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Titanium-doped lithium-enriched manganese-based lithium ionic battery cathode material and preparation method thereof

A lithium-rich manganese-based lithium and cathode material technology, applied in battery electrodes, positive electrodes, secondary batteries, etc., can solve the problems of low specific capacity and short cycle life of materials, and achieve improved comprehensive performance and short preparation cycle. , the effect of improving the electrochemical performance

Inactive Publication Date: 2018-02-23
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The invention provides a titanium-doped lithium-rich manganese-based positive electrode material for lithium-ion batteries and a preparation method thereof to solve the problems that the current lithium-rich layered material has a short cycle life and the material specific capacity is not high under high magnification

Method used

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  • Titanium-doped lithium-enriched manganese-based lithium ionic battery cathode material and preparation method thereof
  • Titanium-doped lithium-enriched manganese-based lithium ionic battery cathode material and preparation method thereof
  • Titanium-doped lithium-enriched manganese-based lithium ionic battery cathode material and preparation method thereof

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Embodiment 1

[0037] (1) Co-precipitation steps to prepare nickel-cobalt-manganese carbonate precursor:

[0038] Such as figure 1 , Nickel sulfate, cobalt sulfate, manganese sulfate are formulated into the uniform solution that metal ion concentration is 1mol / L according to the metal ion ratio Ni:Co:Mn=1:1:4 of prepared material, and described metal ion refers to Ni, The sum of Co and Mn ions. Weigh a sufficient amount of sodium carbonate to prepare a 2mol / L solution as a precipitant, and add saturated ammonia to the sodium carbonate solution to prepare a 0.3mol / L ammonia complexing agent. The ratio of nickel-cobalt-manganese metal ions in the bottom liquid of the reactor is the same as that of the feed liquid, and the concentration of metal ions in the bottom liquid is 0.167mol / L. Add ammonia complexing agent into the reactor until the bottom liquid environment in the reactor reaches pH =8.0, adjust the temperature in the kettle to 50°C, and the stirring speed to 500rpm, continuously add...

Embodiment 2

[0045] (1) Co-precipitation steps to prepare nickel-cobalt-manganese carbonate precursor:

[0046] Nickel acetate, cobalt acetate, and manganese acetate are formulated into a uniform solution with a metal ion concentration of 1mol / L according to the metal ion ratio of the prepared material Ni:Co:Mn=1:1:4, and a sufficient amount of sodium carbonate is weighed to prepare 2mol / L solution is used as a precipitant, and NaOH solution is added to the sodium carbonate solution to form a 0.3mol / L complex precipitant. The ratio of nickel-cobalt-manganese metal ions in the bottom liquid of the reactor is the same as that of the feed liquid, and the concentration of metal ions in the bottom liquid is 0.167mol / L. Add a complexing precipitation agent into the reactor to make the environment of the bottom liquid in the reactor reach the pH =8.0, when the temperature in the kettle was 50°C, and the stirring speed was 500 rpm, the salt solution was continuously added into the reaction kettle...

Embodiment 3

[0053] (1) Co-precipitation steps to prepare nickel-cobalt-manganese carbonate precursor:

[0054] Such as figure 1 , nickel nitrate, cobalt nitrate, manganese nitrate are formulated into a uniform solution with a metal ion concentration of 1mol / L according to the metal ion ratio Ni:Co:Mn=1:1:4 of the prepared material, and a sufficient amount of sodium carbonate is weighed to prepare 2mol / L solution is used as a precipitating agent, and KOH solution is added to the sodium carbonate solution to form a 0.3mol / L complex precipitating agent. The proportion of nickel-cobalt-manganese metal ions in the bottom liquid of the reactor is the same as that of the feed liquid, and the concentration of metal ions in the bottom liquid is 0.167mol / L. Add a complexing precipitant into the reactor until the bottom liquid environment in the reactor reaches pH =8.5, when the temperature in the kettle was 50°C, and the stirring speed was 500 rpm, the salt solution was continuously added into the...

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Abstract

The invention discloses a titanium-doped lithium-enriched manganese-based lithium ionic battery cathode material and a preparation method thereof. The titanium-doped nickel cobalt lithium manganite has a chemical general formula of Li1.2Ni0.13Co0.13Mn(0.54-x)TixO2, and x is more than 0 and less than 0.123. According to the preparation method, a precursor [Ni0.13Co0.13Mn0.54]CO3 is prepared by utilizing sodium carbonate as a precipitator, regulating the pH value with industrial ammonia water and providing Ni, Co, Mn lithium-inserted substrate with a transition metal salt solution, the quantityrelative ratio of the precursor to the lithium source is M:Li being 1:1.4 (M is Ni, Co and Mn), and Li atoms is excessive by 3-8 percent; a titanium source is added into the precursor mixed with lithium in a ratio of 1.5-4.5g / ml, and is subjected to planet ball-mill mixing; and a solid phase is carried out at high temperature of 750-950 DEG C for 12-18 hours to prepare the titanium-doped lithium-enriched manganese-based lithium ionic battery cathode material with high capacity and long service life. The lithium ionic battery cathode material can be used for solving the problems of low specificcapacity and poor circulation performance of existing stratified lithium-enriched materials.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a preparation method of a titanium-doped lithium-rich manganese-based positive electrode material with high specific capacity and long service life. Background technique [0002] Since entering the 21st century, energy issues have been plaguing countries all over the world. With the rapid development of intelligent technology and industrial technology, a large amount of non-renewable resources are consumed. Now the competition between countries is not only a contest of economic strength, but more and more reflected in resources (coal, oil, natural gas), energy (solar, hydro, wind, geothermal, etc.) competition. In my country, the energy structure dominated by traditional petrochemicals can no longer meet the needs of the society, and the resulting environmental pollution, ecological imbalance and other problems are becoming more and more serious, endang...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M10/0525H01M2004/028Y02E60/10
Inventor 陈龙徐如玉栗欢欢陈彪刘成洋
Owner JIANGSU UNIV
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