Lithium zirconium titanium phosphate modified lithium-rich material and preparation method thereof

A technology of lithium titanium zirconium phosphate and lithium-rich materials, applied in active material electrodes, electrical components, electrochemical generators, etc., can solve the problems of short cycle times and poor electrochemical performance, and achieve less environmental pollution and better The effect of high rate discharge performance and good cycle stability

Pending Publication Date: 2021-05-14
CENT SOUTH UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the discharge capacity of the obtained material at 0.1C rate is only 173

Method used

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  • Lithium zirconium titanium phosphate modified lithium-rich material and preparation method thereof
  • Lithium zirconium titanium phosphate modified lithium-rich material and preparation method thereof
  • Lithium zirconium titanium phosphate modified lithium-rich material and preparation method thereof

Examples

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Example Embodiment

[0043] Example 1

[0044]A lithium titanium zirconium phosphate modified lithium-rich material: the chemical formula of the composite mLi[Li 0.4 Ni 0.16 Co 0.16 Mn 0.495 Zr 0.175 ]O 2 ·nLiTi 0.25 Zr 1.75 (PO 4 ) 3 , n / (m+n)=0.01, the mass percentage of the lithium titanium zirconium phosphate is 1 wt %, and the lithium titanium zirconium phosphate forms a uniform coating layer with a thickness of 10 nm in an amorphous state; the positive electrode material is a particle Secondary spherical particles with a diameter of 6 to 10 μm.

[0045] like figure 1 As shown, the thickness of the titanium zirconium lithium phosphate coating layer on the surface of the positive electrode composite material obtained in Example 1 of the present invention is 10 nm.

[0046] like figure 2 As shown, the positive electrode composite material obtained in the example of the invention contains lithium titanium zirconium phosphate and is a pure phase.

[0047] like Figure 5 As shown, t...

Example Embodiment

[0051] Example 2

[0052] A lithium titanium zirconium phosphate modified lithium-rich material: the chemical formula of the composite is mLi[Li 0.4 Ni 0.16 Co 0.16 Mn 0.48 Zr 0.19 ]O 2 ·nLiTi 0.1 Zr 1.9 (PO 4 ) 3 , n / (m+n)=0.015, the mass percentage of the lithium titanium zirconium phosphate is 1.5wt%, and the lithium titanium zirconium phosphate forms a uniform coating layer in an amorphous state; the positive electrode material is a particle size of 6 ~10 μm secondary spherical particles.

[0053] After testing, the lithium-titanium zirconium phosphate modified lithium-rich material obtained in the embodiment of the present invention contains lithium titanium zirconium phosphate and is a pure phase.

[0054] After testing, the lithium titanium zirconium phosphate modified lithium-rich material obtained in the embodiment of the present invention is a secondary spherical particle with a particle size of 6-10 μm, and the surface has a coating layer formed by the lit...

Example Embodiment

[0059] Example 3

[0060] A lithium titanium zirconium phosphate modified lithium-rich material: the chemical formula of the composite is mLi[Li 0.4 Ni 0.16 Co 0.16 Mn 0.49 Zr 0.18 ]O 2 ·nLiTi 0.2 Zr 1.8 (PO 4 ) 3 , n / (m+n)=0.005, the mass percentage of the lithium titanium zirconium phosphate is 0.5wt%, and the lithium titanium zirconium phosphate forms a uniform coating layer in an amorphous state; the positive electrode material is a particle size of 6 Secondary spherical particles of ~10 μm, lithium titanium zirconium phosphate form a uniform coating layer with a thickness of 8 nm in an amorphous state.

[0061] After testing, the lithium titanium zirconium phosphate modified lithium-rich material obtained in the embodiment of the present invention is a secondary spherical particle with a particle size of 6-10 μm, and the surface has a coating layer formed by the lithium titanium zirconium phosphate in an amorphous state.

[0062] After testing, the thickness of ...

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Abstract

The invention discloses a titanium zirconium lithium phosphate modified lithium-rich material and a preparation method thereof. An mLi[Li0.4Ni0.16Co0.16MnxZr0.1q]O2.nLiTiwZrq(PO4)3 composite material is synthesized, the mass percentage content of titanium zirconium lithium phosphate in the material is 0.5-5wt%, and the thickness is 5-20nm. The preparation method comprises the following steps: (1) dispersing a lithium source, a zirconium source and a phosphorus source into an organic solvent; (2) adding a titanium source and a lithium-rich material into a solution, and stirring to obtain black slurry;(3) performing vacuum drying to obtain a pre-sintered material; (4) grinding and sintering in an air atmosphere to obtain the composite material. The electrochemical performance, the rate capability and the cycle performance of the lithium ion battery made of the lithium-rich material are improved. According to a battery assembled by the material, the first discharge gram capacity reaches 255.3 mAh/g under 2.0-4.6 V and 0.1 C, the capacity is 224.9 mAh/g after 100 cycles under 1C, the capacity retention rate reaches 88.1%, and the performance is excellent under high rate. The method is simple, low in cost, less in environmental pollution and suitable for industrial production.

Description

technical field [0001] The invention relates to a positive electrode material of a lithium ion battery and a preparation method thereof, in particular to a lithium-rich material modified with lithium titanium zirconium phosphate and a preparation method thereof. Background technique [0002] Lithium-rich cathode material is a new type of cathode material for lithium-ion batteries that has developed rapidly in recent years. Among many cathode materials, lithium-rich materials with high capacity, low cost, and low toxicity have become a research hotspot, and are expected to be used as cathode materials in next-generation high-energy-specific lithium-ion batteries. However, this lithium-rich material has some inherent shortcomings, such as large first irreversible capacity, poor rate performance, and operating voltage decay during cycling, which all make lithium-rich materials suitable for applications. Lithium-ion cathode materials are limited. [0003] The modification of c...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M4/624H01M4/628H01M10/0525H01M2004/028Y02E60/10
Inventor 欧星刘赟范鑫铭张宝张佳峰
Owner CENT SOUTH UNIV
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