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A uniformly modified porous cathode material with controllable surface structure and preparation method thereof

A technology of surface structure and cathode material, applied in the field of preparation of new energy materials, can solve the problems of uneven surface modification and uneven modification of porous cathode materials, improve high-temperature cycle performance and thermal stability, and suppress interfacial side reactions. , Solve the effect of doping uniformity

Active Publication Date: 2015-10-14
QINGHAI TAIFENG XIANXING LITHIUM ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem of uneven surface modification of porous positive electrode materials, especially the uneven surface modification of internal primary particles, the present invention prepares uniformly modified internal and external particles and controllable surface structure through controllable step-by-step precipitation uniform doping technology Porous cathode material, which greatly improves the high-temperature cycle performance and thermal stability of porous cathode materials under high cut-off voltage

Method used

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  • A uniformly modified porous cathode material with controllable surface structure and preparation method thereof
  • A uniformly modified porous cathode material with controllable surface structure and preparation method thereof
  • A uniformly modified porous cathode material with controllable surface structure and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0037] The total concentration of the prepared solution is 2mol / L NiSO 4 、CoSO 4 , MnSO 4 The mixture liquid, where n （Ni） :n （Co） :n （Mn） =5:2:3, then in N 2 4mol / L NaOH and 1mol / L NH 3 ·H 2 The mixed lye of O and the above mixed material liquid are added to the reaction kettle equipped with deionized water at the same time, the flow rate of the lye is adjusted to make the reaction solution pH=10.5, the reaction temperature is controlled at 50 ° C and kept stirring, when the remaining reaction material liquid When the volume is 90% of the volume of the starting material, start adding Al with a concentration of 0.02M 2 (SO 4 ) 3 After the reaction, filter and wash and dry at 100°C to obtain a porous hydroxide precursor A1 with uniform surface aluminum modification (such as figure 1 shown); take precursor A140g, and 16.9gLi 2 CO 3 After mixing, carry out primary sintering at a temperature of 920°C and keep it warm for 20 hours to obtain a primary sintering product B...

Embodiment 2

[0039] The total concentration of the prepared solution is 2mol / L NiSO 4 、CoSO 4 , MnSO 4 The mixture liquid, where n (Ni） :n （Co） :n (Mn） =5:2:3, then in N 2 4mol / L NaOH and 1mol / L NH 3 ·H 2 The mixed lye of O and the above mixed material liquid are added to the reaction kettle equipped with deionized water at the same time, the flow rate of the lye is adjusted to make the reaction solution pH=10.5, the reaction temperature is controlled at 50 ° C and kept stirring, when the remaining reaction material liquid When the volume is 60% of the volume of the starting material, start adding Al with a concentration of 0.02M 2 (SO 4 ) 3 Aqueous solution, filtered and washed after the reaction and dried at 100°C to obtain porous hydroxide precursor A2 with uniform surface aluminum modification; take 240g of precursor A, and 16.9g Li 2 CO 3 After mixing, carry out primary sintering, the sintering temperature is 920°C, keep warm for 20 hours, and obtain the primary sintering p...

Embodiment 3

[0041] The total concentration of the prepared solution is 2mol / L NiSO 4 、CoSO 4 , MnSO 4 The mixture liquid, where n （Ni） :n （Co） :n （Mn） =5:2:3, then in N 2 4mol / L NaOH and 1mol / L NH 3 ·H 2 The mixed lye of O and the above mixed material liquid are added to the reaction kettle equipped with deionized water at the same time, the flow rate of the lye is adjusted to make the reaction solution pH=10.5, the reaction temperature is controlled at 50 ° C and kept stirring, when the remaining reaction material liquid When the volume is 30% of the volume of the starting material, start adding Al with a concentration of 0.02M 2 (SO 4 ) 3 Aqueous solution, filtered and washed after the reaction and dried at 100°C to obtain porous hydroxide precursor A3 with uniform surface aluminum modification; take 340g of precursor A, and 16.9g Li 2 CO 3 After mixing, carry out primary sintering, the sintering temperature is 920°C, and keep warm for 20 hours to obtain the primary sintering...

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Abstract

The invention discloses a uniform modified multihole anode material with controllable surface structures and a preparation method of the uniform modified multihole anode material. The uniform modified multihole anode material with different surface structures is prepared by introducing modified metal ions in different stages of synthesis of a precursor and changing reaction conditions. The uniform modified multihole anode material is coated by utilizing organic phase nano metal hydroxide sol to obtain the multihole anode material with uniform and modified internal particle surface and external particle surface. Compared with prior art, the multihole anode material prepared by the invention has the controllable surface structures of the internal particles and the external particles, and therefore, the problem of nonuniform modification of the surfaces of the particles, especially the internal particles of the multihole anode material is solved fundamentally, the high-voltage high-temperature cycling performance and the heat stability of the multihole anode material are improved greatly, and the uniform modified multihole anode material can be applied to electric tools such as high-energy density type consumer electronics, electric cars, and the like.

Description

technical field [0001] The invention relates to the technical field of preparation of new energy materials, in particular to the preparation of a cathode material for a lithium ion battery. Background technique [0002] The current portable electronic products, especially the increasingly popular smart phones, have higher and higher requirements for battery energy density, and increasing the charge cut-off voltage is the most direct and effective means to further increase the energy density without changing the positive electrode; cobalt As the most mature lithium battery cathode material at present, Lithium Oxide has a theoretical capacity of 274mAh / g, but deep discharge will cause the structure to collapse. 2 In general, nickel is the main electrochemically active substance, cobalt can reduce the electrochemical polarization of the material and increase the rate, manganese can improve the structural stability and thermal stability, so the synergistic effect of two or three...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/525H01M4/505
CPCY02E60/122Y02E60/10
Inventor 向德波周恒辉王峰郭晓丰韩坤明黄震雷杨新河魏伟李金秀娄有信
Owner QINGHAI TAIFENG XIANXING LITHIUM ENERGY TECH CO LTD
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