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A kind of high-voltage composite spinel-coated cathode material and preparation method thereof

A positive electrode material and spinel technology, applied in the field of high-voltage composite spinel-coated positive electrode material and its preparation, can solve the problems of poor cycle performance, low discharge capacity, instability, etc., and achieve obvious redox activity , reduce side reactions, reduce the effect of corrosion

Active Publication Date: 2022-03-18
TIANMU LAKE INST OF ADVANCED ENERGY STORAGE TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0022] In view of this, the present invention aims to propose a high-voltage composite spinel-coated positive electrode material and its preparation method. The surface is provided with a composite coating layer. The coating layer has good lithium ion conductivity and does not affect the In the case of a discharge platform, the positive electrode material has a high discharge capacity and excellent cycle life at high voltage, improves the volumetric energy density of the lithium-ion battery, reduces the corrosion of the surface layer of the material by HF, and improves the high-temperature cycle life of the material, thereby overcoming The positive electrode materials in the prior art are structurally unstable when used at a high charge cut-off voltage, or even if the structure is stable, the cycle performance is not good and the discharge capacity is not high enough, and the high temperature cycle performance is improved, which is more suitable for the actual use of the material Condition

Method used

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  • A kind of high-voltage composite spinel-coated cathode material and preparation method thereof
  • A kind of high-voltage composite spinel-coated cathode material and preparation method thereof
  • A kind of high-voltage composite spinel-coated cathode material and preparation method thereof

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Embodiment 1

[0063] The positive electrode material provided in this embodiment is Li with a core particle size of about 14.0 μm, a middle layer thickness of about 1.0 μm, and a surface cladding layer thickness of about 0.1 μm. 0.99 Co 0.99 Mg 0.01 O 1.98 F 0.02 / Li 1.05 Ni 0.5 Mn 1.45 Al 0.05 O 4 Cathode material for / LATP. Among them, Li 0.99 Co 0.99 Mg 0.01 O 1.98 F 0.02 / Li 1.05 Ni 0.5 Mn 1.45 Al 0.05 O 4 / LATP means Li 0.99 Co 0.99 Mg 0.01 O 1.98 F 0.02 as the core, Li 1.05 Ni 0.5 Mn 1.45 Al 0.05 O 4 It is a cathode material with a middle layer and a surface layer coated with nano-LATP materials. Its SEM image is shown in Figure 4 , see TEM image Figure 5 , see XRD Image 6 . The SEM image shows that the surface of the material obtained by direct sintering is not very smooth and round due to the presence of lithium nickel manganate. The TEM image shows that the coating thickness on the surface of the material is uniform, and the different observation ...

Embodiment 2

[0070] The MgF in step 1 in Example 1 was 2 Change to Al 2 O 3 , M Co :M Mg =M Co :M Al , Al(NO in step 2 3 ) 3 Change to Mg(NO 3 ) 2 , other steps are the same to obtain the positive electrode material of this example, see XRD Image 6 .

Embodiment 3

[0072] The MgF in step 1 in Example 1 was 2 Change to AlF 3 , M Co :M Mg =M Co :M Al , Al(NO in step 2 3 ) 3 Change to V(NO 3 ) 2 , the LATP in step 4 is changed to LLZO, and other steps are the same to obtain the positive electrode material of this embodiment.

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Abstract

The invention provides a high-voltage composite spinel-coated positive electrode material and a preparation method thereof. The positive electrode material comprises a lithium cobalt oxide inner core, a spinel-type lithium nickel manganese oxide middle layer, and a solid electrolyte surface layer. The invention provides a positive electrode material with a composite coating layer on the surface. The coating layer has good lithium ion conductivity, and without affecting the discharge platform, the positive electrode material has a high discharge capacity under high voltage and a long cycle life. Excellent service life, improve the volume energy density of lithium-ion batteries, reduce the corrosion of HF on the surface of the material, improve the high-temperature cycle life of the material, and overcome the structural instability of the positive electrode material in the prior art under high charge cut-off voltage , or even if the structure is stable, but the cycle performance is not good, the discharge capacity is not high enough, and the high temperature cycle performance is improved, which is more in line with the actual use conditions of the material.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, in particular to a high-voltage composite spinel-coated positive electrode material and a preparation method thereof. Background technique [0002] In the 1870s, M.S. Whittingham (one of the 2019 Nobel Laureates in Chemistry) worked for Exxon in the United States. He developed the prototype of lithium-ion batteries: TiS 2 A secondary battery based on Li-ion intercalation reaction with Li-Al alloy as the positive electrode and Li-Al alloy as the negative electrode. Due to the energy density of the system and safety issues, TiS 2 The commercialization of the battery was not successful, but this new battery working principle proposed by Whittingham - intercalation reaction, undoubtedly became the cornerstone of the successful commercialization of SONY lithium-ion batteries later. [0003] In 1980, Professor J.B. Goodenough of the Department of Inorganic Chemistry at Oxford University (one of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525H01M10/42
CPCH01M4/366H01M4/525H01M4/505H01M4/628H01M10/4235H01M10/0525H01M2004/028H01M2004/021Y02E60/10
Inventor 周子龙许国干吕焱刘园园任瑜郑杰允李立飞
Owner TIANMU LAKE INST OF ADVANCED ENERGY STORAGE TECH CO LTD