A kind of defect structure lifepo4 surface modification layer-spinel composite lithium-rich positive electrode material and its preparation method

A lithium-rich cathode material and surface modification technology, applied in structural parts, battery electrodes, electrical components, etc., can solve the problems of no electrochemical activity, reduced material discharge capacity, limited rate characteristics, etc., and achieve good reversibility. , high capacity, the effect of reducing irreversible capacity loss

Active Publication Date: 2016-05-18
孪生(海口)投资有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current surface modification components usually only protect the surface structure of the electrode active material, and have limited effect on improving its rate characteristics; moreover, surface modification substances are often not electrochemically active, which reduces the overall discharge capacity of the material.

Method used

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  • A kind of defect structure lifepo4 surface modification layer-spinel composite lithium-rich positive electrode material and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Example 1: LiNO 3 :Mn(CH 3 COO) 2 4H 2 O:Ni(CH 3 COO) 2 4H 2 The ratio of O=0.6: 0.75: 0.25 (molar ratio) is uniformly mixed, dissolved in deionized water, and the amount of the added substance is 1.2 times of the total amount of all metal ions. The tartaric acid is fully stirred until completely dissolved; the temperature of the system is raised to 70 °C Stirring was continued until 71% of the water evaporated, at which point the solution gradually became viscous and formed a jelly. The jelly-like substance was dried in an oven at 130° C. for 22 hours and then ground in a mortar for 10 minutes. The obtained powder was heated up to 500°C at a rate of 2°C / min in a tube furnace and calcined at this temperature for 3 hours. After cooling, the powder was taken out and continued to grind in a mortar for 10 minutes, and the powder was pressed with a pressure of 100MPa. After being formed into a sheet, the temperature was raised to 850° C. for 5 hours in a tube furnace ...

Embodiment 2

[0014] Example 2: LiNO 3 :Mn(CH 3 COO) 2 4H 2 O:Ni(CH 3 COO) 2 4H 2The ratio of O=1.0: 0.75: 0.25 (molar ratio) is evenly mixed, dissolved in deionized water, and the amount of the added substance is 1.6 times of the total amount of all metal ions, and the tartaric acid is fully stirred until completely dissolved; the temperature of the system is raised to 80 °C Stirring was continued until 75% of the water evaporated, at which point the solution gradually became viscous and formed a jelly. The jelly-like substance was dried in an oven at 150° C. for 40 hours and then ground in a mortar for 20 minutes. The obtained powder was heated up to 550°C at a rate of 5°C / min in a tube furnace and calcined at this temperature for 4 hours. After cooling, the powder was taken out and continued to grind in a mortar for 20 minutes, and the powder was pressed with a pressure of 200MPa. Form into a sheet, then heat up to 900° C. for 5 hours in a tube furnace at a rate of 5° C. / min and c...

Embodiment 3

[0015] Example 3: CH 3 COOLi:Mn(CH 3 COO) 2 4H 2 O:Ni(CH 3 COO) 2 4H 2 The ratio of O=0.7: 0.75: 0.25 (molar ratio) is uniformly mixed, dissolved in deionized water, and the amount of the added substance is tartaric acid 2.0 times of the total amount of all metal ions, fully stirred until completely dissolved; the temperature of the system is raised to 85 °C Stirring was continued until 83% of the water evaporated, at which point the solution gradually became viscous and formed a jelly. The jelly-like mass was dried in an oven at 200° C. for 48 hours and then ground in a mortar for 30 minutes. The obtained powder was heated up to 600°C at a rate of 10°C / min in a tube furnace and calcined at this temperature for 5 hours. After cooling, the powder was taken out and continued to grind in a mortar for 30 minutes, and the powder was pressed with a pressure of 300MPa. It was formed into a sheet, and then calcined in a tube furnace at a rate of 9°C / min to 950°C for 15 hours, a...

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Abstract

The invention relates to a defect-structure LiFePO4 surface-modification layer-spinel composite lithium-rich anode material. The stoichiometric equation of a surface-modification layer is Lil+zFel-2yP1-y-zTizO4-delta, wherein delta= 4-[(1-2y)*2+1+(1-y)*5] / 2, y= 0.01-0.06; and z= 0.1-0.3. The stoichiometric equation of the layer-spinel composite lithium-rich anode material is Lix+0.5Mn0.75Ni0.25O0.5x+2 (x is larger than or equal to 0 but less than or equal to 0.5). The amount of substances of the surface-modification layer is 1-10 percent of the amount of the anode material. The surface-modification anode material has a high-cycle capacity holding ability and an excellent ratio characteristic.

Description

technical field [0001] The invention relates to the field of manufacturing positive electrode materials of lithium ion batteries. Background technique [0002] Lithium-ion batteries have absolute advantages such as high volume, high weight-to-energy ratio, high voltage, low self-discharge rate, no memory effect, long cycle life, and high power density. They have an annual share of more than 30 billion US dollars in the global mobile power market and far exceed other The market share of batteries is the most promising chemical power source [Wu Yuping, Wan Chunrong, Jiang Changyin, Lithium-ion Secondary Batteries, Beijing: Chemical Industry Press, 2002.]. However, since the commercialization of lithium-ion batteries in 1991, the actual specific capacity of cathode materials has always hovered between 100-180mAh / g, and the low specific capacity of cathode materials has become a bottleneck for improving the specific energy of lithium-ion batteries. In order to effectively incre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/58H01M4/131H01M4/1391
CPCY02E60/10
Inventor 水淼杨天赐舒杰程亮亮冯琳任元龙郑卫东高珊
Owner 孪生(海口)投资有限公司
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