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Method for preparing lithium ion battery cathode material LiMnPO4 through low-temperature solid-phase reaction

A lithium-ion battery, cathode material technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of harsh control conditions, long synthesis cycle, and high synthesis temperature, reducing energy consumption, synthesis cost, and sintering temperature. Effect

Inactive Publication Date: 2012-04-04
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods have some inherent disadvantages, such as: high synthesis temperature, long synthesis cycle, harsh control conditions, high cost, and poor high-current discharge capability of the synthesized materials, which limit the LiMnPO 4 large-scale industrialization of

Method used

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  • Method for preparing lithium ion battery cathode material LiMnPO4 through low-temperature solid-phase reaction
  • Method for preparing lithium ion battery cathode material LiMnPO4 through low-temperature solid-phase reaction
  • Method for preparing lithium ion battery cathode material LiMnPO4 through low-temperature solid-phase reaction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] MnCO 3 , LiCHO 2 , NH 4 H 2 PO 4 And C 2 H 2 O 4 .2H 2 O, mix homogeneously according to the ratio of the amount of substance 1:1:1:1, and mechanically activate for 10h; then put it into a tube furnace, under an argon atmosphere, the temperature is respectively 300℃, 500℃, 600℃, 700 Constant temperature at ℃ for 12h. The heating rate of the furnace is controlled at 20°C / min, and the cooling rate is controlled at 5°C / min. The obtained material has an olivine structure by X-ray diffraction analysis, and the space group is Pnmb, which is the structure of LiMnPO4. The obtained product was assembled into a button battery to measure its charge-discharge specific capacity and cycle performance. The charge and discharge were performed at a rate of 0.05C. The first discharge capacity and the discharge capacity after 30 cycles are shown in Table 1.

[0020] Table 1 Experimental conditions and results of Example 1

[0021]

Embodiment 2

[0023] Mn(NO 3 ) 2 , LiOH, (NH 4 ) 2 HPO 4 And HCHO, according to the material quantity ratio 1:1:1:1, mix homogeneously, and mechanically activate for 5h; then put into the tube furnace, under nitrogen atmosphere, the temperature is constant at 650℃ for 2h, 5h, 8h, 10h respectively . The heating rate of the furnace is controlled at 40℃ / min, and the cooling rate is controlled at 20℃ / min. The obtained material has an olivine structure by X-ray diffraction analysis, and the space group is Pnmb, which is LiMnPO 4 Structure. The obtained product was assembled into a button battery to measure its charge-discharge specific capacity and cycle performance. The charge and discharge were performed at a rate of 0.05C. The first discharge capacity and the discharge capacity after 30 cycles are shown in Table 2.

[0024] Table 2 Experimental conditions and results of Example 2

[0025]

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Abstract

The invention discloses a method for preparing a lithium ion battery cathode material LiMnPO4 through low-temperature solid-phase reaction. The method comprises the following steps of: uniformly mixing a manganese source compound, a phosphorus source compound and a lithium source compound in the molar ratio of manganese to phosphorus to lithium of 1:1:1 at normal temperature; mechanically activating for 1 to 10 hours; adding an organic carbon source, wherein the molar ratio of the organic carbon to the manganese source compound is (1:1)-(2:1); heating to 300 to 800 DEG C at the heating speed of 10 to 40 DEG C per minute in non-oxidizing atmosphere; sintering at the constant temperature for 4 to 12 hours; and reducing the temperature at the speed of 5 to 20 DEG C per minute to obtain LiMnPO4. In the invention, a mangano-compound is directly used as a manganese source, an organic carbon source is added, and LiMnPO4 with stable performance can be prepared at low temperature, so the synthesis condition and cost are reduced, the capacity of the LiMnPO4 prepared by the method is obviously improved, and the LiMnPO4 has good discharge performance.

Description

Technical field [0001] The invention relates to a low-temperature solid-phase reaction to prepare LiMnPO, a cathode material for lithium ion batteries 4 Methods. Background technique [0002] LiMnPO 4 It is a new type of lithium ion battery cathode material. It has excellent charging and discharging platform, good cycle performance, low price, high theoretical capacity, environmental friendliness and other advantages. It is considered to be the most promising cathode material for lithium-ion batteries and is expected to be used in lithium-ion batteries. Electric car. [0003] The traditional preparation methods are mainly as follows: solid phase synthesis method, sol-gel method, co-precipitation method, hydrothermal method and so on. However, these methods have some inherent shortcomings, such as: high synthesis temperature, long synthesis cycle, harsh control conditions, high cost, and poor high-current discharge capability of synthetic materials, which limit LiMnPO 4 Large-scal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58
CPCY02E60/12Y02E60/10
Inventor 钟胜奎徐悦斌姜吉琼王友张鹰鹛
Owner GUILIN UNIVERSITY OF TECHNOLOGY