Positive electrode material LiMn1-xFexPO4 / C and preparation method thereof

A cathode material, lithium source technology, applied in the field of lithium ion secondary batteries, can solve the problems of unstable manganese source batches, difficult calculation of metering ratios, complicated feeding, etc., and achieves easy to achieve large-scale production and high process controllability. , the effect of simplifying the process

Inactive Publication Date: 2016-06-22
BYD CO LTD
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  • Application Information

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Problems solved by technology

[0006] The invention solves the technical problems of unstable manganese source batches, difficult calculation of metering ratio and complicated feeding in the preparation of lithium manganese iron phosphate (LMFP) positive electrode materials by direct solid-phase co-firing of all raw materials in the prior art, and provides A Novel Cathode Material LiMn 1-x Fe x PO 4 The preparation method of / C and the cathode material LiMn obtained by this preparation method 1-x Fe x PO 4 / C

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  • Positive electrode material LiMn1-xFexPO4 / C and preparation method thereof
  • Positive electrode material LiMn1-xFexPO4 / C and preparation method thereof
  • Positive electrode material LiMn1-xFexPO4 / C and preparation method thereof

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preparation example Construction

[0040] Through the preparation method provided by the invention, the positive electrode material LiMn can be prepared 1-x Fe x PO 4 / C. Compared with the traditional high-temperature solid-phase method, the preparation method provided by the invention is easy to operate, has high process controllability, and is easy to realize large-scale production.

[0041] Simultaneously, the present invention also provides a kind of cathode material LiMn 1-x Fe x PO 4 / C, the cathode material LiMn 1-x Fe x PO 4 / C is prepared by the preparation method provided by the present invention. The LiMn prepared by the aforementioned preparation method 1-x Fe x PO 4 The / C positive electrode material has high charge and discharge capacity, stable performance, long cycle life, and good electrochemical performance. It is the preferred material for power batteries that require particularly high consistency of materials.

Embodiment 1

[0044] Weigh MnCO according to the molar ratio Mn:Fe:P=0.85:0.15:1 3 、FePO 4 2H 2 O, phosphoric acid as raw material. MnCO 3 After shearing and dispersing, add it to phosphoric acid diluted to a certain degree, and add FePO after reacting for 15 minutes 4 , wet ball milling for 3 hours, spray drying to obtain a solid powder, put the solid powder into a saggar, and heat it up to 700°C for 6 hours at a rate of 3°C per minute in an air atmosphere to obtain the source A of this example. , denoted as A1.

[0045] Carry out XRD test to A1, show that A1 is pure ferromanganous pyrophosphate.

[0046] Take 142.05g of the aforementioned A source A1, 26.14g of lithium carbonate, and 17.93g of glucose, use deionized water as the medium for wet ball milling for 3 hours, spray dry, and then transfer the solid powder into an atmosphere furnace under the protection of nitrogen, at a temperature of 3°C per minute After the temperature reaches 700°C, it is roasted at a constant temperatur...

Embodiment 2

[0048] Weigh MnCO according to the molar ratio Mn:Fe:P=0.65:0.35:1 3 、FePO 4 2H 2 O, phosphoric acid as raw material. MnCO 3 After shearing and dispersing, add it to phosphoric acid diluted to a certain degree, and add FePO after reacting for 15 minutes 4 , wet ball milling for 3 hours, spray drying to obtain a solid powder, put the solid powder into a saggar, and heat it up to 700°C for 6 hours at a rate of 3°C per minute in an air atmosphere to obtain the source A of this example. , recorded as A2.

[0049] Carry out XRD test to A2, show that A2 is pure ferromanganous pyrophosphate.

[0050] Take 142.23g of the aforementioned A source A2, 26.14g of lithium carbonate, and 17.93g of glucose, and use deionized water as the medium for wet ball milling for 2 hours, spray dry, and then transfer the solid powder into an atmosphere furnace under the protection of nitrogen, at a temperature of 3°C per minute. After the temperature reaches 700°C, it is roasted at a constant temp...

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Abstract

The present invention provides a preparation method of a positive electrode material LiMn1-xFexPO4 / C, the method comprises mixing of an A source with a lithium source and a carbon source for reaction to obtain the positive electrode material LiMn1-xFexPO4 / C, and the molar stoichiometric ratio of manganese, iron, phosphorus contained in the A source is Mn: Fe: P = 0.45-0.85: 0.55-0.15: 1. The preparation method is simple, safe in operation, low in cost, and easy in implementation of large-scale production; and a lithium battery positive electrode material prepared by the method has high charge and discharge capacity and stable performance, and is a preferred material for a power battery.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion secondary batteries, in particular to a positive electrode material LiMn 1-x Fe x PO 4 The preparation method of / C and the cathode material LiMn obtained by this preparation method 1-x Fe x PO 4 / C. Background technique [0002] With the consumption of chemical fuels, energy problems are becoming more and more prominent, and people are looking for new alternative energy sources. Lithium-ion batteries have attracted widespread attention due to their advantages such as high voltage, large specific energy, no memory effect, good safety performance, and fast charging and discharging. In addition to being widely used in digital electronic products such as mobile phones, notebook computers and digital cameras, lithium-ion batteries have also begun to be used in fields such as electric vehicles, power tools, aerospace, artificial satellites and military communication equipment. [0003] Lithi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/62C01B25/45
CPCY02E60/10
Inventor 易敏徐茶清
Owner BYD CO LTD
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