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A ternary material for lithium batteries coated with negative temperature coefficient material

A negative temperature coefficient, ternary material technology, applied in electrical components, battery electrodes, secondary batteries, etc., can solve the problems of insignificant improvement, side reactions, and deterioration of material cycle stability.

Active Publication Date: 2021-05-07
RISESUN MENGGULI NEW ENERGY SCIENCE & TECHNOLOGY CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ternary materials also have the phenomenon of self-discharge due to internal transfer of electrons with the electrolyte. At the same time, ternary materials have high activity at high temperatures and are prone to side reactions with electrolytes, resulting in poor material cycle stability.
Al is used in the prior art 2 o 3 Coating or coal ash coating, but the improvement of the above phenomena is not obvious

Method used

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  • A ternary material for lithium batteries coated with negative temperature coefficient material
  • A ternary material for lithium batteries coated with negative temperature coefficient material
  • A ternary material for lithium batteries coated with negative temperature coefficient material

Examples

Experimental program
Comparison scheme
Effect test

example 2

[0057] Molar ratio is Ni in the step (1) 2+ :Co 2+ :Mn 2+ =5:2:3. The rest are the same as in Reference Example 1.

[0058] Reference example 3

[0059] Molar ratio is Ni in the step (1) 2+ :Co 2+ :Mn 2+ =6:2:2. The rest are the same as in Reference Example 1.

example 4

[0061] Molar ratio is Ni in the step (1) 2+ :Co 2+ :Mn 2+ =8:1:1. The rest are the same as in Reference Example 1.

Embodiment 1

[0063] (1) Set the molar ratio to Ni 2+ :Co 2+ :Mn 2+ =3:3:3, Ni, Co, Mn sulfate mixed solution with a concentration of 0.5mol / L is pumped into the continuously stirred tank reactor, and 1mol / L NaOH solution and 0.5mol / L ammonia water are pumped simultaneously Thoroughly stir to obtain the first precursor;

[0064] (2) Put the first precursor in a high-pressure reactor and add 1mol / L LiOH aqueous solution, and keep it at 250°C for 36 hours to obtain the second precursor;

[0065] (3) Calcining the second precursor at a certain temperature for a period of time to obtain the ternary material LiNi x co y mn 1-x-y o 2 (0

[0066] (4) The ternary material LiNi x co y mn 1-x-y o 2 Mix with a solvent and put it into a high-pressure reactor, and at the same time add a certain concentration of Co, Mn, Ni and / or Al salt solution into the high-pressure reactor of the precursor II, and add a certain concentration of alkali solution and chelating agent to fully stir...

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Abstract

The invention belongs to the field of positive electrode materials for lithium batteries, and specifically relates to a ternary material for lithium batteries coated with negative temperature coefficient materials. salt mixed solution, add a certain concentration of the first alkali solution and the first chelating agent to fully stir, keep warm at a certain temperature for a certain period of time to obtain the first precursor; (2) disperse the first precursor into a certain concentration of lithium salt solution and Place it in a high-pressure reactor, keep it warm at a certain temperature for a certain period of time to obtain the second precursor; (3) calcinate the second precursor for the first time to obtain LiNi x co y mn 1‑x‑y o 2 ; (4) prepared to be coated with M 3 o 4 The ternary material of the precursor; (5) prepared to be coated with M 3 o 4 Ternary materials for lithium batteries with negative temperature coefficient materials. The ternary material coating provided by the invention has good uniformity, reduces self-discharge at normal temperature, and improves storage performance, cycle performance and rate performance at high temperature.

Description

technical field [0001] The invention belongs to the field of cathode materials for lithium batteries, in particular to a ternary material for lithium batteries coated with negative temperature coefficient materials. Background technique [0002] In recent years, with the continuous improvement of the capacity of lithium-ion batteries, NCM ternary materials have become a research boom. However, ternary materials also have the phenomenon of self-discharge caused by internal transfer of electrons with the electrolyte. At the same time, ternary materials have high activity at high temperatures and are prone to side reactions with the electrolyte, resulting in poor cycle stability of the material. Al is used in the prior art 2 o 3 Coating or coal ash coating, but the improvement of the above phenomenon is not obvious. [0003] In view of the above problems, this paper chooses M 3 o 4 Type NTC thermosensitive material, the ternary material is coated by hydrothermal synthesis ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/628H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 冯全玉刘建红高云张宏阳王兴勤杨溢
Owner RISESUN MENGGULI NEW ENERGY SCIENCE & TECHNOLOGY CO LTD
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