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Metal phosphide and metal phosphate composite modified ternary positive electrode material precursor

A technology of metal phosphate and metal phosphide, which is applied in the direction of phosphide, phosphorus compound, non-metallic elements, etc., can solve the problems of poor electrical conductivity, achieve low cost, improve structural stability and rate performance, and be easy to realize Effect

Active Publication Date: 2021-11-26
ZHUJI PAWA NEW ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But monometallic phosphates, such as AlPO 4 ,Co 3 (PO 4 ) 2 The problem of poor electrical conductivity of the cladding material needs to be solved urgently

Method used

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  • Metal phosphide and metal phosphate composite modified ternary positive electrode material precursor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] In this example, metal phosphide and metal phosphate compound modified ternary cathode material precursor is ZnP 2 and ZnMn 2 (PO 4 ) 2 Composite Modified Ni 0.5 co 0.2 mn 0.3 O ternary cathode material precursor, the chemical formula can be written as: ZnP 2 / ZnMn 2 (PO 4 ) 2 @Ni 0.5 co 0.2 mn 0.3 O.

[0032] The preparation method of the composite modified ternary precursor of metal phosphide and metal phosphate in this example is as follows:

[0033] Take 0.1mol ternary cathode material precursor Ni 0.5 co 0.2 mn 0.3 (OH) 2 Disperse in 20 mL of water, add 2 mmol Zn(NO 3 ) 2 and 2 mmol Mn(NO 3 ) 2 After dissolving, add 2 mmol diammonium hydrogen phosphate and 0.05 g complexing agent PVP, stir at 30°C for 5 hours, filter, dry, and calcinate at 700°C for 4 hours under nitrogen atmosphere to obtain metal phosphide and metal phosphate compound Modified ternary precursor ZnP 2 / ZnMn 2 (PO 4 ) 2 @Ni 0.5 co 0.2 mn 0.3 O.

[0034] The ternary cath...

Embodiment 2

[0053] In this example, metal phosphide and metal phosphate compound modified ternary cathode material precursor is ZnP 2 and Zn 2 Co(PO 4 ) 2 Composite Modified Ni 0.5 co 0.2 mn 0.3 O ternary cathode material precursor, the chemical formula can be written as: ZnP 2 / Zn 2 Co(PO 4 ) 2 @Ni 0.5 co 0.2 mn 0.3 O.

[0054] The preparation method of the composite modified ternary precursor of metal phosphide and metal phosphate in this example is as follows:

[0055] Take 0.1mol ternary cathode material precursor Ni 0.5 co 0.2 mn 0.3 (OH) 2 Disperse in 20 mL of water, add 2.5 mmol Zn(NO 3 ) 2 and 1 mmol Co(NO 3 ) 2 After dissolving, add 2 mmol of diammonium hydrogen phosphate and 0.05 g of complexing agent PVP, stir at 30°C for 5 hours, filter, dry, and calcinate at 700°C for 4 hours under nitrogen atmosphere to obtain metal phosphide and metal phosphate compound modification Sexual ternary precursor ZnP 2 / Zn 2 Co(PO 4 ) 2 @Ni 0.5 co 0.2 mn 0.3 O.

[005...

Embodiment 3

[0061] In this example, the precursor of the metal phosphide and metal phosphate composite modified ternary positive electrode material is Ca 3 P 2 and Ca 2 Co(PO 4 ) 2 Composite Modified Ni 0.6 co 0.2 mn 0.2 O ternary cathode material precursor, the chemical formula can be written as: Ca 3 P 2 / Ca 2 Co(PO 4 ) 2 @Ni 0.6 co 0.2 mn 0.2 O.

[0062] The preparation method of the composite modified ternary precursor of metal phosphide and metal phosphate in this example is as follows:

[0063] Take 0.1mol ternary cathode material precursor Ni 0.6 co 0.2 mn 0.2 (OH) 2 Disperse in 20 mL of water, add 2.5 mmol Ca(NO 3 ) 2 and 1 mmol Co(NO 3 ) 2 After dissolving, add 2 mmol diammonium hydrogen phosphate and 0.05 g complexing agent PVP, stir at 30°C for 5 hours, filter, dry, and calcinate at 750°C for 6 hours under nitrogen atmosphere to obtain metal phosphide and metal phosphate compound modification sex ternary precursor Ca 3 P 2 / Ca 2 Co(PO 4 ) 2 @Ni 0.6 ...

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Abstract

The invention relates to a metal phosphide and metal phosphate composite modified ternary positive electrode material precursor. The chemical general formula of the metal phosphate is MmN3-m(PO4)2, the chemical general formula of the metal phosphide is MnP2, M is a metal element Zn and / or Ca, and m is more than 0 and less than 3; N is one or more than two of metal elements Ni, Co and Mn; and 1< / =n< / =3. According to the metal phosphide and metal phosphate composite modified ternary positive electrode material precursor disclosed by the invention, the structural stability and rate capability of the ternary positive electrode material are improved, and meanwhile, the metal phosphide and metal phosphate composite modified ternary positive electrode material precursor has the advantages of low cost and easiness in implementation.

Description

technical field [0001] The invention relates to a modified ternary cathode material precursor, in particular to a metal phosphide and metal phosphate modified ternary cathode material precursor. Background technique [0002] As the most potential secondary power source at present, lithium-ion batteries are widely used in our daily life. At present, ternary cathode materials are the most widely used in lithium-ion battery materials due to their high energy density and high stability. However, ternary cathode materials, especially high-nickel materials, are prone to cation mixing, which makes the electrochemical performance of the material decline. Therefore, it is necessary to modify the ternary precursor to stabilize the structure of the precursor to weaken the Li + / Ni 2+ The occurrence of cation mixing improves the overall performance of the ternary cathode material. [0003] Phosphate due to the PO 4 The combination of covalent bonds and metal ions can improve the th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00C01B25/45C01B25/08H01M4/505H01M4/525H01M10/0525
CPCC01G53/006C01B25/45C01B25/08H01M4/505H01M4/525H01M10/0525C01P2004/03C01P2004/80C01P2006/40Y02E60/10
Inventor 张宝邓鹏程诚林可博周亚楠丁瑶
Owner ZHUJI PAWA NEW ENERGY
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