TWI234897B - A positive electrode and a lithium secondary battery using the same - Google Patents

Abstract

A positive electrode for lithium secondary battery includes active materials with bibulous materials dispersing therein. The bibulous materials sop up the water in the lithium secondary battery. A lithium secondary battery using the same positive electrode is also provided.

Description

1234897

Because of its high energy density, high electromotive force, and low-voltage characteristics, electric discharge cells have been widely used and are low-cost electronic products φ. In the consumer electronics products such as Jinjing Electric, notebook computers and the like, the lithium secondary battery of the present invention includes lithium-ion batteries. The lithium-ion batteries are made of artificial graphite or sub-clock batteries with lithium-lead, clock-recording, thorium and other metal oxides; ^ Material as secondary battery with negative, organic solvents and water as electrolyte. Ancient two-pole materials, bell-bell batteries with two types of electrodes as polymer materials, including chain-ion J-cell batteries with electricity and electrolytes as solid or colloidal polymers, and other types of lithium secondary batteries are organic Solvents or organic polymer liquids require that there are no water-containing molecules inside the battery because of lithium :: 3 ~ 4V 'and the decomposition voltage of water is 123V. If the battery Qiu Ren's ancient, water decomposition under high voltage charge and discharge will cause electricity. 3 7 knives' bell battery life. Battery performance deteriorates, reducing the relative gas content of 0.04% requires high costs, and still cannot avoid a certain amount of water molecules remaining in the process. In addition, after long-term use, lithium secondary batteries cannot avoid the penetration of moisture and gas, resulting in loss of battery functions. [Content] Therefore, it is necessary to strictly control the relative humidity of the air to be less than 0.004% (that is, Dew point = -56 ° C) in the battery manufacturing process. However, the relative humidity of the control air is less than

Page 1234897 V. Description of the invention (2) The purpose of the present invention is to provide a positive electrode that prevents the battery from deteriorating in battery performance. The inner ... lithium battery is another purpose of the present invention-to provide a lithium secondary material containing the above-mentioned positive electrode = a clock secondary battery positive electrode, the positive electrode including the positive electrode and including the manganese; ΐ: in the positive electrode active material Water-absorbing agent, positive electrode active material, bell nickel oxide, bell diamond oxide and other bells and transition gold, II. Emulsions;% water agent includes M zeolite, activated carbon, activity: = two gums; oxidation and sulfuric acid Etc., with a dew point below -56 and water-based, with particle sizes ranging from 2 nm to 10 microns. ί! J Provides a lithium secondary battery containing the above-mentioned positive electrode material. Compared with surgery, the positive electrode material provided by the present invention has the following advantages. The water agent is added to the positive electrode active material, which can retain the water remaining in the process or penetrate during use. Thereby extending the service life of the lithium secondary battery. [Embodiment] Please refer to FIG.-FIG., The lithium secondary battery positive electrode 10 of the present invention includes a current collector, a positive electrode active material 102, a water absorbent ^ 03 dispersed in a positive electrode active material towel, and a binder (not shown in the figure), The positive electrode active material ι02 and the water-absorbing agent ι03 are formed by a dead agent, and are coated on the surface of the current collector 101. Straight water absorbing agent 103 includes Zhonghua molecular sieve, activated carbon, activated oxidizing agent, dream gum, / oxygen ^, sulfuric acid! Bows, etc., have dew points below _56. 〇 Strong water absorption, grains of dried melon from 2 nanometers to 10 microns; positive active material 102 including lithium manganese oxidation

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V. Description of the invention (3) :: ΪEmulsion, lithium-cobalt oxide, and other complex oxides of lithium and transition metals U1 101 are metal substrates or carbon rods, and have good electrical conductivity; The fourth method is the preparation of the lithium secondary battery positive electrode of polyethylen, polyvinylidene, polyethlene, polyoxyethylene, and fluorene, which includes the following steps: 1 2 active material powder, water absorbent 3 and binder Mix, disperse, and disperse with a suitable dispersant (such as N-methyl? Hydrolidone) and divide it into "" The last three apply the slurry to the surface of the current collector 101 and dry it. And see-± 图 'The lithium secondary battery 20 of the present invention includes a case (Figure and :; as mentioned, + + listen to the positive electrode 10 provided by the +. And formed on :: the negative electrode of the sub-clock battery Η It mainly includes current collector stone anti-tertiary, carbon fiber or carbon nano: graphite, or other materials can also be used, such as tin and its oxides. A certain transition metal or its vaporized U liquid 12 is an organic electrolyte organic commonly used in clock ion batteries. Solvent or mixed solvent composed of several organic solvents: it can be composed of soluble lithium salt. Organic solvents such as isopropyl carbonate: Add-a kind of ethylene , Butylene carbonate, dimethyl carbonate, diammonium carbonate, carbonic acid = '12 -dimethoxyethane, etc., typical soluble dicarbonate, "Crystal Bell, ☆ Gas Filler Bell, Trimethyl Ester Lithium acid kun = polymer lithium battery 'electrolyte 12 is polymer electrolysis μ You have lithium, lithium tetrafluoroborate, hexafluorophosphoric acid — shell, such as a mouse methanesulfonic acid

Page 6 1234897 V. Description of the invention (4) Lithium, lithium hexafluoroarsenate and other lithium salts of polyethylene Take ethylene, polyvinylidene fluoride, etc. Fan, propylene oxide, and polyvinyl chloride battery isolation films 13 are films obtained in the prior art, such as inorganic paper, non-woven fabrics, and high-molecular lithium battery isolation layers and multilayer films. The porous membrane and the like include a single cell case including a metal, an alloy, and the bell secondary battery of the present invention may have any shape of a ΐ, and J 二 pillar, sheet, or button. U-shaped, such as cylindrical, prismatic The method for preparing a lithium secondary battery of the present invention can prepare a lithium secondary battery. Specifically, 3 publicly known manufacturing methods (not shown in the figure) of the method of placing the insulation through 臈 ^ include eleven, and then inject electrolyte into it and 宓 D ^ pole 10 and the negative electrode is the injection electrolyte ★, But * it is not special ;; / / Air injection as the electrodes 10, 11 dissolved in the electrolyte before being placed in the casing = can be compared with the prior art, the positive electrode material provided by the present invention: impregnation. Point. Water absorbing agent is added to the positive electrode active material " ~ There are the following water remaining in the excellent process or the water infiltrating during use ;;; = :: Zhong secondary power = stop the battery from being poisoned during use =: Cost, service life of the pool. L long lithium secondary battery In summary, the present invention has indeed been in line with the invention patent application. However, the above is only the society of the present invention. According to law: I cannot use this to limit the patent application for this case. Example 2: Shi, Yi people with the aid of the equivalent of the spirit of the present invention. This case should cover the following. Within the scope of patent application. Or .cross, both

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Claims (1)

1234897 • A positive electrode for a secondary battery, including a positive electrode active material and a water-absorbing agent dispersed in the positive electrode active material. 2. The bell secondary battery positive electrode as described in item 1 of the scope of patent application, wherein the getter includes lithiated molecular sieve, activated carbon, activated alumina, silicon gel, calcium oxide, or calcium sulfate. 3. The lithium secondary battery positive electrode according to item 1 of the patent application scope, wherein the water absorbing agent has a strong water absorption with a dew point lower than -56 ° C. 4. The positive electrode of a lithium secondary battery according to item 1 of the scope of patent application, wherein the particle size of the water absorbing agent ranges from 2 nm to 10 microns. 5. The positive electrode of a lithium secondary battery as described in item 1 of the scope of the patent application, wherein the positive 4-pole / tongue material includes a bell oxide, a bell nickel oxide, or a lithium oxide. • The positive electrode of a lithium secondary battery as described in item 1 of the scope of patent application, wherein the positive electrode further includes a current collector and a dehumidifier, and the positive electrode active material and the water absorbing agent are integrated into the current collector and coated on the current collector The surface. 7 · The positive electrode of the secondary battery as described in item 6 of the patent application scope, wherein the current collector comprises a metal substrate or a carbon rod. • The lithium secondary battery positive electrode according to item 6 of the patent application scope, wherein the binder includes polytetrafluoroethylene, polyvinylidene fluoride, polyethylene oxide, or ethylene propylene rubber. 9 · A lithium secondary battery comprising a case, a positive electrode, a negative electrode, an organic electrolyte, and a separator disposed in the case. The positive electrode includes a positive electrode active material and a water-absorbing agent dispersed in the positive electrode active material. • The lithium secondary battery as described in item 9 of the patent claim, wherein the water absorbing agent 1234897 ^ --- y, apply for patent scope ----------------- Including Zhonghuafen JfL calcium or calcium sulfate. , Activated carbon, activated alumina, silicone, oxidized among them water absorbing agent among them water absorbing agent dance or sulfuric acid dance. 11 · Lithium secondary battery as described in item 9 of the patent application + taxi + younger brother 12. Strong water absorption of two points below ~ 56 ^. Grain = Bell Secondary Battery as described in Item 9 of Lee Fan Garden. 1 d • The lithium secondary battery described in item 9 of the scope of patent application, and also ~ Guogudi, wherein the negative electrode of the lithium secondary battery includes a current collector and a negative electrode substance formed on the surface of the current collector. . The secondary battery ′ described in the Ninth Ming Patent No. 9 wherein the negative active material of the li 2 ′ includes a carbon material or a transition metal or a transition i-type oxide. 15 If φ is too large = = ^ Please refer to the lithium secondary battery described in item 9 of the patent scope, wherein the lithium secondary battery is 酽. The electrolyte solvents include isopropenyl carbonate, ethylene carbonate I, butylene carbonate, dimethyl carbonate, diethyl acid, methyl carbonate, 1-9-1 · 6. Rushen to Kuidi Γ methoxy Ethane or the group it comprises. The lithium secondary battery described in the sub-Lei Ming patent No. 9 item, wherein the electrolyte solute of the lithium two = two cells includes lithium perchlorate, lithium tetrafluoroborate, six gas phase,-1 7 * Lithium dimethionate, lithium hexafluoroarsenate. 3 The lithium secondary battery according to item 9 of the Mingli range, wherein the lithium secondary =. The electrolytic solution of the cell is a polymer electrolyte, including polyethylene oxide fired and polymerized with one or more soluble lithium salts in one or more of lithium hexafluoromonophosphate, lithium hexafluorophosphate, trifluoromethanesulfonic acid, and hexafluorocarbon. Acryloxane, polyvinyl chloride or polyvinylidene fluoride. Page 10 1234897 Page 11