A ternary lithium battery material, its preparation method and lithium ion battery

A lithium battery and lithium source technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as affecting the cycle performance, aggravation, and large stress of materials

Active Publication Date: 2019-01-15
SOUNDON NEW ENERGY TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The study found that the particle-to-particle connection structure inside the secondary particle will cause the local current density to rise, thereby generating a large stress, thereby affecting the cycle performance of the material; at the same time, there is also a charge between the various parts inside the particle. The phenomenon of inconsistent state, which affects the electrochemical performance of the electrode
[0004] In addition, when the delithiation amount is large, the structure of the NCM ternary material becomes very fragile, the active metal and oxygen in the crystal lattice are displaced, reaching a certain high temperature and high pressure, the atomic rearrangement is gradually intensified, and the grain volume and material On the other hand, chemical and electrochemical interactions with the electrolyte cause the material to be easily deoxidized and the transition metal dissolves

Method used

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  • A ternary lithium battery material, its preparation method and lithium ion battery
  • A ternary lithium battery material, its preparation method and lithium ion battery
  • A ternary lithium battery material, its preparation method and lithium ion battery

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preparation example Construction

[0035] Aiming at the problem in the prior art that the particle size of the ternary positive electrode material is small, and it is easy to produce micropowder to affect the cycle stability and safety of the battery, the present invention provides a method for preparing a ternary lithium battery material. The ternary lithium battery material particles prepared by the method are The diameter is large, and the distribution is uniform without fine powder. The material has a complete structure and good processing performance. As a positive electrode material, there will be no particle fragmentation during the cycle, which effectively prevents the direct contact between the surface of the material and the electrolyte, especially with The contact of HF in the electrolyte prevents the occurrence of side reactions and stabilizes the crystal structure of the material. When applied to lithium-ion batteries, especially high-voltage power lithium-ion batteries, it can effectively improve th...

Embodiment 1

[0059] (1) Weigh high-purity nickelous oxide, high-purity cobalt carbonate, and high-purity manganese carbonate by Ni: Co: Mn stoichiometric ratio 5:2:3 and place them in a ball mill, wherein the high-purity nickelous oxide material D50=3 μm, High-purity cobalt carbonate material D50 = 8 μm, high-purity manganese carbonate material D50 = 3 μm, ball milling and activation at 150 r / min for 1 hour to obtain D50 = about 6 μm nickel-cobalt-manganese mixture A1;

[0060] (2) Mix the materials A1, Li 2 CO 3 、Al 2 o 3 , mix according to the molar ratio of Li:Al:(Ni+Co+Mn)=1.05:0.01:0.99, add polyethylene glycol whose quality is 0.95% of the total mass of nickel-cobalt-manganese, add polyethylene glycol with a mass concentration of 10% Alcoholic aqueous solution, the mass of the aqueous solution is 15% of the total mass of nickel, cobalt and manganese, mixed and dispersed in the water system for 3 hours, spray dried, and pressed into block B1;

[0061] (3) Place the above-mentioned...

Embodiment 2

[0066] (1) Take high-purity nickel sesquioxide, high-purity tricobalt tetroxide, and high-purity manganese dioxide by Ni: Co: Mn stoichiometric ratio 6:2:2 and place them in a ball mill, wherein the high-purity nickel sesquioxide material D50= 5 μm, high-purity cobalt tetroxide material D50 = 10 μm, high-purity manganese dioxide material D50 = 8 μm, and ball milling at 300 r / min for 1.5 hours to obtain D50 = about 7 μm nickel-cobalt-manganese mixture A2;

[0067] (2) Add tetrabutyl titanate to isopropanol to prepare a tetrabutyl titanate solution with a molar concentration of 1%. After stirring for 10 minutes, a solution containing titanium element is obtained for use; mix materials A2, LiOH, titanium Acid tetrabutyl ester solution, mix according to the molar ratio of Li:Ti:(Ni+Co+Mn)=1.08:0.015:0.985, add Li 3 BO 3 Its mass is 0.15% of the total mass of nickel-cobalt-manganese, adding a polyvinyl alcohol aqueous solution with a mass concentration of 10%, the aqueous solution...

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Abstract

The invention provides a preparation method of ternary lithium battery material, comprising the following steps: A) ball milling and activating a nickel source, a cobalt source and a manganese sourceto obtain a mixed material; B) mix that mixed material, the lithium source, the flux, the compound of M and the polyvinyl alcohol, spray dry and pressing to obtain a block; C) grin that mass aft calcination to obtain a quasi-monocrystalline ternary material; D) grin that monocrystalline ternary material and the cladding material source and roast to obtain ternary lithium electric material; The coating source is one of LiCO3 and LiOH. H2O and one or more of Al2O3, ZrO2 and TiO2. The present application also provides the ternary lithium electric material and a lithium ion battery. The preparation method of the ternary lithium battery material provided by the present application synthesizes a monocrystalline ternary cathode material at one time by self-fusion of raw materials, has large particle size and uniform distribution, and is excellent in high-temperature storage performance and high-temperature cycling performance as the cathode material.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery electrode materials, in particular to a ternary lithium battery material, a preparation method thereof and a lithium ion battery. Background technique [0002] In recent years, due to the advantages of high specific energy, small size, light weight and long cycle performance, lithium-ion batteries are not only widely used in portable electronic devices such as notebook computers, digital cameras, and mobile devices, but also gradually used in electric vehicles. , hybrid electric vehicles, energy storage power supplies and other high-power equipment. In order to meet the requirements of high-power equipment, the development of cathode materials with high energy density, low cost, and good high-voltage cycle stability has become a research hotspot for battery cathode materials. Nickel cobalt lithium manganate (NCM) ternary cathode material (LiNi x co y mn 1-x-y o 2 , 0<x, y<1)...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/628H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 石谦齐士博陈小平肖君林彭俊明
Owner SOUNDON NEW ENERGY TECH CO LTD
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