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Positive material for lithium ion battery and its preparation method

A lithium-ion battery, cathode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of insignificant improvement in thermal stability and capacity, reduction in material specific capacity, and reduction in initial discharge capacity, etc. Good performance and thermal stability, easy industrial production, and the effect of inhibiting the expansion of the lattice

Active Publication Date: 2012-02-01
BEIJING EASPRING MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The modification methods are divided into two types: doping and coating: for large-grained lithium cobalt oxide, element doping alone can increase the specific charge-discharge capacity of the material for the first time, but it has no effect on improving the cycle performance and thermal stability of the material. But it is not obvious; according to the different properties of the coating agent, the coating of a single element has two effects: one is equivalent to homogeneous doping, which is relatively uniformly distributed inside and on the surface of the particle, which can improve the first time of the material. Charge-discharge specific capacity, but has no effect on the cycle performance and thermal stability of the material; a modifier equivalent to gradient doping, particle surface avoids LiCoO 2 The direct contact with the electrolyte inhibits the lattice expansion during the cycle, improves the cycle performance and thermal stability of the material, but leads to a decrease in the specific capacity of the material
Chinese patent CN0214607.1 discloses a modified lithium cobalt oxide material coated with a single element. The prepared lithium-ion battery only improves cycle performance, but the improvement in thermal stability and capacity is not obvious
Chinese patent CN200710060049.6 discloses zirconium and phosphorus doped lithium cobaltate and its preparation method, the cycle performance is improved, but the first discharge capacity is reduced
In summary, it is difficult for lithium cobalt oxide materials prepared by doping and coating with a single element to meet the requirements of small lithium battery high-end customers for capacity, cycle performance and thermal stability at the same time.

Method used

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  • Positive material for lithium ion battery and its preparation method
  • Positive material for lithium ion battery and its preparation method
  • Positive material for lithium ion battery and its preparation method

Examples

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Effect test

Embodiment 1

[0029] Lithium carbonate and cobalt oxyhydroxide with a Li:Co molar ratio of 1.04:1 were mixed for 6 hours, sintered at 700°C for 14 hours, cooled to room temperature, crushed and sieved to obtain the precursor.

[0030] The precursor, MnO with a molar ratio of 1:0.01:0.005 2 、Al 2 o 3 Mix for 4 hours, sinter at 900°C for 6 hours, cool to room temperature, crush and sieve to obtain the modified lithium cobaltate material, such as figure 1 As shown, the particle size of the primary particle is about 12-25 μm, and the electrical properties of the product are shown in Table 1.

Embodiment 2

[0032] Lithium hydroxide, cobalt oxalate, and manganese dioxide with a molar ratio of Li:Co:Mn of 0.95:1:0.02 were mixed for 5 hours, sintered at 1200°C for 14 hours, cooled to room temperature, crushed and sieved to obtain the precursor.

[0033] The precursor, ZrO with a molar ratio of 1:0.001:0.05 2 、K 2 C 2 o 4 ·H 2 O mixed for 4 hours, sintered at 300°C for 6 hours, cooled to room temperature, crushed and sieved to obtain the modified lithium cobaltate material.

Embodiment 3

[0035] Lithium carbonate, cobalt tetroxide, and boron pentoxide with a molar ratio of Li:Co:B of 1.08:1:0.05 were mixed for 8 hours, sintered at 1000°C for 14 hours, cooled to room temperature, crushed and sieved to obtain the precursor.

[0036] The precursor, Y with a molar ratio of 1:0.005:0.01 2 o 3 , Mg(OH) 2 Mix for 4 hours, sinter at 900°C for 6 hours, cool to room temperature, crush and sieve to obtain the modified lithium cobalt oxide material. The particle size of the primary particles is about 12-18um.

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Abstract

The invention discloses a positive material for a lithium ion battery and its preparation method, concretely relates to a modified cobalt acid lithium material and its preparation method, and relates to a lithium ion battery containing the material. The general formula of the material is LiMxLyNwCozO2, wherein 0.001<=x<=0.1, 0.005<=y<=0,05, 0<=w<=0.05, 1-x-y-w<=z<=1, M is one or more transition metals selected from Mn, Ni, Ti, Zr, Cr, Fe, Cu, Zn, Y, Ce, Sm, Pr, La, Mo or Nb and the like, L is one or more main group metal elements selected from Na, K, Ca, Mg, Sr, Ba, B, Ga, Sn, Sb, Bi or Al and the like; N is one or more of Li, Mn, Ni, Zr, Ti, Y, Ce, Sm, Mo, Nb, Na, K, Ca, Mg, Sr, Ba, B or Al. The material has the advantages of high specific capacity, excellent cycle performance and heat stability, simple preparation method and easy industrialization production.

Description

technical field [0001] The invention relates to a lithium ion battery cathode material and a preparation method thereof, in particular to a modified lithium cobaltate material and a preparation method thereof. [0002] The invention also relates to a lithium ion battery containing the material. Background technique [0003] Compared with traditional green secondary batteries, lithium-ion batteries have the advantages of high working voltage, small size, high specific energy, light weight, no memory effect, small self-discharge, less pollution, and long life. Lithium-ion secondary batteries occupy a dominant position in the field of small batteries such as notebook computers, mobile phones, video cameras, digital cameras, and weapons and equipment due to their excellent high performance and price ratio, and have considerable market sales. [0004] Layered Lithium Cobalt Oxide LiCoO 2 With the advantages of high voltage (3.6V), stable discharge, high specific capacity (about...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/131H01M4/1391H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 陈彦彬于微魏媛媛刘亚飞
Owner BEIJING EASPRING MATERIAL TECH CO LTD
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