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Composite coated positive pole material of lithium ionic cell and preparing method thereof

A composite positive electrode material and lithium-ion battery technology, applied in the direction of electrode manufacturing, battery electrodes, chemical instruments and methods, etc., can solve problems such as gelling, gas swelling, explosion, etc., and achieve simple process, low cost, and controllable procedures Effect

Active Publication Date: 2011-02-02
BTR NEW MATERIAL GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The prepared ternary cathode material has a high specific capacity, 150-215mAh / g, and the currently commonly used LiCoO 2 The actual capacity of the positive electrode material is only 130-140mAh / g, but this kind of pure ternary material will have safety problems such as gelling, gas swelling, and explosion during the application process, which limits its large-scale industrialization to a certain extent application
The cycle performance, energy density and charging capacity of this type of material can not meet the needs

Method used

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  • Composite coated positive pole material of lithium ionic cell and preparing method thereof
  • Composite coated positive pole material of lithium ionic cell and preparing method thereof
  • Composite coated positive pole material of lithium ionic cell and preparing method thereof

Examples

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preparation example Construction

[0024] The preparation method of lithium-ion battery composite coating cathode material of the present invention comprises the following steps:

[0025] 1. Prepare lithium hydroxide or sodium hydroxide alkali solution with a concentration of 0.5-8 mol / L, and chloride, sulfate or nitrate solutions of nickel, cobalt and manganese with a concentration of 0.5-8 mol / L, in which nickel, cobalt and manganese The molar ratio of salt is 7~9:1~5:1~5, and accounts for the whole solution, the additive of 0~10wt% in the final solution, and additive is ammoniacal liquor, ethylene glycol, ethylenediamine, 12~16 One or both of sodium alkyl sulfonate and polyethylene glycol are added to the reaction kettle at a flow rate of 10-100L / h at the same time, and the pH of the solution is adjusted to 8-11.0 by controlling the dropping rate of the alkali solution, and carried out Stir continuously to make it generate a uniform precipitated powder, which is Ni 0.7 co 0.2 mn 0.1 (OH) 2 、Ni 0.8 co 0...

Embodiment 1

[0032] Embodiment 1, one, prepare the sodium hydroxide alkaline solution of 1mol / L concentration earlier, preparation 1mol / L mol ratio is the nickel nitrate, cobalt nitrate, manganese nitrate solution of 8: 1: 1, preparation concentration is whole solution quality simultaneously A mixed solution of 10wt% ammonia water and ethylene glycol, each prepared solution is added to the reaction kettle at a flow rate of 60L / h at the same time, and continuously stirred to form a uniform precipitate, and the pH of the solution is adjusted by controlling the dropping speed of the alkali solution The value is at 10.8. Filter and wash the precipitated powder in a vacuum filter, measure the pH value of the filtrate to be around 5, and titrate the filtrate with barium nitrate. When there is no obvious precipitation, the filtration ends; Dry the powder at 80°C for 12 hours in a vacuum oven.

[0033] 2. Mix the dried powder with lithium hydroxide at a ratio of 1:1.05 in a powerful disperser (pl...

Embodiment 2

[0040] Embodiment 2, one, prepare the lithium hydroxide alkali solution of 0.5mol / L concentration earlier, the preparation 0.5mol / L molar ratio is the nickel nitrate, cobalt nitrate, manganese nitrate solution of 8: 1: 1, preparation concentration is the whole A mixed solution of ammonia water and ethylenediamine with a solution quality of 0.5wt%, each prepared solution is simultaneously added to the reaction kettle at a flow rate of 10L / h, and continuously stirred to form a uniform precipitate, which is obtained by controlling the dripping rate of the alkali solution. Adjust the pH of the solution to 8.0. Filter and wash the precipitated powder in a vacuum filter, measure the pH value of the filtrate to be around 5, and titrate the filtrate with barium nitrate. When there is no obvious precipitation, the filtration ends; Dry the powder at 120°C for 12 hours in an infrared drying oven.

[0041] 2. Mix the dried powder with lithium hydroxide at a ratio of 1:0.8 in a barrel bal...

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Abstract

The invention discloses a coated composite lithium ion battery anode material and the preparation method thereof, aiming at improving the electrochemical property of the coated composite lithium ion battery anode material. The invention takes Li0.8-1.2Ni0.7Co0.2Mn0.1O2, and Li-0.8-1.2Ni0.8Co0.1Mn0.1O2, or Li0.8-1.2Ni0.9Co0.05Mn0.05O2 as the substrate, and adopts hexagonal crystal structure; the surface of the substrate is coated with a functionally gradient material layer which is 1-20%of the quality of the substrate. The preparation method includes the steps of preparing powder, mixing the materials, sintering, coating the surface, heating, and coating with organic material coating. Compared with prior art, the anode material can be combined with lithium metal and assembled to an analog battery; if the battery is charged or discharged at current density of 0.3C under 2.5-4.2V, the discharge capacity is more than 190mAh / g, the first coulomb efficiency will reach 90% and the capacity retention is more than 95% after 100 cycles. The coated composite lithium ion battery anode material is simple in technique and low in cost and is suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to a lithium ion battery positive electrode material and a preparation method thereof, in particular to a lithium ion battery composite coated positive electrode material and a preparation method thereof. Background technique [0002] Lithium-ion secondary batteries have the advantages of high energy density, long cycle life and low self-discharge rate. Since Sony successfully realized the commercial production of lithium-ion secondary batteries in 1990, lithium-ion batteries have been widely used in various portable In terms of electronic products and mobile tools, it also has great application prospects in electric vehicle EV and hybrid electric vehicle HEV power supply. The cathode material currently studied is mainly LiCoO with a layered structure. 2 , LiNiO 2 , LiMnO 2 , LiMn with spinel structure 2 o 4 and forsterite-structured phosphate series. LiCoO 2 Due to relatively high cost and relatively low capacity, the theo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/48H01M4/62H01M4/58H01M4/60H01M4/04B01J19/00
CPCY02E60/10
Inventor 岳敏李斌张万红贺雪琴梅佳程林
Owner BTR NEW MATERIAL GRP CO LTD
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