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Lithium manganate based lithium ion battery positive electrode material as well as preparation method thereof

A technology for ion batteries and cathode materials, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as poor high temperature performance, fast cycle attenuation, and low volume capacity, so as to improve cycle performance and high temperature performance, and increase volume capacity , the effect of high capacity

Active Publication Date: 2014-05-14
NANTONG RESHINE NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to its own shortcomings, such as low volume capacity, fast cycle attenuation, and poor high-temperature performance, lithium manganate restricts the development of this material.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The invention relates to a lithium manganate-based lithium ion battery positive electrode material. The lithium manganate-based lithium ion battery positive electrode material mixes modified lithium manganate with different particle sizes, and then undergoes surface modification to obtain a lithium manganate finished product.

[0027] A preparation method of a lithium manganate-based lithium ion battery cathode material, specifically comprising the steps of:

[0028] (1) Preparation of lithium manganate material A containing dopant M with D50 less than 30 microns: mixing manganese source material, lithium source material and dopant M according to a certain ratio, the mixing method is dry mixing, wherein Li, The molar ratio of Mn is 0.46, and the dosage of dopant M is 0.01 wt% of substance A; the uniformly mixed material is sintered, the main temperature of sintering is controlled at 500°C, and the sintering time in the main temperature zone is 5 h, the whole sintering pr...

Embodiment 2

[0034] The invention relates to a lithium manganate-based lithium ion battery positive electrode material. The lithium manganate-based lithium ion battery positive electrode material mixes modified lithium manganate with different particle sizes, and then undergoes surface modification to obtain a lithium manganate finished product.

[0035] A preparation method of a lithium manganate-based lithium ion battery cathode material, specifically comprising the steps of:

[0036] (1) Preparation of lithium manganate material A containing dopant M with D50 less than 30 microns: mixing manganese source material, lithium source material and dopant M according to a certain ratio, the mixing method is wet mixing, wherein Li, Mn The molar ratio of dopant M is 0.65, and the dosage of dopant M is 10 wt% of substance A; the uniformly mixed material is sintered, the main temperature of sintering is controlled at 1250°C, and the sintering time in the main temperature zone is 45 h. The whole sin...

Embodiment 3

[0042] The invention relates to a lithium manganate-based lithium ion battery positive electrode material. The lithium manganate-based lithium ion battery positive electrode material mixes modified lithium manganate with different particle sizes, and then undergoes surface modification to obtain a lithium manganate finished product.

[0043] A preparation method of a lithium manganate-based lithium ion battery cathode material, specifically comprising the steps of:

[0044] (1) Preparation of lithium manganate material A containing dopant M with D50 less than 30 microns: mixing manganese source material, lithium source material and dopant M according to a certain ratio, the mixing method is dry mixing, wherein Li, The molar ratio of Mn is 0.55, and the doping amount of dopant M is 7 wt% of substance A; the uniformly mixed material is sintered, the main temperature of sintering is controlled at 850 °C, and the sintering time in the main temperature zone is 35 h, the whole sinter...

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PUM

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Abstract

The invention discloses a lithium manganate based lithium ion battery positive electrode material as well as a preparation method thereof. The lithium manganate based lithium ion battery positive electrode material is prepared by mixing modified lithium manganate with different particle sizes, and carrying out surface modification so as to obtain lithium manganate finished products. According to the invention, the volume capacity of the lithium manganate material is improved by mixing lithium manganate with different particle sizes so as to realize high density and high capacity; the structual stability of the lithium manganate based material is realized by surface treatment of doping vario-property, or coating and the like, and the cycle performance and the high-temperature performance of the material are improved.

Description

technical field [0001] The invention relates to a lithium ion battery cathode material and its preparation, in particular to a high-density lithium manganate-based cathode material and a preparation method thereof. Background technique [0002] With the rapid development of science and technology, the development and application of lithium-ion batteries are becoming more and more extensive, and the requirements for lithium-ion batteries must be gradually increased accordingly. Because lithium manganese oxide has the advantages of good safety performance, good overcharge resistance, superior high-current charge and discharge performance, and environmental friendliness, as well as abundant manganese resources and low price, lithium manganate has become one of the preferred materials for power lithium-ion batteries. one. However, due to its own shortcomings, such as low volume capacity, fast cycle attenuation, and poor high-temperature performance, lithium manganate restricts ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/1391H01M4/62
CPCH01M4/505H01M4/62Y02E60/10
Inventor 李兴翠池田一崇王剑锋陈静波许国干周罗成
Owner NANTONG RESHINE NEW MATERIAL
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