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Preparation method of ternary compound potassium ion battery plus plate material

A technology for lithium ion batteries and positive electrode materials, which is applied in the field of preparation of positive electrode materials for ternary composite lithium ion batteries, can solve the problems of difficulty in uniform distribution of three transition metals, the expected effect of doping, and the inability to achieve, so as to shorten the high temperature The effect of sintering time, prolonging settling time and reducing preparation cost

Active Publication Date: 2009-01-14
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, through the simple mixing of transition metal compounds, it is difficult to make the three transition metals evenly distributed, and the expected effect of doping cannot be achieved.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Weigh nickel, manganese, and cobalt according to the ratio of 1:1:1, and take three kinds of nickel nitrate, manganese nitrate, and cobalt nitrate with a total atomic mass of 3 moles to prepare a solution with a concentration of 3 mol / L, and weigh the total The quality is that 5 moles of sodium hydroxide are made into a solution with a concentration of 2 mol / L. After the solution is cooled, a certain amount of ammoniacal liquor is added (the amount of ammoniacal liquor can be determined according to the ratio behind), and the mol ratio of ammonia to sodium hydroxide is 3: 10.

[0026] Add 5 cm deep ammonia solution into the reactor, open the compressed air valve, and control the stirring intensity through the gas flow meter. When the ammonia solution in the reactor is stirred evenly, add the transition metal mixed solution into the reactor with a spray gun, and at the same time turn on the servo pump controlled by the pH meter, and the servo pump pumps ammonia and hydro...

Embodiment 2

[0030] Nickel, manganese, cobalt are weighed nickel nitrate, manganese nitrate, cobalt nitrate by the ratio of 2: 2: 1, are made into the solution that concentration is 3mol / L, all the other conditions are the same as example 1, final product is LiNi 0.4 mn 0.4 co 0.2 o 2 . The specific capacity of the first discharge is 171.2mAh / g, and after 100 cycles of charge and discharge at 1C rate, the capacity retention rate is 93.2%.

Embodiment 3

[0032] Weigh nickel, manganese, and cobalt according to the ratio of 1:1:1, and take three kinds of nickel nitrate, manganese nitrate, and cobalt nitrate with a total atomic mass of 6 moles, and prepare a solution with a concentration of 4 mol / L, and weigh the total mass at the same time. The quality is 9 moles of sodium hydroxide to make a solution with a concentration of 3 mol / L. After the solution is cooled, a certain amount of ammonia (can be determined according to the ratio below) is added. The molar ratio of ammonia to sodium hydroxide is 1:2. All the other conditions are with embodiment 1, form Ni 1 / 3 mn 1 / 3 co 1 / 3 (OH) 2 Precursor; weigh 200 grams of LiOH·H 2 O (lithium hydroxide monohydrate), dissolved in LiOH·H 2 O three times deionized water, add the dried precursor according to the ratio of lithium / (nickel+manganese+cobalt)=1.05, and slowly evaporate the solvent under stirring conditions. The mixture is sintered at high temperature, the sintering atmosphere i...

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Abstract

A method for preparing positive electrode material of ternary composite Li ion cell includes mixing soluble compound of Ni and Mn as well as Co to be transition metal soluble, filling certain amount of ammonia water in reactor then adding transition metal solution into reactor by ejecting gun and pumping mixed liquid of ammonia and sodium hydroxide into reactor by precipitation then wet-mixing it with Li compound, sintering mixture of presoma and Li compound with high temperature under oxygen atmosphere then grinding sintered material to obtain positive electrode material.

Description

technical field [0001] The invention relates to a lithium ion battery, in particular to a method for preparing a positive electrode material of a ternary composite lithium ion battery which is easy to oxidize transition metals, has short high-temperature sintering time and low preparation cost. Background technique [0002] Lithium-ion batteries are widely used in many fields such as portable electronic devices and electric vehicles because of their high energy, long service life, and low pollution. The positive electrode material occupies the most important position in the lithium-ion battery structure, and its performance directly determines the performance of the final secondary battery product, and its performance and price will directly affect the performance and price of the lithium-ion battery. [0003] With the rapid popularization of portable electronic devices, the requirements for battery performance are getting higher and higher, and at the same time, the perform...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/04H01M4/58H01M4/48C01D15/00C01G1/02C01G53/00C01G45/00C01G51/00
CPCY02E60/12Y02E60/10
Inventor 肖峰曹文玉
Owner BYD CO LTD
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