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Lithium-ion battery positive electrode material with self-encapsulated double-modified structure in doping process and preparation method thereof

A technology for lithium-ion batteries and positive electrode materials, which can be applied to battery electrodes, structural parts, secondary batteries, etc., and can solve problems such as the limitation of improving lithium-ion transport characteristics

Active Publication Date: 2020-06-26
HENAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the previous research, our research group proposed a one-step annealing method to achieve self-doping of the surface area of ​​the positive active material body during the coating process, thereby preparing a positive active material structure with a pinning effect, which can effectively strengthen the coating. The stability of the coating structure on the surface of the positive electrode active material can improve the stability and durability of the surface structure of the positive electrode active material in the electrochemical cycle, but it has a positive effect on the improvement of the overall lithium ion transport characteristics of the positive electrode active material body in the electrochemical cycle. Certain limitations

Method used

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  • Lithium-ion battery positive electrode material with self-encapsulated double-modified structure in doping process and preparation method thereof
  • Lithium-ion battery positive electrode material with self-encapsulated double-modified structure in doping process and preparation method thereof
  • Lithium-ion battery positive electrode material with self-encapsulated double-modified structure in doping process and preparation method thereof

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Effect test

Embodiment 1

[0028] A self-encapsulated double-modified lithium-ion battery cathode active material in a doping process, the steps are as follows:

[0029] The body of the modified lithium-ion battery cathode active material is LiCoO 2 , then the positive electrode active material after self-encapsulation double modification in the doping process can be written as Li α co β m γ o δ @Li x co y m z o 2 , where 0≤α2 Different coatings such as LiYO will be formed at different annealing temperatures 2 or Y 2 o 3 . Specifically, when the annealing temperature is set higher than 900 °C, the surface LiYO can be obtained 2 Coated and bulk Y-doped double-modified LiCoO 2 Cathode active material, named as Li 0.005 Y 0.005 o 0.01 @Li 0.995 co 0.99 Y 0.01 o 2 , an annealing temperature set below 900 °C will form a surface Y 2 o 3 Coated and bulk Y-doped double-modified LiCoO 2 Positive active material, named as Y 0.005 o 0.0075 @LiCo 0.99 Y 0.01 o 2 .

[0030] Preparation of...

Embodiment 2

[0032] Preparation of surface-coated LiYO 2 and bulk Y-doped double-modified LiCoO 2 Cathode active material Li 0.005 Y 0.005 o 0.01 @Li 0.995 co 0.99 Y 0.01 o 2 , the specific implementation steps are as follows: take a certain amount of lithium nitrate, cobalt nitrate, yttrium nitrate and citric acid according to the molar ratio of 1.2:0.985:0.015:3.15, dissolve them in ultrapure water respectively, then mix well, and mix the solution in Stir continuously at 80 °C for 10 h to form a sol, and then dry it in a drying oven at 120 °C for 12 h. After the obtained dry gel is ground evenly, it is pre-fired in a muffle furnace at 600 °C for 24 h, cooled and taken out, and fully ground evenly. Then, it was annealed at 900 °C for 24 h in the air atmosphere, and cooled naturally to room temperature to obtain the self-coated double-modified positive electrode active material Li during the doping process. 0.005 Y 0.005 o 0.01 @Li 0.995 co 0.99 Y 0.01 o 2 .

Embodiment 3

[0034] One-step preparation of doped-coated integrated La by high-temperature solid-state method 0.195 co 0.0195 o 0.0585 @LiCo 0.995 La 0.005 o 2 Cathode material. Weigh a certain mass of lithium carbonate, cobalt tetroxide and lanthanum nitrate according to the stoichiometric ratio of 1:0.8:0.2, mix and mill in a ball mill, calcinate at 1100 °C for 4 hours, take out after natural cooling, wash, dry, and grind to obtain the double-modified modification. La after sex 0.195 co 0.0195 o 0.0585 @LiCo 0.995 La 0.005 o 2 Cathode material.

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Abstract

The invention provides a self-coated and dual-modification structure lithium ion battery positive electrode material during doping process and a preparation method thereof. In the preparation processof a dual-modification structure of a self-coated positive active material during the doping process, body phase doping is firstly performed, and a coating shell layer is further formed on a surface of the positive active material with body phase doping by a doping material after body phase doping of the positive active material. By further combining body phase doping and surface coating on modification means of the positive active material, dual modification effects of metal element body phase doping and corresponding element compound surface coating of the positive active material body are achieved, a body phase structure and a surface structure of the positive active material of the lithium ion battery are stabilized from inside to outside, the compatibility of an internal body structure and a surface protection structure is compatible, so that the integral dynamic behavior of ion transmission and diffusion of the lithium ion battery positive active material during the electrochemical circulation process is improved.

Description

technical field [0001] The invention relates to the design, preparation, modification and application fields of lithium-ion battery positive electrode materials, in particular to a lithium-ion battery positive electrode material with a self-encapsulating double-modification structure in the doping process and a preparation method thereof. Background technique [0002] The positive electrode active material of lithium-ion battery determines the performance and price of the battery to a large extent. In order to improve the utilization rate of resources, the design and modification of cathode active materials is one of the main contents in the research field of lithium-ion batteries. Among them, doping and coating are two methods for effectively modifying the existing cathode active materials. . At present, in doping modification, doping ions with a radius similar to that of the metal cations contained in the positive active material are mostly used to replace the metal ions ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/48H01M10/0525
CPCY02E60/10
Inventor 白莹张晨郁彩艳赵慧玲
Owner HENAN UNIVERSITY
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