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Synthetic method for lithium ion cathode material LiNiO2/C

A technology of positive electrode materials and synthesis methods, applied in battery electrodes, electrical components, electrochemical generators, etc., can solve problems such as deterioration of electrochemical performance, poor thermal stability, and decrease in specific capacity, so as to prevent excessive grain production, Improve electrical conductivity and prevent agglomeration

Inactive Publication Date: 2015-11-11
田东
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, currently LiNiO 2 Applications are limited by many unfavorable factors, mainly including: stoichiometric LiNiO 2 Difficult to synthesize, small changes in synthesis conditions can lead to non-stoichiometric LiNiO 2 Production: Non-stoichiometric LiNiO 2 Due to the exchange of atomic positions in lithium and nickel atomic layers, the electrochemical performance deteriorates, and the specific capacity drops significantly; the first cycle has about 20% irreversible capacity; poor thermal stability, intolerance to overshoot, etc.

Method used

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  • Synthetic method for lithium ion cathode material LiNiO2/C

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] According to n(Li):n(Ni)=1.03, weigh 910 lithium acetate and 1000g nickel monoxide, add 100g organic carbon source glucose according to the weight of nickel monoxide 10%, add nickel monoxide and glucose, add 3L anhydrous salt water Mix evenly, ball mill for 8 hours, and spray granulate. The obtained powder is pretreated at 500° C. for 7 hours in an inert atmosphere to obtain carbon-coated nickel monoxide powder. Dissolve lithium acetate in 3.5L of anhydrous salt water, add carbon-coated nickel monoxide powder, stir evenly, ball mill for 3 hours, and spray granulate to obtain a dry powder. Put the powder into a rotary furnace, sinter at 650°C for 8h in N2 atmosphere, then heat up to 800°C for 5h, cool, sieve, classify by air flow and obtain the product.

[0019] The resulting product had a carbon content of 1.2%.

Embodiment 2

[0021] According to n(Li):n(Ni)=1.07, weigh 343g lithium hydroxide and 1000g nickel monoxide, add 150g organic carbon source sucrose according to the weight of nickel monoxide 15%, add nickel monoxide and sucrose 3.5L Mix evenly without salt water, ball mill for 8 hours, and spray granulate. The obtained powder is pretreated at 500° C. for 8 hours in an inert atmosphere to obtain carbon-coated nickel monoxide powder. Dissolve lithium hydroxide in 3.5L of anhydrous salt water, add carbon-coated nickel monoxide powder, stir evenly, ball mill for 3 hours, and spray granulate to obtain dry powder. Put the powder into a rotary furnace, sinter at 600°C for 8h in N2 atmosphere, then heat up to 800°C for 4h, cool, sieve, classify by air flow and obtain the product.

[0022] The resulting product had a carbon content of 1.6%.

Embodiment 3

[0024] According to n(Li):n(Ni)=1.05, weigh 336g of lithium hydroxide and 1000g of nickel monoxide, add 100g of organic carbon source polyethylene glycol according to the weight of 10% of nickel monoxide, and mix nickel monoxide and polyethylene glycol Diol was added and 3.0 L of anhydrous salt water were added, mixed evenly, ball milled for 3 hours, spray granulated, and the obtained powder was pretreated at 500° C. for 8 hours in an inert atmosphere to obtain carbon-coated nickel monoxide powder. Dissolve lithium hydroxide in 3.5L of anhydrous salt water, add carbon-coated nickel monoxide powder, stir evenly, ball mill for 3 hours, and spray granulate to obtain dry powder. Put the powder into a rotary furnace, sinter at 650°C for 8h in N2 atmosphere, then heat up to 820°C for 6h, cool, sieve, classify by air flow and obtain the product.

[0025] The resulting product had a carbon content of 2.3%.

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Abstract

A synthetic method for a lithium ion cathode material LiNiO2 / C is characterized by comprising the following steps of: 1) adding water and mixing nickel oxide and an organic carbon source, carrying out spray granulation after ball-grinding treatment, and pre-treating the obtained powder in an inert atmosphere to obtain carbon-coated nickel oxide powder; 2) dissolving a lithium source in the water, adding the nickel oxide powder obtained in the step 1), and carrying out spray granulation after ball-grinding treatment to obtain dried powder; and 3) treating the dried powder obtained in the step 2) in the inert atmosphere, carrying out high-temperature heat treatment, and performing air classification, thereby obtaining the lithium ion cathode material LiNiO2 / C. According to the synthetic method, nickel oxide is firstly coated with carbon, so that lithium nickel oxide is prevented from agglomeration due to subsequent high-temperature treatment, over large grains of the lithium nickel oxide are prevented, the conductivity of the material is improved, and the cycling stability of the lithium nickel oxide is enhanced.

Description

technical field [0001] The invention relates to lithium ion battery cathode materials, in particular to a lithium ion cathode material LiNiO prepared by a carbon-coated nickel monoxide process. 2 / C synthesis method. Background technique [0002] At present, with the shortage of global oil resources and the continuous deterioration of the climate environment, the development of human society is facing severe challenges. The development of clean and energy-saving new energy vehicles is highly valued by countries all over the world. The key to the development of new energy vehicles lies in their power sources. Lithium-ion batteries have the advantages of high energy density, small self-discharge, no memory effect, wide operating voltage range, long service life, and no environmental pollution. They are currently the main power source for new energy vehicles. The key electrode material of lithium-ion battery is the final decisive factor of battery performance, and the positi...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/52H01M4/62
CPCH01M4/366H01M4/523H01M4/625H01M10/0525H01M4/36H01M4/52H01M4/62Y02E60/10
Inventor 田东
Owner 田东
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