours to obtain the final product surface coated with 3wt% LiCoO 2 Li[Li 0.2 Ni 0.15 mn 0.55 co 0.1 ]O 2 .

Embodiment 3

[0033] Embodiment 3 A kind of surface coating 3wt% LiMn 2 o 4 Lithium-rich cathode materials for lithium-ion batteries Li[Li 0.2 Ni 0.15 mn 0.55 co 0.1 ]O 2 , including the following steps:

[0034] The prepared Li[Li 0.2 Ni 0.15 mn 0.55 co 0.1 ]O 2 The positive electrode material and mass fraction ratio are 3wt% LiMn 2 o 4 Disperse into ethanol solution with 7 times the mass, heat and stir at 40°C until the solvent is basically volatilized, dry at 80°C for 24 hours, and finally calcinate at 450°C for 6 hours to obtain the final product surface coated with 3wt% LiMn 2 o 4 Li[Li 0.2 Ni 0.15 mn 0.55 co 0.1 ]O 2 .

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Abstract

The invention relates to a lithium ion battery lithium-enriched cathode material, and an improving method thereof, and belongs to the technical field of lithium ion batteries cathode material. The lithium ion battery lithium-enriched cathode material comprises a cathode material, and three commercial lithium ion cathode clad materials including LiCoO2, LiMn2O4, or LiFePO4. According to a preparation method, sol-gel method and water batch stirring heating are adopted so as to obtain a gel; drying is adopted so as to obtain a dried gel; low temperature presintering and high temperature sinteringare adopted respectively, and cooling and grinding are adopted so as to obtain the cathode material; the obtained cathode material and LiCoO2 and LiMn2O4 clad materials are dispersed in deionized water, constant temperature stirring, standing, filtering, washing, drying, and sintering are adopted so as to obtain the lithium ion battery lithium-enriched cathode material; liquid phase cladding is adopted for LiFePO4, the cathode material is dispersed in an aluminum nitrate enneahydrate solution, constant temperature stirring, standing, filtering, washing, drying, and sintering are adopted so asto obtain the needed modified material. The preparation method is simple; operation is convenient; the obtained lithium ion battery lithium-enriched cathode material is uniform in particle size distribution, high in degree of crystallization; the rate capability and the circulating performance of the obtained material after cladding are improved obviously.

Description

technical field [0001] The invention relates to a lithium-rich cathode material for a lithium-ion battery and an improvement method thereof, belonging to the technical field of cathode materials for lithium-ion batteries. Background technique [0002] As a green secondary battery, lithium-ion batteries are widely used in various digital electronic products and communication equipment due to their high specific capacity, high power density, and long cycle life. With the continuous popularization and expansion of its application, lithium-ion batteries have gradually emerged in the market of large-capacity batteries such as electric vehicles, and have attracted much attention. As far as the current development process of lithium-ion batteries is concerned, compared with the rapidly developing negative electrode materials and electrolytes of lithium-ion batteries, the development of positive electrode materials is relatively slow; and in terms of its large-scale promotion, posit...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525
CPCH01M4/362H01M4/505H01M4/525Y02E60/10
Inventor 张海朗
Owner JIANGNAN UNIV
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