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Method for preparing lithium battery anode material lithium transition metal composite oxide

A composite oxide, lithium transition metal technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problem of uniform and orderly arrangement of lithium and transition metal atoms, high performance, and inability to synthesize pure phase quaternary lithium transition metal composite oxides and other problems, to achieve the effect of simple preparation method, uniform particle size and low production cost

Inactive Publication Date: 2010-12-15
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a high-performance, low-cost preparation method of lithium-ion battery cathode material lithium transition metal composite oxide, which solves the problem that the traditional dry-mixed solid-phase sintering process cannot synthesize pure-phase quaternary lithium Transition metal composite oxides and improved wet mixing-solid-state sintering cannot bring about the uniform and orderly arrangement of lithium and transition metal atoms

Method used

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  • Method for preparing lithium battery anode material lithium transition metal composite oxide
  • Method for preparing lithium battery anode material lithium transition metal composite oxide
  • Method for preparing lithium battery anode material lithium transition metal composite oxide

Examples

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Effect test

Embodiment 1

[0028] Mix manganese acetate and nickel acetate at a molar ratio of 1:3, perform dry ball milling (100rpm speed, 2h ball milling time, 10:1 ball-to-material ratio), and then place the obtained powder in an air atmosphere at 500°C for roasting 5h, obtain nickel-manganese composite oxide; Then nickel-manganese composite oxide and Lithium Retard are mixed by 4: 9 mol ratio and add dehydrated alcohol and carry out wet ball milling (rotating speed is 100rpm, ball milling time 3h, ball-to-material ratio is 10: 1 ), the powder obtained by drying the slurry at 60°C after ball milling was placed in a furnace, calcined at a constant temperature of 500°C for 5 hours, and then calcined at a constant temperature of 900°C for 20 hours, and cooled rapidly with liquid nitrogen, the positive electrode material Li 1.2 Ni 0.2 mn 0.6 o 2 . The sample has no impurity phase (see attached figure 1 ), stable cycle performance (see attached figure 2 ).

Embodiment 2

[0030] Mix manganese acetate, nickel acetate, and cobalt acetate in a molar ratio of 1:1:1, perform dry ball milling (100rppm speed, 2h ball milling time, 10:1 ball-to-material ratio), and then dry ball mill once to obtain The powder was roasted at 500°C in an air atmosphere for 5 hours to obtain a nickel-manganese composite oxide; then the nickel-manganese-cobalt composite oxide was mixed with lithium carbonate in a molar ratio of 2:3 for dry ball milling (100 rpm, ball milling time 2 hours, ball The material ratio is 10:1), the powder obtained after the second dry ball milling is calcined at a constant temperature of 500°C for 5h, then calcined at a constant temperature of 900°C for 20h, and naturally cooled to room temperature with the furnace, the positive electrode material LiNi 1 / 3 mn 1 / 3 co 1 / 3 o 2 . The sample has no impurity phase (see attached image 3 ), stable cycle performance (see attached Figure 4 ).

Embodiment 3

[0032] Mix manganese acetate and nickel acetate at a molar ratio of 1:3, perform dry ball milling (100rpm speed, 2h ball milling time, 10:1 ball-to-material ratio), and then place the obtained powder in an air atmosphere at 500°C for roasting 5h, obtain nickel-manganese composite oxide; Then nickel-manganese composite oxide and lithium carbonate are mixed by 4: 3 mol ratio and add dehydrated alcohol and carry out wet ball milling (rotating speed is 100rpm, ball milling time 2h, ball-to-material ratio is 10: 1 ); the powder obtained by drying the slurry at 60°C after ball milling was placed in a furnace, calcined at a constant temperature of 500°C for 5 hours, and then calcined at a constant temperature of 900°C for 20 hours, and cooled rapidly with liquid nitrogen to obtain the positive electrode material LiNi 0.5 mn 1.5 o 4 . The sample has no impurity phase (see attached Figure 5 ), stable cycle performance (see attached Figure 6 ).

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Abstract

The invention discloses a method for preparing a lithium battery anode material lithium transition metal composite oxide, which comprises the following steps of: uniformly mixing transition metal mixed M salt and metal doped M' salt in accordance with a stoichiometric proportion in a mechanical mode; calcining at high temperature to form the transition metal composite oxide; performing secondary mechanical mixing on the transition metal composite oxide and the lithium salt; and calcining at high temperature to prepare the lithium transition metal composite oxide. By adopting a secondary mechanical mixing-solid-phase sintering process, the method solves the problems that a pure-phase quaternary lithium transition metal composite oxide cannot be synthesized by the traditional dry mixing solid-phase sintering process, and the improved wet mixing-solid-phase sintering method cannot make lithium and transition metal atoms uniformly and sequentially arranged; the lithium battery anode material lithium transition metal composite oxide has the advantages of no impurity phase, and uniform average grain diameter and excellent cycle performance of the product; and the preparation method has the advantages of simpleness, low production cost and suitability for industrial production.

Description

technical field [0001] The invention belongs to the field of preparation of secondary battery materials, and in particular relates to a preparation method of a lithium transition metal composite oxide for a positive electrode material of a lithium ion battery. Background technique [0002] The development level of chemical power sources has become a symbol of scientific and technological progress and modern needs. The current self-development of chemical power has surpassed any period in history. Small size, light weight, large capacity, high power, no pollution, and long life have become ideal requirements for chemical batteries. Due to the advantages of high output voltage, large specific energy, long cycle life, good safety performance, no pollution, and no memory effect, lithium-ion batteries have become a hot spot in the field of materials for the design, research and development of new lithium-ion battery electrode materials. [0003] Lithium-ion battery cathode mate...

Claims

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Application Information

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IPC IPC(8): H01M4/131
CPCY02E60/122Y02E60/10
Inventor 刘兆平王军姚霞银唐长林张建刚马池周旭峰
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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