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A step-by-step composite lithium-rich oxide solid solution material and preparation method thereof

An oxide solid solution and material technology, applied in electrochemical generators, structural parts, electrical components, etc., can solve the problems of poor material cycle performance and limited wide application, achieve high specific capacity, improve cycle performance, and inhibit structural damage. Effect

Active Publication Date: 2021-03-23
TIANJIN B&M SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the structure change of the lithium-rich oxide solid solution material during the cycle, the cycle performance of the material is poor, which limits its wide application.

Method used

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  • A step-by-step composite lithium-rich oxide solid solution material and preparation method thereof
  • A step-by-step composite lithium-rich oxide solid solution material and preparation method thereof
  • A step-by-step composite lithium-rich oxide solid solution material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0033] A step-by-step composite lithium-rich oxide solid solution material and a preparation method thereof, comprising the following steps:

[0034] 1) Lithium nitrate and manganese nitrate were dissolved in deionized water to obtain solution I, wherein the amount of manganese substance was 10mol, and the amount of lithium substance / manganese substance=2:1;

[0035] 2) Add ammonium bicarbonate dropwise to the solution I for 8 hours to obtain a solid-liquid mixture II, wherein the amount of ammonium bicarbonate substance / amount of manganese substance=1.5;

[0036] 3) Spray drying the solid-liquid mixture II at a temperature of 200° C. to obtain material III;

[0037] 4) roasting the material III in an air atmosphere, the roasting temperature is 750° C., and the roasting time is 16 hours to obtain the material IV, the amount of the material IV=the amount of manganese in step 1);

[0038] 5) The material IV was added to deionized water, and the aluminum nitrate solution and the...

Embodiment 1

[0049] Embodiment 1 is modified as follows:

[0050] 11) The material X was added to deionized water, and the aluminum nitrate solution and the ammonium fluoride solution were added dropwise thereto for 4 hours to obtain a solid-liquid mixture XI, wherein the amount of fluorine substance / aluminum substance = 3:1 , the amount of material X substance / aluminum substance=100:0.5;

[0051] 12) Spray drying the material Ⅺ at a temperature of 200° C. to obtain material Ⅻ, which is a ternary layered material coated with aluminum fluoride phosphate;

[0052] The rest of the steps are the same. The final product obtained is a lithium-rich oxide solid solution material coated with aluminum fluoride, and the main molecular formula of the product is 0.5Li 2 MnO 3 0.5LiNi 0.5 co 0.2 mn 0.3 o 2 .

Embodiment 1

[0059] Embodiment 1 is modified as follows:

[0060] 5) Add the material IV into deionized water, add aluminum nitrate solution and ammonium fluoride solution dropwise therein for 6 hours, add diammonium hydrogen phosphate solution dropwise therein for 4 hours, and obtain a solid-liquid mixture V, Wherein the amount of fluorine substance / aluminum substance=3:1, the amount of material IV substance / aluminum substance=100:1, the amount of material IV substance / phosphate root substance=100:1;

[0061] 6) Spray-dry the solid-liquid mixture V at a temperature of 260° C. to obtain material VI, which is aluminum fluoride phosphate-coated Li 2 MnO 3 Material;

[0062] 11) Add the material X into deionized water, add diammonium hydrogen phosphate solution dropwise for 4 hours, add aluminum nitrate solution and ammonium fluoride solution dropwise for 6 hours at the same time, and obtain a solid-liquid mixed material Ⅺ, wherein the amount of material X substance / amount of phosphate rad...

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Abstract

The invention discloses a Li-rich oxide solid solution material composited step by step and a preparation method of the Li-rich oxide solid solution material. The method comprises the following steps:firstly, a pure-phase Li2MnO3 material is prepared from soluble Li salt, Mn salt and precipitant ammonium bicarbonate as raw materials with a coprecipitation method and a high-temperature roasting process, and surface is uniformly covered with aluminum fluoride through a liquid phase reaction; then, a pure-phase Ni-Co-Mn ternary stratified material is prepared from soluble Li salt, Ni salt, Mn salt , Co salt and the precipitant ammonium bicarbonate as raw materials with the coprecipitation method and the high-temperature roasting process, and surface is uniformly covered with phosphate through a liquid phase reaction; finally, the Li2MnO3 material and the Ni-Co-Mn ternary stratified material are mixed at a high speed and subjected to high-temperature aftertreatment, and the double-coveredeutectic Li-rich oxide solid solution material is obtained. With adoption of the preparation process of step-by-step compositing, the Li2MnO3 material and the Ni-Co-Mn ternary stratified material aremixed uniformly and grow eutectically, high specific capacity of the Li-rich oxide solid solution material is guaranteed, structural failure of the material is inhibited effectively, and cycle performance of the material is improved.

Description

technical field [0001] The invention relates to the field of cathode materials for lithium-ion secondary batteries, in particular to a step-by-step composite lithium-rich oxide solid solution material and a preparation method thereof. Background technique [0002] The key to the popularization and application of new energy vehicles is to realize that their economy and convenience of use are equivalent to those of traditional fuel vehicles. At present, there is a big gap between new energy vehicles and traditional fuel vehicles. Improving economy and convenience is the main direction for the development of new energy vehicles for a long period of time in the future. [0003] The power battery is the core part of new energy vehicles. Lithium-ion batteries have obvious advantages in terms of cost and energy density, which will greatly improve the economy and convenience of use of new energy vehicles. The positive electrode material in the lithium-ion battery system is decisive....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M10/0525
CPCH01M4/362H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 宋英杰徐宁伏萍萍马倩倩
Owner TIANJIN B&M SCI & TECH
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