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Preparation method of three-dimensional reticular carbon coating ternary positive electrode material

A positive electrode material and three-dimensional technology, which is applied in the field of preparation of three-dimensional mesh carbon-coated ternary positive electrode materials, can solve the problem of reduced battery energy storage and cycle performance, high internal resistance, and poor communication between electrode active materials and current collectors and other problems, to achieve the effect of strong adsorption, light weight and small specific gravity

Pending Publication Date: 2022-01-11
陕西红马科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the electrode active material accumulates thickly, it will cause poor communication between the electrode active material and the current collector, which will cause excessive internal resistance and reduce the energy storage and cycle performance of the battery.

Method used

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  • Preparation method of three-dimensional reticular carbon coating ternary positive electrode material
  • Preparation method of three-dimensional reticular carbon coating ternary positive electrode material
  • Preparation method of three-dimensional reticular carbon coating ternary positive electrode material

Examples

Experimental program
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Effect test

Embodiment 1

[0040] A method for preparing a three-dimensional network carbon-coated ternary positive electrode material, comprising the following process steps:

[0041] Step 1: Preparation of organic carbon source solution: Weigh CMC powder and dissolve it in ultrapure water with a magnetic stirrer, cut it for 1 hour to prepare a solution with a concentration of 1.0%, and let it stand for 5 hours to swell.

[0042] Step 2: disperse graphite in sodium carboxymethyl cellulose aqueous solution, and use a ball mill to mill at 3000 r / min for 30 min, the mass ratio between sodium carboxymethyl cellulose solution and graphite is 1:1.

[0043] Step 3: LiNi 0.6 co 0.1 mn 0.3 o 2 Preparation: Li 2 CO 3 and cathode material precursor Ni 0.6 co 0.1 mn 0.3 (OH) 2 After mixing evenly at a molar ratio of 1.05:1, place it in an atmosphere furnace with an oxygen flow rate of 15L / min and a heating rate of 1.5°C / min. After sintering at 950°C for 11 hours, cool to room temperature, crush and sieve ...

Embodiment 2

[0048] A method for preparing a three-dimensional network carbon-coated ternary positive electrode material, comprising the following process steps:

[0049] Step 1: Preparation of organic carbon source solution: Weigh CMC powder and dissolve it in ultrapure water with a magnetic stirrer, cut it for 1 hour to prepare a solution with a concentration of 2.0%, and let it stand for 5 hours to swell.

[0050] Step 2: Disperse acetylene black in an aqueous solution of sodium carboxymethyl cellulose, and use a ball mill at 3000 r / min to mill for 30 minutes. The mass ratio between sodium carboxymethyl cellulose solution and graphite is 3:1.

[0051] Step 3: Ternary cathode material LiNi 0.6 co 0.1 mn 0.3 o 2 Preparation: Li 2 CO 3 and cathode material precursor Ni 0.6 co 0.1 mn 0.3 (OH) 2 After mixing evenly at a molar ratio of 1.05:1, place it in an atmosphere furnace with an oxygen flow rate of 15L / min and a heating rate of 1.5°C / min. After sintering at 950°C for 12 hours, ...

Embodiment 3

[0056] A method for preparing a three-dimensional network carbon-coated ternary positive electrode material, comprising the following process steps:

[0057] Step 1: Preparation of organic carbon source solution: Weigh CMC powder and dissolve it in ultrapure water with a magnetic stirrer, cut it for 1 hour to prepare a solution with a concentration of 2.0%, and let it stand for 5 hours to swell.

[0058] Step 2: Disperse acetylene black in an aqueous solution of sodium carboxymethyl cellulose, and use a ball mill at 3000 r / min to mill for 30 minutes. The mass ratio between sodium carboxymethyl cellulose solution and graphite is 3:1.

[0059] Step 3: Ternary cathode material LiNi 0.7 co 0.1 mn 0.2 o 2 The preparation of LiOH and cathode material precursor Ni 0.7 co 0.1 mn 0.2 (OH) 2 After mixing evenly at a molar ratio of 1.04:1, place it in an atmosphere furnace with an oxygen flow rate of 15L / min and a heating rate of 1°C / min. After sintering at 930°C for 11 hours, coo...

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Abstract

The invention discloses a preparation method of a three-dimensional reticular carbon coating ternary positive electrode material, and relates to the technical field of lithium battery positive electrode materials, and the preparation method comprises the following steps of: (1) preparing a conductive carbon coating; (2) preparing a ternary positive electrode material; and (3) preparing the three-dimensional reticular carbon coating ternary positive electrode material. The positive electrode material provided by the invention has good conductivity and cycle performance, the problem that an expansion material is easy to fall off due to volume expansion is relieved, and the integrity and long-term cycle performance of an electrode are ensured. And meanwhile, the problem of generation of impure phases due to oxidation reduction can be effectively inhibited. In addition, the preparation method provided by the invention is simple to operate and beneficial to industrial popularization.

Description

technical field [0001] The invention relates to the technical field of cathode materials for lithium batteries, and more specifically relates to a preparation method of a three-dimensional network carbon-coated ternary cathode material. Background technique [0002] With the wide application and rapid development of lithium batteries, people have higher and higher performance requirements for lithium-ion batteries, which not only require lithium batteries to have a higher capacity, but also require better capacity retention during repeated charging and discharging. rate, exhibits good cycle performance, and has a long service life. [0003] In the prior art, the electrode active material of the lithium-ion battery is attached to the metal foil as a current collector in a thin layer under the action of a binder, so as to ensure that the electrons generated by the electrode active material in the process of lithium intercalation and deintercalation can be collected in time on...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/50H01M4/505H01M4/52H01M4/525H01M4/62H01M4/66H01M4/70H01M10/0525
CPCH01M4/366H01M4/625H01M4/668H01M4/70H01M4/502H01M4/505H01M4/523H01M4/525H01M10/0525H01M2004/028Y02E60/10
Inventor 田咪咪方胜庭田新勇高彦宾
Owner 陕西红马科技有限公司