Method for modifying surface of anode material Li1.2Ni0.13Co0.13Mn0.54O2 for lithium ion battery

A technology for lithium-ion batteries and lithium-rich cathode materials, which is applied in battery electrodes, circuits, electrical components, etc., can solve the problems of large irreversible capacity loss during first charge and discharge, unfavorable lithium-ion battery cycle life, cycle performance and rate performance degradation, etc. , to alleviate disappearance and harmful side reactions, reduce irreversible capacity loss, and improve rate performance

Inactive Publication Date: 2015-05-27
MCNAIR TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lithium-ion battery cathode material Li 1.2 Ni 0.13 co 0.13 mn 0.54 o 2 Li 2 Delithiation in the form of O is accompanied by the disappearance of some oxygen vacancies, and the subsequent lithium ions cannot be reintercalated, resulting in a large irreversible capacity loss for the first charge and discharge.
At high voltage, the electrode material is in direct contact with the electrolyte, and harmful side reactions occur between the two, which is not conducive to the cycle life of lithium-ion batteries.
Many battery positive electrode surface treatment methods currently on the market reduce the irreversible capacity loss in the first cycle and improve the specific discharge capacity of the material, but there are defects such as treatment that destroys the structure of the positive electrode material, resulting in degradation of cycle performance and rate performance.

Method used

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  • Method for modifying surface of anode material Li1.2Ni0.13Co0.13Mn0.54O2 for lithium ion battery
  • Method for modifying surface of anode material Li1.2Ni0.13Co0.13Mn0.54O2 for lithium ion battery

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Experimental program
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Embodiment 1

[0031] See figure 1 , a cathode material for Li-ion batteries Li 1.2 Ni 0.13 co 0.13 mn 0.54 o 2 The surface modification method, comprises the following steps:

[0032] A. Submicron lithium-rich cathode material Li 1.2 Ni 0.13 co 0.13 mn 0.54 o 2 Preparation of:

[0033] A1. Dissolve a total of 6g of lithium nitrate, cobalt nitrate, nickel nitrate and manganese nitrate in 50mL of deionized water according to the atomic molar ratio Li:Ni:Co:Mn=1.2:0.13:0.13:0.54, and then mix polyvinyl alcohol and A total of 0.8g of glucose was added to the obtained solution, wherein the mass ratio of polyvinyl alcohol and glucose mixture was 1:3, and the pH of the solution was adjusted with nitric acid to make the pH = 0.5, and the solution was stirred and evaporated to form a gel;

[0034] A2. Dry the above-mentioned gel in a drying oven at 110°C for 24 hours, and transfer the completely dried gel to a muffle furnace. The temperature of the muffle furnace is raised to 800°C at a r...

Embodiment 2

[0039] See figure 1 , a cathode material for Li-ion batteries Li 1.2 Ni 0.13 co 0.13 mn 0.54 o 2 The surface modification method, comprises the following steps:

[0040] A. Submicron lithium-rich cathode material Li 1.2 Ni 0.13 co 0.13 mn 0.54 o 2 Preparation of:

[0041] A1. Dissolve a total of 7.4g of lithium nitrate, cobalt nitrate, nickel nitrate and manganese nitrate in 60mL of deionized water according to the atomic molar ratio Li:Ni:Co:Mn=1.2:0.13:0.13:0.54, and then dissolve polyethylene A total of 1g of alcohol and glucose was added to the obtained solution, wherein: the mass ratio of polyvinyl alcohol and glucose mixture was 1:1, the pH of the solution was adjusted with nitric acid to make the pH of the solution = 1, and the solution was stirred and evaporated to form a gel;

[0042] A2. Dry the above-mentioned gel in a drying oven at 120°C for 18 hours, transfer the completely dried gel to a muffle furnace, and the muffle furnace heats up to 900°C at a ra...

Embodiment 3

[0048] See figure 1 , a cathode material for Li-ion batteries Li 1.2 Ni 0.13 co 0.13 mn 0.54 o 2 The surface modification method, comprises the following steps:

[0049] A. Submicron lithium-rich cathode material Li 1.2 Ni 0.13 co 0.13 mn 0.54 o 2 Preparation of:

[0050] A1. Dissolve 8.8g of lithium nitrate, cobalt nitrate, nickel nitrate and manganese nitrate in 70mL deionized water according to the atomic molar ratio Li:Ni:Co:Mn=1.2:0.13:0.13:0.54 to form a solution, and then polyethylene A total of 1.2 g of alcohol and glucose was added to the resulting solution, wherein the mass ratio of polyvinyl alcohol and glucose mixture was 3:1, the pH of the solution was adjusted with nitric acid to make the pH of the solution = 1.5, and the solution was stirred and evaporated to form a gel;

[0051] A2. Dry the above-mentioned gel in a drying oven at 130°C for 12 hours, transfer the completely dried gel to a muffle furnace, and the muffle furnace heats up to 1000°C at a ...

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Abstract

The invention relates to the technical field of anode material for a lithium ion battery, and in particular relates to a method for modifying the surface of anode material Li1.2Ni0.13Co0.13Mn0.54O2 for the lithium ion battery. The method comprises the following steps: A. preparing lithium-rich anode material Li1.2Ni0.13Co0.13Mn0.54O2 powder; B. dispersing the Li1.2Ni0.13Co0.13Mn0.54O2 powder prepared in the step A into a solution of samarium nitrate and cerium nitrate; carrying out ultrasonic treatment, magnetic stirring, evaporation, drying and calcination treatment to obtain coated anode surface modification material Li1.2Ni0.13Co0.13Mn0.54O2 @ samarium-doped cerium oxide (SDC) with different SDC mass fractions. After the surface modification method is used, all the electrical properties of the lithium anode material can be comprehensively improved, namely, the first-time irreversible capacity of the material is reduced, the specific discharge capacity is increased, and the rate capability is improved; furthermore, the method is simple in technology, easy to operate, low in cost and environment-friendly, thus being suitable for large-scale industrial production.

Description

Technical field [0001] The invention involves the technology field of lithium -ion batteries, which specifically involves a li for lithium -ion battery positive pole materials 1.2 NI 0.13 CO 0.13 Mn 0.54 O 2 Surface modification method. Background technique [0002] Lithium -ion batteries have been commercialized since 1991, and have achieved unprecedented success in the electronic product power market.Lithium -ion battery positive materials are one of the bottlenecks that increase their energy density.Lithium -rich layer -shaped material XLI 2 MNO 3 (1-x) Limo 2 (M = Ni, Co, Mn) Because of its high theoretical capacity (> 250mAhg -1 ), High voltage is considered to be a powerful competitor for the next -generation lithium -ion battery positive pole material.But layered lithium -rich material li 1.2 NI 0.13 CO 0.13 Mn 0.54 O 2 There are many problems.The existence of these problems hinders layered materials li 1.2 NI 0.13 CO 0.13 Mn 0.54 O 2 Commercialization, especially in th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525
CPCY02E60/10
Inventor 武俊伟贺飞杜陈强张新河李中廷屈德扬
Owner MCNAIR TECH
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