High-nickel ternary positive electrode material coated with lithium iron phosphate nano-powder and preparation method thereof, and applications

A high-nickel ternary material, lithium iron phosphate technology, applied in the field of lithium-ion batteries, can solve problems such as restricting practical applications, short cycle life, and poor high-temperature stability, and achieve improved thermal stability, reduced contact area, and reaction conditions. mild effect

Inactive Publication Date: 2019-09-13
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, high-nickel ternary cathode materials have problems such as poor high temperature stability and short cycle life, which restrict their practical application in actual batteries.
[0003] In recent years, the coating of various metal oxides, fluorides, and phosphates on high-nickel ternary materials has been studied, but the coating of lithium iron phosphate nanoparticles on the surface of high-nickel ternary materials by sol-gel method and spray drying technology The powder method is still not reported

Method used

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  • High-nickel ternary positive electrode material coated with lithium iron phosphate nano-powder and preparation method thereof, and applications
  • High-nickel ternary positive electrode material coated with lithium iron phosphate nano-powder and preparation method thereof, and applications
  • High-nickel ternary positive electrode material coated with lithium iron phosphate nano-powder and preparation method thereof, and applications

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Preparation of uncoated LiNi 0.6 co 0.2 mn 0.2 o 2 Ternary cathode material, comprising the following steps:

[0029] 1) Dissolve nickel sulfate, cobalt sulfate, and manganese sulfate in deionized water at a molar ratio of 6:2:2 to prepare a 1mol / L solution, and add the solution with 2mol / L sodium hydroxide and 2mol / L ammonia water at a constant speed In a 10L reactor; control the stirring reaction temperature to 50°C, control the pH of the reaction system to 10.8, control the stirring speed to 1000rmp, the stirring time to 8h, and control the nitrogen flow rate of the reaction protection gas to 10L / min. Aging for 12h after the stirring reaction ended, after filtering, washing and drying, the (Ni 0.6 co 0.2 mn 0.2 )(OH) 2 Precursor;

[0030] 2) Combine LiOH with (Ni 0.6 co 0.2 mn 0.2 )(OH) 2 Weigh 100g and 108g of the precursor and the lithiation ratio of 1:1.08, respectively, and put them into a high-speed mixer for ball milling. The speed is set at 800r / mi...

Embodiment 2

[0033] The present invention proposes a lithium-ion battery high-nickel ternary positive electrode material coated with lithium iron phosphate on the surface, comprising the following steps:

[0034] Step 1)-3) obtains the LiNi that surface does not have coating with embodiment 1 0.6 co 0.2 mn 0.2 o 2 Ternary cathode material.

[0035]4) Weigh 15.48g of PEG2000 and add it into 400ml of deionized water, and add 1g of lithium iron phosphate nanopowder into it under constant temperature stirring at 60°C, and continue stirring for 1h until a sol is formed. Take by weighing 50g step 3) LiNi prepared 0.6 co 0.2 mn 0.2 o 2 The ternary material powder is added to the obtained sol, and the mixture is obtained by stirring at 60° C. for 10 h, and the coating content of the nickel-cobalt-manganese ternary material is controlled to be 2 wt %.

[0036] 5) Dry the mixture obtained in step 4) with a spray device. Under the action of hot air at 100°C to 220°C, the volume of the colloid...

Embodiment 3

[0042] The present invention proposes a lithium-ion battery high-nickel ternary positive electrode material coated with lithium iron phosphate on the surface, comprising the following steps:

[0043] Step 1)-3) obtains the LiNi that surface does not have coating with embodiment 1 0.6 co 0.2 mn 0.2 o 2 Ternary cathode material.

[0044] 4) Weigh 15.48g of PEG2000 and add it into 400ml of deionized water, and add 1g of lithium iron phosphate nanopowder into it under constant temperature stirring at 60°C, and continue stirring for 1h until a sol is formed. Take by weighing 50g step 3) LiNi prepared 0.6 co 0.2 mn 0.2 o 2 The ternary material powder is added into the obtained sol, and the mixture is obtained by stirring at 80° C. for 10 h, and the coating content of the nickel-cobalt-manganese ternary material is controlled to be 2 wt%.

[0045] 5) Dry the mixture obtained in step 4) with a spray device. Under the action of hot air at 100-220°C, the volume of the colloid sh...

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Abstract

The present invention relates to a high-nickel ternary positive electrode material coated with lithium iron phosphate nano-powder and a preparation method thereof. The preparation method comprises thefollowing steps: (1) mixing a nickel-cobalt-manganese precursor and a lithium source according to a certain lithiation ratio in mixing equipment to obtain a ternary precursor mixer; (2) calcining andgrinding the ternary precursor mixer obtained in step (1); preparing a polyethylene glycol solution, adding the lithium iron phosphate nano-powder into the solution, stirring until a gel is formed, immersing the high-nickel ternary material without being coated with the lithium iron phosphate into the gel, and continuously stirring to obtain a mixer; and (4) drying, allowing the lithium iron phosphate to be coated on the surface of the high-nickel ternary material, sintering the obtained dry material, and grinding to obtain the high-nickel ternary positive electrode material coated with the lithium iron phosphate. The high-nickel ternary positive electrode material coated with the lithium iron phosphate has excellent cycle stability and high rate capability, and thus the material is the potential application material of high-power and long-life lithium batteries.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a lithium iron phosphate nanometer powder-coated high-nickel ternary positive electrode material and a preparation method thereof. The material can be used as a high-rate, long-life lithium-ion battery positive electrode active material. Background technique [0002] Lithium-ion batteries have been maturely used in 3C electronic products and small power lithium battery markets such as power tools and electric vehicles. Layered lithium-nickel-cobalt-manganese oxides, as cathode materials for lithium-ion batteries, have attracted extensive attention from scholars due to their high capacity, high performance and low cost. However, the poor high temperature stability and short cycle life of high-nickel ternary cathode materials restrict their practical application in practical batteries. [0003] In recent years, the coating of various metal oxides, fluorides, and phosphates on ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/62H01M4/525H01M4/505H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/62H01M4/628H01M10/0525Y02E60/10
Inventor 韩春华方旭麦立强
Owner WUHAN UNIV OF TECH
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