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Ultrahigh-capacity lithium ion battery anode material prepared by microwave method and preparation method thereof

A technology for lithium-ion batteries and cathode materials, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of difficult formulation control, long sintering time, irregular particle morphology, etc., achieve excellent electrochemical performance, and improve heat utilization. Efficiency, effect of shortening heat treatment time

Active Publication Date: 2011-05-11
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, this conventional heating method has high synthesis temperature, long sintering time, high energy consumption, low production efficiency, and high material preparation or production cost; a large amount of lithium salt volatilizes during the production process, causing difficulty in formula control; and the heating rate is slow. , resulting in large product particle size and wide particle size range, irregular particle shape, and ultimately the electrochemical performance of the material is not easy to control

Method used

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  • Ultrahigh-capacity lithium ion battery anode material prepared by microwave method and preparation method thereof
  • Ultrahigh-capacity lithium ion battery anode material prepared by microwave method and preparation method thereof
  • Ultrahigh-capacity lithium ion battery anode material prepared by microwave method and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Lithium hydroxide, oxalic acid, nickel acetate, cobalt acetate, and manganese acetate were mixed in a molar ratio of 1.21:2:0.13:0.13:0.54, and dry ball milling was carried out (the speed was 500rppm, the ball milling time was 3h, and the ball-to-material ratio was 10:1 ). Then the obtained powder was sintered in a microwave air atmosphere furnace at a constant temperature of 400°C for 1h, then sintered at a constant temperature of 800°C for 0.5h, and cooled naturally to room temperature to obtain a layered lithium-rich manganese-based oxide Li 1.2 Ni 0.13 co 0.13 mn 0.54 o 2 . Lithium hydroxide, oxalic acid, nickel acetate, cobalt acetate, and manganese acetate were mixed in a molar ratio of 1.21:2:0.13:0.13:0.54, and dry ball milling was carried out (the speed was 500rppm, the ball milling time was 3h, and the ball-to-material ratio was 10:1 ). Then the obtained powder was placed in a resistance heating air atmosphere furnace for constant temperature sintering a...

Embodiment 2

[0023] Lithium hydroxide, oxalic acid, nickel acetate, and manganese acetate were mixed in a molar ratio of 1.21:2:0.2:0.6, and wet ball milled (500rppm speed, 3h ball milling time, 10:1 ball-to-material ratio). Then the obtained powder was sintered in a microwave air atmosphere furnace at a constant temperature of 400°C for 1h, then sintered at a constant temperature of 750°C for 0.5h, and cooled naturally to room temperature to obtain a layered lithium-rich manganese-based oxide Li 1.2 Ni 0.2 mn 0.6 o 2 . The sample has no impurity phase (see attached figure 2 ), uniform particle size distribution (see attached image 3 ), the electrochemical reversible capacity reaches 240mAh / g, and the cycle performance is good.

Embodiment 4

[0025] Lithium carbonate, nickel oxide, and manganese dioxide were mixed in a molar ratio of 0.605:0.2:0.6, and wet ball milled (500rppm rotation speed, 3h ball milling time, 10:1 ball-to-material ratio). Then the obtained powder was sintered in a microwave air atmosphere furnace at a constant temperature of 400°C for 1h, then sintered at a constant temperature of 750°C for 0.5h, and cooled naturally to room temperature to obtain a layered lithium-rich manganese-based oxide Li 1.2 Ni 0.2 mn 0.6 o 2 . The sample has no impurity phase, the electrochemical reversible capacity reaches 230mAh / g, and the cycle performance is good.

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Abstract

The invention discloses an ultrahigh-capacity lithium ion battery anode material prepared by a microwave method and a preparation method thereof. The method comprises the following steps: mechanically or chemically and uniformly mixing the hydroxide, oxide or salt containing lithium with the hydroxide, oxide or salt containing transition metal M, the hydroxide, oxide or salt containing doped metal M' and additives in a certain proportion; and then putting the mixture into an atmosphere furnace, performing heat treatment on the mixture so as to acquire the required laminar materials rich in lithium and manganese oxides. According to the invention, heating with microwave is adopted, thus not only can the heating time is shortened, and the heat use ratio is increased, but also the heat treatment is even, so that the problems of the traditional heating method that the heating is uneven, the heating time is long, the temperature is high and the like are all solved. Besides, the prepared ultrahigh-capacity lithium ion battery cathode material, namely the laminar materials rich in lithium and manganese oxides, contains no impurity phase, and has the characteristics of uniform mean grain size, excellent circulating property and excellent electrochemical performance. The preparing method provided by the invention has the advantages of simple process, low preparation cost, energy conservation, high efficiency 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 layered lithium-rich manganese-based oxide for an ultra-high-capacity lithium-ion battery positive electrode material prepared by a microwave method and a preparation method thereof. Background technique [0002] Lithium-ion battery cathode material is a key component of lithium-ion batteries, its performance determines the performance of lithium-ion batteries, and its price determines the cost of lithium-ion batteries. At present, the positive electrode material on the market is mainly lithium cobalt oxide. However, due to safety issues, only half of the lithium in lithium cobalt oxide can be reversibly extracted and reintercalated during charge and discharge, and the actual specific capacity is 140-150mAh / g, which is about the theoretical capacity (273mAh / g ) of half. In addition, cobalt element is relatively expensive. Therefore, effor...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/1391H01M4/36
CPCY02E60/10
Inventor 刘兆平王军唐长林张建刚
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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