Lithium ion battery cathode material and preparation method thereof

A technology for lithium-ion batteries and cathode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as poor electrochemical cycle performance, and achieve the effects of excellent crystal quality, reduced energy consumption, and close chemical composition

Inactive Publication Date: 2015-11-04
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
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Problems solved by technology

[0005] The object of the present invention is to aim at lithium ion battery cathode material lithium nickelate (LiNiO 2 ) the shortcomings ...

Method used

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  • Lithium ion battery cathode material and preparation method thereof
  • Lithium ion battery cathode material and preparation method thereof
  • Lithium ion battery cathode material and preparation method thereof

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Embodiment

[0037] Dissolve nickel sulfate (0.8mol) and aluminum nitrate (0.025mol) in proportion to 500mL of deionized water to completely dissolve to obtain solution A; dissolve cobalt sulfate (0.15mol) and aluminum nitrate (0.025mol) in proportion Dissolve it completely in 250mL deionized water to obtain solution B; dissolve a proportional amount (2.0mol) of NaOH in 500mL fresh deionized water and dissolve it completely to obtain solution C; dissolve 150ml concentrated ammonia water in 150mL fresh deionized water , so that it is completely dissolved to obtain solution D;

[0038] Add solutions A, B, C, and D at a certain speed in parallel and add strong stirring with N 2 Co-precipitate in the protected reactor, control the flow rate of the solution so that the four solutions are added at the same time and the temperature in the reactor is controlled at 50-80 °C; the concentration of NaOH solution is 4mol / L, and the pH value of the reaction tank material is adjusted after adding. 11.0 ...

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Abstract

The invention belongs to the field of a lithium ion battery, and provides a doped and modified layered lithium ion battery cathode material LiNi<1-x-y>CoxAlyO2 and a preparation method thereof, wherein x is more than 0 and less than or equal to 0.2, y is more than or equal to 0 and less than or equal to 0.1, and (x+y) is more than 0 and less than or equal to 0.3. The lithium ion battery cathode material LiNi<1-x-y>CoxAlyO2 is obtained by simultaneously doping trivalent elemental aluminum and divalent element cobalt to replace elemental nickel in the cathode material. The cathode material is endowed with high discharging specific capacity and excellent cyclic stability performance, and the high-rate charging and discharging demand can be met; parallel flow and co-precipitation of four solutions combined with a solid-phase synthesis method are used for preparing the cathode material; and by the method, the defects of long preparation time, difficulty in controlling stoichiometric proportion, non-uniform distribution of product grain sizes, poor electrochemical property and the like of the solid-phase synthesis method are overcome, the prepared product is high in purity and high in crystalline quality, high and uniformly-distributed product grain density is achieved, electrochemical property is excellent, and manufacturing cost is low.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, and relates to a lithium-ion battery positive electrode material and a preparation method thereof, specifically LiNi, a lithium-ion battery positive electrode material 1-x-y co x Al y o 2 , wherein 0<x≤0.2, 0≤y≤0.1, 0<x+y≤0.3; and a method for preparing the cathode material. Background technique [0002] With the deteriorating global environment and the depletion of oil and other resources, the research and development of energy conservation and emission reduction and green energy is imminent. Both at home and abroad attach great importance to the development and application of new energy and renewable clean energy. Lithium-ion battery is one of the more promising new green energy sources. Due to the advantages of high energy density, fast charging, small self-discharge, long-term storage, excellent cycle performance, no memory effect, wide operating temperature, and light weight, l...

Claims

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Application Information

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IPC IPC(8): H01M4/525H01M10/0525
CPCH01M4/525H01M10/0525Y02E60/10
Inventor 刘兴泉熊伟强赵红远陈炳张峥
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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