AQUEOUS ELECTROLYTE BIPOLAR SECONDARY BATTERY, BATTERY PACK, VEHICLE AND STATIONARY POWER SOURCE

• Main Authors: MATSUNO SHINSUKE, KYUSEKI HIROSHI, HOTTA YASUYUKI, KUBOKI TAKASHI
• Format: Patent
• Language: English; Japanese
• Published: 03.10.2022
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

To provide an aqueous electrolyte battery superior in life characteristic, and including a bipolar electrode having a current collector that exhibits high endurance.SOLUTION: Provided is an aqueous electrolyte bipolar secondary battery 500. The aqueous electrolyte bipolar secondary battery 500 comprises: an anode 3; a cathode 5; a bipolar electrode having a bipolar electrode collector 502; and an aqueous electrolyte. The bipolar electrode collector 502 has a metal layer a 502a and a metal layer b 502b. The metal layer a contains at least one element selected from a group consisting of Cr, Ni, Fe, Ti and Al. The metal layer b contains either Zn or Sn, which is 10 wt% or more and 100 wt% or less to a weight per unit layer of the metal layer b. The metal layer a and the metal layer b are electrically connected. The bipolar electrode has a cathode active material-containing layer 5b2 on a face of the metal layer a, and an anode active material-containing layer 3b2 on a face of the metal layer b.SELECTED DRAWING: Figure 1 【課題】高い耐久性を示す集電体を有するバイポーラ電極を備える、優れた寿命特性を持つ水系電解質電池を提供する。【解決手段】水系電解質バイポーラ二次電池５００が提供される。この水系電解質バイポーラ二次電池５００は負極３と、正極５と、バイポーラ電極集電体５０２を備えるバイポーラ電極と、水系電解質を具備する。バイポーラ電極集電体５０２は、金属層ａ５０２ａと金属層ｂ５０２ｂを有し、金属層ａは、Ｃｒ、Ｎｉ、Ｆｅ、Ｔｉ、Ａｌからなる群より選択される少なくとも１種の元素を含み、金属層ｂは、金属層ｂの１層当たりの重量に対して１０ｗｔ．%以上１００ｗｔ．％以下のＺｎ及びＳｎのいずれか１種の元素を含む。金属層ａ及び金属層ｂは電気的に接続されており、金属層ａの面上に正極活物質含有層５ｂ２を有し、金属層ｂの面上に負極活物質含有層３ｂ２を有する。【選択図】図１