A method of chemical vapor deposition coated carbon and the prepared coated high-voltage ternary material

A technology of chemical vapor deposition and ternary materials, which is applied in the field of cathode materials for lithium-ion secondary batteries, can solve the problems of easy aggregation of carbon source precursors, uneven coating of roasted products, and influence on the performance of cathode materials, so as to achieve a uniform improvement properties and compactness, reducing residual lithium content, and improving processability

Active Publication Date: 2022-03-18
TIANJIN B&M SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art CN 108963239A, a positive electrode material of nickel-cobalt-lithium-manganese oxide coated with titanium dioxide was prepared by vapor deposition, but as titanium dioxide is a semiconductor, the separate coating will affect the specific capacity of the material; in the prior art CN106058220B, the vapor deposition method was also used to prepare Titanium nitride and carbon double-coated cathode material, but it adopts the traditional solid-phase carbon source roasting method to form a carbon layer. The carbon source precursor is prone to aggregation at high temperature, and the roasted product also has uneven coating. In addition, at high temperature, carbon will undergo a reduction reaction with metal ions in the positive electrode material, which will cause some metal segregation in the material and affect the performance of the positive electrode material.

Method used

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  • A method of chemical vapor deposition coated carbon and the prepared coated high-voltage ternary material
  • A method of chemical vapor deposition coated carbon and the prepared coated high-voltage ternary material
  • A method of chemical vapor deposition coated carbon and the prepared coated high-voltage ternary material

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Embodiment 1

[0035] A method for preparing a gas-phase coated high-voltage ternary material, comprising the steps of:

[0036] 1) According to the molecular formula Li 1.03 Ni 0.5 co 0.2 mn 0.3 o 2 , weigh lithium carbonate, Ni 0.5 co 0.2 mn 0.3 (OH) 2 The precursor is added to a high-speed mixer and mixed evenly to obtain a mixture I;

[0037] 2) Put the mixture I into a vapor deposition furnace for high-temperature calcination, the rotation speed of the furnace body is 1 revolution / min, the calcination temperature is 880° C., the calcination time is 12 hours, and the calcination atmosphere is oxygen to obtain the ternary material II;

[0038] 3) Put tetrabutyl titanate into a glass container and heat at a temperature of 300°C, and bring the volatilized tetrabutyl titanate into the above-mentioned vapor deposition furnace through flowing nitrogen gas for chemical deposition at a deposition temperature of 600°C. The deposition time is 6 hours, and the vapor-coated ternary material...

Embodiment 2

[0052] A method for preparing a chemical vapor deposition method to coat a high-voltage ternary material, comprising the following steps:

[0053] 1) According to the molecular formula Li 1.05 Ni 0.5 co 0.2 mn 0.3 o 2 , weigh lithium source, Ni 0.5 co 0.2 mn 0.3 (OH) 2 The precursor is added to a high-speed mixer and mixed evenly to obtain a mixture I;

[0054] 2) Put the mixture I into a vapor deposition furnace for high-temperature calcination, the rotation speed of the furnace body is 3 revolutions per minute, the calcination temperature is 960° C., the calcination time is 8 hours, and the calcination atmosphere is oxygen to obtain the ternary material II;

[0055] 3) Put titanium tetrachloride into a glass container and heat at a heating temperature of 350°C, and bring the volatilized titanium tetrachloride into the above-mentioned vapor deposition furnace through flowing argon gas for chemical deposition at a deposition temperature of 700°C. The deposition time i...

Embodiment 3

[0065] A method for preparing a chemical vapor deposition method to coat a high-voltage ternary material, comprising the following steps:

[0066] 1) According to the molecular formula Li 1.05 Ni 0.6 co 0.2 mn 0.2 o 2 , weigh lithium source, Ni 0.6 co 0.2 mn 0.2 (OH) 2 The precursor is added to a high-speed mixer and mixed evenly to obtain a mixture I;

[0067] 2) Put the mixture I into a vapor deposition furnace for high-temperature calcination, the rotation speed of the furnace body is 3 revolutions per minute, the calcination temperature is 880°C, the calcination time is 8h, and the calcination atmosphere is oxygen to obtain the ternary material II;

[0068] 3) Put titanium tetrachloride into a glass container and heat at a heating temperature of 350°C, and bring the volatilized titanium tetrachloride into the above-mentioned vapor deposition furnace through flowing helium gas for chemical deposition at a deposition temperature of 700°C. The deposition time is 4h, ...

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Abstract

The invention discloses a method for coating carbon by chemical vapor deposition and the prepared coated high-voltage ternary material. Firstly, the ternary material is generated in a dynamic chemical vapor deposition furnace, and then the liquid titanium source is vaporized to utilize the ternary material in a dynamic chemical vapor deposition furnace. Oxidative decomposition in an oxygen atmosphere, a chemical vapor deposition reaction occurs at the interface of the ternary material, and a ternary material with uniform and dense coating of titanium oxide is generated in situ; then carbon coating is carried out in a series of two-stage vapor deposition furnaces; finally through Crushed, sieved, and packaged to get the final product. The invention significantly improves the uniformity and compactness of the coating by coating titanium oxide in the gas phase, and effectively solves the problem of carbon reduction of metal elements of ternary materials under high temperature conditions through the design of the secondary vapor deposition furnace process; chemical vapor deposition The kiln is a dynamic kiln, so the one-time roasted product will not harden, and can continue to be coated, which greatly simplifies the process flow.

Description

technical field [0001] The invention relates to the field of cathode materials for lithium-ion secondary batteries, in particular to a method for coating carbon by chemical vapor deposition and the prepared coated high-voltage ternary material. Background technique [0002] The promotion and application of new energy vehicles is imperative, among which the power lithium-ion battery is the core part of new energy vehicles, and the positive electrode material in the lithium-ion battery system is the decisive factor. In the existing cathode material system, ternary materials have the advantages of high specific energy density and good cycle performance, and are the mainstream materials for new energy vehicles. However, the existing conventional ternary materials will be oxidized to tetravalent nickel during the charging process of divalent nickel and trivalent nickel, and tetravalent nickel has a strong catalytic and oxidative effect on the existing carbonate electrolyte system...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G53/00C01B32/05H01M4/36H01M4/505H01M4/525H01M4/62
CPCC01G53/006C01B32/05H01M4/366H01M4/505H01M4/525H01M4/628H01M4/625C01P2006/40C01P2004/80Y02E60/10
Inventor 宋英杰徐宁马倩倩伏萍萍
Owner TIANJIN B&M SCI & TECH
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