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Method for preparing positive electrode material of anion-cation multi-component compound lithium battery

A multi-component composite and positive electrode material technology, applied in the direction of battery electrodes, circuits, electrical components, etc., to achieve the effect of improving the discharge platform, improving the performance of large rate performance, and good rate performance

Active Publication Date: 2010-05-12
重庆特瑞新能源材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, the method disclosed in Chinese patent (CN100470894C) and the method for preparing LiFePO4 by partial substitution of P sites and (CN100494052C) only adopt partial P site substitutions, but do not use partial effective metal cation groups to replace Fe sites to achieve anion, cation and ionic groups. The synergistic effect of synergistically improving the diffusion pathway of lithium ions and the effect of electronic conductivity

Method used

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  • Method for preparing positive electrode material of anion-cation multi-component compound lithium battery
  • Method for preparing positive electrode material of anion-cation multi-component compound lithium battery
  • Method for preparing positive electrode material of anion-cation multi-component compound lithium battery

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Embodiment 1

[0026] After the sulfate solution of Ni, Co, Mn is mixed uniformly by Ni: Co: Mn=0.5: 0.3: 0.2 molar ratio, control pH at 11.5 with a certain amount of sodium hydroxide solution containing ammonia 5% (weight ratio) The co-precipitation reaction was realized under the conditions to generate the ternary precursor (Ni 0.5 co 0.3 mn 0.2 )(OH) 2 .

[0027] Take 0.5mol lithium carbonate Li 2 CO 3 , 0.475mol of ferric oxide Fe 2 o 3 , 0.05mol ternary precursor compound (Ni 0.5 co 0.3 mn 0.2 )(OH)2, 0.8mol concentration of 85% phosphoric acid H 3 PO 4 , 0.1mol ammonium chloride NH 4 Cl, 0.1mol tungstic acid H 2 WO 4 and 0.12mol glucose. After mixing, add water as the ball milling medium and ball mill for 8 hours, and obtain the precursor powder by spray drying. Put the precursor powder into the tube furnace under the protection of nitrogen gas, raise it to 650°C at 15°C / min, and keep the temperature for 8 hours. Then naturally cooled to room temperature and taken out t...

Embodiment 2

[0030] After the sulfate solution of Ni, Co, Mn is mixed uniformly by Ni: Co: Mn=2: 2: 1 molar ratio, control the pH at 9.5 with a certain amount of sodium hydroxide solution containing ammonia 15% (weight ratio) The co-precipitation reaction was realized under the conditions to generate the ternary precursor (Ni 0.4 co 0.4 mn 0.2 )(OH) 2 .

[0031] Take 0.5mol lithium carbonate Li 2 CO 3 , 0.475mol ferric oxide Fe 2 o 3 , 0.05mol ternary precursor (Ni 0.5 co 0.3 mn 0.2 )(OH) 2 , 0.6mol ammonium dihydrogen phosphate NH 4 h 2 PO 4 , 0.1mol ammonium chloride NH 4 Cl, 0.3mol silicic acid H 2 SiO 3 and 0.12mol glucose. After mixing, add water as the ball milling medium and ball mill for 8 hours, and obtain the precursor powder by spray drying. Put the precursor powder in the tube furnace under the protection of nitrogen gas, raise the temperature to 700°C at 15°C / min, and keep the temperature for 6 hours. Then naturally cooled to room temperature and taken out to...

Embodiment 3

[0034] After the sulfate solution of Ni, Co, Mn is mixed uniformly by Ni: Co: Mn=1: 1: 1 molar ratio, control the pH at 10 with a certain amount of sodium hydroxide solution containing ammonia 10% (weight ratio) The co-precipitation reaction was realized under the conditions to generate the ternary precursor (Ni 1 / 3 co 1 / 3 mn 1 / 3 )(OH) 2 .

[0035] Weigh 0.5mol lithium carbonate Li 2 CO 3 , 0.475mol ferric oxide Fe 2 o 3 , 0.05mol. Ternary precursor (Ni 1 / 3 co 1 / 3 mn 1 / 3 )(OH) 2 , 0.6mol ammonium dihydrogen phosphate NH 4 h 2 PO 4 , 0.1mol sulfur elemental S, 0.3mol boric acid H 3 BO 4 and 0.12mol glucose. After mixing, add water as the ball milling medium and ball mill for 8 hours, and obtain the precursor powder by spray drying. Put the precursor powder in the tube furnace under the protection of nitrogen gas, raise the temperature to 700°C at 15°C / min, and keep the temperature for 6 hours. Then naturally cooled to room temperature and taken out to obtain th...

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Abstract

The invention discloses a method for preparing a positive electrode material of an anion-cation multi-component compound lithium battery, which comprises the following steps of: performing ball-milling mixing on a substitute and a substrate raw material, adding at least one of water, ethanol and acetone serving as a ball-milling solvent into the mixture; performing spray drying to obtain a precursor; and sintering the spray-drying precursor under the protection of an inert atmosphere to finally obtain LiFe1-m(NixCoyMnz)mP1-nDnO4 positive electrode material of the lithium battery. The molecular formula of the material is LiFe1-m(NixCoyMnz)mP1-n-DnO4, wherein the Fe position is partially substituted by a ternary precursor (NixCoyMnz)(OH)2, and simultaneously the D at the P position uses a compound or a simple substance of boron, sulfur, silicon, chlorine, selenium, tellurium and tungsten and adopts a multi-component composite radical as a substitute to achieve the synergistic action of anions and cations or ion radicals so as to synchronously improve the ion diffusion and the electron conductivity of the material. The material prepared by the method has high charge and discharge capacities, good multiplying factor performance and good circle performance.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a preparation method of a positive electrode material of a lithium ion battery. Background technique [0002] With the increasing popularity of various portable electronic products, the battery as a portable power supply device has attracted increasing attention. my country has become a big country in battery production and consumption. The environment has caused great pollution. Facing the increasingly stringent requirements for environmental protection in the world, the development of green energy is imminent. High-performance rechargeable green lithium-ion secondary batteries have been widely used in various portable electronic products and communication tools in recent years, and have been gradually developed as power sources for electric vehicles. The performance and cost of lithium-ion batteries depend largely on the positive electrode material. F...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139H01M4/36
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 刘悉承许文湘程冲
Owner 重庆特瑞新能源材料有限公司
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