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Positive electrode material, preparation method thereof, battery positive electrode, and lithium ion battery

A positive electrode material, battery positive electrode technology, applied in the field of materials, can solve the problems of reducing electronic products, existing safety hazards, automatic shutdown, etc., to achieve the effects of large capacity, simple and convenient operation, and increased specific surface area

Active Publication Date: 2019-08-06
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the DCR of lithium-ion batteries is an indicator that has attracted much attention in recent years. When the DCR of lithium-ion batteries is too large, even if the battery capacity is high, the voltage will drop rapidly and electronic products will automatically shut down. When the temperature is too high, the temperature of the battery will rise too much when the battery is discharged at a large rate, which will pose a safety hazard

Method used

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  • Positive electrode material, preparation method thereof, battery positive electrode, and lithium ion battery
  • Positive electrode material, preparation method thereof, battery positive electrode, and lithium ion battery
  • Positive electrode material, preparation method thereof, battery positive electrode, and lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0093] 0.62g LiOH·H 2 O, 6.67g Gd(NO 3 ) 3 ·6H 2 O and 3.9g (NH 4 ) 2 HPO 4 Dissolve in water, stir to mix, and react to form a white precipitate. After filtering out the precipitated substance, dry it, grind it, sieve it, add 5000g LiCoO 2 , after ball milling in a high-energy ball mill for 24 hours, calcined at 650°C for 3 hours in an air atmosphere; the sintered samples were crushed and sieved to obtain LiGdP with an average particle size of about 4 μm 2 o 7 coated cathode material. For the obtained LiGdP 2 o 7 The coated cathode material was prepared as a full cell and tested for DCR.

Embodiment 2

[0095] The preparation method is consistent with that of Example 1, except that what is obtained in Example 2 is LiGdP with an average particle size of about 10 μm 2 o 7 coated cathode material.

Embodiment 3

[0097] The preparation method is the same as in Example 1, except that what is obtained in Example 3 is LiGdP with an average particle size of about 15 μm 2 o 7 coated cathode material.

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Abstract

The application provides a positive electrode material, a preparation method thereof, a battery positive electrode, and a lithium ion battery. The positive electrode material includes an active material; a coating material coating the active material and comprising at least one of LitAP2O7, wherein 1 <= t <= 2, and A is selected at least one of the group including Gd, V, Co, Fe, Mn, Ba, Sr, Zn, Ti, Mg, Ni, La, Ce, and Cd elements. The inventor discovers that the positive electrode material has a low DCR and the structure of LitAP2O7 contributes to the de-intercalation of Li+, so that the positive electrode material has a good ion guiding ability, good stability, good cycle performance, good first discharge capacity and good use performance.

Description

technical field [0001] The present application relates to the technical field of materials, and specifically, to positive electrode materials and preparation methods thereof, battery positive electrodes and lithium ion batteries. Background technique [0002] In recent years, with the popularization of daily-use portable products such as mobile phones and notebook computers, the demand for lithium-ion batteries has continued to increase. Cathode material is the core key material of lithium-ion batteries, and its performance and quality directly affect the important performances of lithium-ion batteries such as capacity, life, safety, and DC resistance (DCR). Among them, the DCR of lithium-ion batteries is an indicator that has attracted much attention in recent years. When the DCR of lithium-ion batteries is too large, even if the battery capacity is high, the voltage will drop rapidly and electronic products will automatically shut down. When the temperature is too high, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/62H01M4/131H01M10/0525
CPCH01M4/131H01M4/366H01M4/62H01M10/0525H01M2220/30Y02E60/10
Inventor 李涛徐磊敏王巍
Owner NINGDE AMPEREX TECH
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