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Positive electrode material, and electrochemical device and electronic device comprising same

A cathode material and electrochemical technology, which is applied in the field of electrochemical devices and electronic devices, can solve the problems of reducing energy density, increasing the specific surface area of ​​primary grain size of material particles, and deteriorating the dynamic performance of materials.

Active Publication Date: 2022-07-22
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above measures will seriously deteriorate the high-temperature cycle life of the material under high voltage while improving the dynamic performance, resulting in a lower upper limit voltage and lower energy density.
Effective measures to improve the cycle life of positive electrode materials under high voltage include increasing the primary grain size of the material particles, reducing the specific surface area of ​​the material, doping the bulk phase and the surface of the material, and coating the surface with metal oxides, but these measures will deteriorate the kinetic energy of the material. reduce the material's first charge and discharge efficiency and reversible discharge capacity
Therefore, it is difficult to balance the improvement of kinetic performance and high-temperature cycle life in the prior art

Method used

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  • Positive electrode material, and electrochemical device and electronic device comprising same
  • Positive electrode material, and electrochemical device and electronic device comprising same
  • Positive electrode material, and electrochemical device and electronic device comprising same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0099] 1. Preparation of cathode materials

[0100] (1) Mix nickel sulfate, cobalt sulfate and manganese sulfate into deionized water to prepare a mixed salt solution, add sodium hydroxide to deionized water to prepare an alkaline solution, select ammonia water as a complexing agent, and then mix the salt solution and alkaline solution. Add the complexing agent into the reaction kettle, and add aluminum sulfate and titanium sulfate solution for reaction. The reaction temperature was controlled to be 25° C. and the pH was 11. When the particle size Dv50 reached a predetermined value of 4.5 μm, the reaction slurry was filtered, washed and dried to obtain the precursor. In the precursor co-precipitation reaction, aluminum sulfate solution and titanium sulfate solution are added to uniformly disperse the doping elements in the precursor matrix. In this example, the Ni / Co / Mn / Al / The molar ratio of Ti is 0.5:0.02:0.465:0.01:0.005.

[0101] (2) The lithium source Li 2 CO 3 It is ...

Embodiment 2

[0114] The difference compared with Example 1 is only in the following aspects of the preparation steps of the positive electrode material:

[0115] In step (1), the molar ratio of Ni / Co / Mn / Al / Ti in the doped hydroxide precursor component is 0.5:0.1:0.385:0.01:0.005;

[0116] In step (2), the primary sintering temperature is 945°C;

[0117] The cathode material matrix in step (3) is LiNi 0.5 Co 0.1 Mn 0.385 Al 0.01 Ti 0.005 O 2 , primary sintering material and coating additive nano-Co(OH) 2 and Al 2 O 3 The mass ratio of Co element is 100:29.1:2.1, the mole percentage W1 of Co element in the first cladding layer is 40.0%, and the mole percentage W2 of Co element in the matrix is ​​10%.

Embodiment 3

[0119] The difference compared with Example 1 is only in the following aspects of the preparation steps of the positive electrode material:

[0120] In step (1), the molar ratio of Ni / Co / Mn / Al / Ti in the doped hydroxide precursor component is 0.6:0.1:0.285:0.01:0.005;

[0121] In step (2), the primary sintering temperature is 935°C;

[0122] The cathode material matrix in step (3) is LiNi 0.6 Co 0.1 Mn 0.285 Al 0.01 Ti 0.005 O 2 , primary sintering material and coating additive nano-Co(OH) 2 and Al 2 O 3 The mass ratio of Co element is 100:29.0:2.1; the mole percentage W1 of Co element in the first cladding layer is 40.0%, and the mole percentage W2 of Co element in the matrix is ​​10.0%.

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Abstract

The invention relates to a positive electrode material, and an electrochemical device and an electronic device comprising the positive electrode material. The positive electrode material comprises a substrate and a first coating layer located on the surface of the substrate, wherein based on the molar weight of metal elements except Li in the first coating layer, the molar percentage content of Co in the first coating layer is W1, based on the molar weight of metal elements except Li in the matrix, the molar percentage content of Co in the matrix is W2, and W1gt, W2gt, W2gt and W2gt are satisfied. W2; the first cladding layer includes a first region having a spinel phase structure.

Description

technical field [0001] The present application relates to the field of energy storage, and in particular, to a positive electrode material and electrochemical devices and electronic devices comprising the positive electrode material. Background technique [0002] In recent years, the rapid development of the power tool and UAV equipment market has put forward higher requirements for the power density, low temperature performance, high rate discharge temperature rise, high temperature cycle life and other performance of power lithium-ion batteries. Key issues that the industry needs to address urgently. [0003] Studies have shown that the key to improving the power density of lithium-ion batteries, improving the low-temperature performance and high-rate discharge temperature rise of lithium-ion batteries is to reduce the internal resistance of the battery (including ohmic impedance, electrochemical polarization impedance and concentration polarization impedance), improve ...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/505H01M4/525H01M10/0525
CPCH01M4/525H01M4/505H01M10/0525H01M4/366H01M4/485Y02E60/10
Inventor 彭刚郎野刘文元
Owner NINGDE AMPEREX TECH
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