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, explosion, and gas swelling, and achieve simple process, controllable procedure, and low cost Effect

Active Publication Date: 2008-11-19
BTR NEW MATERIAL GRP CO LTD
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  • 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

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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Example Embodiment

[0024] The method for preparing composite coated positive electrode material for lithium ion battery of the present invention includes the following steps:

[0025] 1. Prepare a lithium hydroxide or sodium hydroxide alkaline solution with a concentration of 0.5-8mol / L, and a chloride, sulfate or nitrate solution of nickel, cobalt and manganese with a concentration of 0.5-8mol / L, including nickel, cobalt, and manganese. The molar ratio of the salt is 7-9:1-5:1-5, and the total solution is 0-10wt% of the additives in the final solution. The additives are ammonia, ethylene glycol, ethylenediamine, twelve to sixteen. One or two of sodium alkyl sulfonate and polyethylene glycol are simultaneously added to the reaction kettle at a flow rate of 10 to 100 L / h, and the pH of the solution is adjusted to 8 to 11.0 by controlling the dropping rate of the alkali solution. Continuous stirring to produce uniform precipitation powder, which is Ni 0.7 Co 0.2 Mn 0.1 (OH) 2 , Ni 0.8 Co 0.1 Mn 0.1 (O...

Example Embodiment

[0032] Example 1. First, prepare a sodium hydroxide alkali solution with a concentration of 1 mol / L, and prepare a solution of nickel nitrate, cobalt nitrate and manganese nitrate with a molar ratio of 1 mol / L of 8:1:1. At the same time, the concentration is the entire solution mass. A mixed solution of 10wt% ammonia and ethylene glycol is added to the reactor at the same time at a flow rate of 60L / h, and continuous stirring is performed to form a uniform precipitate. The pH of the solution is adjusted by controlling the rate of dropping of the alkali solution. The value is 10.8. The precipitated powder is filtered and washed in a vacuum suction filter, the pH of the filtrate is measured to be around 5, and the filtrate is titrated with barium nitrate, and the filtration is completed when there is no obvious precipitation; then the washed precipitate is Dry the powder at 80℃ for 12h in a vacuum drying oven,

[0033] 2. Mix the dried powder with lithium hydroxide in a powerful disp...

Example Embodiment

[0041] Example 2: 1. First prepare a 0.5mol / L lithium hydroxide alkali solution, prepare a 0.5mol / L nickel nitrate, cobalt nitrate, and manganese nitrate solution with a molar ratio of 8:1:1, and at the same time prepare the concentration as the whole The mixed solution of ammonia water and ethylenediamine of 0.5wt% of the solution mass is added to the reactor at the same time at a flow rate of 10L / h, and continuous stirring is carried out to form a uniform precipitate. The rate of dropping of the alkali solution is controlled. Adjust the pH of the solution to 8.0. The precipitated powder is filtered and washed in a vacuum suction filter, the pH of the filtrate is measured to be around 5, and the filtrate is titrated with barium nitrate, and the filtration is completed when there is no obvious precipitation; then the washed precipitate is In an infrared drying oven, the powder is dried at 120°C for 12 hours.

[0042] 2. Mix the dried powder with lithium hydroxide at a ratio of 1:0...

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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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IPC IPC(8): H01M4/58H01M4/48H01M4/60H01M4/62H01M4/04B01J19/00
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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