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Gradient distribution multivariate composite material precursor as well as preparation method and application thereof

A technology of gradient distribution and precursors, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of discharge specific capacity, stability, rate and safety performance to be improved, so as to improve electrical conductivity and battery rate performance, The effect of high specific capacity and high discharge specific capacity

Active Publication Date: 2013-10-23
SUZHOU GCL ENERGY TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The core part and the multi-layer outer shell part are enriched with different components, so that the core and the shell can achieve functional recombination and complementarity. Compared with the existing ternary positive electrode materials, the discharge specific capacity, cycle stability, thermal stability and The safety performance has been improved, but the specific discharge capacity, stability, rate and safety performance of the material still need to be improved

Method used

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  • Gradient distribution multivariate composite material precursor as well as preparation method and application thereof
  • Gradient distribution multivariate composite material precursor as well as preparation method and application thereof
  • Gradient distribution multivariate composite material precursor as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] First prepare the salt solution A of the material core: nickel sulfate, cobalt sulfate, manganese sulfate, magnesium sulfate in molar ratio (78%: 10%: 10%: 2%) to prepare a salt solution with a concentration of 2mol / L. Other salt solution B, C, D, E are respectively by nickel sulfate, cobalt sulfate, manganese sulfate, magnesium sulfate molar ratio: B (58%: 20%: 20%: 2%); C (50%: 25%: 25%); D (38%: 30%: 30%: 2%); E (32.7%: 32.7%: 32.7%: 2%), the nickel content of the salt solution gradually decreased.

[0037] The salt solution A was injected into the reactor at a speed of 0.4 L / h through a metering pump with a rotation speed of 400 rps, and the temperature of the reactor was kept at 50°C. At the same time, inject the NaOH solution with a mass percentage concentration of 15-25% ammonia water and 8-12mol / L, pay attention to adjust the flow rate of the alkali solution, and keep the pH value between 9-12 through the online pH tester; after the salt solution A is completely...

Embodiment 2

[0046] As shown in Table 1, first prepare the salt solution A of the material core: nickel sulfate, cobalt sulfate, manganese sulfate, and zinc sulfate are prepared in molar ratios (69%: 15%: 15%: 1%) with a concentration of 2mol / L. saline solution. Other salt solution B, C, D, E are respectively by nickel sulfate, cobalt sulfate, manganese sulfate, zinc sulfate molar ratio: B (59%: 20%: 20%: 1%); C (49%: 25%: 25%: 1%); D (39%: 30%: 30%: 1%); E (33%: 33%: 33%: 1%). The nickel content of the brine gradually decreases.

[0047] The preparation process was the same as in Example 1. The tap density, initial discharge capacity, capacity retention rate of 60 cycles at room temperature, and capacity retention rate after 20 cycles at a high temperature of 50°C are shown in Table 2.

Embodiment 3

[0049] As shown in Table 1, first prepare the salt solution A of the core of the material: nickel sulfate, cobalt sulfate, manganese sulfate, aluminum sulfate are prepared in molar ratio (67%: 15%: 15%: 3%) with a concentration of 2mol / L saline solution. Other salt solution B, C, D, E are respectively by nickel sulfate, cobalt sulfate, manganese sulfate, aluminum sulfate molar ratio: B (57%: 20%: 20%: 3%); C (47%: 25%: 25%: 3%); D (37%: 30%: 30%: 3%); E (32.3%: 32.3%: 32.3%: 3%). The nickel content of the brine gradually decreases.

[0050] The preparation process was the same as in Example 1. The tap density, initial discharge capacity, capacity retention rate of 60 cycles at room temperature, and capacity retention rate after 20 cycles at a high temperature of 50°C are shown in Table 2.

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Abstract

The invention relates to a gradient distribution multivariate composite material precursor as well as a preparation method of the gradient distribution multivariate composite material precursor and an application in preparation of a lithium ion battery anode material. The precursor is prepared from the following molecular formula: NixCoyMnzM1-x-y-z(OH)2, wherein x is more than 0.2 and less than 0.8, y is more than 0.1 and less than 0.5, z is more than 0 and less than 0.6, and M is a doped metal ion and comprises one or more of Mg, Ca, Zn, Al, Cr, Zr and Ti; the precursor comprises a core part and an outer layer shell part in which multiple layers are sequentially covered in the core; a molecular formula composition of the core part is NikConMnmM1-k-n-m(OH)2, wherein k is more than 0.5 and less than 1, n is more than 0.05 and less than 0.5, and m is more than 0 and less than 0.6; and the outer layer shell part is used for controlling the proportion of the raw material components and a preparation process to ensure that the material composition of the outer layer shell part is distributed in a gradient mode. Compared with a ternary material with a uniform internal structure, the lithium ion battery anode material has the advantages that the high specific discharge capacity is developed; and meanwhile, the cycling stability, the high-temperature cycling stability and the rate capability of the materials also can be greatly improved.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery cathode materials, and in particular relates to a gradient-distributed composite multi-element cathode material precursor for lithium-ion batteries, a preparation method thereof, and an application in preparing lithium-ion battery cathode materials. Background technique [0002] Lithium-ion secondary batteries have rapidly developed into products with high specific energy and long cycle life since Sony’s application in the market in 1991, and have gradually replaced nickel-cadmium and nickel-metal hydride batteries, becoming an ideal power source for various portable electronic products . The advantages of nickel-cobalt-manganese ternary lithium-ion battery cathode materials: the precursor of nickel-cobalt-manganese lithium manganate cathode material is nickel salt, cobalt salt, and manganese salt as raw materials, and the proportion of nickel-cobalt-manganese can be adjusted according...

Claims

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Application Information

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IPC IPC(8): H01M4/131H01M4/525H01M4/505H01M4/1391
CPCY02E60/122Y02E60/10
Inventor 柳俊鲁勇生谢松
Owner SUZHOU GCL ENERGY TECH DEV CO LTD
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