Method for modifying lithium nickel manganese oxide positive electrode material for lithium ion battery

A lithium-ion battery, lithium nickel manganate technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as affecting the modification effect, and achieve the effect of improving the modification effect and excellent cycle performance.

Active Publication Date: 2015-07-08
天津寻木科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is difficult to achieve a uniform and complete coating of the m

Method used

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  • Method for modifying lithium nickel manganese oxide positive electrode material for lithium ion battery
  • Method for modifying lithium nickel manganese oxide positive electrode material for lithium ion battery
  • Method for modifying lithium nickel manganese oxide positive electrode material for lithium ion battery

Examples

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Embodiment 1

[0023] Example 1: Lithium nickel manganese oxide LiNi with the coating amount of alumina 0.5 mn 1.5 o 4 1% of the mass of the material calculates the molar amount of aluminum element, and then converts the molar amount and mass of sodium metaaluminate, and weighs lithium nickel manganate and sodium metaaluminate, and prepares sodium metaaluminate to a concentration of 0.1mol / L solution. Add lithium nickel manganese oxide to water, add 1g lithium nickel manganese oxide per 20mL of water, ultrasonically activate for 15 minutes to obtain a suspension, and then add hexadecyl trimethyl with a mass of 0.5% lithium nickel manganese oxide to the suspension Ammonium bromide, ultrasonically disperse for 15 minutes; then add sodium metaaluminate solution, the addition amount is 5% of the prepared sodium metaaluminate solution, and continue ultrasonication for 15 minutes; while stirring, pass carbon dioxide gas into the mixed solution until the pH of the solution is 8.0, then continue...

Embodiment 2

[0024] Embodiment 2: LiNi lithium nickel manganate with the coating amount of aluminum oxide 0.5 mn 1.5 o 43% of the material mass Calculate the molar amount of aluminum element, and then convert the molar amount and mass of sodium metaaluminate, and weigh lithium nickel manganate and sodium metaaluminate, and prepare sodium metaaluminate to a concentration of 0.3mol / L solution. Add lithium nickel manganese oxide to water, add 1g lithium nickel manganese oxide per 30mL of water, and ultrasonically activate for 15 minutes to obtain a suspension, then add dodecyl trimethyl with a mass of 1% of the mass of lithium nickel manganese oxide to the suspension Ammonium bromide, ultrasonically disperse for 15 minutes; then add sodium metaaluminate solution, the addition amount is 10% of the prepared sodium metaaluminate solution, and continue ultrasonication for 15 minutes; while stirring, pass carbon dioxide gas into the mixed solution until the pH of the solution is 9.0, then cont...

Embodiment 3

[0025] Embodiment 3: Lithium nickel manganese oxide LiNi with the coating amount of aluminum oxide 0.5 mn 1.5 o 4 5% of the mass of the material calculates the molar amount of aluminum element, and then converts the molar amount and mass of sodium metaaluminate, and weighs lithium nickel manganate and sodium metaaluminate, and prepares sodium metaaluminate to a concentration of 0.5mol / L solution. Add lithium nickel manganese oxide to water, add 1g lithium nickel manganese oxide per 40mL of water, ultrasonically activate for 15min to obtain a suspension, and then add hexadecyl trimethyl with a mass of 2% lithium nickel manganese oxide to the suspension Ammonium bromide, ultrasonically disperse for 15 minutes; then add sodium metaaluminate solution, the addition amount is 10% of the prepared sodium metaaluminate solution, and continue ultrasonication for 15 minutes; while stirring, pass carbon dioxide gas into the mixed solution until the pH of the solution is 10.0, then con...

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Abstract

The invention discloses a method for modifying a lithium nickel manganese oxide positive electrode material for a lithium ion battery. The method comprises the following steps: adding lithium nickel manganese oxide into water, and adding a surfactant into the turbid liquid; adding 5-15 percent of the prepared sodium metaaluminate solution, and introducing carbon dioxide gas into the mixed solution while stirring until the pH value of the solution is 8.0-10.0; dripping the residual sodium metaaluminate solution, introducing the carbon dioxide gas, controlling the pH value of the solution to be 8.0-10.0, and carrying out a concurrent flow reaction; stirring, aging, filtering, washing, drying, thereby obtaining an aluminum hydroxide coated lithium nickel manganese oxide material; and performing heat treatment on the material in a muffle furnace for 300-450 DEG C, thereby obtaining the alumina coated and modified lithium nickel manganese oxide positive electrode material. According to the coated and modified lithium nickel manganese oxide positive electrode material disclosed by the invention, the capacity retention ratio is 99.8 percent under the 1C rate after cycling for 100 times, and compared with that of an uncoated material, the capacity retention ratio is improved by about 10 percent.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery cathode materials for chemical power sources, and in particular relates to a surface coating modification method for lithium nickel manganese oxide cathode materials. technical background [0002] Spinel lithium nickel manganese oxide (LiNi 0.5 mn 1.5 o 4 ) cathode material is one of the most researched high specific energy cathode materials. Its discharge voltage platform is 4.7V (vs.Li / Li + ), which is about 20% higher than lithium manganate, and the reversible capacity can reach more than 130mAh / g (theoretical capacity is 147mAh / g), which is also about 20% higher than lithium manganate, thus having a higher energy density than lithium manganate. More importantly, all the Mn in the structured lithium nickel manganese oxide is +4, which prevents the Mn 3+ The resulting disproportionation reaction and Jahn-Teller effect, cycle performance and high-rate discharge performance are ex...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 王丽郅晓科刘贵娟陈丹梁广川
Owner 天津寻木科技有限责任公司
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