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Positive electrode active material for lithium secondary battery and lithium secondary battery including the same

A cathode active material, lithium secondary battery technology, used in secondary batteries, lithium storage batteries, battery electrodes, etc., can solve the problems of power and life performance decline, performance improvement effect is small, etc., to improve capacity, easy storage and the effect of

Active Publication Date: 2021-04-30
ECOPRO BM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, the interface between the inner layer and the outer layer acts as a resistance during long-term use, which may reduce power and life performance, and at a higher heat treatment temperature above 850°C, due to thermal diffusion of metal ions There is almost no concentration gradient difference, so the performance improvement effect is small

Method used

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  • Positive electrode active material for lithium secondary battery and lithium secondary battery including the same
  • Positive electrode active material for lithium secondary battery and lithium secondary battery including the same
  • Positive electrode active material for lithium secondary battery and lithium secondary battery including the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0057] Prepare the positive electrode according to the same method as in Example 1, except that the composition of the core layer is Li(Ni 0.97 co 0.03 )O 2 , the composition of the shell is Li(Ni 0.5 co 0.2 mn 0.3 )O 2 , the concentration gradient layer from Li(Ni 0.97 co 0.03 )O 2 to Li(Ni 0.5 co 0.2 mn 0.3 )O 2 It has a continuous constant concentration gradient.

Embodiment 3

[0059] Prepare the positive electrode according to the same method as in Example 1, except that the composition of the core layer is Li(Ni 0.97 co 0.03 )O 2 , the composition of the shell is Li(Ni 0.4 co 0.2 mn 0.2 )O 2 , the concentration gradient layer from Li(Ni 0.97 co 0.03 )O 2 to Li(Ni 0.4 co 0.2 mn 0.2 )O 2 It has a continuous constant concentration gradient.

Embodiment 4

[0061] Prepare the positive electrode according to the same method as in Example 1, except that the composition of the core layer is Li(Ni 0.90 co 0.10 )O 2 , the composition of the shell is Li(Ni 0.5 mn 0.5 )O 2 , the concentration gradient layer from Li(Ni 0.90 co 0.10 )O 2 to Li(Ni 0.5 mn 0.5 )O 2 It has a continuous constant concentration gradient.

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Abstract

The present invention relates to a positive electrode active material for a lithium secondary battery and a lithium secondary battery containing the same, in more detail, to a positive electrode active material characterized in that it has a layered structure (Layered structure) on the outer surface of its core layer Concentration gradient layer and shell layer with thickness adjustment are included on the surface, and the lithium ion diffusion path (lithium ion diffusion path) in the primary particle and the secondary particle is formed in a directional manner in a specific direction. The positive electrode activity for lithium secondary batteries Material and lithium secondary battery containing same.

Description

technical field [0001] The present invention relates to a positive electrode active material for a lithium secondary battery and a lithium secondary battery containing the same, and in more detail, to a positive electrode active material characterized in that it has a layered structure including a thickness adjustment on the outer surface of its core layer A positive electrode active material for a lithium secondary battery and a lithium secondary battery comprising the concentration gradient layer and the shell layer, and the lithium ion diffusion paths in the primary particles and in the secondary particles are formed in a directional manner in a specific direction. Background technique [0002] Recently, interest in energy storage technologies has increased. Batteries have been widely used as energy sources in the fields of mobile phones, video cameras, notebook PCs, and electric vehicles, leading to intensive research and development of electrochemical devices. In this ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/525H01M4/505H01M10/052C01G53/00
CPCC01G53/42C01G53/50C01P2002/85C01P2004/03C01P2004/04C01P2004/84C01G53/006Y02E60/10H01M4/366H01M10/0525H01M4/1315H01M4/131H01M4/136H01M4/5825H01M4/582H01M4/525H01M4/505H01M2004/028H01M2004/021H01M2220/30H01M2220/20
Inventor 金直洙崔文豪尹振暻郑宰溶田石用辛锺承
Owner ECOPRO BM CO LTD