摘要:
A rechargeable electrochemical device composed of a negative electrode (4) which comprises an alkali metal as an active material, a non-aqueous electrolyte (6), and a positive electrode (1). The positive electrode (1) is composed of an oxide of chromium and vanadium represented by the general formula:Cr.sub.x V.sub.2(1-x) O.sub.5-(2+y)x(wherein 0.2.ltoreq.x.ltoreq.0.9, 0.1.ltoreq.y.ltoreq.1.0). The rechargeable electrochemical device offers a high discharge voltage, a large discharge capacity, linear discharge voltage, and the capacity to withstand over-charging.
摘要:
A rechargeable negative electrode for an electrochemical apparatus using nonaqueous electrolytes, said electrode comprising an alloy comprising (1) at least one metal selected from the group consisting of Sn, Pn, In and Bi and (2) Zn or Zn and Cd, as well as a rechargeable electrochemical apparatus comprising a combination of said negative electrode with a positive electrode having reversibility in charging and discharging. The above-mentioned negative electrode reversibly absorbs and desorbs alkali metal ions, as the result of charge and discharge, in nonaqueous electrolyte containing alkali metal ions. It undergoes no pulverization even after repeated charge and discharge, and maintains its shape stably, so that it has a long charge-and-discharge cycle life. Further, since it can absorb a large quantity of alkali metal per unit volume, it is of high energy density.
摘要:
An alloy capable of reversibly absorbing and desorbing lithium ions in a non-aqueous electrolyte containing lithium ions on charging and discharging has excellent applicability to anode for rechargeable electrochemical devices. However, such alloy, when absorbed with lithium, loses its flexibility, so that when it is incorporated in a device in a charged state, it is subject to trouble such as cracking and can not display its properties. This invention adopts a method in which anode alloy is combined with lithium by connecting them so as to be electronically conductive to each other and this combination is fitted into the device, and then the electrolyte is supplied into the device to have lithium absorbed in anode alloy in the device. According to this method, cracking of cathode can be prevented.
摘要:
The present invention relates to a rechargeable negative electrode for an electrochemical apparatus using nonaqueous electrolyte, said electrode comprising an alloy comprising Cd and at least one metal selected from the group consisting of Sn, Pb, In and Bi, as well as to a rechargeable electrochemical apparatus comprising a combination of said negative electrode with a positive electrode having reversibility in charge and discharge.The above-mentioned negative electrode reversibly absorbs and desorbs alkali metal ions, as the result of charge and discharge, in nonaqueous electrolyte containing alkali metal ions. It undergoes no pulverization even after repeated charge and discharge and maintains its shape stably, so that it has a long chargeand-discharge life. Further, since it can absorb a large quantity of alkali metal per unit volume, it is of high energy density.
摘要:
A non-aqueous electrolyte secondary battery using lithium containing composite oxide, which intercalates and de-intercalates lithium, for a positive electrode; and lithium containing composite nitride and a compound having a large irreversible capacity for a negative electrode. Metal oxide is used as a material for the negative electrode, and lithium containing composite nitride represented by the general formula of Li3−xMxN (M is a transition metal, 0.2
摘要翻译:一种使用含锂复合氧化物的非水电解质二次电池,其对于正极插入和除去锂; 和含锂复合氮化物和负极的不可逆容量大的化合物。 金属氧化物用作负极材料,负极中也含有由通式Li 3-x M x N(M为过渡金属,0.2
摘要:
A non-aqueous electrolyte secondary cell disclosed comprises a positive electrode sheet with a lithium-containing metal oxide as major positive electrode active material, a negative electrode sheet with graphitic particles as major negative electrode coating agent, a separator and a non-aqueous electrolyte, wherein the negative electrode sheet is produced by mixing the major graphitic particles, a binder and the like to produce a paste, coating the paste on both sides of a collector, pressing the coated collector, the coating layer having a porosity of 25% to 40%, and the graphitic particles have an average particle size of 3 .mu.m to 25 .mu.m which are produced by heat-treating a pitch in the molten state to produce carbonaceous mesophase particles, extracting the mesophase particles, carbonizing the mesophase particles and then heat-treating the carbonized particles through graphitization at 2500.degree. C. to 2900.degree. C. and which have a lattice plane spacing (d002) of 3.36 .ANG. to 3.39 .ANG., a crystal size in the direction of the C axis (Lc) of 200 .ANG. to 650 .ANG., as determined by X-ray diffraction analysis, and a ratio in intensity of the peak at 1360 cm.sup.-1 to that at 1580 cm.sup.-1 of 0.20 to 0.40 as determined by Argon laser-Raman spectrometry.
摘要:
A method for producing a cathode active material for a non-aqueous electrolyte secondary battery, which comprises the step of heating a mixture of .beta.-Ni(OH).sub.2 and a lithium salt in the presence of oxygen at a temperature ranging from 600.degree. C. to 800.degree. C. to obtain LiNiO.sub.2.
摘要:
100 parts by weight of a carbon material having irreversible capacity and 20 to 150 parts by weight of a lithium-containing complex nitride represented by the general formula Li3-XMXN wherein M is at least one selected from the group consisting of Co, Ni, Mn and Cu, and wherein 0.2≦X≦0.8, are included in a negative electrode thereby to compensate for the irreversible capacity of the carbon material by the above-described nitride. This enables the maximum utilization of large capacity possessed by an amorphous carbon or low crystalline carbon, thereby making it possible to provide a non-aqueous electrolyte secondary battery having high capacity and excellent cycle reversibility.
摘要翻译:100重量份具有不可逆容量的碳材料和20至150重量份由通式Li 3 -XMX N表示的含锂复合氮化物,其中M是选自Co,Ni,Mn中的至少一种 和Cu,并且其中0.2 <= X <= 0.8,被包括在负极中,由此补偿上述氮化物对碳材料的不可逆容量。 由此能够最大限度地利用由无定形碳或低结晶碳所具有的大容量,从而可以提供具有高容量和优异的循环可逆性的非水电解质二次电池。
摘要:
A process for manufacturing lithium containing oxides represented by a formula LiNi.sub.x Co.sub.(1-x) O.sub.2, or a formula LiNi.sub.x Mn.sub.(1-x) O.sub.2, having almost single phase, through completely replacing a part of the Ni with Co or Mn. The single phase structure has the advantage that Li mobility in the crystal is high, the positive active materials having almost single phase show a large capacity and excellent cycle characteristics. According to the method, the positive active materials of lithium containing oxides are prepared by burning lithium compounds and composite hydroxides comprising Ni and Co, or Ni and Mn. The composite hydroxides are obtained through co-precipitation of nickel and cobalt hydroxides, or nickel and manganese hydroxides by adding caustic alkali aqueous solutions to mixed solutions containing nickel and cobalt salts or nickel and manganese salts.
摘要:
A non-aqueous electrolyte secondary battery, comprises positive and negative electrode plates, each comprising a current collector and a material mixture layer carried on each face thereof. A total thickness of the positive electrode material mixture layers on both faces of the current collector is 40 μm to 100 μm. The positive electrode plate has an electrode area of 520 cm2 to 800 cm2 per battery capacity of 1 Ah. The negative electrode material mixture layer comprises a graphitizable carbon material. A wide-range X-ray diffraction pattern of the graphitizable carbon material has a peak PX (101) attributed to a (101) crystal face at about 2θ=44 degrees, and a peak PX (100) attributed to a (100) crystal face at about 2θ=42 degrees. A ratio of an intensity IX (101) of PX (101) to an intensity IX (100) of PX(100) satisfies: 0