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Positive electrode material, positive electrode comprising same, and electrochemical device comprising positive electrode material

A positive electrode material and coating technology, applied in electrochemical generators, positive electrodes, inorganic chemistry, etc., can solve the problems of easily broken particles, limited application, high bulk density, etc., to reduce side reactions and achieve excellent structural stability. Effect

Active Publication Date: 2019-11-05
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

High-nickel materials (nickel content accounts for more than 50% of all transition metal elements) have attracted extensive attention because of their lower cobalt content and higher actual specific capacity than lithium cobalt oxide. However, the bulk density of high-nickel materials Large and its particles are easily broken under high compaction density, thus limiting its application in high energy density batteries

Method used

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  • Positive electrode material, positive electrode comprising same, and electrochemical device comprising positive electrode material
  • Positive electrode material, positive electrode comprising same, and electrochemical device comprising positive electrode material
  • Positive electrode material, positive electrode comprising same, and electrochemical device comprising positive electrode material

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preparation example Construction

[0055] Preparation method of cathode material

[0056] According to some embodiments of the present application, the cathode material may be prepared by forming first particles, forming second particles, and uniformly mixing the first particles and the second particles.

[0057] Forming the first particle: mix the first precursor, lithium (Li) source, and the first doping element according to the stoichiometric ratio of the first lithium-containing transition metal oxide and dry them. The calcining is carried out once for about 14h to about 18h to form the first particles composed of the third particles.

[0058] Forming the second particle: mix the second precursor, lithium source, and the second doping element uniformly according to the stoichiometric ratio of the second lithium-containing transition metal oxide and dry it once at about 820°C to about 880°C after drying. Calcining for about 14 hours to about 18 hours to form second particles consisting of fourth particles. ...

Embodiment 1

[0087] According to LiNi 0.84 co 0.08 mn 0.05 Mg 0.03 o 2 (First transition metal oxide) stoichiometric ratio Prepare the first NCM precursor, lithium hydroxide (LiOH) and nano-magnesium oxide (MgO) with a Dv50 of 9 μm, and mix them uniformly and dry them, and after drying, heat them at 800 °C Calcination was carried out once for 16 hours at the same time to obtain the first particles (Dv50 of 11.5 μm) composed of the third particles (Dv50 of 0.6 μm). Then, the first particles were mixed with aluminum hydroxide (Al(OH) 3 ) after being evenly mixed, pre-coated at 600° C. for 6 hours by secondary calcination, and the molar percentage of aluminum was 0.3%; then the first particle after pre-coating was mixed with boric acid (H 3 BO 3 ) mixed evenly, and sintered at 400° C. for 4 hours to carry out boron coating, the mole percentage of boron is 0.3%, and finally the coated first particle is obtained.

[0088] According to LiNi 0.85 co 0.08 mn 0.05 Mg 0.02 o 2 (The stoic...

Embodiment 2- Embodiment 4

[0096] The preparation method of Example 2-Example 4 is the same as that of Example 1, except that the mass ratio of the first particle to the second particle is different, and the specific mass ratio is shown in Table 1 below.

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Abstract

The invention relates to a positive electrode material, a positive electrode comprising the same, and an electrochemical device comprising the positive electrode material. The positive electrode material includes first particles, wherein the first particles include secondary particles composed of third particles, and the third particles are primary particles; the first particles have an average particle diameter of 5 [mu]m to 20 [mu]m, and the average particle size of the third particles is 200 nm to 700 nm; the first particles comprise first lithium-containing transition metal oxide. The positive electrode material also comprises second particles, wherein the second particles comprise fourth particles and / or secondary particles composed of the fourth particles; the fourth particles are primary particles, wherein the average particle size of the second particles is 3 [mu]m to 5 [mu]m, and the average particle size of the fourth particles is 800 nm to 5 [mu]m; and the second particles comprise second lithium-containing transition metal oxide. The electrochemical device comprising the positive electrode material is significantly improved in terms of energy density, capacity attenuation, and service life.

Description

technical field [0001] The present application relates to the technical field of energy storage, in particular to positive electrode materials and positive electrodes and electrochemical devices including the same. Background technique [0002] With the rapid development of mobile electronic technology, the frequency and experience requirements of people using mobile electronic devices such as mobile phones, tablets, notebook computers, and drones are getting higher and higher. In order to balance function and appearance, secondary batteries that power mobile electronic devices need to exhibit higher energy density and less capacity fading after repeated charge-discharge processes. [0003] At present, most secondary batteries use lithium cobalt oxide as the positive electrode material, but cobalt is a highly toxic, high-cost and resource-limited element, so the development of low-cobalt materials is an inevitable trend. High-nickel materials (nickel content accounts for mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M4/131H01M10/0525
CPCH01M4/366H01M4/485H01M4/505H01M4/525H01M4/131H01M10/0525Y02E60/10H01M2004/028H01M4/364H01M4/62H01M4/1391H01M10/052C01G53/50C01G53/42C01P2002/52C01P2002/74C01P2004/03C01P2004/32C01P2004/51C01P2004/61C01P2004/62C01P2004/50C01P2004/84C01P2006/12H01M2004/021
Inventor 刘文元彭刚郎野徐磊敏
Owner NINGDE AMPEREX TECH
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