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High-voltage lithium ion battery cathode material and preparation method thereof

A technology for lithium-ion batteries and cathode materials, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as restricting the commercial development of materials, difficulties in lithium manganese oxides, affecting the service life of materials, etc., to improve cycle stability and The effect of thermal stability, batch stability and low manufacturing cost

Active Publication Date: 2014-03-26
徐源庆
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, through research, it was also found that the preparation of layered partial lithium manganese oxides is very difficult due to the instability of the structure, and the structure of the material undergoes small irreversible changes during the electrochemical cycle, and the accumulation of these changes affects the service life of the material.
The defects of this material are not allowed in commercial mass production, which restricts the commercial development of this material

Method used

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  • High-voltage lithium ion battery cathode material and preparation method thereof
  • High-voltage lithium ion battery cathode material and preparation method thereof
  • High-voltage lithium ion battery cathode material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0022] A preparation method of a high-voltage lithium-ion battery cathode material, the steps are as follows:

[0023] 1) Prepare 25L of 2M salt solution with 2656g nickel sulfate, 1437g cobalt sulfate and 5923g manganese sulfate;

[0024] 2) Inject the prepared 25L salt solution into a reaction kettle with a rotating speed of 300rps at a speed of 1L / h, and inject a mixed aqueous solution of sodium hydroxide-ammonia water at the same time, and the mixed aqueous solution of sodium hydroxide-ammonia water is a NaOH aqueous solution with a concentration of 6M Mix and prepare the ammonia water with a concentration of 10M at a volume ratio of 7:1. Pay attention to adjusting the flow rate of the alkali solution to keep the pH value between 10-11. After the salt solution is completely injected into the reactor, continue to stir and age for 24 hours. The precursor preparation reaction Complete, the solid-liquid mixture after the reaction is separated by centrifugation, washed to neutr...

Embodiment 2

[0028] A preparation method of a high-voltage lithium-ion battery cathode material, the steps are as follows:

[0029] 1) same as embodiment 1;

[0030] 2) same as embodiment 1;

[0031] 3) Lithium carbonate and solid solution material precursors were evenly mixed according to the molar ratio of lithium to metal ions of 1.2:1, pre-calcined at 500°C for 4 hours, cooled and then ground, then calcined at 900°C for 12 hours, and the material was cooled After grinding and sieving, the layered and spinel composite structure solid solution material Li 1.2 Ni 0.2 mn 0.7 co 0.1 o 2.2 .

[0032] The solid solution material was made into a 2032 button battery for testing. In the voltage range of 2.0V-4.95V with a current density of 20mAh / g, the first charge specific capacity was 230.8mAh / g, the first discharge specific capacity was 177mAh / g, and the first efficiency 76.69%, 83.87% cycle retention after 50 weeks.

Embodiment 3

[0034] A preparation method of a high-voltage lithium-ion battery cathode material, the steps are as follows:

[0035] 1) same as embodiment 1;

[0036] 2) same as embodiment 1;

[0037] 3) The lithium source and the solid solution material precursor are uniformly mixed according to the molar ratio of lithium source and metal ion of 1.7:1. The lithium source is a mixture of lithium carbonate and lithium nitrate with a mass ratio of 7:3, prior to Pre-fired at 500°C for 4 hours, ground after cooling, and then calcined at 900°C for 12 hours. After the material was cooled, it was ground and sieved to obtain a layered and spinel composite structure solid solution material Li 1.4 Ni 0.2 mn 0.7 co 0.1 o 2.4 .

[0038] The solid solution material was made into a 2032 button battery for testing. In the voltage range of 2.0V-4.95V with a current density of 20mAh / g, the specific capacity for the first charge was 314.9mAh / g, and the specific capacity for the first discharge was 228.8m...

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Abstract

The invention discloses a high-voltage lithium ion battery cathode material and a preparation method thereof. The high-voltage lithium ion battery cathode material is a solid solution material with a stratiform and spinel composite structure, and the molecular formula of the cathode material is LixNi0.25-zMn0.75-zM2zOy, wherein M is one or two of doped metals of Co, Al, Cr, Mn and Ga, x is more than 0 and less than 2, y is more than or equal to 2 and less than or equal to 3, and z is more than 0 and less than or equal to 0.25. The invention has the advantages that: the cathode material has the stratiform and spinel composite structure, the high specific capacity advantage of a manganese-based solid solution material is kept, and the cycle stability and the thermal stability of the material are improved; the impedance of the cathode material is reduced by doping, so that the thermal stability of the material is further improved, and the heat release is reduced to improve the comprehensive electrochemical performance of the material; and the preparation process of the material has high controllability, the manufacturing cost is low, and the manufacturing process has high repeatability and high batch stability, production management is facilitated, and the application demands on high-voltage and high-specific-capacity materials on the market are met.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery cathode materials, and in particular relates to a high-voltage lithium-ion battery cathode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries are a new generation of secondary batteries after lead-acid batteries, nickel-cadmium batteries and nickel-metal hydride batteries. Today, when the world is facing continuous shortage of oil resources and deteriorating environment, lithium-ion batteries have become a high-tech development due to their advantages such as high capacity, long cycle life, small self-discharge, no memory effect, no environmental pollution and good safety performance. One of the key points, it is considered to be an ideal choice for high-capacity, high-power batteries, and is an environmentally friendly power source in the 21st century. Since the commercialization of rechargeable lithium-ion batteries in 1990, its applicatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525
CPCY02E60/122Y02E60/10
Inventor 张联齐杨瑞娟郭建侯配玉周恩娄
Owner 徐源庆
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