Li-ion battery positive electrode material with layered-spinel symbiotic structure and preparation method

A technology for lithium-ion batteries and positive electrode materials, applied in electrode manufacturing, battery electrodes, structural parts, etc., can solve the problems of lack of cobalt resources and expensive materials, and achieve the solution of lack of cobalt resources, high capacity and cycle performance, and cost reduction Effect

Inactive Publication Date: 2009-06-03
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The object of the present invention is to provide a kind of preparation method of layered-spinel symbiotic structure lithium-ion battery anode material, produce cycle performance and capacity and current LiCoO 2 Equivalent,

Method used

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  • Li-ion battery positive electrode material with layered-spinel symbiotic structure and preparation method
  • Li-ion battery positive electrode material with layered-spinel symbiotic structure and preparation method
  • Li-ion battery positive electrode material with layered-spinel symbiotic structure and preparation method

Examples

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Example Embodiment

[0049] Example 1:

[0050] The product composition was designed with the mole ratio of Co, Ni, Mn = 0.2:0.2:0.6.

[0051] Material preparation: (x is a common coefficient in this example.) First, 0.4xmol of MnSO 4 .H 2 O is formulated into 2mol / L MnSO 4 solution, and then weigh 0.8x mol of NaOH to prepare a 2mol / L NaOH solution for the first precipitation. Weigh again 0.2x mol of CoSO 4 .7H 2 O, 0.2x mol NiSO 4 .6H 2 O and 0.2x mol of MnSO 4 .H 2 O was prepared into a mixed solution of 2 mol / L (Co+Ni+Mn); 1.2× mol of NaOH was weighed to prepare a 2 mol / L NaOH solution, which was used for the second co-precipitation. The complexing agent adopts ammonia water with a concentration of 0.36 mol / L.

[0052] making process:

[0053] First, add an appropriate amount of deionized water as the bottom liquid of the precipitation reaction in the reaction kettle, drop an appropriate amount of ammonia water and NaOH mixed solution to adjust the pH value of the bottom liquid to 10...

Example Embodiment

[0059] Example 2:

[0060] The product composition was designed with the mole ratio of Co, Ni, Mn = 0.1:0.1:0.8.

[0061] Material preparation: (x is a common coefficient in this example.) First, 0.7x mol of MnSO 4 .H 2 O is configured as 2mol / L MnSO 4 solution; then weigh 0.14xmol of NaOH to prepare a 2mol / L NaOH solution for the first precipitation. Weigh again 0.1xmol of CoSO 4 .7H 2 O, 0.1x mol NiSO 4 .6H 2 O and 0.1xmol of MnSO 4 .H 2 O was prepared into a mixed solution of 2 mol / L (Co+Ni+Mn); 0.6× mol of NaOH was weighed to prepare a 2 mol / L NaOH solution, which was used for the second step of co-precipitation. The concentration of complexing agent ammonia water is 0.48mol / L.

[0062] making process:

[0063] First, an appropriate amount of deionized water was added to the reaction kettle as the bottom liquid of the precipitation reaction, and an appropriate amount of ammonia water and NaOH solution were added dropwise to adjust the pH value of the bottom liqu...

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Abstract

A preparation method for a Li-ion battery positive electrode material with layered-spinel symbiotic structure comprises the following steps: (a) synthesizing Mn(OH)2 particle, which is the precursor of Li2MnO4 with spinel structure by chemical coprecipitation method; (b) synthesizing (Ni1/3Co1/3Mn1/3)(OH)2 particle by chemical coprecipitation method using the Mn(OH)2 particle as nucleater, wherein the Mn(OH)2 particle synthesized in step (a) is gradually wrapped by the (Ni1/3Co1/3Mn1/3)(OH)2 particle; (c) washing the precipitate to remove alkali metal ions and acid radical ions in the precipitate and drying; and (d) uniformly mixing the mixed NiCoMn hydrate particle with a Li compound, calcining, and cooling to obtain the final product. The method can greatly improve the Mn content in the positive electrode material with NiCoMn ternary system, and keep higher capacity and cycle performance of the positive electrode material, thereby effectively lowering the cost.

Description

technical field [0001] The invention relates to a novel positive electrode material of a lithium ion battery, in particular to a lithium nickel cobalt manganese oxide material, which belongs to the field of energy storage materials. Background technique [0002] Lithium cobalt oxide material, as the first generation of commercial lithium-ion battery cathode material, has many advantages such as simple preparation process, stable structure, high energy density, good cycle performance, high and relatively stable voltage platform, etc. It is currently the most mature The positive electrode material cannot be completely replaced by other system materials in a short period of time, especially in the field of communication batteries. However, the shortage of cobalt resources, expensive materials, poor safety and other defects make it necessary to develop corresponding alternative materials. [0003] Now there are two directions to replace lithium cobalt oxide materials. One is in...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/48H01M4/58
CPCY02E60/12Y02E60/10
Inventor 赵世玺冯玉川南策文刘华丽
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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