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A kind of positive electrode material of lithium ion battery and preparation method thereof

A technology for lithium-ion batteries and positive electrode materials, applied in the field of lithium-ion battery positive electrode materials and their preparation, can solve problems such as large gaps, large contact resistance, and large impedance, so as to reduce the difficulty of dispersion, reduce internal resistance, and eliminate negative effects. Effect

Active Publication Date: 2019-11-05
GUANGDONG ZHUGUANG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, the contact area between the primary particles of the nanostructure and the conductive agent is small and the gap is large, so the contact resistance is relatively large, and the internal resistance of the finished positive electrode material is relatively large, which affects the lithium ions that use it as the positive electrode material. The electrochemical performance of the battery is fully developed (mainly manifested as large impedance, large polarization, and severe heat generation)

Method used

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  • A kind of positive electrode material of lithium ion battery and preparation method thereof

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Embodiment 1

[0036] Embodiment 1, differs from comparative example in that this embodiment comprises the following steps:

[0037] Step 1, kneading: lithium iron phosphate, methyl methacrylate, sodium lauryl sulfate (mass ratio is: lithium iron phosphate: methyl methacrylate: sodium lauryl sulfate=93 :1:1), NMP (solid content is 1%) mixed and kneaded, the revolution is 60 turns / min, and the rotation is 500 turns / min; Kneading 2h obtains mixture 1; Conductive carbon black, polyvinylpyrrolidone (mass ratio is Conductive carbon black: polyvinylpyrrolidone=4.9:0.1) and NMP (solid content is 0.5%) are mixed and kneaded, the revolution is 60 revolutions / min, and the rotation is 500 revolutions / min; Kneading 2h obtains mixture 2; Mixture 1, mixture 2 (mass ratio is lithium iron phosphate: conductive carbon black=93:4.9) mixed together, continue kneading, revolution is 20 revolutions / min, and rotation is 300 revolutions / min; After kneading 2h, obtain polymer monomer, nano iron phosphate Mixed slu...

Embodiment 2

[0042] Embodiment 2 is different from Embodiment 1 in that this embodiment includes the following steps:

[0043] Step 1, kneading: lithium iron phosphate, methyl methacrylate, sodium lauryl sulfate (mass ratio is: lithium iron phosphate: methyl methacrylate: sodium lauryl sulfate=93 :1:1), NMP (solid content is 5%) are mixed and then kneaded, the revolution is 20 turns / min, and the rotation is 300 turns / min; Kneading 2h obtains mixture 1; Conductive carbon black, polyvinylpyrrolidone (mass ratio is Conductive carbon black: polyvinylpyrrolidone=4.9:0.1) and NMP (solid content is 2%) are mixed and kneaded, the revolution is 20 revolutions / min, and the rotation is 300 revolutions / min; kneading 2h to obtain mixture 2; Mixture 1, mixture 2 (mass ratio is lithium iron phosphate: conductive carbon black=93:4.9) mixed together, continue kneading, revolution is 20 turns / min, and rotation is 300 turns / min; After kneading 2h, obtain polymer monomer, nano iron phosphate Mixed slurry wit...

Embodiment 3

[0047] Embodiment 3 is different from Embodiment 1 in that this embodiment includes the following steps:

[0048] Step 1, kneading: lithium iron phosphate, methyl methacrylate, sodium lauryl sulfate (mass ratio is: lithium iron phosphate: methyl methacrylate: sodium lauryl sulfate=93 :1:1), NMP (solid content is 10%) are mixed and then kneaded, the revolution is 10 turns / min, and the rotation is 100 turns / min; Kneading 4h obtains mixture 1; Conductive carbon black, polyvinylpyrrolidone (mass ratio is Conductive carbon black: polyvinylpyrrolidone=4.9:0.1) and NMP (solid content is 5%) are mixed and kneaded, the revolution is 10 revolutions / min, and the rotation is 100 revolutions / min; kneading 4h obtains mixture 2; Mixture 1, mixture 2 (mass ratio is lithium iron phosphate: conductive carbon black=93:4.9) mixed together, continue kneading, revolution is 10 revolutions / min, and rotation is 100 revolutions / min; After kneading 4h, obtain polymer monomer, nano iron phosphate Mixed...

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Abstract

The invention belongs to the field of energy storage research, and particularly relates to a positive electrode material for a lithium-ion battery. The positive electrode material for the lithium-ion battery comprises a core structure and a shell structure, wherein the core structure adopts a secondary particle structure formed by uniformly dispersing primary nanoparticles into conductive agents and then densely stacking; the primary nanoparticles comprise at least one of nanometer lithium cobaltate, nanometer lithium manganate, nanometer lithium iron phosphate, nanometer nickel cobalt manganese, nanometer nickel cobalt aluminum, nanometer lithium nickelate, nanometer lithium vanadium oxide and a nanometer lithium-enriched cathode material; in addition, conductive networks are distributed between the primary nanoparticles, between the conductive agents and between the primary nanoparticles and the conductive agents, and the conductive networks are tightly connected with the primary nanoparticles and the conductive agents so as to ensure that the positive electrode material for the lithium-ion battery has excellent electrochemical performance.

Description

technical field [0001] The invention belongs to the technical field of energy storage materials, and in particular relates to a positive electrode material of a lithium ion battery and a preparation method thereof. Background technique [0002] Lithium-ion batteries have brought revolutionary changes to the field of energy storage since their birth due to their advantages such as fast charging and discharging, good low-temperature performance, large specific energy, small self-discharge rate, small size, and light weight. Used in various portable electronic devices and electric vehicles. However, with the improvement of people's living standards, higher user experience puts forward higher requirements for lithium-ion batteries: longer standby time, faster charging and discharging speed, etc.; in order to solve the above problems, it is necessary to find new ones with better performance electrode material. [0003] At present, the commercial lithium-ion battery cathode mate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/60H01M4/62H01M4/133H01M4/1393H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/133H01M4/1393H01M4/505H01M4/525H01M4/602H01M4/62H01M10/0525Y02E60/10
Inventor 毛方会杨玉洁
Owner GUANGDONG ZHUGUANG NEW ENERGY TECH
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