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Method for preparing lithium-enriched manganese-based anode material of nano-oxide-coated lithium ion battery

A nano-oxide, lithium-rich manganese-based technology, applied in battery electrodes, nanotechnology, nanotechnology, etc., can solve problems such as poor controllability and complex coating process, and achieve improved rate performance, low irreversible capacity, and rate performance Improved effect

Active Publication Date: 2013-12-11
TIANJIN B&M SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing coating process is complicated and the controllability is poor

Method used

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  • Method for preparing lithium-enriched manganese-based anode material of nano-oxide-coated lithium ion battery
  • Method for preparing lithium-enriched manganese-based anode material of nano-oxide-coated lithium ion battery
  • Method for preparing lithium-enriched manganese-based anode material of nano-oxide-coated lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1) Preparation of lithium-rich cathode material Li 1.2 mn 0.6 Ni 0.2 o 2 :

[0032] Weigh NiSO according to the molar ratio Mn:Ni=0.6:0.2 4 ·6H 2O and MnSO 4 ·H 2 O, prepared into a solution A with a metal ion concentration of 2mol / L; then press the metal ion and OH - Weigh NaOH with a molar ratio of 1:2, and prepare a NaOH solution with a concentration of 4mol / L; according to the concentration of ammonia water in the solution after mixing is 0.25mol / L, add an appropriate amount of ammonia water to the prepared NaOH solution, mix well and record it as a solution B: Slowly add solutions A and B into the reactor at the same time at the same rate, control the pH value of the reaction process to be 11.6-11.8, the temperature is 60°C, and the stirring speed is 500 rpm. After the reaction is complete, age for 6 hours. Then suction filter, wash, and dry to obtain nickel-manganese hydroxide precursor powder; sinter the prepared precursor powder at 500°C for 6 hours to c...

Embodiment 2

[0038] 1) Preparation of lithium-rich cathode material Li 1.2 mn 0.6 Ni 0.2 o 2 , the steps are the same as step 1 of Example 1).

[0039] 2) Weigh 0.02g of nano-magnesium oxide and 9.98g of lithium-rich manganese-based cathode material Li 1.2 mn 0.6 Ni 0.2 o 2 , put in a ball mill, add 50ml of ethanol, and carry out ball milling and mixing, the rotating speed is 600r / min, and the ball milling time is 5h. The mixture was dried at 120°C for 20h, placed at 900°C for 5h, the heating and cooling rate was controlled at 5°C / min, and ground to prepare 2wt% nano-magnesium oxide-coated Li 1.2 mn 0.6 Ni 0.2 o 2 .

[0040] 2wt% MgO-coated sample was used as the positive electrode to form a button battery for testing. figure 2 with image 3 Compared with the electrochemical performance of uncoated samples, the first charge and discharge capacities of 2wt% coated samples were 314.5mAh / g and 241.7mAh / g respectively, and the first efficiency was 76.8%, which was significantly i...

Embodiment 3

[0042] 1) Preparation of lithium-rich cathode material Li 1.2 mn 0.6 Ni 0.2 o 2 , the steps are the same as step 1 of Example 1).

[0043] 2) Weigh 10g of nano-titanium oxide and 990g of lithium-rich manganese-based cathode material Li 1.2 mn 0.6 Ni 0.2 o 2 , placed in a high-speed mixer for high-speed mixing, the rotating speed is 5000r / min, and the mixing time is 3h. Then control the heating rate at 5°C / min, raise the temperature to 800°C, sinter at a constant temperature for 5 hours, then cool down to room temperature at 5°C / min, and grind to prepare nano-titanium oxide-coated Li 1.2 mn 0.6 Ni 0.2 o 2 .

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Abstract

The invention discloses a method for preparing a nano-oxide-coated lithium-enriched manganese-based anode material of a lithium ion battery, which comprises the following steps: (1) preparing a lithium-enriched manganese-based anode material [Li1+(1-2x) / 3Mn(2-x) / 3Mx]O2; (2) weighing nanoscale metal oxide and the prepared lithium-enriched manganese-based anode material [Li1+(1-2x) / 3Mn(2-x) / 3Mx]O2 according to the mass ratio of (0.1 to 10):(90 to 99.9) and uniformly mixing the nanoscale metal oxide and the prepared lithium-enriched manganese-based anode material; (3) after drying the mixture, heating to a temperature of 400 to 1,000 DEG C at a speed of 0.1 to 10 DEG C per minute, keeping the constant temperature for 2 to 20h, then cooling to the room temperature at a speed of 0.1 to 10 DEG C per minute and grinding to obtain the nano-oxide-coated lithium-enriched manganese-based anode material. The method reduces the first irreversible capacity of the lithium-enriched anode material, improves circulating stability and rate performance of the material, adopts a simple process and is low in cost.

Description

technical field [0001] The invention relates to the field of preparation of positive electrode materials for lithium ion batteries, and is particularly suitable for the preparation method of lithium-rich manganese-based positive electrode materials for lithium ion batteries. Background technique [0002] Since the commercialization of lithium-ion batteries, they have been widely used in many fields such as portable electronic devices, and have begun to develop fields such as electric vehicles and large-scale energy storage. The current marketable cathode material LiCoO 2 , LiMn 2 o 4 、LiFePO 4 、LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 、LiNi 0.5 co 0.2 mn 0.3 o 2 The specific capacity is low and the cost is high, so it is difficult to meet the high energy and high power requirements of electric vehicle lights for lithium-ion batteries. People have been working hard to explore new high-capacity cathode materials that are rich in raw materials, environmentally friendly, and can r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01M4/62B82Y30/00
CPCY02E60/10
Inventor 徐宁王志远吕菲程晓坤吴孟涛
Owner TIANJIN B&M SCI & TECH
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