Lithium cell positive electrode materials and preparing method thereof

A technology for positive electrode materials and lithium batteries, applied in electrode manufacturing, battery electrodes, positive electrodes, etc., can solve problems that affect the energy density of materials, are not suitable for large-scale industrial production, and the method of adding trace elements is complicated.

Inactive Publication Date: 2003-11-19
徐瑞松
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the method of adding trace elements mentioned in this article is more complicated, the price of trace elements is more expensive, and it is not suitable for large-scale industrial production
In addition, lithium iron phosphate LiFePO 4 There is still room for further improvement of the room temperature conductivity; lithium iron phosphate LiFePO 4 The discharge voltage of the lithium battery is lower than that of the three lithium intercalation oxides commonly used in lithium batteries, which affects the energy density of the material

Method used

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  • Lithium cell positive electrode materials and preparing method thereof
  • Lithium cell positive electrode materials and preparing method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0062] Embodiment 1: the polycrystalline solid powder of the magnesium-doped lithium iron phosphate LixMg1-xFePO of preparation high conductivity

[0063] In the first step, 356 grams of iron thioninate Fe(NH4)2(SO4)2·6H2O and 115 grams of ammonium phosphate NH4H2PO4 were dissolved in 2000 grams of deionized water while stirring. Oxygen was introduced into the aqueous solution, and the temperature was raised to 95° C. for 10 hours. In oxidizing atmosphere and aqueous solution, iron thionate Fe(NH 4 ) 2 (SO 4 ) 2 ·6H 2 O and ammonium phosphate NH 4 h 2 PO 4 Reaction to form precipitate, amorphous phase FePO 4 .

[0064] In the second step, add 24 grams of lithium hydroxide to the above-mentioned semi-finished FePO aqueous solution, and keep it at a temperature of 95° C. for 3 hours. LixFePO4 in an unsaturated state is formed after chemical diffusion in the liquid. The product is washed with water to remove the remaining reactants, and finally vacuum-dried to make uns...

Embodiment 2

[0067] Example 2: Preparation of polycrystalline solid powder of non-stoichiometric lithium iron phosphate LiFePO4-y with high conductivity

[0068] In the first step, 174 grams of iron acetate (CH3COO) 2 Fe, 115 grams of ammonium phosphate NH4H2PO4 and 20 grams of carbon gel were successively added to 1000 grams of ethanol under stirring to form a sol emulsion.

[0069] In the second step, 66 grams of lithium acetate CH3COOLi are dissolved in the above-mentioned sol emulsion under stirring.

[0070] In the third step, the sol solution was transferred to an alumina ceramic crucible, and heated at 150° C. for 2 hours in a sealed furnace. Then, at 10 -2 Under low Torr vacuum, slowly heat to 500°C for 5 hours. Part of the oxygen element reacts with the carbon gel to generate CO and discharge CO2 under the condition of vacuum heating. Finally, under atmospheric conditions, the temperature was raised to 700° C. and kept for 5 hours to complete the polycrystallization reaction o...

Embodiment 3

[0072] Example 3: Preparation of supercharged magnesium-doped lithium iron manganese phosphate Li x Mg 1-x Fe z mn 1-z PO 4

[0073] The first step: 180 grams of iron thioninate Fe (NH 4 ) 2 (SO 4 ) 2·6H 2 O, 178 g Mn(NH 4 ) 2 (SO 4 ) 2 ·6H 2 O with 115 g ammonium phosphate NH 4 h 2 PO 4 Dissolve in 2000 g deionized water with stirring. Oxygen was introduced into the aqueous solution, and the temperature was raised to 95° C. for 10 hours. In oxidizing atmosphere and aqueous solution, iron thionate Fe(NH 4 ) 2 (SO 4 ) 2 ·6H 2 O, Mn(NH 4 ) 2 (SO 4 ) 2 ·6H 2 O and ammonium phosphate NH 4 h 2 PO 4 Reaction to form precipitates, amorphous phase Fe 0.5 mn 0.5 PO 4 .

[0074] In the second step, in the above-mentioned semi-finished Fe 0.5 mn 0.5 PO 4 Add 24 grams of lithium hydroxide to the mixture and keep it at 95°C for 3 hours. Li in an unsaturated state after chemical diffusion in a liquid x FePO 4 . The product is washed with water to rem...

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Abstract

The chemical general formula of the material is expressed as follows: LixM1-xFePO4, where M is selected from Mg2+, Ca2+...P5+ etc. With conduction adulterant added, reaction at 500-900 deg.C for 10 hr. by using metal oxide, phoshpate, fluoride etc. and non saturated crystal of Li-Fe phoshpate through nonstoichiometric method obtains the crystal of Li-Fe phosphate with high conductivity, which can be expressed as LiFePO4-y. The formula of material prepared by using method of pressurized type substitution ion is LixM1-xFezM'1-z. The formula of material of solid power prepared by using method of solid phase reaction is as LixM1-xFezMn1-zPO4. The formula of anode material in nano structure prepared by using method of vacuum sputter deposition is LixFePO4-y, whose conductivity and discharge capacity can reach 10 to the power -2 S / cm and 240 Ah / g.

Description

technical field [0001] The invention relates to a lithium-ion battery positive electrode material and a preparation method, which are used in polymer, colloid and liquid lithium-ion batteries, and are especially suitable for high-power power batteries. Background technique [0002] At present, the positive electrode materials commonly used in lithium batteries are three kinds of lithium intercalation oxides, which are lithium cobalt oxide (LiCoO 2 ), lithium nickel cobalt oxide (LiNi x co 1-x o 2 ) and lithium manganate (LiMn 2 o 4 ). LiCoO 2 and LiNi x co 1-x o 2 It is an oxide of hexagonal layered rock salt structure. Lithium ions Li move in the octahedral layer gap composed of O-Co-O, and have high electrical conductivity and lithium ion deintercalation / intercalation reversibility. LiMn 2 o 4 It is an oxide with a three-dimensional structure of spinel. Lithium ions Li move in the octahedral channel formed by O-Mn-O. It also has high electrical conductivity and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/02H01M4/02H01M4/04H01M4/48H01M4/58
CPCH01M4/5825Y02E60/122H01M2004/028H01M4/0471H01M4/1397H01M4/136Y02E60/10
Inventor 黄穗阳徐瑞松
Owner 徐瑞松
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