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Preparation method of lithium-ion battery cathode material

A lithium-ion battery, cathode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as long-term grinding and mixing, limited mixing uniformity, batch problems, etc., to improve electrochemical performance, particle size, etc. The effect of uniform size and good crystallinity

Inactive Publication Date: 2018-08-07
南京红太阳新能源有限公司
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  • Abstract
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  • Application Information

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Problems solved by technology

The high-temperature solid-phase synthesis method is simple, but has the following disadvantages: (1) The powder raw materials need to be ground and mixed for a long time, and the degree of uniformity of mixing is limited; (2) There are large differences in the composition, structure, and particle size distribution of the products. , there is a batch problem, which makes the electrochemical performance of the material difficult to control

Method used

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  • Preparation method of lithium-ion battery cathode material
  • Preparation method of lithium-ion battery cathode material
  • Preparation method of lithium-ion battery cathode material

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Embodiment

[0026] A kind of preparation method of lithium-ion battery cathode material, comprises the following steps: the preparation of a, precursor;

[0027] b. High temperature solid phase sintering;

[0028] c. Surface coating.

[0029] Step a is: Weighing equimolar amounts of analytically pure CoAc according to 1:1:1 2 4H 2 O. NiAc 2 4H 2 O, MnAc 2 4H 2 O, under slight heating and stirring, dissolve with deionized water to form solution A; then use (NH 4 ) 2 C 2 o 4 ·H 2 O is used as a precipitating agent, and a little excess of analytically pure (NH 4 ) 2 C 2 o 4 , also dissolved in deionized water under slight heating (30°C) and stirring to form solution B; then use the solution as the base solution, and add solution A to solution B dropwise under high-speed stirring; Afterwards, continue to stir for 0.5 h, and let stand for 3 to 5 h to make the precipitation complete; pour off the supernatant, and put it into a blast drying oven for overnight drying; then add 3 ti...

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Abstract

The invention discloses a preparation method of a lithium-ion battery cathode material, comprising the steps of a, preparing a precursor; b, performing high temperature solid sintering; c, performingsurface coating. The nickel-cobalt-manganese ternary cathode material has good crystallization effect, good uniformity of particle sizes and good distribution uniformity; the ideal layered structure helps improve electrochemical performances of the material can be improved; the material that is subjected to surface coating has increased initial discharge capacity. Cycle test performance results show that after 20 uses, battery capacity of a battery not coated with cathode material starts to decrease sharply; samples that are surface coated still have high capacity maintaining rate and good cycle stability; after 30 cycles of use for a sample, the material Li7La3Zr2O1 can significantly improve the cycle performance of a battery.

Description

technical field [0001] The invention specifically relates to a preparation method of a positive electrode material of a lithium ion battery. Background technique [0002] scene technology [0003] Lithium-ion batteries have the advantages of high working voltage, light weight, small volume, high energy density, no memory effect, small self-discharge, and long cycle life, and are widely used. Since Sony released the first commercial lithium-ion battery in 1991, lithium-ion batteries have been widely used in consumer digital electronic products today. In recent years, with the development of the new energy vehicle industry, the rapid development of lithium-ion vehicle power batteries requires lithium-ion batteries with higher energy density, better safety performance and lower cost to meet market demand. [0004] Cathode material is one of the main components of lithium-ion batteries. In recent years, lithium-nickel-cobalt-manganese (Li-Ni-Co-Mn) material has been considere...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/628H01M10/0525Y02E60/10
Inventor 孙兰娟钱阳芮忠南李健
Owner 南京红太阳新能源有限公司
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