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Lithium ion battery positive electrode material and preparation method therefor

A lithium-ion battery and cathode material technology, applied in the field of lithium-ion battery cathode materials and its preparation, can solve the problems affecting the electrochemical performance of lithium-ion batteries, small contact area, large contact resistance, etc., to achieve the elimination of side reactions of gas production, The effect of increasing the contact area and ensuring stability

Active Publication Date: 2017-08-29
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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  • Lithium ion battery positive electrode material and preparation method therefor

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Embodiment 1

[0040] Embodiment 1, differs from comparative example in that this embodiment comprises the following steps:

[0041] Step 1, preparation of precursor: lithium iron phosphate, methyl methacrylate, sodium lauryl sulfate (mass ratio is lithium iron phosphate: methyl methacrylate: sodium lauryl sulfate = 95:4:1), kneading after NMP mixing (solid content is 10%), the revolution is 30 rpm, and the rotation is 300 rpm; kneading for 4 hours to obtain a uniformly dispersed precursor;

[0042] Step 2, preparation of modified worm-like graphene-dominated conductive network structure: select microcrystalline graphite as raw material, then add concentrated sulfuric acid and potassium permanganate for oxidation intercalation to obtain graphite oxide, and then heat-treat to obtain worm-like graphene; The worm-shaped graphene is placed in a mixture of concentrated sulfuric acid, potassium permanganate, and sodium nitrate to modify it to obtain a modified worm-shaped graphene grafted with 1% ...

Embodiment 2

[0047] Embodiment 2 is different from Embodiment 1 in that this embodiment includes the following steps:

[0048] Step 2, preparation of modified worm-like graphene-dominated conductive network structure: select microcrystalline graphite as raw material, then add concentrated sulfuric acid and potassium permanganate for oxidation intercalation to obtain graphite oxide, and then heat-treat to obtain worm-like graphene; The worm-like graphene is placed in the mixture of concentrated sulfuric acid, potassium permanganate and sodium nitrate to modify it, and the modified worm-like graphene grafted with 5% functional groups is obtained for use;

[0049] The rest are the same as in Embodiment 1 and will not be repeated here.

Embodiment 3

[0050] Embodiment 3 is different from Embodiment 1 in that this embodiment includes the following steps:

[0051] Step 2, preparation of modified worm-like graphene-dominated conductive network structure: select microcrystalline graphite as raw material, then add concentrated sulfuric acid and potassium permanganate for oxidation intercalation to obtain graphite oxide, and then heat-treat to obtain worm-like graphene; The worm-like graphene is placed in the mixture of concentrated sulfuric acid, potassium permanganate and sodium nitrate to modify it, and the modified worm-like graphene with 15% functional groups is obtained for use;

[0052] The rest are the same as in Embodiment 1 and will not be repeated here.

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Abstract

The invention belongs to the energy storage research field, and particularly relates to a lithium ion battery positive electrode material. The lithium ion battery positive electrode material comprises a core structure and a shell structure; the core structure is a secondary granular structure, comprising main conductive networks with a porous structure and nanometer primary particles arranged in the porous structure of the main conductive networks in a filling manner; the nanometer primary particles comprise at least one kind of nanometer lithium cobalt oxides, nanometer lithium manganate, nanometer lithium iron phosphate, nanometer nickel cobalt manganese, nanometer nickel cobalt aluminum, nanometer lithium nickelate, nanometer lithium vanadium oxide and nanometer lithium-rich positive electrode material; relatively strong chemical bonds and acting force exist between the main conductive structures; and by virtue of the chemical bonds, the nanometer primary granules are tightly locked in the porous structure of the main conductive networks. Therefore, it is ensured that the lithium ion battery positive electrode 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 Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/525H01M4/505H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/505H01M4/525H01M4/5825H01M4/625H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 毛方会杨玉洁
Owner GUANGDONG ZHUGUANG NEW ENERGY TECH
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