Special high-specific-capacity high-nickel positive electrode material for solid-state battery and preparation method thereof

A cathode material and high specific capacity technology, which is applied in the field of high specific capacity and high nickel cathode materials for solid-state batteries and their preparation. It can solve the problem of design materials without solid-state battery characteristics, unsatisfactory performance of cathode materials, and less research on solid-state lithium-ion batteries. The problem is to reduce the washing time and the residual low-alkaline impurities on the surface, overcome the interfacial force of the solid phase, and reduce the processing difficulty.

Active Publication Date: 2021-04-20
TIANJIN B&M SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the solid phase of the electrolyte in solid-state batteries, there will be problems such as poor contact, high impedance, and low charging efficiency at the solid-solid interface between the electrode material and the electrolyte. The performance of traditional positive electrode materials in solid-state batteries is not satisfactory.
[0005] However, there are still few researches on positive electrode materials for solid-state lithium-ion batteries. People still use traditional positive-electrode materials or simply coated ones in solid-state lithium-ion batteries.
Chinese patent CN 112002902 A uses a ternary material double-coated with a fast ion conductor and a conductive polymer in a solid-state battery; CN 112002898A is a ternary positive electrode material coated with lithium titanium lanthanum phosphate and modified in a solid-state battery. In essence, it is still a ternary material coated with traditional fast ion conductors, and there is no material designed for the characteristics of solid-state batteries.

Method used

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  • Special high-specific-capacity high-nickel positive electrode material for solid-state battery and preparation method thereof
  • Special high-specific-capacity high-nickel positive electrode material for solid-state battery and preparation method thereof
  • Special high-specific-capacity high-nickel positive electrode material for solid-state battery and preparation method thereof

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preparation example Construction

[0036] A method for preparing a high-specific-capacity high-nickel positive electrode material for solid-state batteries, characterized in that it comprises the following steps:

[0037] 1) Ni x co y mn 1-x-y (OH) 2 Precursor, M a o b The oxide and lithium source are mixed according to a certain ratio and then added to a high-speed mixer. The speed of the high-speed mixer is 300-1000 rpm, and the mixing time is 30-60 minutes. After mixing, a mixture A is formed; wherein, 0.80≤x ≤0.98, 0.02≤y≤0.2, and 1-x-y>0, said M is one or more of Ti, Al, Mg, Zr, V, Sr, Ba;

[0038] 2) Place the mixture A in an oxygen atmosphere for the first step of calcination, first perform low-temperature calcination below 500°C, then raise the temperature to above 700°C for high-temperature calcination; then switch the atmosphere in the furnace to ammonia for etching Roasting, crushing and sieving to obtain mixture B;

[0039] 3) Mix mixture B and deionized water according to the mass ratio of 1:5...

Embodiment 1

[0056] 1) Weigh 1kg of Ni 0.96 co 0.02 mn 0.02 (OH) 2 The precursor, 5g of titanium dioxide, and 500g of LiOH were mixed in a high-speed mixer at a speed of 1000 rpm for 45 minutes to form a mixed material A;

[0057] 2) Put the mixed material A in an atmosphere furnace for heat treatment, the roasting atmosphere is oxygen, treat at a low temperature of 400°C for 6 hours, then raise the temperature to 800°C, and after the treatment time is 15 hours, switch the roasting atmosphere in the atmosphere furnace to Ammonia, after roasting at 700°C for 2 hours, material B was obtained;

[0058] 3) Crushing and sieving the material B obtained in step 2), taking 500g of the sieved material and 5000g of pure water at a temperature of 40°C, stirring for 30 minutes and then filtering, and putting the filtered material into an oven at 100°C Material C was obtained after drying at ℃ for 4 hours;

[0059] 4) Take 400g of material C, add 2g of aluminum oxide and place it in an atmosphere ...

Embodiment 2

[0067] 1) Weigh 1kg of Ni 0.96 co 0.02 mn 0.02 (OH) 2 The precursor, 4g magnesium oxide, and 500g lithium carbonate were mixed in a high-speed mixer at a speed of 1000 rpm for 60 minutes to form a mixed material A;

[0068] 2) Put the mixed material A in an atmosphere furnace for heat treatment, the roasting atmosphere is oxygen, treat at a low temperature of 300°C for 5 hours, then raise the temperature to 800°C, and after the treatment time is 15 hours, switch the roasting atmosphere in the atmosphere furnace to Ammonia gas, after roasting at 800°C for 1 hour, material B was obtained;

[0069] 3) Crushing and sieving the material B obtained in step 2), taking 500g of the sieved material and 5000g of pure water at a temperature of 40°C, stirring for 30 minutes and then filtering, and putting the filtered material into an oven at 120 Material C was obtained after drying at ℃ for 4 hours;

[0070] 4) Take 400g of material C, add 2.5g of zirconia and place it in an atmosphe...

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Abstract

The invention relates to a preparation method of a special high-specific-capacity high-nickel positive electrode material for a solid-state battery. The method mainly comprises the following steps: mixing a NixCoyMn1-x-y(OH)2 precursor, metal oxide and a lithium source according to a certain ratio, putting the mixed material into an oxygen furnace for heat treatment, treating at a low temperature for a period of time, heating to a high temperature, and introducing oxygen; then introducing an ammonia gas for treatment for a period of time, then mixing the material subjected to heat treatment with pure water with a higher temperature, stirring for a period of time, draining water, and putting into a drying oven for drying; and finally, mixing the dried material with another oxide according to a certain ratio, introducing oxygen, and introducing the ammonia gas for secondary roasting coating. According to the method, tiny apertures can be etched on the surface of the material, alkaline impurity residues are reduced, first discharge efficiency and a cycle retention rate of the material are improved, and the method is more suitable for actual working conditions of a solid electrolyte.

Description

technical field [0001] The invention relates to the field of lithium-ion battery materials, in particular to a high-specific-capacity and high-nickel positive electrode material for solid-state batteries and a preparation method thereof. Background technique [0002] In future applications, medium and large lithium-ion batteries have great potential. High nickel ternary cathode material LiNiO 2 ,LiCoO 2 and LiMnO 2 The advantages of the three materials are integrated into one, with high energy density, good thermal stability and electrochemical stability, and low cost. It is a kind of positive electrode material for lithium-ion batteries with good prospects. [0003] However, liquid electrolytes are widely used in traditional lithium-ion batteries. Liquid electrolytes are flammable and explosive. During the charging process, the growth of lithium dendrites can easily pierce the separator, causing short circuits in the battery and causing safety hazards. In addition, if h...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/525H01M4/505H01M10/0525C01G25/02C01F7/02C01G53/00C01F7/00C01G25/00
CPCY02E60/10
Inventor 张玉伟吕菲徐宁赵晓童侯宾陈瑞达吴孟涛
Owner TIANJIN B&M SCI & TECH
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