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Method for preparing high-performance spherical lithium ion secondary battery cathode material

A cathode material and secondary battery technology, applied in the direction of battery electrodes, chemical instruments and methods, circuits, etc., can solve problems such as poor safety performance and cycle life, deterioration of electrolyte reaction, and poor battery performance, and achieve easy manufacturing methods , avoid low-valence ions, and reduce the effect of Co content

Active Publication Date: 2011-06-29
HENAN KELONG NEW ENERGY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them LiNi c co d mn 1-c-d o 2 (0≤c≤0.6) low specification capacity, good safety performance, outstanding high-rate discharge performance, long cycle life, suitable for power tools; LiNi a co b mn 1-a-b o 2 (0.6≤a≤1) The specification capacity is high, suitable for various small mobile power sources, as LiCoO 2 Alternative materials have good application prospects, but their safety performance and cycle life are poor, the discharge platform is low, and they are prone to deterioration reactions with the electrolyte, resulting in poor battery performance

Method used

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  • Method for preparing high-performance spherical lithium ion secondary battery cathode material
  • Method for preparing high-performance spherical lithium ion secondary battery cathode material
  • Method for preparing high-performance spherical lithium ion secondary battery cathode material

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Synthetic formula LiNi 0.6 co 0.2 mn 0.2 o 2 (LiNi 0.5 co 0.25 mn 0.25 o 2 ·LiNi 0.4 co 0.3 mn 0.3 o 2 ) as an example, by Ni: Co: Mn=0.6: 0.2: 0.2 molar ratio preparation 2mol / L transition element nickel, cobalt and manganese sulfate mixed solution, and 6mol / L ammonia solution and 4mol / L NaOH solution, According to the flow rate of 1L / min, 0.5L / min, and 1.25L / min, inject it into a 25L reactor, keep the reaction temperature at 65°C, and the pH value at 10.0, and react in the reactor at a speed of 400r / min. for 6h, Uniform spherical Ni can be obtained after washing, filtering and drying 0.6 co 0.2 mn 0.2 (OH) 2 Precursor. Then add it in the 50L reactor, add 4 times the quality of deionized water; press the molar ratio of Ni:Co:Mn=0.5:0.25:0.25 to prepare the sulfuric acid of transition elements nickel, cobalt and manganese of 0.5mol / L Salt mixed solution, the total amount of solute in sulfate solution is Ni 0.6 co 0.2 mn 0.2 (OH) 2 40% of the 1L / min f...

Embodiment 2

[0028] Synthetic formula LiNi 0.6 co 0.2 mn 0.2 o 2 (LiNi 0.4 co 0.3 mn 0.3 o 2 ·LiNi 0.33 co 0.33 mn 0.33 o 2 ) as an example, according to the molar ratio of Ni:Co:Mn=0.6:0.2:0.2, prepare 1.5mol / L transition element nickel, cobalt and manganese sulfate mixed solution, and 5mol / L ammonia solution and 4mol / L NaOH solution , according to the flow rate of 1L / min, 0.5L / min, 1.25L / min respectively into the 25L reactor, keep the reaction temperature at 65 ℃, pH value 10.0, react in the reactor at 400r / min. speed for 6h , uniform spherical Ni can be obtained after washing, filtering and drying 0.6 co 0.2 mn 0.2 (OH) 2 Precursor. Then add it in the 50L reactor, add 4 times the quality of deionized water; press the molar ratio of Ni: Co: Mn=0.4: 0.3: 0.3 to prepare the sulfuric acid of transition elements nickel, cobalt and manganese of 0.75mol / L Salt mixed solution, the total amount of solute in sulfate solution is Ni 0.6 co 0.2 mn 0.2 (OH) 2 40% of the 1L / min flo...

Embodiment 3

[0032] Synthetic formula LiNi 0.7 co 0.15 mn 0.15 o 2 (LiNi 0.5 co 0.25 mn 0.25 o 2 ·LiNi 0.4 co 0.4 mn 0.4 o 2 ) as an example, according to the molar ratio of Ni:Co:Mn=0.7:0.15:0.15, prepare 2.5mol / L transition element nickel, cobalt and manganese sulfate mixed solution, and 7mol / L ammonia solution and 5mol / L NaOH solution , according to the flow rate of 1L / min, 0.5L / min, 1.25L / min respectively into the 50L reactor, keep the reaction temperature at 70 ℃, pH value of 10.5, react in the reactor at 350r / min. speed for 6h , uniform spherical Ni can be obtained after washing, filtering and drying 0.7 co 0.15 mn 0.15 (OH) 2 Precursor. Then add it into a 100L reactor and add 6 times the mass of deionized water; prepare 1mol / L of transition element nickel, cobalt and manganese sulfate at a molar ratio of Ni:Co:Mn=0.5:0.25:0.25 Mixed solution, the amount of the total substance of the sulfate solution solute is Ni 0.6 co 0.2 mn 0.2 (OH) 2 40% of the 1L / min flow rate ...

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Abstract

The invention provides a method for preparing a high-performance spherical lithium ion secondary battery cathode material. The method comprises the steps of synthesizing a NiaCobMn1-a-b(OH)2 precursor through adopting a coprecipitation-crystallization method, coating NicCodMn1-c-d(OH)2NieCofMn1-e-f(oh)2 composite layer on the surface of the precursor through adopting a chemical method, and then fully mixing with lithium salt to prepare a high-performance spherical lithium ion secondary battery cathode material LiNiaCobMn1-a-bO2(LiNicCobMn1)-c-dO2LiNieCofMn1-e-fO2) through stepwise sintering. The cathode material prepared by adopting the method has high density, good activity, and accurate stoichiometric proportion. Malignant interaction between the cathode material and an electrolyte is avoided, capacity decrease caused by non- electrochemical active substances is prevented, and the circulating life of materials is prolonged. The method is easy to control, has a low manufacturing cost, and is convenient for mass production, so as to create conditions for the development of high-capacity lithium ion batteries.

Description

technical field [0001] The utility model relates to lithium battery production technology, in particular to a preparation method of a high-performance spherical lithium ion secondary battery cathode material. Background technique [0002] Energy crisis and environmental pollution are severe challenges faced by human beings, and finding clean and renewable secondary energy is an urgent task to realize the sustainable development of human society. Among the many secondary battery systems, lithium-ion batteries have the advantages of high working voltage, high energy density, long cycle life, low self-discharge rate, and environmental protection, and have become the main trend of secondary battery development. Lithium cobalt oxide (LiCoO 2 ), lithium manganese oxide with spinel structure (LiMn 2 o 4 ), ternary material LiNi A co B mn 1-A-B o 2 , olivine-type lithium iron phosphate (LiFePO 4 ). [0003] LiCoO 2 It is currently the most commonly used commercial lithium-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1391H01M4/485C01G53/00
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 王明强徐拥军程迪尹正中王明彩
Owner HENAN KELONG NEW ENERGY CO LTD
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