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High-voltage and single-crystal ternary positive electrode material and preparation method thereof

A positive electrode material, similar to single crystal technology, applied in the direction of electrical components, battery electrodes, circuits, etc., can solve the problem of poor contact between materials and binders and conductive agents, affecting compaction density and electrochemical performance, and poor electrode processing performance And other problems, to achieve the effect of not easy to break, good processing performance, not easy to absorb water

Inactive Publication Date: 2017-10-24
HENAN KELONG NEW ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the morphology of nickel-cobalt lithium manganate ternary materials on the market is mostly spherical or spherical secondary particles formed by the aggregation of primary grains. g / cm 3 ; The electrode processing performance is poor. When the pole piece is rolled, the secondary particles will break, resulting in poor contact between the material, the binder and the conductive agent, thereby affecting the compaction density and electrochemical performance.

Method used

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  • High-voltage and single-crystal ternary positive electrode material and preparation method thereof
  • High-voltage and single-crystal ternary positive electrode material and preparation method thereof
  • High-voltage and single-crystal ternary positive electrode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Nickel sulfate, cobalt sulfate and manganese sulfate are made into mixed solution according to Ni: Co: Mn molar ratio is 0.5: 0.2: 0.3 mixes evenly, the total molar number of three kinds of transition metal ions of Ni, Co, Mn is 2mol / L, then Add 4mol / L NaOH solution, transition metal ion mixed solution and 4mol / L ammonia water into the reaction vessel at the same time, control the pH value of the reaction system to 11.5, and the reaction temperature to 60°C, and control the reaction time so that the generated Ni 0.5 co 0.2 mn 0.3 (OH) 2 The D50 of the precipitate is 3.5 μm, and the particle size distribution is normal distribution. Then, the obtained precipitate was filtered, washed, and dried at 120° C. for 12 hours. Lithium carbonate and Ni 0.5 co 0.2 mn 0.3 (OH) 2 According to Li / M=1.1(Ni 0.5 co 0.2 mn 0.3 (OH) 2 ) ratio for mixing, while adding lithium carbonate and Ni 0.5 co 0.2 mn 0.3 (OH) 2 The total mass is 0.01% magnesium fluoride. After mixing ...

Embodiment 2

[0025] Ni obtained based on embodiment 1 0.5 co 0.2 mn 0.3 (OH) 2 , LiCO3 and Ni 0.5 co 0.2 mn 0.3 (OH) 2 Mix according to the ratio of Li / M=1.1, add lithium carbonate and Ni at the same time 0.5 co 0.2 mn 0.3 (OH) 2 Magnesium fluoride and boric acid (magnesium fluoride: boric acid=5:8) of gross mass 0.1%, other steps are with embodiment 1, obtain the pure phase LiNi of magnesium fluoride and boric acid doping 0.5 co 0.2 mn 0.3 o 2 Ternary material. The ternary material is used as a matrix and aluminum isopropoxide is used as an aluminum source to wet-coat it so that the final aluminum coating amount is 0.01%. At the same time, an appropriate amount of water is added to ensure that the aluminum isopropoxide is completely hydrolyzed. Sintering at 400°C for 5 hours in an oxygen atmosphere, other steps are the same as in Example 1, and finally a uniformly coated Ni with an Al coating amount of 0.01% is obtained. 0.5 co 0.2 mn 0.3 o 2 Cathode material. The charg...

Embodiment 3

[0027] Ni obtained based on embodiment 1 0.5 co 0.2 mn 0.3 (OH) 2 , LiCO3 and Ni 0.5 co 0.2 mn 0.3 (OH) 2 Mix according to the ratio of Li / M=1.1, add lithium carbonate and Ni at the same time 0.5 co 0.2 mn 0.3 (OH) 2 Total mass 0.5% sodium hexametaphosphate, other steps are with embodiment 1, obtain the pure phase LiNi of sodium hexametaphosphate doping 0.5 co 0.2 mn 0.3 o 2 Ternary material. The ternary material is coated with aluminum stearate as an aluminum source, so that the final coating amount of aluminum is 0.1%. Sintering at 300°C for 5 hours in an oxygen atmosphere, other steps are the same as in Example 1, and finally a uniformly coated Ni with an Al coating amount of 0.1% is obtained. 0.5 co 0.2 mn 0.3 o 2 Cathode material. The charge-discharge test was carried out at a rate of 0.1C (1C capacity 180mAh / g) in the voltage range of 3.0-4.45V. The initial discharge capacity of the material was 185.7mAh / g, and the capacity retention rate after 100 cyc...

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Abstract

The invention discloses a high-voltage and single-crystal ternary positive electrode material and preparation method thereof. The general formula of the material can be expressed with Li<x>Ni<1-m-n>Co<m>Mn<n>O2, wherein x is more than 0.96 but less than 1.12, m is more than 0 but less than 1, n is more than 0 but less than 1, and (m+n) is less than 1. The preparation method comprises the steps of preparing a precursor by taking a nickel salt, a cobalt salt and a manganese salt as raw materials and by employing a co-precipitation method or a chemical synthesis method, mixing the precursor with a lithium source, adding a modifying agent into the mixture after pre-processing, and performing sintering, smashing and sieving after uniform mixing to obtain the high-voltage and single-crystal ternary positive electrode material. The grain size of the prepared high-voltage and single-crystal ternary positive electrode material is 2-15 micrometers, and the compaction density reaches 3.8-3.9g / cm<3>; meanwhile, the surface of the ternary positive electrode material is modified by a wet process to package Al, the material structure is stabilized, and side reaction of the material and an electrolyte is prevented; and according to actual detection, the cycle property, the high-temperature storage performance and the safety performance of the lithium ion battery under high voltages of 4.4V and 4.5V are effectively improved.

Description

technical field [0001] The invention relates to a preparation method of a lithium-ion battery ternary positive electrode material, in particular to a ternary positive electrode material with a similar single crystal structure and a preparation method thereof. Background technique [0002] Lithium-ion secondary batteries have the advantages of high voltage, high capacity, long cycle, low self-discharge rate, good thermal stability, etc., and have been widely used in portable mobile tools, digital products and other fields. In recent years, with the continuous upgrading of electronic products and the rapid development of electric vehicles and hybrid vehicles, higher requirements have been placed on the energy density of batteries. At present, lithium cobalt oxide is widely used as the anode material of lithium batteries in the market, but its limited energy density, low safety and high price limit its further development. In contrast, the capacity advantages, good battery per...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/505H01M4/36
CPCH01M4/36H01M4/505H01M4/525Y02E60/10
Inventor 熊红红程迪田新勇
Owner HENAN KELONG NEW ENERGY CO LTD
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