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A kind of preparation method of high rate and high nickel composite positive electrode and its application

A composite cathode, high-rate technology, used in positive electrodes, battery electrodes, active material electrodes, etc., can solve problems such as limited transmission capacity, improve lithium ion conductivity, reduce lithium ion transmission paths, and reduce secondary particles. effect of diameter

Active Publication Date: 2022-07-19
WANXIANG 123 CO LTD
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the problem of limited electron transmission capacity in the positive electrode in the prior art, and provide a preparation method and application of a high-magnification high-nickel composite positive electrode sheet. The present invention optimizes high-nickel by adding hollow nano-carbon conductive agent HNC The ratio of the active material to the solid electrolyte material is reduced, and the secondary particle size of the high-nickel active material coated on the surface is reduced. At the same time, the electronic conductivity and ion conductivity of the high-nickel composite positive electrode sheet are improved, the internal resistance of the battery is reduced, and the overall battery life is significantly improved. Rate discharge performance of solid-state batteries

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  • A kind of preparation method of high rate and high nickel composite positive electrode and its application

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[0028] A preparation method of a high-rate and high-nickel composite positive electrode sheet, comprising the following preparation steps:

[0029] a. Preparation of hollow nano-carbon conductive agent HNC: Fe 3 O 4 The nanopowder is placed in a closed container. First, hydrogen is introduced at a rate of 0.1-0.3L / min, and the temperature is raised to 500-600°C at a rate of 4-6°C / min. The carbon dioxide was introduced at a rate of 0.5-1.2L / min for 7-20min and then stopped, the airtight container was kept for 3-6h, cooled to room temperature, the obtained powder was stirred in concentrated acid (concentrated hydrochloric acid or concentrated nitric acid) for 2.5-3h, filtered The powder is washed and placed in an argon atmosphere, heated to 2000-2500°C for 60-180min at 5-10°C / min, and sintered for 60-180min to obtain a highly graphitized hollow nano-carbon conductive agent HNC with low surface defects; Fe 3 O 4 The ratio of nano powder to the total amount of hydrogen introduc...

Embodiment 1

[0034] A preparation method of a high-rate and high-nickel composite positive electrode sheet, comprising the following preparation steps:

[0035] a. Preparation of hollow nano-carbon conductive agent HNC: Fe 3 O 4 The nanopowder was placed in a closed container. First, hydrogen was introduced at a rate of 0.2L / min, and the temperature was raised to 550°C at a rate of 5°C / min. After passing carbon dioxide for 15 min, it was stopped, the airtight container was kept for 4.5 h, cooled to room temperature, the obtained powder was stirred in concentrated hydrochloric acid for 2.8 h, the powder was filtered and washed, the powder was placed in an argon atmosphere, and the temperature was increased at 8 °C / min. Sintered at 2250 °C for 120 min to obtain highly graphitized hollow nano-carbon conductive agent HNC with low surface defects; Fe 3 O 4 The ratio of nano powder to the total amount of hydrogen introduced is 0.12:110;

[0036] b. Preparation of nano-Li 2 ZrO 3 Coating hi...

Embodiment 2

[0041] A preparation method of a high-rate and high-nickel composite positive electrode sheet, comprising the following preparation steps:

[0042] a. Preparation of hollow nano-carbon conductive agent HNC: Fe 3 O 4 The nanopowder was placed in a closed container. First, hydrogen was introduced at a rate of 0.1L / min, and the temperature was raised to 500°C at a rate of 4°C / min. After adding carbon dioxide for 7 min, stop, keep the airtight container for 3 h, cool to room temperature, stir the obtained powder in concentrated hydrochloric acid for 2.5 h, filter the powder and wash it, put the powder in an argon atmosphere, and heat up to 2000 at 5°C / min Sintered at ℃ for 60 min to obtain highly graphitized hollow nano-carbon conductive agent HNC with low surface defects; Fe 3 O 4 The ratio of nano-powder to the total amount of hydrogen introduced is 0.05:100;

[0043] b. Preparation of nano-Li 2 ZrO 3 Coating high-nickel cathode material: ZrO (NO 3 ) 2H 2 O, LiNO 3 and ...

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Abstract

The invention relates to the technical field of lithium ion batteries. In view of the problem of limited electron transport capability in the positive electrode in the prior art, a preparation method and application of a high-rate and high-nickel composite positive electrode sheet are disclosed, including the following preparation steps: preparing a hollow nanometer Carbon conductive agent HNC; preparation of nano-Li with secondary particle size ≤10μm 2 ZrO 3 Coating high nickel cathode material; nano Li 2 ZrO 3 The high-nickel positive electrode material and the garnet-type lithium lanthanum zirconate LLZO solid electrolyte particles are covered by vibration ball milling, and the hollow nano-carbon conductive agent HNC is added, ball-milled and mixed, and molded and pressed to obtain a high-nickel composite positive electrode sheet. The invention optimizes the ratio of high-nickel active material and solid electrolyte material by adding hollow nano-carbon conductive agent HNC, reduces the secondary particle size of the high-nickel active material coated on the surface, and improves the electronic conductivity of the high-nickel composite positive electrode sheet. The ionic conductivity reduces the internal resistance of the battery and significantly improves the rate discharge performance of the all-solid-state battery.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a preparation method and application of a high-rate and high-nickel composite positive electrode sheet. Background technique [0002] Lithium-ion batteries have the characteristics of high operating voltage, high mass specific capacity and high specific energy. In the past 25 years, the energy density of traditional liquid lithium-ion secondary batteries has increased by 4 times, but it is now close to the limit. For large-scale energy storage systems such as electric vehicles, more reliable and safe battery systems are required. Solid-state batteries (SSBs) are considered as The most promising next-generation power battery technology. However, in all-solid-state batteries, solid electrolytes with specific microstructure and grain distribution may not be in contact with all active materials. There must be good electron percolation to transport the electrons to the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/1391H01M4/36H01M4/525H01M4/62H01M10/0525H01M10/0562
CPCH01M4/1391H01M4/366H01M4/525H01M4/625H01M10/0525H01M10/0562H01M2004/028Y02E60/10
Inventor 宫娇娇陈军黄建根郑利峰
Owner WANXIANG 123 CO LTD
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