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Anode material for lithium ion battery and preparation method of anode material

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 contact resistance, small contact area, and large impedance, and achieve the goal of reducing contact resistance, increasing contact area, and reducing resistance Effect

Active Publication Date: 2017-09-26
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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  • Anode material for lithium ion battery and preparation method of anode material

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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 = 100:2:1), after mixing NMP (solid content is 10%) and kneading, 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 worm-like graphene-dominated conductive network structure: select microcrystalline graphite as raw material, then add concentrated sulfuric acid and potassium permanganate for oxidative intercalation, and obtain graphite oxide whose oxygen-containing functional group accounts for 15% of the total mass of graphite oxide. Then heat treatment to obtain worm-like graphene for use;

[0043] Step 3, filling: Vacuum the worm-like graphene obtained in step 2, then place it in...

Embodiment 2

[0046] Embodiment 2 is different from Embodiment 1 in that this embodiment includes the following steps:

[0047] Step 2, preparation of worm-like graphene-dominated conductive network structure: select microcrystalline graphite as raw material, then add concentrated sulfuric acid and potassium permanganate for oxidative intercalation to obtain graphite oxide whose oxygen-containing functional group accounts for 5% of the entire graphite oxide mass, Then heat treatment to obtain worm-like graphene for use;

[0048] The rest are the same as in Embodiment 1 and will not be repeated here.

Embodiment 3

[0049] Embodiment 3 is different from Embodiment 1 in that this embodiment includes the following steps:

[0050] Step 2, preparation of worm-like graphene-dominated conductive network structure: select microcrystalline graphite as raw material, then add concentrated sulfuric acid and potassium permanganate for oxidative intercalation, and obtain graphite oxide whose oxygen-containing functional group accounts for 20% of the mass of the entire graphite oxide. Then heat treatment to obtain worm-like graphene for use;

[0051] 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 technical field of energy storage materials and particularly relates to an anode material for a lithium ion battery. The anode material comprises a nuclear structure and a shell structure, wherein the nuclear structure is a secondary particle structure and comprises a main conduction network in a porous structure and nanometer primary particles filled in the porous main conduction network structure; the nanometer primary particles comprise at least one of nanometer lithium cobalt oxide, nanometer lithium manganite, nanometer lithium iron phosphate, nanometer nickel-cobalt-manganese, nanometer nickel-cobalt-aluminum, nanometer lithium vanadium oxide and a nanometer lithium-rich cathode material; an auxiliary conduction network is distributed between the main conduction network and the nanometer primary particles and is used for tightly connecting the main conduction network and the nanometer primary particles, so that the excellent electrochemical performance of the anode material for the lithium ion battery is ensured.

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): H01M4/36H01M4/505H01M4/525H01M4/60H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/362H01M4/505H01M4/525H01M4/602H01M4/62H01M10/0525Y02E60/10
Inventor 毛方会杨玉洁
Owner GUANGDONG ZHUGUANG NEW ENERGY TECH
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