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Method for improving cycle performance of lithium nickel manganese oxide lithium ion cathode material

A lithium nickel manganese oxide and positive electrode material technology, applied in the field of lithium ion battery positive electrode materials, can solve the problems of inapplicability to large-scale industrial production, difficulty in controlling the operation of the coating process, and difficulty in industrial production of the solution method, achieving easy operation, The effect of good material consistency and improved cycle performance

Active Publication Date: 2017-05-24
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, nickel-manganese materials also have their own shortcomings, mainly manifested in poor cycle performance, fast capacity decay, and poor rate performance. Recent studies have found that the electrochemical performance of nickel-manganese materials can be effectively improved by modifying the surface of nickel-manganese materials.
[0003] Chinese invention patent (Yang Gang, a preparation method of surface-coated lithium nickel manganese oxide cathode material, application announcement number: CN 103794777 A) prepared nickel-manganese material precursor by co-precipitation method, and then added microwave sensitive material zirconia, Generation of lithium ion conductor Li on the surface of nickel-manganese materials under the action of microwave 2 ZrO 3 , and finally prepared Li 2 ZrO 3 Coated nickel-manganese materials, although this method can obtain nickel-manganese materials with improved cycle performance, microwaves can only be coated with microwave-sensitive substances, which has great limitations, and the control process is relatively complicated. At the same time, this method Not suitable for large-scale industrial production
Chinese invention patent (Mao Wenfeng et al., a composite lithium manganese oxide cathode material and its preparation method, application publication number: CN103996844 A) improves the performance of lithium nickel manganese oxide by coating conductive polymer on the surface of lithium nickel manganese oxide material by solution method Electrochemical performance, although the material rate obtained by this method is better and the median voltage is stable, but the attenuation is still obvious, which cannot meet the requirements of power batteries. At the same time, the coating process is complicated and difficult to control. difficulty

Method used

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  • Method for improving cycle performance of lithium nickel manganese oxide lithium ion cathode material
  • Method for improving cycle performance of lithium nickel manganese oxide lithium ion cathode material
  • Method for improving cycle performance of lithium nickel manganese oxide lithium ion cathode material

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Effect test

Embodiment 1

[0026] Weigh 371.86g of lithium carbonate, 382.12g of nickel oxide, and 1322.12g of manganese dioxide, add 2.1L of absolute ethanol, mix in a stirring mill for 4h and stir evenly, dry in a blast drying oven at 80°C and place in a muffle furnace for 600 Sintering at ℃ for 6h to obtain lithium nickel manganese oxide precursor;

[0027] Weigh 1500g of lithium nickel manganese oxide precursor, weigh 62.4g of lithium carbonate, 64.6g of ammonium metavanadate, and 50g of dispersant PEG4000 according to the lithium vanadate content of 5%wt, add 1.6L of absolute ethanol and mix in a stirring mill for 4h , the precursor was dried in a blast drying oven at 80°C and then sintered in a muffle furnace at 900°C for 12h to obtain a lithium vanadate-coated lithium nickel manganese oxide lithium ion cathode material.

Embodiment 2

[0029] Weigh 371.86g of lithium carbonate, 382.12g of nickel oxide, and 1322.12g of manganese dioxide, add 2.1L of absolute ethanol, mix in a stirring mill for 4h and stir evenly, dry in a blast drying oven at 80°C and place in a muffle furnace for 500 ℃ sintering for 8h to obtain lithium nickel manganese oxide precursor;

[0030] Weigh 1500g of finished lithium nickel manganese oxide, weigh 62.4g of lithium carbonate, 64.6g of ammonium metavanadate, and 50g of dispersant PEG4000 according to the lithium vanadate content of 5%wt, add 1.6L of absolute ethanol and mix in a 10L stirring mill for 4h, The precursor was dried in a blast drying oven at 80°C, and then sintered in a muffle furnace at 900°C for 12 hours to obtain lithium vanadate-coated lithium nickel manganate lithium ion cathode material.

Embodiment 3

[0032] Weigh 371.86g of lithium carbonate, 382.12g of nickel oxide, and 1322.12g of manganese dioxide, add 2.1L of absolute ethanol, mix in a stirring mill for 4h and stir evenly, dry in a blast drying oven at 80°C and place in a muffle furnace for 600 Sintering at ℃ for 6h to obtain lithium nickel manganese oxide precursor;

[0033] Weigh 1500g of finished lithium nickel manganese oxide, weigh 24.5g of lithium carbonate, 25.9g of ammonium metavanadate, and 50g of dispersant PEG4000 according to the lithium vanadate content of 2%wt, add 1.6L of absolute ethanol and mix in a stirring mill for 4h, the precursor The body was dried in a blast drying oven at 80°C, and then sintered in a muffle furnace at 900°C for 12 hours to obtain a lithium vanadate-coated lithium nickel manganese oxide lithium ion positive electrode material.

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Abstract

The invention relates to a method for improving cycling performance of a lithium nickel manganese oxide lithium ion cathode material. The method mainly comprises the following steps of preparing a lithium nickel manganese oxide precursor and modifying lithium vanadate on the surface of the lithium nickel manganese oxide material. The method is characterized in that synthesis and surface modification of lithium nickel manganese oxide are executed by a solid-phase method, and the preparation technology comprises the following steps of (1) grinding a nickel precursor, a manganese source and a lithium precursor, uniformly mixing the obtained powder, drying, and sintering at low temperature to prepare a lithium nickel manganese oxide precursor; and (2) uniformly mixing the prepared lithium nickel manganese oxide precursor, the lithium source, a vanadium source and a dispersing agent, drying, and sintering at high temperature to prepare the lithium nickel manganese oxide cathode material with surface modified by lithium vanadate. The modified lithium nickel manganese oxide material is low in polarization and good in cycling performance, thus the method is applied to large-scale production of the lithium nickel manganese oxide lithium ion cathode material.

Description

technical field [0001] The invention relates to the technical field of cathode materials for lithium ion batteries, in particular to a method for improving the cycle performance of lithium nickel manganese oxide lithium ion cathode materials by using lithium vanadate. Background technique [0002] Spinel lithium nickel manganese oxide (LiNi 0.5 mn 1.5 o 4 ) The reversible capacity of the lithium-ion cathode material is 147mAh / g, and the voltage platform is 4.7V. It is currently considered to be the high-voltage lithium-ion cathode material with the best development prospects. Compared with the currently marketed lithium cobalt oxide, it has the advantages of high voltage, low cost, and no pollution. Compared with lithium iron phosphate materials, it has the advantages of simple preparation process, good production consistency, and wide output voltage range. It is the future Long-life, high-safety, high-capacity electric vehicle and energy storage battery cathode material ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/62
CPCH01M4/0471H01M4/366H01M4/505H01M4/525H01M4/624Y02E60/10
Inventor 马守龙杨茂萍汪涛
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY