Ternary positive electrode material with special single-crystal structure, and preparation method thereof

A single crystal structure, positive electrode material technology, applied in the direction of structural parts, electrical components, battery electrodes, etc., can solve the problems of secondary balls being easily broken and low compaction, so as to achieve not easy to break, reduce polarization loss, improve The effect of battery energy

Active Publication Date: 2014-06-04
SHANDONG GOLDENCELL ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the ternary materials on the market are mainly ternary materials with secondary spherical particles. The material has low compaction, and the secondary balls are easily broken during the production process.

Method used

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  • Ternary positive electrode material with special single-crystal structure, and preparation method thereof
  • Ternary positive electrode material with special single-crystal structure, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The single crystal structure ternary cathode material LiNi was prepared according to the following steps 0.25 co 0.25 mn 0.5 f 0.01 o 2

[0022] 1) Accurately weigh 200 grams of nickel sulfate, cobalt sulfate, and manganese sulfate according to the molar ratio of Ni:Co:Mn=1:1:2, dissolve them in a certain amount of water, prepare the solution, and then slowly add ammonia water dropwise into the solution, When the pH is 9, pour the solution into the reaction kettle, put the reaction kettle into a muffle furnace for sintering at 385°C for 17 hours, cool, wash, dry and grind to obtain a single crystal structure precursor, that is, nickel cobalt manganese oxide.

[0023] 2) According to the molar ratio of Li to the sum of nickel, cobalt, and manganese of 1.01:1, weigh lithium carbonate, and the ratio of F to the sum of nickel, cobalt, and manganese is 0.01:1 to weigh lithium fluoride, and lithium carbonate, Mix nickel-cobalt-manganese oxide and lithium fluoride evenly,...

Embodiment 2

[0026] The single crystal structure ternary cathode material LiNi was prepared according to the following steps 0.25 co 0.25 mn 0.5 Cr 0.02 o 2

[0027] 1) Accurately weigh 200 grams of nickel nitrate, cobalt nitrate, and manganese nitrate according to the molar ratio of Ni:Co:Mn=1:1:2, dissolve them in a certain amount of water, prepare the solution, and then slowly add ammonia water dropwise into the solution, When the pH is 9, pour the solution into the reaction kettle, put the reaction kettle into a muffle furnace for sintering at 420°C for 15 hours, cool, wash, dry, and grind to obtain a single crystal structure precursor, that is, nickel cobalt manganese oxide.

[0028] 2) According to the molar ratio of Li to the sum of nickel, cobalt, and manganese of 1.02:1, weigh lithium carbonate, and the ratio of Cr to the sum of nickel, cobalt, and manganese is 0.02:1 to weigh lithium fluoride, and lithium carbonate, Nickel-cobalt-manganese oxide and chromium nitrate are even...

Embodiment 3

[0031] The single crystal structure ternary cathode material LiNi was prepared according to the following steps 0.25 co 0.25 mn 0.5 Ti 0.02 o 2

[0032] 1) According to the molar ratio of Ni:Co:Mn=1:1:2, accurately weigh 200 grams of nickel chloride, cobalt chloride, and manganese chloride and dissolve them in a certain amount of water to prepare the solution, and then slowly add ammonia water dropwise to solution, until the pH is 9, pour the solution into a reaction kettle, put the reaction kettle into a muffle furnace for sintering at 350°C for 17 hours, cool, wash, dry, and grind to obtain a single crystal structure precursor, namely nickel cobalt manganese oxide.

[0033] 2) According to the molar ratio of Li to the sum of nickel, cobalt, and manganese of 1.02:1, weigh lithium hydroxide, and the ratio of Cr to the sum of nickel, cobalt, and manganese is 0.02:1 to weigh lithium fluoride, and lithium carbonate , nickel-cobalt-manganese oxide and chromium nitrate are ev...

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Abstract

The invention relates to a preparation method for a ternary positive electrode material with a special single-crystal structure. A general formula of the positive electrode material is LiNixCoyMnzMvO2, wherein a sum of x, y and z is 1, x is equal to or larger than 0.2 but smaller than or equal to 0.6; y is equal to or larger than 0.1 but smaller than or equal to 0.4; z is equal to or larger than 0.2 but smaller than or equal to 0.5; v is equal to or larger than 0.01 but smaller than or equal to 0.03; and M is one of Ti, Zn, Cr and F. The preparation method for the ternary positive electrode material with the special single-crystal structure comprises two steps of 1. preparing a precursor-cobalt nickel manganese oxide with the single-crystal structure; and 2. preparing a cobalt nickel manganese ternary material with the single-crystal structure.

Description

technical field [0001] The invention relates to a lithium ion battery cathode material and a preparation method thereof, in particular to a ternary cathode material with a special single crystal structure and a preparation method thereof. Background technique [0002] Lithium-ion secondary batteries are becoming more and more important in people's lives, and have been widely used as a source of portable power. Compared with other power sources, it has many advantages, such as long service life, light weight, low cost and environmental friendliness. Therefore, lithium batteries continue to grow in domestic and foreign markets. [0003] Early commercial lithium-ion battery cathode materials mainly focused on LiCoO 2 , and its capacity is only 140mAh / g, which is mainly because the chemical properties and structure of the material are unstable under high voltage conditions, and cobalt is expensive and toxic. At present, in addition to lithium cobalt oxide, commercialized posi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525
CPCY02E60/122H01M4/505H01M4/525Y02E60/10
Inventor 关成善宗继月李涛杜丽丽贾传龙
Owner SHANDONG GOLDENCELL ELECTRONICS TECH
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