Lithium manganese phosphate chloride electrode material and preparation method thereof

A technology of lithium manganese chlorophosphate and electrode material, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems of poor low temperature performance, low energy density, poor high-power charge and discharge performance, etc., and improve the charge and discharge rate. , the effect of increasing the charge and discharge capacity

Inactive Publication Date: 2016-02-17
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are also disadvantages such as poor low-temperature performance, poor high-power charging and discharging performance, and low energy density, so it cannot be used as an energy storage material for high-power electrical appliances such as electric vehicles.

Method used

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Experimental program
Comparison scheme
Effect test

preparation example Construction

[0015] The steps of the preparation method of lithium manganous chlorophosphate electrode material are as follows:

[0016] 1) Mix the manganese source, phosphorus source, lithium source and anion source according to the stoichiometric ratio given by the molecular formula, and add a carbon source equivalent to 0.1% to 1% of the total weight of the manganese source, phosphorus source, and lithium source. Water that is 3 to 5 times the total weight of raw materials is ball milled for 1 to 3 hours to make a uniform slurry. After the raw materials are mixed, an intermediate product is formed, which is the precursor of the final product. During the grinding process, the precursor and the solution form a homogeneous mixed phase.

[0017] The manganese source is one or more of divalent manganese oxides, hydroxides and salt compounds; the phosphorus source is one of ammonium hydrogen phosphate and diammonium hydrogen phosphate; the The lithium source is one or several kinds of lithiu...

Embodiment 1

[0031] 1) Weigh 19.67Kg of manganese acetate, 10.57Kg of diammonium hydrogen phosphate, 5.28Kg of lithium acetate, and 3.39Kg of lithium chloride, add 100L of water and 0.2 kg of glucose, stir evenly, pour into a ball mill, and mill for 1 hour.

[0032] 2) The pulp obtained from ball milling is spray-dried at 150°C to obtain dry powder with uniform particle size.

[0033] 3) Press the powder into a cylindrical shape with a compression die, put it into a closed calciner, calcinate at 550°C for 6 hours in a vacuum environment, and cool to room temperature to obtain lithium manganous phosphate chloride.

Embodiment 2

[0035] 1) Weigh 5.68Kg of MnO, 10.57Kg of diammonium hydrogen phosphate, 5.28Kg of lithium acetate, and 2.07Kg of lithium fluoride, add 80L of water, 0.25kg of citric acid, stir evenly, pour into a ball mill, and mill for 2 hours.

[0036] 2) The pulp obtained by ball milling is spray-dried at 260°C to obtain dry powder with uniform particle size.

[0037] 3) Press the powder into a cylindrical shape with a compression die, put it into a closed calciner, calcinate at 850°C for 2 hours in a vacuum environment, and cool to room temperature to obtain lithium manganous fluorophosphate.

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PUM

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Abstract

The invention discloses a lithium manganese phosphate chloride electrode material and a preparation method thereof. The electrode material is particles having the particle grade from nanometer to sub-micron, having the surface coated with a carbon membrane and having the chemical formula of Li2MnPO4.A, wherein in the formula, Mn is bivalent, and A is one or more of F<->, Cl<-> and OH<->. The lithium battery electrode material is prepared by a solid phase reaction method. The preparation method comprises the steps: mixing uniformly a manganese source, a phosphorus source, a lithium source, carbonic acid and an anion source according to the stoichiometric ratio, carrying out wet ball milling and carrying out spray drying, calcining and cooling under the protection of an inert gas, and thus obtaining the lithium manganese phosphate chloride electrode material. Organic acid radicals contained in the raw materials can avoid manganese from being oxidized during calcination. The lithium manganese phosphate chloride provided by the invention has the charge and discharge capacity, the charge and discharge rate and other properties obviously superior to those of conventional lithium iron phosphate, and provides a safeguard for energy storage of high-power electric appliances.

Description

Technical field [0001] The present invention involves a lithium manganese -lithium electrode material and its preparation methods. Background technique [0002] Phosphoric acid (Asian) lithium is currently the most widely used lithium battery electrode material. Compared with other types of lithium battery electrode materials, it has high safety, long service life, good high temperature performance, no memory effect, light weight, environmental protection, environmental protectionEtc.However, there are also disadvantages such as poor low temperature performance, poor high -power charging and discharge performance, and low energy density. Therefore, it is currently not available as a storage material for high -power electrical appliances such as electric vehicles. [0003] The invention attempts to provide a lithium battery electrode material higher than the lithium metal phosphate. Invention content [0004] The purpose of the present invention is to provide a manganese lithium ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M10/0525
CPCH01M4/5825H01M10/0525Y02E60/10
Inventor 叶瑛夏天朱健敏程继鹏秦文莉赵玥夏枚生张平萍陈雪刚
Owner ZHEJIANG UNIV
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