Lithium-rich manganese-based anode material and preparation method thereof

A positive electrode material, lithium-rich manganese-based technology, applied in the direction of battery electrodes, electrical components, circuits, etc., can solve the problems of poor cycle stability, material performance that does not meet the requirements of practical applications, and poor material rate performance. Stable performance, excellent rate cycle performance, and good thermal stability

Inactive Publication Date: 2010-04-14
JIANGXI JIANGTE LITHIUM LON BATTERY MATERIAL +1
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Problems solved by technology

Li[Li (1-2x)/3 Ni x mn (2-x)/3 ]O 2 The material is Li 2 MnO 3 with LiMn 0.5 Ni 0.5 o 2 The solid solution is a composite structure, which has a high specific capacity at a higher charging voltage. It has been reported in the literature that Li 1.2 Ni 0.2 mn 0.6 o 2 The initial discharge specific capacity of the material is 288mAh/g when charged and discharged at 2-4.8V with a current of 20mA/g, but its cycle stability is very poor, and the discharge specific capacity drops to 213mAh/g after 30 cycles
From the reported Li[Li (1-2x)/3 Ni x mn (2-x)/3 ]O 2 From the perspective of materials, there are obvious defects. First, the Li [Li (1-2x)/3 Ni x mn (2-x)/3 ]O 2 The high specific capacity of the materi

Method used

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  • Lithium-rich manganese-based anode material and preparation method thereof
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  • Lithium-rich manganese-based anode material and preparation method thereof

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[0043] Lithium-rich manganese-based cathode material Li[Li] provided by the present invention (1-2x) / 3 Ni x-a m y mn (2-x) / 3-b ]O 2 (M=Co, Al, Ti, Mg, Cu) preparation method comprises the following steps:

[0044] a. soluble nickel, manganese, M salt are dissolved in deionized water in a molar ratio of (x-a): [(2-x) / 3-b]: y, and the total concentration is prepared into a solution of 0.5~4mol / L, Wherein, 0

[0045] b. Prepare an alkali solution or a mixed solution of alkali and ammonia water, the alkali concentration is 1-8mol / L, and the molar concentration of ammonia water is 0.1-4mol / L;

[0046] c. add a certain amount of deionized water in the reactor, pump the nickel, manganese, M salt solution into the reactor, and pump the alkali solution into the reactor simultaneously, Stir the materials, control the temperature and pH value in the reactor, and form precursor...

Embodiment 1

[0051]The molar percentage of nickel, manganese and aluminum metal ions is 0.123:0.850:0.027. Dissolve nickel sulfate, manganese sulfate and aluminum sulfate in deionized water to prepare a uniform and transparent solution with a total concentration of manganese, nickel and aluminum ions of 2mol / L , prepare a 4mol / L sodium hydroxide solution, pump the mixed metal salt solution and the sodium hydroxide solution into the reactor at the same time for co-precipitation reaction. The precipitated product was filtered, washed, and dried to obtain the metal hydroxide precursor Mn 0.85 Ni 0.123 Al 0.027 (OH) 2 .

[0052] The precursor and lithium carbonate are uniformly mixed according to the ratio of the molar number of lithium to the total molar number of nickel, manganese, and aluminum of 1.77:1, and the uniformly mixed powder is compacted and kept at 450°C for 2 hours. Then the temperature was raised to 800°C for 40 hours to obtain the lithium-rich manganese-based material Li[L...

Embodiment 2

[0055] With the molar percentage of nickel, manganese, and aluminum metal ions as 0.238:0738:0.025, nickel chloride, manganese sulfate, and aluminum chloride are dissolved in deionized water, and the total concentration of manganese, nickel, and aluminum ions is 2mol / L. Uniform and transparent solution, prepare 4mol / L sodium hydroxide solution, pump the mixed metal salt solution and sodium hydroxide solution into the reactor at the same time for co-precipitation reaction. The precipitated product was filtered, washed, and dried to obtain the metal hydroxide precursor Mn 0.738 Ni 0.238 Al 0.025 (OH) 2 .

[0056] The precursor and lithium carbonate are uniformly mixed according to the ratio of the molar number of lithium to the total molar number of nickel, manganese, and aluminum of 1.54:1, and the uniformly mixed powder is compacted and kept at 550°C for 4 hours. Then the temperature was raised to 900°C for 20 hours to obtain the lithium-rich manganese-based material Li[Li...

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Abstract

The invention relates to a lithium-ion secondary battery anode material technology, in particular to a lithium-rich manganese-based anode material Li(Li(1-2x)/3Nix-aMyMn(2-x)/3-b)O2 (M is Co, Al, Ti, Mg and Cu) and a preparation method thereof. A general formula of the lithium-rich manganese-based anode material is as follows: Li(Li(1-2x)/3Nix-aMyMn(2-x)/3-b)O2 (M is Co, Al, Ti, Mg and Cu), wherein x is more than 0 and less than or equal to 0.5, when M is Co and Al, y is more than 0 and less than 2x, a is equal to b, and b is equal to y/2; when M is Ti, y is more than 0 and less than (2-x)/3, a is equal to 0, and b is equal to y; and when M is Mg and Cu, y is more than 0 and less than x, a is equal to y, and b is equal to 0. The invention has high specific discharge capacity, excellent normal temperature and high temperature cycle performance, good safety, low raw material cost and production cost, and very high cost-performance ratio.

Description

technical field [0001] The present invention relates to lithium-ion secondary battery anode material technology, particularly lithium-rich manganese-based anode material Li[Li (1-2x) / 3 Ni x-a m y mn (2-x) / 3-b ]O 2 (M=Co, Al, Ti, Mg, Cu) and its preparation method. Background technique [0002] Lithium-ion battery cathode material is the key raw material 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 cathode materials on the market are mainly lithium cobalt oxide. , materials such as spinel lithium manganate, nickel cobalt lithium manganese oxide, nickel cobalt lithium oxide, and lithium iron phosphate also occupy a certain market share. Lithium cobaltate is the first positive electrode material to be commercialized. It has stable performance, simple preparation, and mature technology. However, the global cobalt resources are in short supply, and my...

Claims

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Application Information

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IPC IPC(8): H01M4/48H01M4/505H01M4/525H01M4/1391
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 钟盛文胡伟张骞
Owner JIANGXI JIANGTE LITHIUM LON BATTERY MATERIAL
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