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Preparation method of composite electrode, composite electrode and lithium ion battery

A composite electrode and discharge plasma technology, which is applied to battery electrodes, secondary batteries, circuits, etc., can solve problems such as interface instability and large interface impedance, and achieve the effect of shortening the preparation time

Inactive Publication Date: 2019-09-10
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are problems such as large interface impedance and unstable interface between positive electrode materials and solid electrolytes.

Method used

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  • Preparation method of composite electrode, composite electrode and lithium ion battery
  • Preparation method of composite electrode, composite electrode and lithium ion battery
  • Preparation method of composite electrode, composite electrode and lithium ion battery

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preparation example Construction

[0036] see figure 1 , a method for preparing a composite electrode provided in an embodiment of the present invention, comprising the following steps:

[0037] Step S1: mixing a ternary positive electrode material 10, a solid electrolyte 20 and a conductive agent 30 to obtain a precursor;

[0038] Step S2: performing discharge plasma sintering on the precursor, so that the ternary positive electrode material 10, the solid electrolyte 20 and the conductive agent 30 are combined into one body, so as to obtain the composite electrode 100.

[0039] In step S1, the ternary positive electrode material 10 is at least one of nickel-cobalt-manganese ternary material (NCM) and nickel-cobalt-aluminum ternary material (NCA) commonly used in lithium-ion battery positive electrode materials, such as LiNi 0.8 co 0.15 al 0.05 o 2 .

[0040] The solid electrolyte 20 is at least one of the commonly used solid electrolytes 20 for lithium ion batteries, such as garnet-type solid electrolyte ...

Embodiment

[0064] Take LiNi 0.8 co 0.15 al 0.05 o 2 (NCA) as a ternary cathode material 10, Li 6.4 La 3 Zr 1.4 Ta 0.6 o 12 (LLZTO) as solid electrolyte 20, indium tin oxide (ITO) as conductive agent 30, LiNi 0.8 co 0.15 al 0.05 o 2 , Li 6.4 La 3 Zr 1.4 Ta 0.6 o 12 Mixed with indium tin oxide in a mass ratio of 6:3:1, and then placed in a ball mill jar for ball milling for 30 minutes to obtain a uniformly mixed precursor; the precursor was cold-pressed, and then mixed with Li 6.4 La 3 Zr 1.4 Ta 0.6 o 12 The powder is cold-pressed at a mass ratio of 1:1, and a precursor having a double-layer structure of the precursor and the solid electrolyte 20 is prepared first.

[0065] Then the precursor is subjected to spark plasma sintering treatment. Place the precursor of the double-layer structure in the discharge plasma sintering equipment, raise the temperature to 500°C at a heating rate of 100°C / min, and then raise the temperature at a heating rate of 50°C / min, and control...

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Abstract

The invention provides a preparation method of a composite electrode. The preparation method comprises the following steps: mixing a ternary positive electrode material, a solid electrolyte and a conductive agent to obtain a precursor; carrying out discharge plasma sintering on the precursor, so that the ternary positive electrode material, the solid electrolyte and the conductive agent are combined into a whole to obtain a composite electrode. The invention further provides the composite electrode and a lithium ion battery. According to the preparation method of the composite electrode provided by the invention, through discharge plasma sintering treatment, the ternary positive electrode material, the solid electrolyte and the conductive agent are tightly combined together in the case that own structures of the ternary positive electrode material, the solid electrolyte and the conductive agent are not damaged, and meanwhile, the interface problem between the electrode and the solid electrolyte in the lithium ion battery is solved; meanwhile, compared with the traditional hot pressing method and a pressureless sintering method, in the preparation method disclosed by the invention,sintering and hot pressing are carried out simultaneously, thereby greatly shortening the preparation time.

Description

technical field [0001] The invention relates to the field of energy storage, in particular to a preparation method of a composite electrode, a composite electrode and a lithium ion battery. Background technique [0002] Lithium metal batteries have attracted extensive attention due to their high energy density. Because the traditional electrolyte has safety problems such as flammability and leakage. Because of its own advantages of inhibiting lithium dendrites, good thermal stability, and good chemical stability, solid-state electrolytes are expected to replace liquid electrolytes and prepare next-generation all-solid-state lithium metal batteries. [0003] At present, there are problems such as large interface impedance and unstable interface between positive electrode materials and solid electrolytes. Contents of the invention [0004] In view of this, it is necessary to provide a preparation method that reduces the interfacial impedance between the positive electrode ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M4/62H01M4/131H01M4/1391H01M10/0525
CPCH01M4/131H01M4/1391H01M4/362H01M4/485H01M4/505H01M4/525H01M4/62H01M10/0525Y02E60/10
Inventor 贺艳兵沈璐毛敏夏和颐马家宾陈立坤康飞宇
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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