Cathode material for lithium ion battery and preparation method thereof, cathode and lithium ion battery

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of cycle performance deterioration, safety reduction, capacity attenuation, etc., and achieve improved rate performance, low production costs, mixed discharge lessened effect

Active Publication Date: 2019-01-18
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the increase of nickel content, lithium nickel cobalt manganese oxide undergoes multiple phase transitions during the lithium ion deintercalation process, leading to structure collapse, capacity attenuation and cycle performance deterioration, while the safety is also greatly reduced.

Method used

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  • Cathode material for lithium ion battery and preparation method thereof, cathode and lithium ion battery
  • Cathode material for lithium ion battery and preparation method thereof, cathode and lithium ion battery
  • Cathode material for lithium ion battery and preparation method thereof, cathode and lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0045] will Ni 0.65 co 0.20 mn 0.15 (OH) 2 The ternary precursor and lithium carbonate are based on the metal molar ratio of 1:1.025, based on Zr, Mg and Ti, nano-zirconia (particle size is 20nm), nano-magnesium hydroxide (particle size is 20nm) and nano-titanium oxide (particle size) The diameter is 20nm) and the ternary precursor metal are mixed evenly at a molar ratio of 0.0008:0.0008:0.001:1; the mixture is placed in an atmosphere furnace and roasted at 890°C for 15h, the oxygen content is controlled at 40%, and the furnace pressure is 10Pa to obtain sintered Product; the above-mentioned sintered product was ground and sieved to obtain the lithium-ion battery positive electrode material containing doped nickel-cobalt lithium manganese oxide particles in this embodiment.

Embodiment 2

[0047] will Ni 0.65 co 0.20 mn 0.15 (OH) 2 The ternary precursor and lithium carbonate are based on the metal molar ratio of 1:1.025, based on Al, Mg and Zr, nano-alumina (particle size is 30nm), nano-magnesium hydroxide (particle size is 30nm), nano-zirconia (particle size) The diameter is 30nm) and the ternary precursor metal are mixed evenly at a molar ratio of 0.001:0.0009:0.001:1; the mixture is placed in an atmosphere furnace at 920°C for 15 hours, the oxygen content is controlled at 50%, and the furnace pressure is 10Pa to obtain sintered Product; the above-mentioned sintered product was ground and sieved to obtain the lithium-ion battery positive electrode material containing doped nickel-cobalt lithium manganese oxide particles in this embodiment.

Embodiment 3

[0049] will Ni 0.65 co 0.20 mn 0.15 (OH) 2 The ternary precursor and lithium carbonate are based on the metal molar ratio of 1:1.07. In terms of Ti and Zr, the ratio of nano-titanium oxide (particle size: 50nm), nano-zirconia (particle size: 50nm) and ternary precursor metal is 0.001: The molar ratio of 0.0015:1 is mixed evenly; the mixture is placed in an atmosphere furnace and roasted at 730°C for 22 hours, the oxygen content is controlled at 70%, and the furnace pressure is -10Pa to obtain a sintered product; the above-mentioned sintered product is ground and screened to obtain this implementation Examples of lithium-ion battery cathode materials containing doped nickel-cobalt lithium manganese oxide particles.

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Abstract

The invention relates to a lithium ion battery cathode material and a preparation method thereof, a cathode and a lithium ion battery. The cathode material comprises doped lithium nickel cobalt manganate particles, wherein the structural formula of the doped lithium nickel cobalt manganate particles is Li (NixCoyMn1-x-y-p-qM1pM2q)O2, M1 is a metal element comprising Zr and / or Mg, M2 is Al, Ti, La,B, F or Mo, or a combination of two or three or four of them, wherein 0.6<=x<=0.8, 0.1<=y<= 0.2, 0.0006<=p<= 0.0018, 0.0055<=q<=0.013; The ratio of the peak intensity I (003) of the peak (003) and the peak intensity I (104) of the peak (104) of the XRD spectrum of the doped nickel cobalt manganate lithium particles is 1.20<=I (003) / I (104)<= 1.30; The (104) diffraction peak of the doped lithium nickel cobalt manganate particles has a full width at half maximum of 0.22 to 0.25. The cathode material of the lithium ion battery disclosed by the invention has high specific capacity, and also improves the rate performance, cycle performance and safety performance of the cathode material. The method disclosed by the invention has the advantages of small doping amount, simple operation, easy control and low production cost, and is suitable for industrial large-scale production.

Description

technical field [0001] The present disclosure relates to the field of lithium-ion batteries, in particular, to a lithium-ion battery positive electrode material, a preparation method thereof, a positive electrode, and a lithium-ion battery. Background technique [0002] With the shortage of global oil resources and the increasing requirements of environmental protection, the development of new energy has gradually received great attention from governments of various countries. Among them, new energy vehicles are an important part of energy conservation and emission reduction, and countries have spared no effort in their development. Lithium-ion power batteries, as the core components of electric vehicle power systems, have also received more attention. As an important part of lithium-ion power batteries, cathode materials directly determine the electrochemical performance of batteries, so the research on cathode materials is particularly important. [0003] Traditional lith...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/505H01M4/525H01M10/0525
CPCH01M4/131H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 陈玉超程洁张伟周舟王丽萍刘玉玺陈社张敏
Owner WANHUA CHEM GRP CO LTD
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